:root {
  --navy-950: #071426;
  --navy-900: #0b1d35;
  --navy-800: #123254;
  --blue-600: #1769e0;
  --blue-500: #2584ff;
  --cyan-400: #47d7e8;
  --ink-900: #10233f;
  --ink-600: #52657d;
  --line: #dce5f0;
  --surface: #ffffff;
  --surface-soft: #f4f7fb;
  --success: #0f9f6e;
  --danger: #d63a4a;
  --shadow: 0 22px 60px rgba(14, 39, 72, 0.12);
  --radius-lg: 26px;
  --radius-md: 18px;
  color-scheme: light;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink-900); background: var(--surface-soft); line-height: 1.65; }
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid rgba(37, 132, 255, .38); outline-offset: 3px; }
.skip-link { position: fixed; left: 20px; top: -80px; z-index: 100; padding: 10px 16px; border-radius: 10px; color: #fff; background: var(--navy-950); }
.skip-link:focus { top: 16px; }

.site-header { position: sticky; top: 0; z-index: 50; display: flex; align-items: center; justify-content: space-between; min-height: 74px; padding: 0 max(28px, calc((100vw - 1180px) / 2)); border-bottom: 1px solid rgba(220,229,240,.85); background: rgba(255,255,255,.92); backdrop-filter: blur(18px); }
.brand { display: inline-flex; align-items: center; gap: 11px; font-weight: 800; letter-spacing: -.02em; }
.brand-logo { display: block; width: 44px; height: 44px; object-fit: contain; }
.brand-mark { display: grid; place-items: center; width: 44px; height: 34px; border-radius: 10px; color: #fff; background: linear-gradient(135deg, var(--blue-600), var(--cyan-400)); box-shadow: 0 8px 22px rgba(23,105,224,.24); font-size: .83rem; }
.main-nav { display: flex; align-items: center; gap: clamp(10px, 1.2vw, 18px); color: #334b67; font-size: .86rem; font-weight: 700; }
.nav-item, .nav-item-label, .nav-logout button { display: inline-flex; align-items: center; gap: 7px; white-space: nowrap; }
.nav-item-icon { display: block; flex: 0 0 auto; width: 20px; height: 20px; object-fit: contain; }
.main-nav a:hover, .nav-resource-menu > summary:hover { color: var(--blue-600); }
.main-nav .nav-login { padding: 9px 13px; border-radius: 11px; color: #fff; background: var(--navy-900); }
.main-nav .nav-login:hover { color: #fff; background: var(--blue-600); }
.nav-resource-menu { position: relative; }
.nav-resource-menu summary { display: flex; align-items: center; gap: 8px; cursor: pointer; list-style: none; }
.nav-resource-menu summary::-webkit-details-marker { display: none; }
.nav-resource-menu[open] summary { color: var(--blue-600); }
.nav-resource-chevron { width: 8px; height: 8px; border-right: 2px solid var(--blue-600); border-bottom: 2px solid var(--blue-600); transform: translateY(-2px) rotate(45deg); transition: transform .2s ease; }
.nav-resource-menu[open] .nav-resource-chevron { transform: translateY(2px) rotate(225deg); }
.nav-resource-panel { position: absolute; left: 50%; top: calc(100% + 20px); z-index: 60; display: grid; gap: 10px; width: 430px; padding: 12px; border: 1px solid rgba(185,202,222,.86); border-radius: 22px; background: rgba(255,255,255,.98); box-shadow: 0 28px 70px rgba(7,20,38,.2); transform: translateX(-50%); animation: nav-resource-in .18s ease both; }
.nav-resource-panel::before { content: ""; position: absolute; left: 50%; top: -7px; width: 14px; height: 14px; border-top: 1px solid rgba(185,202,222,.86); border-left: 1px solid rgba(185,202,222,.86); background: #fff; transform: translateX(-50%) rotate(45deg); }
.nav-resource-intro { display: grid; gap: 4px; padding: 17px 18px; border-radius: 15px; color: #fff; background: radial-gradient(circle at 86% 12%, rgba(71,215,232,.22), transparent 32%), linear-gradient(135deg, var(--navy-950), #123b67); }
.nav-resource-intro span { color: var(--cyan-400); font-size: .7rem; font-weight: 850; letter-spacing: .12em; }
.nav-resource-intro strong { font-size: 1rem; }
.nav-resource-intro small { color: #b9c9db; font-size: .78rem; font-weight: 500; }
.nav-resource-links { display: grid; gap: 5px; }
.nav-resource-links > a { display: grid; grid-template-columns: 46px minmax(0, 1fr) 20px; gap: 12px; align-items: center; padding: 12px; border: 1px solid transparent; border-radius: 14px; transition: border-color .18s ease, background .18s ease, transform .18s ease; }
.nav-resource-links > a:hover, .nav-resource-links > a:focus-visible { border-color: #c9d9ec; color: var(--ink-900); background: #f5f8fc; transform: translateX(2px); }
.nav-resource-links > a > span:nth-child(2) { display: grid; min-width: 0; }
.nav-resource-links strong { font-size: .9rem; }
.nav-resource-links small { overflow: hidden; color: var(--ink-600); font-size: .73rem; font-weight: 500; text-overflow: ellipsis; white-space: nowrap; }
.nav-resource-icon { display: grid; place-items: center; width: 46px; height: 42px; border-radius: 12px; font-size: .72rem; font-weight: 900; }
.nav-resource-icon-ai { color: #075a68; background: linear-gradient(135deg, #d9fbff, #bfeef5); }
.nav-resource-icon-cpp { color: #fff; background: linear-gradient(135deg, var(--blue-600), #37b9df); }
.nav-resource-arrow { color: var(--blue-600); font-size: 1.1rem; }
.nav-resource-more { display: flex; justify-content: space-between; padding: 10px 13px; border-top: 1px solid var(--line); color: var(--blue-600); font-size: .78rem; font-weight: 800; }
.nav-toggle { display: none; align-items: center; gap: 9px; min-height: 42px; padding: 0 11px; border: 1px solid var(--line); border-radius: 11px; color: var(--ink-900); background: #fff; font-weight: 750; }
.nav-toggle-icon { display: grid; gap: 3px; width: 17px; }
.nav-toggle-icon span { display: block; height: 2px; border-radius: 3px; background: currentColor; transition: transform .2s ease, opacity .2s ease; }
.nav-toggle[aria-expanded="true"] .nav-toggle-icon span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-icon span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-icon span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }
@keyframes nav-resource-in { from { opacity: 0; transform: translate(-50%, -7px); } to { opacity: 1; transform: translate(-50%, 0); } }

.hero-section { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(360px, .85fr); gap: 64px; align-items: center; min-height: 660px; padding: 88px max(28px, calc((100vw - 1180px) / 2)); overflow: hidden; color: #fff; background: radial-gradient(circle at 78% 18%, rgba(71,215,232,.18), transparent 26%), radial-gradient(circle at 15% 75%, rgba(37,132,255,.18), transparent 28%), var(--navy-950); }
.hero-copy { max-width: 700px; }
.eyebrow { display: inline-block; margin-bottom: 15px; color: var(--blue-600); font-size: .78rem; font-weight: 850; letter-spacing: .14em; text-transform: uppercase; }
.hero-copy .eyebrow { color: var(--cyan-400); }
.hero-copy h1 { max-width: 680px; margin: 0; font-size: clamp(2.6rem, 5vw, 5rem); line-height: 1.08; letter-spacing: -.055em; }
.hero-copy > p { max-width: 620px; margin: 24px 0 0; color: #b9c9db; font-size: 1.08rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 21px; border: 1px solid transparent; border-radius: 13px; font-weight: 800; cursor: pointer; }
.button-primary { color: #fff; background: linear-gradient(135deg, var(--blue-600), var(--blue-500)); box-shadow: 0 12px 26px rgba(37,132,255,.27); }
.button-secondary { color: #e6f0fb; border-color: rgba(255,255,255,.22); background: rgba(255,255,255,.06); }
.button-light { color: var(--navy-900); background: #fff; }
.hero-points { display: flex; flex-wrap: wrap; gap: 22px; margin: 31px 0 0; padding: 0; color: #8fa6c0; list-style: none; font-size: .88rem; }
.hero-points li::before { content: "✓"; margin-right: 8px; color: var(--cyan-400); font-weight: 900; }
.hero-panel { position: relative; padding: 32px; border: 1px solid rgba(255,255,255,.13); border-radius: 30px; background: linear-gradient(145deg, rgba(255,255,255,.1), rgba(255,255,255,.035)); box-shadow: 0 36px 80px rgba(0,0,0,.24); backdrop-filter: blur(18px); }
.path-step { display: flex; align-items: center; gap: 16px; padding: 19px; border-radius: 17px; background: rgba(255,255,255,.08); }
.path-step > span { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 14px; color: var(--cyan-400); background: rgba(71,215,232,.12); font-weight: 900; }
.path-step div { display: grid; gap: 2px; }
.path-step small { color: #91a8c1; }
.path-step-featured { border: 1px solid rgba(71,215,232,.24); background: rgba(37,132,255,.12); }
.path-line { width: 2px; height: 32px; margin-left: 41px; background: linear-gradient(var(--cyan-400), var(--blue-500)); opacity: .55; }
.hero-code { margin-top: 24px; padding: 17px 19px; border-radius: 14px; color: #95eff7; background: rgba(3,11,24,.72); font: 700 .92rem/1.5 Consolas, monospace; }

.section-shell { max-width: 1180px; margin: 0 auto; padding: 92px 28px; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 40px; margin-bottom: 34px; }
.section-heading h2, .manual-banner h2 { margin: 0; font-size: clamp(1.85rem, 3vw, 2.8rem); line-height: 1.18; letter-spacing: -.04em; }
.section-heading > p { max-width: 470px; margin: 0; color: var(--ink-600); }
.course-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; }
.course-card { display: flex; min-height: 330px; overflow: hidden; flex-direction: column; padding: 32px; border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface); box-shadow: 0 14px 42px rgba(14,39,72,.07); }
.course-card-dark { color: #fff; border-color: transparent; background: linear-gradient(145deg, var(--navy-900), #163e68); box-shadow: var(--shadow); }
.course-card-cover { aspect-ratio: 3 / 2; overflow: hidden; margin: -32px -32px 27px; background: var(--navy-900); }
.course-card-cover img, .catalog-card-cover img, .course-cover-hero img, .member-course-overview > img { display: block; width: 100%; height: 100%; object-fit: cover; }
.card-topline { display: flex; justify-content: space-between; gap: 16px; color: var(--blue-600); font-size: .79rem; font-weight: 850; letter-spacing: .08em; }
.course-card-dark .card-topline { color: var(--cyan-400); }
.status-dot::before { content: ""; display: inline-block; width: 7px; height: 7px; margin-right: 7px; border-radius: 50%; background: var(--success); }
.course-card h3 { margin: 28px 0 13px; font-size: 1.8rem; letter-spacing: -.035em; }
.course-card p { margin: 0; color: var(--ink-600); }
.course-card-dark p { color: #b7c7d9; }
.card-footer { display: flex; align-items: center; justify-content: space-between; gap: 18px; margin-top: auto; padding-top: 30px; border-top: 1px solid var(--line); color: var(--ink-600); font-size: .9rem; }
.course-card-dark .card-footer { border-color: rgba(255,255,255,.12); color: #a9bad0; }
.card-footer a { color: var(--blue-600); font-weight: 850; }
.course-card-dark .card-footer a { color: var(--cyan-400); }
.section-action { display: flex; justify-content: center; margin-top: 34px; }
.catalog-hero { color: #fff; background: radial-gradient(circle at 75% 20%, rgba(71,215,232,.2), transparent 28%), radial-gradient(circle at 20% 80%, rgba(37,132,255,.18), transparent 30%), var(--navy-950); }
.catalog-hero .section-shell { padding-block: 80px; }
.catalog-hero h1 { max-width: 760px; margin: 0; font-size: clamp(2.7rem, 5.5vw, 5.3rem); line-height: 1.05; letter-spacing: -.06em; }
.catalog-hero p { max-width: 720px; margin: 22px 0 0; color: #b9c9db; font-size: 1.05rem; }
.catalog-stats { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }
.catalog-stats span { display: inline-flex; align-items: baseline; gap: 8px; padding: 10px 15px; border: 1px solid rgba(255,255,255,.14); border-radius: 999px; color: #adc1d5; background: rgba(255,255,255,.06); }
.catalog-stats strong { color: var(--cyan-400); font-size: 1.18rem; }
.catalog-shell { padding-top: 76px; }
.catalog-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.catalog-card { display: flex; min-height: 310px; overflow: hidden; flex-direction: column; padding: 25px; border: 1px solid var(--line); border-radius: 21px; background: #fff; box-shadow: 0 12px 34px rgba(14,39,72,.06); transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease; }
.catalog-card:hover { border-color: #a9cdf6; box-shadow: 0 20px 48px rgba(14,39,72,.12); transform: translateY(-3px); }
.catalog-card.is-unlocked { border-color: #9fd8c4; background: linear-gradient(180deg, #f8fffc, #fff 42%); }
.catalog-card-cover { display: block; aspect-ratio: 3 / 2; overflow: hidden; margin: -25px -25px 22px; background: var(--navy-900); }
.catalog-card-top { display: flex; align-items: center; justify-content: space-between; gap: 16px; color: var(--blue-600); font-size: .76rem; font-weight: 850; }
.catalog-card-top > span { display: grid; place-items: center; width: 38px; height: 38px; border-radius: 11px; background: #eaf4ff; }
.catalog-card-top em { color: #667b93; font-style: normal; }
.catalog-card h2 { margin: 24px 0 12px; font-size: 1.3rem; line-height: 1.38; letter-spacing: -.025em; }
.catalog-card p { margin: 0; color: var(--ink-600); font-size: .9rem; }
.catalog-card-footer { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-top: auto; padding-top: 24px; border-top: 1px solid var(--line); color: #74869b; font-size: .78rem; }
.catalog-card-footer strong { color: var(--blue-600); }
.manual-banner { display: flex; align-items: center; justify-content: space-between; gap: 32px; max-width: 1180px; margin: 10px auto; padding: 46px 52px; border-radius: 30px; color: #fff; background: radial-gradient(circle at 80%, rgba(71,215,232,.24), transparent 34%), linear-gradient(120deg, #0c3159, #1769e0); box-shadow: var(--shadow); }
.manual-banner p { margin: 10px 0 0; color: #d1e2f6; }
.eyebrow-light { color: #95eff7; }
.resource-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.resource-card { display: flex; min-height: 270px; flex-direction: column; padding: 25px; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--surface); transition: transform .2s ease, box-shadow .2s ease; }
.resource-card:hover { transform: translateY(-4px); box-shadow: 0 18px 42px rgba(14,39,72,.1); }
.resource-card > span { color: var(--blue-600); font-size: .75rem; font-weight: 850; letter-spacing: .09em; }
.resource-card h3 { margin: 24px 0 10px; font-size: 1.17rem; line-height: 1.4; }
.resource-card p { margin: 0; color: var(--ink-600); font-size: .92rem; display: -webkit-box; overflow: hidden; -webkit-line-clamp: 3; -webkit-box-orient: vertical; }
.resource-card strong { margin-top: auto; padding-top: 20px; color: var(--blue-600); font-size: .88rem; }
.empty-state { max-width: 720px; min-height: 60vh; margin: 0 auto; padding: 120px 28px; text-align: center; }
.empty-state h1 { margin: 0; font-size: 2.8rem; }
.empty-state p { margin: 14px 0 28px; color: var(--ink-600); }
.site-footer { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 34px max(28px, calc((100vw - 1180px) / 2)); color: #a9bcd1; background: var(--navy-950); }
.site-footer div { display: grid; gap: 2px; }
.site-footer strong { color: #fff; }
.site-footer a { color: var(--cyan-400); font-weight: 750; }
.nav-logout { margin: 0; }
.nav-logout button { padding: 9px 12px; border: 1px solid var(--line); border-radius: 11px; color: var(--ink-900); background: #fff; cursor: pointer; font-weight: 750; }

.auth-page .site-header, .auth-page .site-footer { display: none; }
.auth-shell { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(420px, .95fr); min-height: 100vh; color: #fff; background: radial-gradient(circle at 18% 30%, rgba(37,132,255,.2), transparent 30%), var(--navy-950); }
.auth-intro { display: flex; justify-content: center; flex-direction: column; padding: 70px max(50px, calc((100vw - 1180px) / 2)); }
.auth-back { position: absolute; top: 34px; color: #a8bed4; font-weight: 700; }
.auth-intro .eyebrow { color: var(--cyan-400); }
.auth-intro h1 { max-width: 650px; margin: 0; font-size: clamp(2.5rem, 4.8vw, 4.8rem); line-height: 1.08; letter-spacing: -.055em; }
.auth-intro > p { max-width: 560px; margin: 24px 0 0; color: #b3c5d9; font-size: 1.04rem; }
.security-note { display: grid; max-width: 520px; gap: 4px; margin-top: 42px; padding: 18px 20px; border: 1px solid rgba(71,215,232,.2); border-radius: 15px; color: #9eb3c9; background: rgba(71,215,232,.06); }
.security-note strong { color: var(--cyan-400); }
.auth-card { align-self: center; width: min(480px, calc(100% - 48px)); margin: 48px auto; padding: 34px; border-radius: 26px; color: var(--ink-900); background: #fff; box-shadow: 0 35px 90px rgba(0,0,0,.3); }
.auth-card h2 { margin: 7px 0 0; font-size: 1.75rem; letter-spacing: -.035em; }
.auth-tabs { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; padding: 5px; border-radius: 13px; background: var(--surface-soft); }
.auth-tab { min-height: 43px; border: 0; border-radius: 10px; color: var(--ink-600); background: transparent; cursor: pointer; font-weight: 800; }
.auth-tab.is-active { color: var(--blue-600); background: #fff; box-shadow: 0 5px 14px rgba(14,39,72,.08); }
.auth-card form { display: grid; gap: 18px; margin-top: 28px; }
.field-label { display: grid; gap: 8px; color: #334b67; font-size: .88rem; font-weight: 800; }
.field-label input, .field-label textarea, .field-label select { width: 100%; min-height: 50px; padding: 0 14px; border: 1px solid var(--line); border-radius: 12px; color: var(--ink-900); background: #fff; outline: none; font-weight: 500; }
.field-label input:focus, .field-label textarea:focus, .field-label select:focus { border-color: var(--blue-500); box-shadow: 0 0 0 4px rgba(37,132,255,.1); }
.code-field { display: grid; grid-template-columns: 1fr 130px; align-items: end; gap: 10px; }
.send-code { min-height: 50px; border: 1px solid #cfe0f5; border-radius: 12px; color: var(--blue-600); background: #eef6ff; cursor: pointer; font-size: .88rem; font-weight: 800; }
.send-code:disabled { cursor: wait; opacity: .62; }
.auth-submit { width: 100%; margin-top: 3px; border: 0; }
.button:disabled { cursor: not-allowed; opacity: .55; box-shadow: none; }
.form-message { min-height: 45px; margin: 0; color: var(--ink-600); font-size: .84rem; }
.form-alert { margin-top: 18px; padding: 12px 14px; border: 1px solid #efc1c1; border-radius: 11px; color: #9c2c2c; background: #fff0f0; font-size: .86rem; font-weight: 700; }
.test-account-note { display: grid; gap: 5px; margin-top: 18px; padding: 13px 14px; border: 1px solid #b9d7ff; border-radius: 12px; color: #3f5f82; background: #f0f7ff; font-size: .78rem; }
.test-account-note strong { color: var(--blue-600); }
.test-account-note code { color: #0a4b8e; font-weight: 800; }
.auth-divider { display: flex; align-items: center; gap: 12px; margin: 26px 0 18px; color: #8292a5; font-size: .76rem; font-weight: 750; }
.auth-divider::before, .auth-divider::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.privacy-copy { margin: 22px 0 0; color: #7b8ca1; font-size: .76rem; text-align: center; }

.member-hero { display: flex; align-items: end; justify-content: space-between; padding-bottom: 45px; }
.member-hero h1 { margin: 0; font-size: clamp(2.25rem, 4vw, 3.8rem); letter-spacing: -.05em; }
.member-hero p { margin: 8px 0 0; color: var(--ink-600); }
.member-badge { padding: 10px 16px; border: 1px solid #b9d7ff; border-radius: 999px; color: var(--blue-600); background: #eaf4ff; font-weight: 850; }
.dashboard-section { padding-top: 0; }
.dashboard-grid { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(300px, .5fr); gap: 24px; }
.section-heading.compact { margin-bottom: 22px; }
.section-heading.compact h2 { font-size: 1.8rem; }
.dashboard-catalog-link { color: var(--blue-600); font-size: .86rem; font-weight: 850; }
.member-course-list { display: grid; gap: 18px; }
.member-course-card { padding: 28px; border: 1px solid var(--line); border-radius: 22px; background: #fff; box-shadow: 0 12px 35px rgba(14,39,72,.06); }
.member-course-overview { display: grid; grid-template-columns: 200px minmax(0, 1fr); gap: 22px; align-items: center; }
.member-course-overview > img { aspect-ratio: 3 / 2; border-radius: 15px; background: var(--navy-900); }
.member-course-overview > div > span { color: var(--blue-600); font-size: .75rem; font-weight: 850; letter-spacing: .09em; }
.member-course-card h3 { margin: 12px 0 8px; font-size: 1.45rem; }
.member-course-card p { margin: 0; color: var(--ink-600); }
.member-course-card.is-locked { background: #f0f3f7; opacity: .78; }
.progress-track { height: 8px; margin-top: 26px; overflow: hidden; border-radius: 999px; background: #e4ebf3; }
.progress-track span { display: block; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--blue-600), var(--cyan-400)); }
.member-course-footer { display: flex; justify-content: space-between; margin-top: 12px; }
.member-course-footer small { color: var(--ink-600); }
.member-course-footer a { color: var(--blue-600); font-weight: 850; }
.locked-note { margin-top: 24px; padding: 11px 14px; border-radius: 10px; color: #6f8094; background: #e5eaf0; font-size: .86rem; font-weight: 750; }
.dashboard-side { display: grid; align-content: start; gap: 18px; }
.side-card { padding: 25px; border: 1px solid var(--line); border-radius: 20px; background: #fff; }
.side-card h2 { margin: 0; font-size: 1.25rem; }
.side-card p { margin: 12px 0 0; color: var(--ink-600); font-size: .9rem; }
.side-card > a { display: grid; gap: 2px; margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--line); }
.side-card > a small { color: var(--ink-600); }
.side-card-action { margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--line); }
.side-card-action button { padding: 0; border: 0; color: var(--blue-600); background: transparent; cursor: pointer; font-weight: 800; }
.ai-card { color: #fff; border: 0; background: linear-gradient(145deg, var(--navy-900), #174c79); }
.ai-card p { color: #bdd0e2; }
.ai-card > a { border-color: rgba(255,255,255,.13); color: #fff; }
.ai-card > a small { color: #a9bfd3; }

.course-heading { color: #fff; background: radial-gradient(circle at 75%, rgba(71,215,232,.18), transparent 28%), var(--navy-950); }
.course-heading .section-shell { padding-block: 76px; }
.course-heading .breadcrumb { display: block; margin-bottom: 34px; color: #91a9c2; }
.course-heading-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(360px, .95fr); gap: 54px; align-items: center; }
.course-heading-copy { min-width: 0; }
.course-heading .eyebrow { color: var(--cyan-400); }
.course-heading h1 { overflow-wrap: anywhere; margin: 0; font-size: clamp(2.3rem, 4vw, 4rem); line-height: 1.08; letter-spacing: -.055em; }
.course-heading p { max-width: 690px; margin: 18px 0 0; color: #b8c9db; font-size: 1.05rem; }
.course-meta { display: flex; gap: 26px; margin-top: 30px; color: #92abc4; font-size: .88rem; }
.course-cover-hero { aspect-ratio: 3 / 2; overflow: hidden; margin: 0; border: 1px solid rgba(255,255,255,.17); border-radius: 26px; background: var(--navy-900); box-shadow: 0 28px 70px rgba(0,0,0,.3); }
.course-technical-shell { border-bottom: 1px solid #d9e6f2; background: linear-gradient(180deg, #f7fbff, #eef6fd); }
.course-technical-shell .section-shell { padding-block: 58px; }
.technical-resource-heading { margin-bottom: 28px; }
.technical-resource-heading .eyebrow { color: var(--blue-600); }
.technical-resource-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.technical-resource-card { display: flex; min-height: 280px; flex-direction: column; padding: 25px; border: 1px solid #c6d9ec; border-radius: 20px; background: rgba(255,255,255,.92); box-shadow: 0 12px 32px rgba(16,62,108,.06); transition: border-color .2s ease, box-shadow .2s ease, transform .2s ease; }
.technical-resource-card:hover { border-color: #69a9ed; box-shadow: 0 18px 42px rgba(16,72,130,.13); transform: translateY(-3px); }
.technical-resource-type { align-self: flex-start; padding: 6px 9px; border-radius: 999px; color: #07529e; background: #e3f1ff; font-size: .7rem; font-weight: 850; letter-spacing: .06em; }
.technical-resource-card strong { margin-top: 20px; color: var(--ink-900); font-size: 1.2rem; line-height: 1.35; }
.technical-resource-card p { margin: 10px 0 0; color: var(--ink-600); font-size: .88rem; }
.technical-resource-meta { display: flex; flex-wrap: wrap; gap: 6px 12px; margin-top: auto; padding-top: 22px; color: #6c8198; font-size: .75rem; }
.technical-resource-meta span + span::before { content: "·"; margin-right: 12px; }
.technical-resource-card em { margin-top: 14px; color: var(--blue-600); font-size: .84rem; font-style: normal; font-weight: 850; }
.technical-resource-note { margin: 18px 0 0; color: #71859a; font-size: .78rem; }
.course-gate-shell { padding-block: 58px 92px; }
.course-access-gate { display: flex; align-items: center; justify-content: space-between; gap: 34px; padding: 34px; border: 1px solid #cbd9e8; border-radius: 24px; background: #fff; box-shadow: 0 16px 45px rgba(14,39,72,.08); }
.course-access-gate h2, .course-section-heading h2 { margin: 0; font-size: clamp(1.65rem, 3vw, 2.3rem); letter-spacing: -.035em; }
.course-access-gate p { max-width: 700px; margin: 10px 0 0; color: var(--ink-600); }
.locked-course-actions { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-top: 20px; }
.locked-action-card { display: grid; grid-template-columns: 52px 1fr; gap: 18px; min-height: 190px; padding: 25px; border: 1px solid #cbd9e8; border-radius: 20px; background: linear-gradient(145deg, #fff, #f2f7fc); box-shadow: 0 10px 28px rgba(14,39,72,.05); transition: border-color .2s ease, box-shadow .2s ease, transform .2s ease; }
.locked-action-card:hover { border-color: #7eb5f5; box-shadow: 0 16px 38px rgba(14,72,130,.11); transform: translateY(-2px); }
.locked-action-icon { display: grid; place-items: center; width: 52px; height: 52px; border-radius: 15px; color: var(--blue-600); background: #e5f2ff; font-size: 1.45rem; font-weight: 900; }
.locked-action-card > span:last-child { display: flex; flex-direction: column; min-width: 0; }
.locked-action-card small { color: var(--blue-600); font-size: .72rem; font-weight: 850; letter-spacing: .1em; }
.locked-action-card strong { margin-top: 7px; color: var(--ink-900); font-size: 1.2rem; }
.locked-action-card p { margin: 8px 0 0; color: var(--ink-600); font-size: .9rem; }
.locked-action-card em { margin-top: auto; padding-top: 18px; color: var(--blue-600); font-size: .85rem; font-style: normal; font-weight: 850; }
.member-gate-dialog { width: min(520px, calc(100% - 32px)); padding: 0; border: 0; border-radius: 24px; color: var(--ink-900); background: transparent; box-shadow: 0 28px 90px rgba(5,25,48,.3); }
.member-gate-dialog::backdrop { background: rgba(5,25,48,.68); backdrop-filter: blur(3px); }
.member-gate-dialog-content { position: relative; padding: 36px; border: 1px solid #d5e1ec; border-radius: 24px; background: #fff; }
.member-gate-dialog h2 { margin: 8px 42px 0 0; font-size: clamp(1.6rem, 4vw, 2.2rem); letter-spacing: -.035em; }
.member-gate-dialog p { margin: 13px 0 0; color: var(--ink-600); }
.dialog-close { position: absolute; top: 18px; right: 18px; display: grid; place-items: center; width: 38px; height: 38px; padding: 0; border: 1px solid var(--line); border-radius: 50%; color: var(--ink-600); background: #fff; cursor: pointer; font-size: 1.35rem; }
.member-gate-dialog-actions { display: flex; align-items: center; gap: 12px; margin-top: 28px; }
.member-gate-dialog-actions form { margin: 0; }
.course-member-shell { padding-bottom: 28px; }
.course-section-heading { display: flex; align-items: end; justify-content: space-between; gap: 34px; margin-bottom: 24px; }
.course-section-heading p { max-width: 440px; margin: 0; color: var(--ink-600); }
.material-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.material-grid > .empty-inline { grid-column: 1 / -1; }
.material-card { display: flex; min-height: 190px; flex-direction: column; padding: 24px; border: 1px solid #b9d7ff; border-radius: 19px; background: linear-gradient(145deg, #fff, #edf6ff); }
.material-card > span { color: var(--blue-600); font-size: .72rem; font-weight: 850; letter-spacing: .1em; }
.material-card > strong { margin-top: 20px; font-size: 1.18rem; }
.material-card p { margin: 8px 0 0; color: var(--ink-600); font-size: .88rem; }
.material-card em { margin-top: auto; padding-top: 18px; color: var(--blue-600); font-size: .85rem; font-style: normal; font-weight: 850; }
.curriculum-shell { display: grid; gap: 24px; }
.curriculum-section { display: grid; grid-template-columns: 72px 1fr; gap: 22px; padding: 27px; border: 1px solid var(--line); border-radius: 22px; background: #fff; }
.curriculum-number { display: grid; place-items: center; width: 54px; height: 54px; border-radius: 15px; color: var(--blue-600); background: #eaf4ff; font-weight: 900; }
.curriculum-content h2 { margin: 10px 0 24px; font-size: 1.4rem; }
.lesson-list { display: grid; gap: 8px; }
.lesson-list a { display: grid; grid-template-columns: 38px 1fr auto; align-items: center; gap: 14px; padding: 15px; border-radius: 13px; background: var(--surface-soft); }
.lesson-list a > span { color: var(--success); font-weight: 900; }
.lesson-list a > div { display: grid; }
.lesson-list small { color: var(--ink-600); }
.lesson-list em { color: var(--blue-600); font-size: .84rem; font-style: normal; font-weight: 800; }

.lesson-layout { display: grid; grid-template-columns: 285px minmax(0, 1fr); min-height: 100vh; }
.lesson-page > .site-header, .lesson-page > .site-footer { display: none; }
.lesson-page > #main { min-height: 100vh; }
.lesson-sidebar { position: sticky; top: 0; height: 100vh; padding: 27px; color: #fff; background: var(--navy-950); }
.lesson-brand { margin-bottom: 56px; color: #fff; }
.lesson-sidebar .breadcrumb { display: block; margin-bottom: 30px; color: #8ca6bf; font-size: .86rem; }
.lesson-side-title { display: grid; gap: 6px; padding: 17px; border: 1px solid rgba(255,255,255,.12); border-radius: 14px; background: rgba(255,255,255,.06); }
.lesson-side-title span { color: var(--cyan-400); font-size: .72rem; font-weight: 850; letter-spacing: .08em; }
.lesson-sidebar nav { display: grid; gap: 4px; margin-top: 26px; }
.lesson-sidebar nav a { padding: 11px 14px; border-radius: 10px; color: #90a8c1; font-size: .9rem; font-weight: 700; }
.lesson-sidebar nav a.is-active, .lesson-sidebar nav a:hover { color: #fff; background: rgba(37,132,255,.18); }
.lesson-main { min-width: 0; }
.lesson-topbar { display: flex; justify-content: space-between; padding: 17px 38px; border-bottom: 1px solid var(--line); color: var(--ink-600); background: #fff; }
.lesson-article { max-width: 850px; margin: 0 auto; padding: 70px 40px; }
.lesson-article > h1 { margin: 0; font-size: clamp(2.2rem, 4vw, 3.6rem); letter-spacing: -.045em; }
.lesson-summary { margin: 16px 0 45px; color: var(--ink-600); font-size: 1.05rem; }
.markdown-body { color: #263d57; }
.markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4 { margin: 2em 0 .7em; color: var(--ink-900); line-height: 1.3; }
.markdown-body p, .markdown-body li { font-size: 1rem; }
.markdown-body pre, .code-block pre { overflow: auto; padding: 20px; border-radius: 14px; color: #c5f3ff; background: var(--navy-950); }
.markdown-body code { padding: .12em .38em; border-radius: 5px; color: #0f5eb8; background: #eaf3fd; font-family: Consolas, monospace; }
.markdown-body pre code { padding: 0; color: inherit; background: transparent; }
.lesson-section { margin: 52px 0 30px; }
.code-block { margin-top: 18px; }
.code-block > div { display: flex; justify-content: space-between; }
.code-block button { border: 0; color: var(--blue-600); background: transparent; cursor: pointer; font-weight: 800; }
.code-block > p { color: var(--ink-600); }
.lesson-community, .lesson-ai { display: flex; align-items: center; justify-content: space-between; gap: 30px; max-width: 1000px; margin: 20px auto 70px; padding: 34px; border: 1px solid var(--line); border-radius: 23px; background: #fff; }
.lesson-community h2, .lesson-ai h2 { margin: 0; }
.lesson-community p, .lesson-ai p { margin: 8px 0 0; color: var(--ink-600); }
.button-secondary-dark { color: var(--blue-600); border-color: #b9d7ff; background: #eef6ff; }
.lesson-ai { display: block; color: #fff; border: 0; background: linear-gradient(135deg, var(--navy-900), #155a91); }
.lesson-ai p { max-width: 650px; margin-bottom: 22px; color: #bfd2e5; }
.community-panel { max-width: 1000px; margin: 20px auto 28px; padding: 34px; border: 1px solid var(--line); border-radius: 23px; background: #fff; }
.course-discussion-shell { padding-top: 24px; }
.course-community-panel { max-width: none; margin: 0; }
.community-panel .section-heading { align-items: end; }
.community-panel .section-heading > p { max-width: 420px; margin: 0; color: var(--ink-600); font-size: .9rem; }
.thread-list { display: grid; gap: 10px; }
.thread-list > a { display: grid; gap: 7px; padding: 18px 20px; border: 1px solid #e1e9f3; border-radius: 15px; background: var(--surface-soft); transition: border-color .2s, transform .2s; }
.thread-list > a:hover { border-color: #a9cdf6; transform: translateY(-1px); }
.thread-list p { margin: 0; color: var(--ink-600); font-size: .9rem; }
.thread-list small { color: #71849a; }
.thread-flags { display: flex; flex-wrap: wrap; gap: 6px; }
.thread-flags span { padding: 3px 7px; border-radius: 999px; color: #0d5ba9; background: #e1efff; font-size: .68rem; font-weight: 850; }
.empty-inline { padding: 22px; border: 1px dashed #cbd9e8; border-radius: 14px; color: var(--ink-600); text-align: center; }
.discussion-composer { margin-top: 22px; border-top: 1px solid var(--line); }
.discussion-composer summary { width: max-content; margin-top: 20px; color: var(--blue-600); cursor: pointer; font-weight: 850; }
.discussion-composer form, .reply-composer { display: grid; gap: 16px; margin-top: 22px; }
.discussion-composer textarea, .reply-composer textarea, .ai-question-form textarea { width: 100%; padding: 13px 14px; border: 1px solid var(--line); border-radius: 12px; color: var(--ink-900); background: #fff; font: inherit; line-height: 1.6; outline: none; resize: vertical; }
.discussion-composer textarea:focus, .reply-composer textarea:focus, .ai-question-form textarea:focus { border-color: var(--blue-500); box-shadow: 0 0 0 4px rgba(37,132,255,.1); }
.form-row { display: grid; grid-template-columns: .65fr 1.35fr; gap: 14px; }
.code-input { font-family: Consolas, Monaco, monospace !important; }
.ai-question-form { display: grid; grid-template-columns: 1fr auto; align-items: end; gap: 12px; }
.ai-question-form label { grid-column: 1 / -1; color: #d3e3f2; font-size: .84rem; font-weight: 800; }
.ai-question-form textarea { min-height: 90px; color: #fff; border-color: rgba(255,255,255,.2); background: rgba(255,255,255,.08); }
.ai-question-form textarea::placeholder { color: #94aec8; }
.ai-answer { display: grid; gap: 8px; margin-top: 18px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.15); color: #e2edf7; white-space: pre-wrap; }
.ai-answer:empty { display: none; }
.ai-answer p { max-width: none; margin: 0; color: inherit; }
.ai-answer ul { margin: 2px 0 0; padding-left: 20px; }
.ai-answer a { color: var(--cyan-400); font-weight: 800; }

.discussion-page { max-width: 940px; margin: 0 auto; padding: 72px 28px; }
.discussion-page > .breadcrumb { display: inline-block; margin-bottom: 28px; color: var(--blue-600); font-weight: 800; }
.thread-detail, .reply-section { padding: 34px; border: 1px solid var(--line); border-radius: 23px; background: #fff; }
.thread-detail h1 { margin: 12px 0 8px; font-size: clamp(2rem, 4vw, 3.2rem); letter-spacing: -.045em; }
.thread-context, .thread-author { color: var(--ink-600); font-size: .87rem; }
.thread-body { margin-top: 30px; }
.repo-link { display: inline-flex; margin-top: 20px; color: var(--blue-600); font-weight: 800; }
.thread-detail .code-block { margin-top: 26px; }
.reply-section { margin-top: 22px; }
.reply-section h2 { margin-top: 0; }
.reply-list { display: grid; gap: 12px; }
.reply-card { padding: 20px; border-radius: 14px; background: var(--surface-soft); }
.reply-card header { display: flex; justify-content: space-between; gap: 12px; color: var(--ink-600); font-size: .82rem; }
.reply-card .markdown-body { margin-top: 12px; }
.reply-composer { padding-top: 22px; border-top: 1px solid var(--line); }

.admin-login-page > .site-header, .admin-login-page > .site-footer { display: none; }
.admin-login-page > #main { min-height: 100vh; }
.admin-login-shell { display: grid; grid-template-columns: 1.05fr .95fr; min-height: 100vh; color: #fff; background: radial-gradient(circle at 16% 28%, rgba(37,132,255,.22), transparent 29%), var(--navy-950); }
.admin-login-copy { display: flex; justify-content: center; flex-direction: column; gap: 20px; padding: 70px max(50px, calc((100vw - 1180px) / 2)); }
.admin-login-copy .brand { position: absolute; top: 34px; color: #fff; }
.admin-login-copy .eyebrow { color: var(--cyan-400); }
.admin-login-copy h1 { margin: 0; font-size: clamp(3rem, 6vw, 6rem); line-height: .98; letter-spacing: -.065em; }
.admin-login-copy p { max-width: 560px; margin: 0; color: #aec2d6; }
.admin-login-card { align-self: center; width: min(480px, calc(100% - 48px)); margin: 48px auto; padding: 36px; border-radius: 26px; color: var(--ink-900); background: #fff; box-shadow: 0 35px 90px rgba(0,0,0,.32); }
.admin-login-card h2 { margin: 8px 0 24px; font-size: 2rem; }
.admin-login-card form { display: grid; gap: 17px; }
.admin-login-card > p { margin: 20px 0 0; color: var(--ink-600); font-size: .8rem; }
.admin-remember-choice { align-items: flex-start !important; padding: 12px 14px; border: 1px solid #d7e5f4; border-radius: 12px; background: #f7faff; }
.admin-remember-choice input { margin-top: 3px; accent-color: var(--blue-600); }
.admin-remember-choice span { display: grid; gap: 3px; color: #334b67; font-size: .88rem; font-weight: 800; }
.admin-remember-choice small { color: var(--ink-600); font-size: .76rem; font-weight: 500; line-height: 1.5; }

.admin-page { min-width: 320px; color: var(--ink-900); background: #f2f6fb; }
.admin-shell { display: grid; grid-template-columns: 255px minmax(0, 1fr); min-height: 100vh; }
.admin-sidebar { position: sticky; top: 0; display: flex; flex-direction: column; height: 100vh; padding: 28px 22px; color: #fff; background: var(--navy-950); z-index: 30; }
.admin-brand { color: #fff; }
.admin-identity { display: grid; gap: 3px; margin: 35px 0 24px; padding: 16px; border: 1px solid rgba(255,255,255,.11); border-radius: 14px; background: rgba(255,255,255,.05); }
.admin-identity span { overflow: hidden; color: #8ea6bf; font-size: .75rem; text-overflow: ellipsis; }
.admin-sidebar nav { display: grid; gap: 5px; }
.admin-sidebar nav a { padding: 11px 13px; border-radius: 10px; color: #94abc2; font-size: .9rem; font-weight: 750; }
.admin-sidebar nav a:hover, .admin-sidebar nav a.is-active { color: #fff; background: rgba(37,132,255,.2); }
.admin-sidebar > form { margin-top: auto; }
.admin-sidebar > form button { width: 100%; padding: 11px; border: 1px solid rgba(255,255,255,.14); border-radius: 10px; color: #9db2c7; background: transparent; cursor: pointer; font-weight: 750; }
.admin-main { min-width: 0; padding: 48px clamp(24px, 4vw, 64px) 80px; }
.admin-mobile-header { display: none; }
.admin-page-head { display: flex; align-items: end; justify-content: space-between; gap: 30px; margin-bottom: 30px; }
.admin-page-head h1 { margin: 6px 0 8px; font-size: clamp(2.1rem, 4vw, 3.6rem); letter-spacing: -.052em; }
.admin-page-head p { max-width: 680px; margin: 0; color: var(--ink-600); }
.admin-head-actions { display: flex; gap: 10px; }
.admin-session-note { padding: 9px 13px; border: 1px solid #cae0f8; border-radius: 999px; color: #35648f; background: #fff; font-size: .78rem; font-weight: 800; }
.admin-stat-grid { display: grid; grid-template-columns: repeat(5, minmax(125px, 1fr)); gap: 14px; margin-bottom: 22px; }
.admin-stat-grid > div { display: grid; gap: 3px; padding: 22px; border: 1px solid var(--line); border-radius: 18px; background: #fff; box-shadow: 0 10px 30px rgba(14,39,72,.04); }
.admin-stat-grid strong { font-size: 2rem; }
.admin-stat-grid span { color: var(--ink-600); font-size: .82rem; }
.admin-panel { min-width: 0; margin-bottom: 20px; padding: 25px; border: 1px solid var(--line); border-radius: 20px; background: #fff; box-shadow: 0 12px 34px rgba(14,39,72,.045); }
.admin-panel-head { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 20px; }
.admin-panel-head h2 { margin: 5px 0 0; }
.admin-panel-head > span { color: var(--ink-600); font-size: .8rem; }
.admin-panel-head a { color: var(--blue-600); font-weight: 800; }
.narrow-panel { max-width: 620px; }
.admin-alert { margin: 0 0 20px; padding: 13px 17px; border: 1px solid #a8dbc2; border-radius: 12px; color: #126b47; background: #eaf9f1; font-weight: 750; }
.admin-alert.is-error { color: #9c2c2c; border-color: #efc1c1; background: #fff0f0; }
.admin-table-wrap { overflow-x: auto; }
.admin-table-wrap table { width: 100%; border-collapse: collapse; font-size: .86rem; }
.admin-table-wrap th, .admin-table-wrap td { padding: 14px 13px; border-bottom: 1px solid #e8edf4; text-align: left; vertical-align: top; }
.admin-table-wrap th { color: #60758c; background: #f6f9fc; font-size: .72rem; letter-spacing: .05em; text-transform: uppercase; }
.admin-table-wrap td > strong, .admin-table-wrap td > span, .admin-table-wrap td > small { display: block; }
.admin-table-wrap td > small { margin-top: 3px; color: var(--ink-600); }
.admin-table-wrap details { min-width: 230px; }
.admin-table-wrap details > summary { color: var(--blue-600); cursor: pointer; font-weight: 800; }
.admin-form { display: grid; gap: 15px; }
.admin-form-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.admin-form label { display: grid; align-content: start; gap: 7px; color: #3c526a; font-size: .79rem; font-weight: 800; }
.admin-form input, .admin-form select, .admin-form textarea { width: 100%; min-height: 44px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; color: var(--ink-900); background: #fff; font: inherit; line-height: 1.5; outline: none; }
.admin-form textarea { resize: vertical; }
.admin-form input:focus, .admin-form select:focus, .admin-form textarea:focus { border-color: var(--blue-500); box-shadow: 0 0 0 3px rgba(37,132,255,.1); }
.admin-form .span-2 { grid-column: span 2; }
.admin-form .button { width: max-content; }
.admin-form small { color: var(--ink-600); }
.compact-form { margin: 14px 0; }
.admin-code-editor { font-family: Consolas, Monaco, monospace !important; font-size: .86rem !important; tab-size: 2; }
.check-label { display: flex !important; align-items: center; align-content: center; flex-direction: row; gap: 8px !important; min-height: 44px; }
.check-label input { width: 17px; min-height: 17px; }
.admin-text-button { padding: 0; border: 0; color: var(--blue-600); background: none; cursor: pointer; font: inherit; font-weight: 800; }
.admin-tag { display: inline-flex; width: max-content; padding: 4px 8px; border-radius: 999px; color: #155fa6; background: #e4f1ff; font-size: .68rem; font-weight: 850; }
.admin-status { display: inline-flex !important; width: max-content; padding: 5px 8px; border-radius: 999px; font-size: .7rem; font-weight: 850; }
.admin-status.is-ok { color: #126b47; background: #ddf6e9; }
.admin-status.is-off { color: #7a8898; background: #edf0f3; }
.admin-popover { position: relative; }
.admin-popover > summary { list-style: none; cursor: pointer; }
.admin-popover > form { position: absolute; right: 0; top: calc(100% + 10px); width: min(520px, 85vw); padding: 22px; border: 1px solid var(--line); border-radius: 16px; background: #fff; box-shadow: 0 24px 70px rgba(14,39,72,.18); z-index: 20; }
.admin-content-grid { display: grid; grid-template-columns: 1fr 1fr; align-items: start; gap: 20px; }
.admin-content-grid > details > summary, .admin-section-summary { display: flex; align-items: center; justify-content: space-between; cursor: pointer; font-size: 1.1rem; font-weight: 850; list-style: none; }
.admin-content-grid > details[open] > summary, .admin-section-summary { margin-bottom: 22px; }
.admin-content-grid > details > summary strong { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 9px; color: var(--blue-600); background: #e9f3ff; font-size: .76rem; }
.admin-content-grid .span-full { grid-column: 1 / -1; }
.admin-record { margin-top: 13px; padding: 14px; border: 1px solid #e2e9f2; border-radius: 13px; background: #f8fafc; }
.admin-record > summary { display: flex; justify-content: space-between; gap: 15px; cursor: pointer; list-style: none; font-weight: 800; }
.admin-record > summary small { color: var(--ink-600); font-weight: 600; }
.admin-record > form, .admin-record > p { margin-top: 18px; }
.admin-record > a { color: var(--blue-600); font-size: .84rem; font-weight: 800; }
.admin-record-list { display: grid; gap: 11px; }
.admin-report { display: flex; justify-content: space-between; gap: 20px; padding: 18px; border: 1px solid #f0cece; border-radius: 14px; background: #fff7f7; }
.admin-report p { margin: 7px 0; }
.admin-report small { color: var(--ink-600); }
.admin-report form { display: flex; align-items: center; gap: 8px; }
.admin-report button { padding: 8px 10px; border: 1px solid #e2bcbc; border-radius: 8px; color: #8b3434; background: #fff; cursor: pointer; }
.admin-provider-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.provider-card > header { display: flex; align-items: start; justify-content: space-between; gap: 16px; }
.provider-card h2 { margin: 8px 0 0; }
.provider-card > p { color: var(--ink-600); }
.provider-card dl { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.provider-card dl div { padding: 12px; border-radius: 10px; background: #f5f8fb; }
.provider-card dt { color: var(--ink-600); font-size: .72rem; }
.provider-card dd { overflow-wrap: anywhere; margin: 4px 0 0; font-size: .82rem; font-weight: 800; }
.provider-fields { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 15px; padding: 16px; border: 1px solid #dae6f2; border-radius: 12px; background: #f7faff; }
.provider-fields[hidden] { display: none; }
.provider-test { margin-top: 13px; }
.provider-test > summary { color: #886212; cursor: pointer; font-size: .8rem; font-weight: 800; }
.provider-test form { margin-top: 13px; padding: 14px; border-radius: 12px; background: #fff8e9; }
.dynamic-article { max-width: 920px; margin: 0 auto; padding: 75px 30px 100px; }
.dynamic-article > header { padding-bottom: 35px; border-bottom: 1px solid var(--line); }
.dynamic-article .breadcrumb { display: inline-block; margin-bottom: 38px; color: var(--blue-600); font-weight: 800; }
.dynamic-article h1 { max-width: 820px; margin: 10px 0 18px; font-size: clamp(2.5rem, 6vw, 5.2rem); line-height: 1.08; letter-spacing: -.06em; }
.dynamic-article header > p { max-width: 720px; color: var(--ink-600); font-size: 1.05rem; }
.dynamic-article header > div { display: flex; gap: 18px; margin-top: 25px; color: #71849a; font-size: .82rem; }
.dynamic-article-body { padding-top: 25px; }

@media (max-width: 980px) {
  .hero-section { grid-template-columns: 1fr; min-height: auto; padding-top: 70px; }
  .hero-panel { max-width: 650px; }
  .section-heading { align-items: start; flex-direction: column; gap: 14px; }
  .resource-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .catalog-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .technical-resource-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .course-heading-grid { grid-template-columns: 1fr; }
  .course-cover-hero { width: min(720px, 100%); }
  .course-section-heading { align-items: flex-start; flex-direction: column; gap: 12px; }
  .main-nav { position: absolute; left: 20px; right: 20px; top: 68px; display: none; align-items: stretch; flex-direction: column; gap: 4px; padding: 14px; border: 1px solid var(--line); border-radius: 16px; background: #fff; box-shadow: var(--shadow); }
  .main-nav.is-open { display: flex; }
  .main-nav a { padding: 10px 12px; }
  .nav-resource-menu summary { justify-content: space-between; padding: 10px 12px; }
  .nav-resource-panel { position: static; width: auto; margin: 4px 5px 8px; padding: 9px; border-radius: 16px; box-shadow: none; transform: none; animation: none; }
  .nav-resource-panel::before { display: none; }
  .nav-resource-intro { padding: 14px; }
  .nav-resource-links > a { padding: 10px; }
  .nav-resource-links > a:hover, .nav-resource-links > a:focus-visible { transform: none; }
  .nav-toggle { display: flex; }
  .auth-shell { grid-template-columns: 1fr; }
  .auth-intro { min-height: 440px; padding: 90px 42px 45px; }
  .auth-card { margin-top: -16px; }
  .dashboard-grid { grid-template-columns: 1fr; }
  .lesson-layout { grid-template-columns: 1fr; }
  .lesson-sidebar { position: static; height: auto; }
  .lesson-sidebar nav { grid-template-columns: repeat(4, 1fr); }
  .lesson-brand { margin-bottom: 30px; }
  .community-panel, .lesson-ai { margin-inline: 26px; }
  .admin-login-shell { grid-template-columns: 1fr; }
  .admin-login-copy { min-height: 430px; padding: 95px 42px 50px; }
  .admin-login-card { margin-top: -18px; }
  .admin-shell { grid-template-columns: 1fr; }
  .admin-sidebar { position: fixed; left: 0; width: 255px; transform: translateX(-105%); transition: transform .22s; box-shadow: 18px 0 55px rgba(0,0,0,.2); }
  .admin-sidebar.is-open { transform: translateX(0); }
  .admin-main { padding-top: 82px; }
  .admin-mobile-header { position: fixed; left: 0; right: 0; top: 0; display: flex; align-items: center; justify-content: space-between; min-height: 62px; padding: 0 24px; border-bottom: 1px solid var(--line); background: rgba(255,255,255,.95); z-index: 20; }
  .admin-mobile-header button { padding: 8px 12px; border: 1px solid var(--line); border-radius: 9px; background: #fff; }
  .admin-stat-grid { grid-template-columns: repeat(3, 1fr); }
  .admin-content-grid, .admin-provider-grid { grid-template-columns: 1fr; }
  .admin-content-grid .span-full { grid-column: auto; }
}

@media (max-width: 560px) {
  .site-header { min-height: 66px; padding-inline: 18px; }
  .site-header .brand { gap: 9px; }
  .site-header .brand-logo { width: 40px; height: 40px; }
  .hero-section { gap: 42px; padding: 58px 20px; }
  .hero-copy h1 { font-size: 2.55rem; }
  .hero-actions, .hero-actions .button { width: 100%; }
  .hero-panel { padding: 20px; border-radius: 22px; }
  .hero-points { align-items: flex-start; flex-direction: column; gap: 8px; }
  .section-shell { padding: 66px 20px; }
  .course-grid, .resource-grid { grid-template-columns: 1fr; }
  .catalog-grid, .material-grid, .locked-course-actions, .technical-resource-grid { grid-template-columns: 1fr; }
  .technical-resource-card { min-height: 245px; padding: 22px 20px; }
  .catalog-hero .section-shell { padding-block: 64px; }
  .catalog-card { min-height: 280px; }
  .course-card { min-height: 310px; padding: 25px; }
  .course-card-cover { margin: -25px -25px 24px; }
  .manual-banner { align-items: flex-start; flex-direction: column; margin: 0 20px; padding: 32px 26px; border-radius: 23px; }
  .manual-banner .button { width: 100%; }
  .site-footer { align-items: flex-start; flex-direction: column; padding: 30px 20px; }
  .auth-intro { min-height: 400px; padding: 84px 20px 58px; }
  .auth-intro h1 { font-size: 2.5rem; }
  .auth-card { width: calc(100% - 28px); margin: -28px auto 28px; padding: 24px 20px; }
  .code-field { grid-template-columns: 1fr; }
  .send-code { width: 100%; }
  .member-hero { align-items: flex-start; flex-direction: column; gap: 20px; padding-top: 55px; }
  .member-course-card { padding: 22px; }
  .member-course-overview { grid-template-columns: 1fr; }
  .member-course-footer { align-items: flex-start; flex-direction: column; gap: 10px; }
  .course-access-gate { align-items: flex-start; flex-direction: column; padding: 25px 22px; }
  .course-access-gate .button { width: 100%; }
  .locked-action-card { min-height: 170px; padding: 22px 20px; }
  .member-gate-dialog-content { padding: 30px 22px 24px; }
  .member-gate-dialog-actions { align-items: stretch; flex-direction: column; }
  .member-gate-dialog-actions .button, .member-gate-dialog-actions form, .member-gate-dialog-actions button { width: 100%; }
  .course-meta { align-items: flex-start; flex-direction: column; gap: 8px; }
  .curriculum-section { grid-template-columns: 1fr; padding: 21px; }
  .lesson-list a { grid-template-columns: 32px 1fr; }
  .lesson-list em { grid-column: 2; }
  .lesson-sidebar { padding: 22px 20px; }
  .lesson-sidebar nav { grid-template-columns: 1fr 1fr; }
  .lesson-topbar { padding: 15px 20px; }
  .lesson-article { padding: 54px 20px; }
  .lesson-community, .lesson-ai { align-items: flex-start; flex-direction: column; margin: 15px 20px 48px; padding: 25px 22px; }
  .community-panel { margin: 15px 20px 28px; padding: 25px 20px; }
  .course-community-panel { margin: 0; }
  .community-panel .section-heading { align-items: flex-start; }
  .form-row, .ai-question-form { grid-template-columns: 1fr; }
  .ai-question-form button { width: 100%; }
  .discussion-page { padding: 48px 18px; }
  .thread-detail, .reply-section { padding: 24px 20px; }
  .admin-login-copy { min-height: 360px; padding: 82px 22px 58px; }
  .admin-login-copy h1 { font-size: 3rem; }
  .admin-login-card { width: calc(100% - 28px); margin: -25px auto 28px; padding: 24px 20px; }
  .admin-main { padding: 82px 16px 50px; }
  .admin-page-head { align-items: flex-start; flex-direction: column; gap: 15px; }
  .admin-page-head h1 { font-size: 2.35rem; }
  .admin-stat-grid { grid-template-columns: 1fr 1fr; }
  .admin-stat-grid > div { padding: 17px; }
  .admin-panel { padding: 19px 16px; border-radius: 16px; }
  .admin-form-grid, .provider-fields { grid-template-columns: 1fr; }
  .admin-form .span-2 { grid-column: auto; }
  .admin-report { flex-direction: column; }
  .admin-popover > form { position: fixed; left: 14px; right: 14px; top: 80px; width: auto; max-height: calc(100vh - 100px); overflow: auto; }
  .admin-record > summary { align-items: flex-start; flex-direction: column; gap: 4px; }
}

.home-json-status { min-height: 28px; margin: -30px 0 22px; color: var(--ink-600); font-size: .86rem; }
.home-loading-card { min-height: 250px; display: grid; place-content: center; text-align: center; color: var(--ink-600); }
.home-loading-card h3 { margin: 0 0 8px; color: var(--ink-900); }
.member-learning-spotlight { padding-top: 0; }
.member-learning-card { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 24px; align-items: center; padding: 28px 32px; border: 1px solid rgba(37,132,255,.18); border-radius: 22px; color: #fff; background: linear-gradient(125deg, var(--navy-950), #174e88); box-shadow: 0 18px 42px rgba(14,39,72,.14); }
.member-learning-card:hover { transform: translateY(-2px); box-shadow: 0 22px 48px rgba(14,39,72,.2); }
.member-learning-card h2 { margin: 7px 0 8px; font-size: 1.55rem; }
.member-learning-card p { margin: 0; color: rgba(255,255,255,.76); }
.member-learning-card .eyebrow { color: var(--cyan-400); }
.member-learning-arrow { font-size: 1.8rem; color: var(--cyan-400); }

@media (max-width: 560px) {
  .home-json-status { margin-top: -20px; }
  .member-learning-card { grid-template-columns: 1fr; gap: 12px; padding: 24px 22px; }
}