@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;500;600;700;800;900&display=swap');

:root {
    --bg: #f6f3ff;
    --panel: #ffffff;
    --panel-soft: #fbfaff;
    --text: #17122b;
    --muted: #716a87;
    --line: #e8e1fb;
    --primary: #7c3aed;
    --primary-dark: #5b21b6;
    --accent: #a78bfa;
    --accent-2: #22c55e;
    --warning: #f59e0b;
    --success: #16a34a;
    --danger: #dc2626;
    --shadow: 0 24px 60px rgba(77, 46, 146, 0.16);
}

* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: Nunito, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at top left, rgba(124, 58, 237, 0.18), transparent 32rem),
        radial-gradient(circle at top right, rgba(34, 197, 94, 0.10), transparent 28rem),
        linear-gradient(180deg, #fff 0%, var(--bg) 100%);
}

a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }

.topbar {
    max-width: 1180px;
    margin: 24px auto 0;
    padding: 14px 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(255,255,255,0.78);
    border: 1px solid var(--line);
    border-radius: 24px;
    backdrop-filter: blur(18px);
}

.brand {
    display: inline-flex;
    gap: 10px;
    align-items: center;
    font-weight: 800;
    color: var(--primary-dark);
}
.brand span {
    display: grid;
    place-items: center;
    width: 34px;
    height: 34px;
    color: #fff;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
}

.topnav { display: flex; gap: 22px; color: var(--muted); font-weight: 600; }
.landing-topbar { position: sticky; top: 18px; z-index: 20; }
.hero {
    max-width: 1180px;
    margin: 72px auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 0.9fr;
    gap: 44px;
    align-items: center;
}
.hero h1 { font-size: clamp(42px, 6vw, 76px); line-height: 0.95; margin: 0 0 22px; letter-spacing: -0.06em; }
.hero p { font-size: 18px; line-height: 1.7; color: var(--muted); }
.landing-hero { min-height: 72vh; }
.landing-hero h1 { max-width: 760px; }
.eyebrow { margin: 0 0 8px; text-transform: uppercase; letter-spacing: 0.12em; color: var(--primary); font-size: 12px; font-weight: 800; }
.hero-actions, .quick-links, .form-actions { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.hero-card { padding: 28px; border-radius: 34px; background: linear-gradient(135deg, #8b5cf6, #c4b5fd); box-shadow: var(--shadow); transform: rotate(2deg); }
.mock-window { background: #fff; border-radius: 24px; padding: 24px; box-shadow: 0 16px 35px rgba(31, 16, 78, 0.18); }
.mock-header { width: 42%; height: 10px; border-radius: 99px; background: #eee8ff; margin-bottom: 24px; }
.mini-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-top: 18px; }
.mini-grid div { padding: 16px; border-radius: 16px; background: var(--panel-soft); color: var(--muted); }
.landing-product { position: relative; transform: rotate(1.5deg); }
.product-window { min-height: 360px; }
.floating-card {
    position: absolute;
    z-index: 2;
    min-width: 138px;
    padding: 16px;
    border: 1px solid rgba(255,255,255,0.45);
    border-radius: 20px;
    background: rgba(255,255,255,0.88);
    box-shadow: var(--shadow);
    backdrop-filter: blur(14px);
}
.floating-card i { color: var(--primary); font-size: 24px; }
.floating-card strong { display: block; margin-top: 8px; font-size: 26px; }
.floating-card span { color: var(--muted); font-weight: 800; }
.card-a { left: -26px; bottom: 36px; }
.card-b { right: -18px; top: 30px; }
.lesson-preview { display: grid; gap: 12px; margin-top: 22px; }
.lesson-preview div {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px;
    border-radius: 16px;
    background: var(--panel-soft);
    font-weight: 800;
}
.lesson-preview i { color: var(--primary); font-size: 22px; }
.trust-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 20px; }
.trust-row span {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 999px;
    color: var(--primary-dark);
    background: #f1ecff;
    font-weight: 900;
}

.section { max-width: 1180px; margin: 48px auto; padding: 0 20px; }
.cards-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card, .panel, .auth-card, .stat-card, .course-card {
    background: rgba(255,255,255,0.92);
    border: 1px solid var(--line);
    border-radius: 24px;
    box-shadow: 0 12px 34px rgba(77, 46, 146, 0.08);
}
.card { padding: 24px; transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease; }
.card:hover, .course-card:hover, .lesson-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: #d8ccfb; }
.card h3, .card h4, .panel h2, .panel h3 { margin-top: 0; }
.feature-card i {
    width: 46px;
    height: 46px;
    display: grid;
    place-items: center;
    margin-bottom: 16px;
    border-radius: 16px;
    color: #fff;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    font-size: 24px;
}
.compact-card { padding: 18px; }
.auth-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; align-items: start; }
.auth-card { padding: 28px; display: grid; gap: 14px; }

.btn {
    border: 0;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 42px;
    padding: 0 18px;
    border-radius: 14px;
    font-weight: 800;
    background: #f1ecff;
    color: var(--primary-dark);
}
.btn.primary { color: #fff; background: linear-gradient(135deg, var(--primary), var(--accent)); box-shadow: 0 12px 22px rgba(124, 58, 237, 0.26); }
.btn.ghost { border: 1px solid var(--line); background: #fff; }
.btn.danger { color: #fff; background: linear-gradient(135deg, #ef4444, #dc2626); }
.btn.small { min-height: 34px; padding: 0 12px; border-radius: 11px; font-size: 13px; }
.btn:hover { transform: translateY(-1px); }

label { display: grid; gap: 7px; font-weight: 700; color: var(--text); }
input, select, textarea {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 12px 14px;
    background: #fff;
    color: var(--text);
}
textarea { min-height: 110px; resize: vertical; }
.alert, .success, .hint {
    padding: 14px 16px;
    border-radius: 16px;
    margin: 12px 0;
    background: #fff1f2;
    border: 1px solid #fecdd3;
    color: #9f1239;
}
.success { background: #f0fdf4; border-color: #bbf7d0; color: #166534; }
.hint { background: #f5f3ff; border-color: var(--line); color: var(--primary-dark); }
.muted { color: var(--muted); }
.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    width: max-content;
    padding: 6px 10px;
    border-radius: 999px;
    background: #f1ecff;
    color: var(--primary-dark);
    font-size: 12px;
    font-weight: 800;
}

.app-shell { display: grid; grid-template-columns: 292px 1fr; min-height: 100vh; }
.sidebar {
    position: sticky;
    top: 0;
    height: 100vh;
    padding: 26px;
    background: rgba(255,255,255,0.86);
    border-right: 1px solid var(--line);
    backdrop-filter: blur(18px);
    display: flex;
    flex-direction: column;
    gap: 26px;
}
.side-nav { display: grid; gap: 8px; }
.side-nav a, .logout {
    display: flex;
    align-items: center;
    gap: 11px;
    padding: 13px 14px;
    border-radius: 14px;
    color: var(--muted);
    font-weight: 800;
}
.side-nav a i, .logout i { font-size: 20px; }
.side-nav a.active, .side-nav a:hover {
    color: var(--primary-dark);
    background: linear-gradient(135deg, #f1ecff, #fff);
    box-shadow: inset 3px 0 0 var(--primary);
}
.logout { margin-top: auto; color: var(--danger); }
.main { padding: 28px; max-width: 1220px; width: 100%; }
.page-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 26px;
}
.page-top h1 { margin: 0; font-size: 34px; letter-spacing: -0.03em; }
.user-pill { padding: 10px 14px; border-radius: 999px; background: #fff; border: 1px solid var(--line); font-weight: 800; }

.panel { padding: 24px; margin-bottom: 22px; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 22px; }
.stats-grid.small { grid-template-columns: repeat(3, 1fr); margin: 16px 0; }
.stat-card { padding: 20px; }
.stat-card i {
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    margin-bottom: 14px;
    border-radius: 15px;
    color: var(--primary-dark);
    background: #f1ecff;
    font-size: 22px;
}
.stat-card span { color: var(--muted); font-weight: 700; }
.stat-card strong { display: block; margin-top: 8px; font-size: 30px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.section-head, .list-item {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    align-items: center;
}
.list-item {
    padding: 16px 0;
    border-bottom: 1px solid var(--line);
}
.list-item:last-child { border-bottom: 0; }
.list-item h3, .list-item p { margin: 0; }
.list-item.compact { align-items: flex-start; flex-direction: column; gap: 5px; }
.list-item.link:hover { color: var(--primary-dark); }
.progress { width: 160px; height: 9px; overflow: hidden; border-radius: 99px; background: #eee8ff; }
.progress.big { width: 100%; height: 12px; }
.progress span { display: block; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--primary), var(--accent)); }

.learning-hero {
    display: flex;
    justify-content: space-between;
    gap: 22px;
    align-items: center;
    margin-bottom: 22px;
    padding: 28px;
    border-radius: 28px;
    color: #fff;
    background:
        radial-gradient(circle at top right, rgba(255,255,255,0.32), transparent 16rem),
        linear-gradient(135deg, #6d28d9, #8b5cf6 55%, #22c55e);
    box-shadow: var(--shadow);
}
.learning-hero h2 { margin: 12px 0 8px; font-size: 30px; }
.learning-hero p { max-width: 680px; margin: 0; color: rgba(255,255,255,0.86); }
.learning-hero .badge, .learning-hero .btn.ghost { background: rgba(255,255,255,0.18); color: #fff; border-color: rgba(255,255,255,0.28); }
.learning-hero .btn.primary { background: #fff; color: var(--primary-dark); box-shadow: none; }
.admin-hero { background: linear-gradient(135deg, #111827, #6d28d9 60%, #8b5cf6); }

.course-grid { display: grid; gap: 22px; }
.course-card {
    display: grid;
    grid-template-columns: 220px 1fr;
    overflow: hidden;
    transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.course-cover {
    min-height: 220px;
    padding: 22px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    color: #fff;
    background:
        radial-gradient(circle at top right, rgba(255,255,255,0.28), transparent 10rem),
        linear-gradient(145deg, var(--primary), var(--accent));
}
.course-cover i { font-size: 54px; }
.course-cover span { font-size: 34px; font-weight: 900; }
.course-body { padding: 26px; display: grid; gap: 12px; align-content: center; }
.course-body h2 { margin: 0; font-size: 34px; }
.course-body p { margin: 0; color: var(--muted); }
.course-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 8px; }
.course-modules { margin-top: -8px; }
.module-course { padding: 20px 0; border-top: 1px solid var(--line); }
.module-course:first-of-type { border-top: 0; }
.module-title { display: flex; gap: 12px; align-items: center; margin-bottom: 14px; }
.module-title i {
    width: 40px;
    height: 40px;
    display: grid;
    place-items: center;
    border-radius: 14px;
    color: var(--primary-dark);
    background: #f1ecff;
    font-size: 21px;
}
.module-title h3 { margin: 0; }
.lesson-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.lesson-card {
    display: grid;
    grid-template-columns: 46px 1fr;
    gap: 14px;
    padding: 16px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #fff;
    transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.lesson-card h4 { margin: 4px 0 6px; font-size: 17px; }
.lesson-card p { margin: 0 0 10px; color: var(--muted); }
.lesson-card span, .lesson-card small { color: var(--muted); font-size: 13px; font-weight: 700; }
.lesson-card a { color: var(--primary-dark); font-weight: 900; }
.lesson-icon {
    width: 46px;
    height: 46px;
    display: grid;
    place-items: center;
    border-radius: 16px;
    background: #f1ecff;
    color: var(--primary-dark);
    font-size: 24px;
}
.lesson-card.completed .lesson-icon { color: var(--success); background: #dcfce7; }
.lesson-card.failed .lesson-icon { color: var(--warning); background: #fef3c7; }
.lesson-card.locked { opacity: .72; background: #fbfaff; }
.lesson-card.locked .lesson-icon { color: var(--muted); background: #f3f0fb; }
.empty-state { text-align: center; padding: 56px 24px; }
.empty-state > i { font-size: 58px; color: var(--primary); }
.course-mini i {
    display: grid;
    place-items: center;
    width: 52px;
    height: 52px;
    margin-bottom: 18px;
    border-radius: 18px;
    color: #fff;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    font-size: 27px;
}
.flow-strip {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}
.flow-strip article {
    padding: 22px;
    border-radius: 24px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: 0 12px 34px rgba(77, 46, 146, 0.08);
}
.flow-strip span {
    display: grid;
    place-items: center;
    width: 38px;
    height: 38px;
    border-radius: 14px;
    color: #fff;
    background: var(--primary);
    font-weight: 900;
}
.flow-strip p { color: var(--muted); }

.selectable input[type="radio"] { width: auto; }
.choice-card { cursor: pointer; }
.choice-card:has(input:checked) { border-color: var(--primary); box-shadow: var(--shadow); }
.full { grid-column: 1 / -1; }
.quiz-list { display: grid; gap: 18px; }
.quiz-card, .context-box, .note, .answer-row, .module-block {
    padding: 18px;
    border-radius: 18px;
    background: var(--panel-soft);
    border: 1px solid var(--line);
}
.option {
    display: flex;
    grid-template-columns: auto 1fr;
    align-items: center;
    gap: 10px;
    padding: 11px 12px;
    border-radius: 14px;
    border: 1px solid var(--line);
    background: #fff;
    margin-top: 8px;
}
.option input { width: auto; }
.timeline { display: grid; gap: 14px; margin-top: 18px; }
.timeline-item {
    display: flex;
    justify-content: space-between;
    gap: 18px;
    padding: 18px;
    border-radius: 18px;
    border: 1px solid var(--line);
    background: #fff;
}
.timeline-item.completed { border-color: #bbf7d0; }
.timeline-item.failed { border-color: #fecdd3; }
.timeline-item.locked { opacity: 0.64; }
.prose { white-space: normal; line-height: 1.75; color: #332b4d; margin: 20px 0; }

.assistant-layout { display: grid; grid-template-columns: 1fr 320px; gap: 22px; }
.chat-panel { min-height: 70vh; display: flex; flex-direction: column; }
.chat-message { max-width: 78%; padding: 14px 16px; border-radius: 18px; margin-bottom: 12px; background: #f1ecff; }
.chat-message.user { align-self: flex-end; background: var(--primary); color: #fff; }
.chat-form { margin-top: auto; display: grid; grid-template-columns: 1fr auto; gap: 12px; }
.empty { margin: auto; color: var(--muted); text-align: center; }
.clean-list { padding-left: 20px; line-height: 1.9; color: var(--muted); }

.assistant-hero {
    display: flex;
    justify-content: space-between;
    gap: 22px;
    align-items: center;
    padding: 28px;
    margin-bottom: 22px;
    border-radius: 30px;
    color: #fff;
    background:
        radial-gradient(circle at top right, rgba(255,255,255,.28), transparent 16rem),
        linear-gradient(135deg, #111827, #6d28d9 62%, #22c55e);
    box-shadow: var(--shadow);
}
.assistant-hero h2 { margin: 10px 0 8px; font-size: 32px; }
.assistant-hero p { margin: 0; color: rgba(255,255,255,.86); }
.assistant-hero .badge { background: rgba(255,255,255,.18); color: #fff; }
.assistant-orb {
    width: 110px;
    height: 110px;
    display: grid;
    place-items: center;
    border-radius: 34px;
    background: rgba(255,255,255,.18);
    border: 1px solid rgba(255,255,255,.30);
    font-size: 54px;
}
.pro-chat { grid-template-columns: 1fr 340px; }
.pro-panel { padding: 0; overflow: hidden; }
.chat-stream {
    display: flex;
    flex-direction: column;
    gap: 14px;
    min-height: 560px;
    max-height: 68vh;
    overflow-y: auto;
    padding: 24px;
    background:
        radial-gradient(circle at top left, rgba(124,58,237,.08), transparent 20rem),
        #fff;
}
.assistant-welcome {
    margin: auto;
    max-width: 440px;
    text-align: center;
    color: var(--muted);
}
.assistant-welcome i { font-size: 58px; color: var(--primary); }
.assistant-welcome h3 { color: var(--text); }
.pro-chat .chat-message {
    max-width: 86%;
    display: grid;
    grid-template-columns: 42px 1fr;
    gap: 12px;
    padding: 0;
    background: transparent;
}
.pro-chat .chat-message.user { align-self: flex-end; color: var(--text); }
.message-avatar {
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    border-radius: 15px;
    color: #fff;
    background: linear-gradient(135deg, var(--primary), var(--accent));
}
.chat-message.user .message-avatar { background: #111827; }
.message-content {
    padding: 14px 16px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #fff;
    box-shadow: 0 10px 28px rgba(77, 46, 146, 0.07);
}
.chat-message.user .message-content { background: #f1ecff; border-color: #ddd6fe; }
.message-content span { display: block; color: var(--muted); font-size: 12px; font-weight: 900; margin-bottom: 5px; }
.message-content p { margin: 0; line-height: 1.65; }
.pro-chat-form {
    padding: 16px;
    margin: 0;
    background: #fff;
    border-top: 1px solid var(--line);
}
.assistant-side { display: grid; gap: 18px; align-content: start; }
.prompt-list { display: grid; gap: 10px; }
.prompt-list button {
    width: 100%;
    display: flex;
    justify-content: space-between;
    gap: 10px;
    padding: 12px 14px;
    border: 1px solid var(--line);
    border-radius: 15px;
    color: var(--text);
    background: #fff;
    cursor: pointer;
    text-align: left;
    font-weight: 800;
}
.prompt-list button:hover { border-color: #c4b5fd; background: #fbfaff; }
.profile-mini {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-bottom: 18px;
}
.profile-mini div {
    padding: 14px;
    border-radius: 16px;
    background: #f1ecff;
}
.profile-mini span { display: block; color: var(--muted); font-size: 12px; font-weight: 900; }
.profile-mini strong { font-size: 24px; }
.mini-topic {
    padding: 12px 0;
    border-top: 1px solid var(--line);
}
.mini-topic strong { display: block; }
.mini-topic span { color: var(--muted); font-size: 13px; font-weight: 800; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 14px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-size: 13px; }
.form-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.form-stack { display: grid; gap: 14px; align-content: start; }
.form-stack h2, .form-grid h2 { display: flex; align-items: center; gap: 10px; }
.answer-row.ok { border-color: #bbf7d0; }
.answer-row.bad { border-color: #fecdd3; }
.admin-course-tree .section-head { align-items: flex-start; }
.admin-module .lesson-card form { margin-top: 10px; }

.practice-hero { background: linear-gradient(135deg, #111827, #6d28d9 58%, #22c55e); }
.practice-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
}
.practice-card {
    padding: 24px;
    border: 1px solid var(--line);
    border-radius: 26px;
    background: #fff;
    box-shadow: 0 12px 34px rgba(77, 46, 146, 0.08);
    display: grid;
    gap: 12px;
    align-content: start;
}
.practice-card > i {
    display: grid;
    place-items: center;
    width: 54px;
    height: 54px;
    border-radius: 18px;
    color: #fff;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    font-size: 28px;
}
.practice-card.primary-card {
    color: #fff;
    background:
        radial-gradient(circle at top right, rgba(255,255,255,0.28), transparent 12rem),
        linear-gradient(145deg, var(--primary), var(--accent));
}
.practice-card.primary-card p { color: rgba(255,255,255,.86); }
.practice-card.primary-card .badge, .practice-card.primary-card .btn.primary { background: #fff; color: var(--primary-dark); box-shadow: none; }

.admin-analytics-hero {
    display: flex;
    justify-content: space-between;
    gap: 22px;
    align-items: center;
    padding: 28px;
    margin-bottom: 22px;
    border-radius: 30px;
    color: #fff;
    background:
        radial-gradient(circle at top right, rgba(255,255,255,.24), transparent 16rem),
        linear-gradient(135deg, #4c1d95, #7c3aed 55%, #22c55e);
    box-shadow: var(--shadow);
}
.admin-analytics-hero h2 { margin: 10px 0 8px; font-size: 34px; }
.admin-analytics-hero p { margin: 0; color: rgba(255,255,255,.86); }
.admin-analytics-hero .badge { background: rgba(255,255,255,.18); color: #fff; }
.analytics-score {
    width: 132px;
    height: 132px;
    display: grid;
    place-items: center;
    align-content: center;
    border-radius: 34px;
    background: rgba(255,255,255,.18);
    border: 1px solid rgba(255,255,255,.30);
}
.analytics-score strong { font-size: 34px; }
.analytics-score span { font-weight: 900; opacity: .86; }
.analytics-stats .stat-card i {
    font-size: 28px;
    color: var(--primary);
}
.analytics-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
    margin-bottom: 22px;
}
.chart-panel canvas {
    width: 100% !important;
    max-height: 320px;
}

.history-hero {
    display: flex;
    justify-content: space-between;
    gap: 18px;
    align-items: center;
    padding: 26px;
    margin-bottom: 22px;
    border-radius: 28px;
    color: #fff;
    background:
        radial-gradient(circle at top right, rgba(255,255,255,.26), transparent 14rem),
        linear-gradient(135deg, #5b21b6, #7c3aed 55%, #22c55e);
    box-shadow: var(--shadow);
}
.history-hero h2 { margin: 10px 0 6px; font-size: 32px; }
.history-hero p { margin: 0; color: rgba(255,255,255,.84); }
.history-hero .badge, .history-hero .btn.primary { background: #fff; color: var(--primary-dark); box-shadow: none; }
.history-layout {
    display: grid;
    grid-template-columns: 420px 1fr;
    gap: 22px;
    align-items: start;
}
.attempt-list { display: grid; gap: 12px; }
.attempt-card {
    display: grid;
    grid-template-columns: 48px 1fr auto;
    gap: 14px;
    align-items: center;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #fff;
}
.attempt-card.active, .attempt-card:hover { border-color: #c4b5fd; box-shadow: 0 14px 32px rgba(124, 58, 237, .12); }
.attempt-card h3, .attempt-card p { margin: 0; }
.attempt-card span { color: var(--muted); font-size: 13px; font-weight: 800; }
.attempt-icon {
    display: grid;
    place-items: center;
    width: 48px;
    height: 48px;
    border-radius: 16px;
    font-size: 25px;
    background: #fef3c7;
    color: var(--warning);
}
.attempt-icon.passed { background: #dcfce7; color: var(--success); }
.report-panel { min-height: 480px; }
.report-head {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    align-items: center;
    margin-bottom: 18px;
}
.score-ring {
    width: 118px;
    height: 118px;
    display: grid;
    place-items: center;
    align-content: center;
    border-radius: 50%;
    background: #fef3c7;
    color: #92400e;
}
.score-ring.passed { background: #dcfce7; color: #166534; }
.score-ring strong { font-size: 26px; }
.score-ring span { font-size: 13px; font-weight: 900; }
.answer-list { display: grid; gap: 12px; }
.answer-row {
    display: grid;
    grid-template-columns: 38px 1fr;
    gap: 14px;
}
.answer-row p {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}
.answer-number {
    width: 38px;
    height: 38px;
    display: grid;
    place-items: center;
    border-radius: 13px;
    background: #f1ecff;
    color: var(--primary-dark);
    font-weight: 900;
}
.answer-row.ok .answer-number { background: #dcfce7; color: var(--success); }
.answer-row.bad .answer-number { background: #fee2e2; color: var(--danger); }
.compact-empty { padding: 28px 16px; }

.learning-path-hero {
    display: flex;
    justify-content: space-between;
    gap: 22px;
    align-items: center;
    padding: 28px;
    margin-bottom: 24px;
    border-radius: 30px;
    color: #fff;
    background:
        radial-gradient(circle at top right, rgba(255,255,255,.28), transparent 16rem),
        linear-gradient(135deg, #22c55e, #7c3aed 58%, #5b21b6);
    box-shadow: var(--shadow);
}
.learning-path-hero h2 { margin: 10px 0 8px; font-size: 34px; }
.learning-path-hero p { margin: 0; max-width: 720px; color: rgba(255,255,255,.86); }
.learning-path-hero .badge { background: rgba(255,255,255,.18); color: #fff; }
.path-progress {
    width: 128px;
    height: 128px;
    display: grid;
    place-items: center;
    align-content: center;
    border-radius: 50%;
    background: rgba(255,255,255,.18);
    border: 1px solid rgba(255,255,255,.30);
}
.path-progress strong { font-size: 30px; }
.path-progress span { font-weight: 900; opacity: .86; }
.path-section {
    position: relative;
    max-width: 860px;
    margin: 0 auto 28px;
}
.path-section-title {
    display: flex;
    gap: 12px;
    align-items: center;
    margin: 0 0 18px;
    padding: 16px 18px;
    border: 1px solid var(--line);
    border-radius: 22px;
    background: #fff;
    box-shadow: 0 12px 34px rgba(77, 46, 146, 0.08);
}
.path-section-title > span {
    width: 44px;
    height: 44px;
    display: grid;
    place-items: center;
    border-radius: 16px;
    background: #f1ecff;
    color: var(--primary-dark);
    font-size: 23px;
}
.path-section-title h3, .path-section-title p { margin: 0; }
.path-section-title p { color: var(--muted); font-weight: 800; }
.duo-path { position: relative; display: grid; gap: 18px; padding: 12px 0 24px; }
.duo-path::before {
    content: "";
    position: absolute;
    top: 26px;
    bottom: 26px;
    left: 50%;
    width: 6px;
    transform: translateX(-50%);
    border-radius: 999px;
    background: linear-gradient(180deg, #ddd6fe, #bbf7d0);
}
.path-node {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 76px 1fr;
    align-items: center;
    min-height: 112px;
}
.node-0 .node-button, .node-1 .node-button, .node-2 .node-button, .node-3 .node-button { grid-column: 2; }
.node-0 .node-card, .node-2 .node-card { grid-column: 3; }
.node-1 .node-card, .node-3 .node-card { grid-column: 1; grid-row: 1; text-align: right; }
.node-button {
    position: relative;
    z-index: 2;
    width: 74px;
    height: 74px;
    display: grid;
    place-items: center;
    margin: 0 auto;
    border: 7px solid #fff;
    border-radius: 50%;
    color: #fff;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    box-shadow: 0 14px 28px rgba(124,58,237,.22);
    font-size: 31px;
}
.path-node.completed .node-button { background: linear-gradient(135deg, #16a34a, #22c55e); }
.path-node.failed .node-button { background: linear-gradient(135deg, #f59e0b, #f97316); }
.path-node.locked .node-button { background: #c9c1d9; box-shadow: none; }
.node-card {
    padding: 16px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: #fff;
    box-shadow: 0 12px 34px rgba(77, 46, 146, 0.08);
}
.node-card span { color: var(--muted); font-size: 13px; font-weight: 900; }
.node-card h4 { margin: 5px 0; font-size: 18px; }
.node-card p { margin: 0 0 8px; color: var(--muted); }
.node-status { font-size: 13px; }
.node-status.ok { color: var(--success); }
.node-status.warn { color: var(--warning); }
.node-status.active { color: var(--primary-dark); }
.node-status.muted { color: var(--muted); }

.modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: none;
    place-items: center;
    padding: 18px;
    background: rgba(20, 14, 43, 0.56);
    backdrop-filter: blur(12px);
}
.modal-overlay.show { display: grid; }
.modal-card {
    position: relative;
    display: none;
    width: min(460px, 100%);
    padding: 28px;
    border: 1px solid rgba(255,255,255,0.42);
    border-radius: 28px;
    background: rgba(255,255,255,0.96);
    box-shadow: 0 32px 90px rgba(23, 18, 43, 0.28);
    gap: 14px;
}
.modal-card.active { display: grid; }
.modal-card h2 { margin: 4px 0 6px; font-size: 30px; }
.question-modal-card {
    width: min(920px, 100%);
    max-height: 92vh;
    overflow-y: auto;
}
.question-bank-hero {
    align-items: center;
}
.question-bank-hero p {
    max-width: 680px;
    color: rgba(255,255,255,.84);
}
.check-label {
    display: flex;
    align-items: center;
    gap: 9px;
}
.check-label input {
    width: auto;
}
.modal-close {
    position: absolute;
    top: 14px;
    right: 14px;
    display: grid;
    place-items: center;
    width: 38px;
    height: 38px;
    border: 0;
    border-radius: 13px;
    color: var(--muted);
    background: #f3f0fb;
    cursor: pointer;
}

.quiz-runner {
    gap: 16px;
}
.quiz-runner-top {
    position: sticky;
    top: 0;
    z-index: 5;
    display: grid;
    gap: 12px;
    padding: 16px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: rgba(255,255,255,.94);
    backdrop-filter: blur(14px);
    box-shadow: 0 10px 26px rgba(77, 46, 146, 0.08);
}
.quiz-runner-top h2 {
    margin: 8px 0 0;
}
.quiz-progress-line {
    height: 10px;
    overflow: hidden;
    border-radius: 999px;
    background: #f1ecff;
}
.quiz-progress-line span {
    display: block;
    width: 0;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(135deg, var(--primary), var(--accent-2));
    transition: width .18s ease;
}
.quiz-jump {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}
.quiz-jump button {
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    border-radius: 14px;
    color: var(--primary-dark);
    background: #fff;
    cursor: pointer;
    font-weight: 900;
}
.quiz-jump button.active {
    color: #fff;
    border-color: transparent;
    background: linear-gradient(135deg, var(--primary), var(--accent));
}
.quiz-jump button.answered {
    border-color: #bbf7d0;
    background: #dcfce7;
    color: var(--success);
}
.quiz-jump button.active.answered {
    color: #fff;
    background: linear-gradient(135deg, #16a34a, #22c55e);
}
.quiz-step {
    display: none;
}
.quiz-step.active {
    display: block;
    animation: quizFade .18s ease;
}
.quiz-step.needs-answer {
    border-color: #fca5a5;
    box-shadow: 0 0 0 4px rgba(239,68,68,.12);
}
.quiz-step.answered .option:has(input:checked) {
    border-color: #86efac;
    background: #f0fdf4;
}
.inline-context {
    margin: 0 0 16px;
}
.quiz-actions {
    position: sticky;
    bottom: 16px;
    z-index: 4;
    display: flex;
    justify-content: space-between;
    gap: 10px;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: rgba(255,255,255,.94);
    backdrop-filter: blur(14px);
    box-shadow: 0 14px 30px rgba(77, 46, 146, 0.12);
}
.quiz-actions .btn.primary {
    margin-left: auto;
}
.quiz-actions button:disabled {
    opacity: .45;
    cursor: not-allowed;
    transform: none;
}
@keyframes quizFade {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 900px) {
    .hero, .auth-grid, .grid-2, .assistant-layout, .course-card, .lesson-grid, .history-layout, .practice-grid, .analytics-grid { grid-template-columns: 1fr; }
    .cards-3, .stats-grid, .stats-grid.small, .flow-strip { grid-template-columns: 1fr; }
    .app-shell { grid-template-columns: 1fr; }
    .sidebar {
        position: sticky;
        top: 0;
        z-index: 30;
        height: auto;
        padding: 14px 16px;
        gap: 12px;
        border-right: 0;
        border-bottom: 1px solid var(--line);
    }
    .sidebar .brand { justify-content: center; }
    .side-nav {
        display: flex;
        gap: 8px;
        overflow-x: auto;
        padding-bottom: 4px;
        scrollbar-width: none;
    }
    .side-nav::-webkit-scrollbar { display: none; }
    .side-nav a {
        flex: 0 0 auto;
        white-space: nowrap;
        padding: 10px 12px;
        border-radius: 999px;
        background: #fff;
        border: 1px solid var(--line);
        box-shadow: none;
    }
    .side-nav a.active, .side-nav a:hover {
        color: #fff;
        background: linear-gradient(135deg, var(--primary), var(--accent));
        box-shadow: none;
    }
    .logout {
        position: absolute;
        top: 14px;
        right: 16px;
        margin: 0;
        width: 42px;
        height: 42px;
        padding: 0;
        justify-content: center;
        border-radius: 50%;
        background: #fff1f2;
        font-size: 0;
    }
    .logout i { font-size: 18px; }
    .main { max-width: none; padding: 18px; }
    .page-top {
        align-items: flex-start;
        flex-direction: column;
        gap: 10px;
    }
    .page-top h1 { font-size: 28px; }
    .topnav { display: none; }
    .learning-hero { align-items: flex-start; flex-direction: column; }
    .history-hero { align-items: flex-start; flex-direction: column; }
    .assistant-hero, .admin-analytics-hero { align-items: flex-start; flex-direction: column; }
    .admin-analytics-hero, .assistant-hero, .learning-hero, .learning-path-hero, .history-hero {
        padding: 22px;
        border-radius: 24px;
    }
    .report-head { align-items: flex-start; flex-direction: column; }
    .learning-path-hero { align-items: flex-start; flex-direction: column; }
    .path-node { grid-template-columns: 74px 1fr; gap: 14px; }
    .duo-path::before { left: 37px; transform: none; }
    .node-0 .node-button, .node-1 .node-button, .node-2 .node-button, .node-3 .node-button { grid-column: 1; }
    .node-0 .node-card, .node-1 .node-card, .node-2 .node-card, .node-3 .node-card { grid-column: 2; text-align: left; }
    .course-cover { min-height: 150px; }
    .landing-topbar { position: static; }
    .card-a, .card-b { position: static; margin: 12px 0; }
    .table-wrap { overflow-x: auto; }
    table { min-width: 760px; }
    .quiz-actions { flex-wrap: wrap; }
    .quiz-actions .btn { flex: 1; }
    .quiz-actions .btn.primary { flex-basis: 100%; }
}

@media (max-width: 640px) {
    body {
        background:
            radial-gradient(circle at top left, rgba(124, 58, 237, 0.14), transparent 20rem),
            linear-gradient(180deg, #fff 0%, var(--bg) 100%);
    }
    .topbar, .section, .hero {
        width: auto;
        margin-left: 12px;
        margin-right: 12px;
        padding-left: 0;
        padding-right: 0;
    }
    .topbar {
        align-items: flex-start;
        flex-direction: column;
        gap: 12px;
        padding: 14px;
    }
    .hero {
        margin-top: 34px;
        margin-bottom: 38px;
        gap: 24px;
    }
    .hero h1 { font-size: 42px; letter-spacing: -0.045em; }
    .hero p { font-size: 16px; }
    .hero-actions, .quick-links, .form-actions, .course-actions {
        align-items: stretch;
        flex-direction: column;
    }
    .hero-actions .btn, .quick-links .btn, .form-actions .btn, .course-actions .btn { width: 100%; }
    .landing-product { transform: none; }
    .hero-card, .mock-window, .card, .panel, .auth-card, .stat-card, .course-card {
        border-radius: 20px;
    }
    .panel { padding: 18px; margin-bottom: 16px; }
    .main { padding: 14px; }
    .sidebar {
        padding: 12px;
        border-radius: 0 0 22px 22px;
    }
    .sidebar .brand {
        width: calc(100% - 52px);
        justify-content: flex-start;
    }
    .side-nav a {
        min-height: 40px;
        padding: 9px 11px;
        font-size: 13px;
    }
    .side-nav a i, .logout i { font-size: 18px; }
    .user-pill {
        max-width: 100%;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }
    .section-head, .list-item {
        align-items: flex-start;
        flex-direction: column;
    }
    .progress { width: 100%; }
    .stats-grid { gap: 12px; }
    .stat-card {
        display: grid;
        grid-template-columns: 46px 1fr;
        gap: 10px 12px;
        align-items: center;
        padding: 16px;
    }
    .stat-card i { margin: 0; }
    .stat-card span { align-self: end; }
    .stat-card strong {
        grid-column: 2;
        margin: 0;
        font-size: 26px;
    }
    .learning-hero h2, .assistant-hero h2, .admin-analytics-hero h2, .learning-path-hero h2, .history-hero h2, .course-body h2 {
        font-size: 26px;
    }
    .analytics-score, .assistant-orb, .path-progress {
        width: 96px;
        height: 96px;
        border-radius: 26px;
    }
    .path-progress { border-radius: 50%; }
    .analytics-score strong, .path-progress strong { font-size: 25px; }
    .course-card { display: block; }
    .course-cover {
        min-height: 130px;
        border-radius: 20px 20px 0 0;
    }
    .course-body { padding: 18px; }
    .module-title {
        align-items: flex-start;
    }
    .lesson-card {
        grid-template-columns: 40px 1fr;
        padding: 14px;
    }
    .lesson-icon {
        width: 40px;
        height: 40px;
        font-size: 21px;
    }
    .practice-card {
        min-height: auto;
        padding: 18px;
    }
    .history-layout, .attempt-list, .answer-list { gap: 12px; }
    .attempt-card {
        grid-template-columns: 44px 1fr;
    }
    .attempt-card > strong { grid-column: 2; }
    .answer-row {
        grid-template-columns: 32px 1fr;
        gap: 10px;
    }
    .answer-number {
        width: 32px;
        height: 32px;
        border-radius: 11px;
    }
    .assistant-side { gap: 14px; }
    .chat-stream {
        min-height: 460px;
        max-height: none;
        padding: 16px;
    }
    .pro-chat .chat-message {
        max-width: 100%;
        grid-template-columns: 36px 1fr;
    }
    .message-avatar {
        width: 36px;
        height: 36px;
        border-radius: 13px;
    }
    .pro-chat-form {
        grid-template-columns: 1fr;
    }
    .profile-mini { grid-template-columns: 1fr; }
    .form-grid { grid-template-columns: 1fr; }
    input, select, textarea { padding: 11px 12px; }
    .modal-overlay {
        align-items: end;
        padding: 10px;
    }
    .modal-card {
        width: 100%;
        max-height: 90vh;
        overflow-y: auto;
        padding: 22px 18px;
        border-radius: 24px;
    }
    .modal-card h2 { font-size: 24px; padding-right: 36px; }
    .quiz-runner-top {
        top: 96px;
        padding: 12px;
        border-radius: 16px;
    }
    .quiz-runner-top h2 { font-size: 20px; }
    .quiz-jump {
        flex-wrap: nowrap;
        overflow-x: auto;
        padding-bottom: 4px;
        scrollbar-width: none;
    }
    .quiz-jump::-webkit-scrollbar { display: none; }
    .quiz-jump button {
        flex: 0 0 38px;
        width: 38px;
        height: 38px;
        border-radius: 12px;
    }
    .quiz-card, .context-box, .note, .answer-row, .module-block {
        padding: 15px;
        border-radius: 16px;
    }
    .option {
        padding: 12px;
        border-radius: 14px;
    }
    .quiz-actions {
        bottom: 10px;
        padding: 10px;
        border-radius: 16px;
    }
    .chart-panel canvas { max-height: 260px; }
}

@media (max-width: 420px) {
    .main { padding: 10px; }
    .page-top h1 { font-size: 24px; }
    .hero h1 { font-size: 36px; }
    .admin-analytics-hero, .assistant-hero, .learning-hero, .learning-path-hero, .history-hero {
        padding: 18px;
    }
    .path-node {
        grid-template-columns: 58px 1fr;
        gap: 10px;
    }
    .duo-path::before { left: 29px; width: 5px; }
    .node-button {
        width: 58px;
        height: 58px;
        border-width: 5px;
        font-size: 24px;
    }
    .node-card { padding: 13px; }
    .node-card h4 { font-size: 16px; }
    .sidebar .brand { font-size: 14px; }
    .side-nav a span { display: none; }
    .quiz-actions .btn {
        min-height: 40px;
        padding: 0 12px;
        font-size: 13px;
    }
}