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

/*
  Дизайн-система подобрана скиллом ui-ux-pro-max (DZEN.GURU) под запрос
  "study purple dashboard" / "Flashcard & Study Tool" — Flat Design,
  фиолетовый primary + зелёный accent (для "верно" в квизе).
*/
:root {
    color-scheme: light;

    --color-primary: #7c3aed;
    --color-primary-hover: #6d28d9;
    --color-on-primary: #ffffff;
    --color-secondary: #8b5cf6;
    --color-accent: #059669;
    --color-accent-hover: #047857;
    --color-on-accent: #ffffff;
    --color-destructive: #dc2626;
    --color-destructive-hover: #b91c1c;
    --color-on-destructive: #ffffff;

    --bg: #faf5ff;
    --surface: #ffffff;
    --surface-muted: #f7f3fd;
    --ink: #0f172a;
    --ink-soft: #64748b;
    --border: #efe7fc;
    --border-strong: #ddd0f7;
    --ring: #7c3aed;

    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 22px;
    --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 12px 32px rgba(76, 29, 149, 0.14);

    --font-sans: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 24px;
    --space-6: 32px;
    --space-7: 48px;
    --space-8: 64px;

    font-size: 16px;
}

:root[data-theme="dark"] {
    color-scheme: dark;
    --color-primary: #a78bfa;
    --color-primary-hover: #c4b5fd;
    --color-on-primary: #1e1235;
    --color-secondary: #8b5cf6;
    --color-accent: #34d399;
    --color-accent-hover: #6ee7b7;
    --color-on-accent: #08281c;
    --color-destructive: #f87171;
    --color-destructive-hover: #fca5a5;
    --color-on-destructive: #2a0a0a;

    --bg: #120c22;
    --surface: #1c1533;
    --surface-muted: #241a40;
    --ink: #f3eefe;
    --ink-soft: #b3a9d1;
    --border: #332a52;
    --border-strong: #453a6c;
    --ring: #a78bfa;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35);
    --shadow-md: 0 16px 40px rgba(0, 0, 0, 0.45);
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        color-scheme: dark;
        --color-primary: #a78bfa;
        --color-primary-hover: #c4b5fd;
        --color-on-primary: #1e1235;
        --color-secondary: #8b5cf6;
        --color-accent: #34d399;
        --color-accent-hover: #6ee7b7;
        --color-on-accent: #08281c;
        --color-destructive: #f87171;
        --color-destructive-hover: #fca5a5;
        --color-on-destructive: #2a0a0a;

        --bg: #120c22;
        --surface: #1c1533;
        --surface-muted: #241a40;
        --ink: #f3eefe;
        --ink-soft: #b3a9d1;
        --border: #332a52;
        --border-strong: #453a6c;
        --ring: #a78bfa;

        --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35);
        --shadow-md: 0 16px 40px rgba(0, 0, 0, 0.45);
    }
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: var(--font-sans);
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }

a { color: var(--color-primary); }

h1, h2, h3, h4 { line-height: 1.25; margin: 0 0 var(--space-2); font-weight: 700; }
p { margin: 0 0 var(--space-3); }

button, input, select, textarea { font-family: inherit; font-size: 1rem; }

:focus-visible {
    outline: 2px solid var(--ring);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 var(--space-5) var(--space-8);
}

/* --- Верхняя навигация --- */
.topbar {
    position: sticky;
    top: 0;
    z-index: 30;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    padding: var(--space-4) var(--space-5);
    background: color-mix(in srgb, var(--bg) 88%, transparent);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
}

.brand {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    text-decoration: none;
    color: var(--ink);
    font-weight: 800;
    font-size: 1.15rem;
}

.brand-mark {
    width: 34px;
    height: 34px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    flex-shrink: 0;
}

.topbar-user {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    color: var(--ink-soft);
    font-size: 0.92rem;
}

.icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--ink-soft);
    cursor: pointer;
    transition: background 150ms ease, color 150ms ease, border-color 150ms ease;
}
.icon-btn:hover { background: var(--surface-muted); color: var(--ink); }

/* --- Кнопки --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    min-height: 44px;
    padding: 0 var(--space-5);
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: background 150ms ease, border-color 150ms ease, transform 100ms ease, opacity 150ms ease;
    touch-action: manipulation;
}
.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.btn-primary { background: var(--color-primary); color: var(--color-on-primary); }
.btn-primary:hover:not(:disabled) { background: var(--color-primary-hover); }

.btn-accent { background: var(--color-accent); color: var(--color-on-accent); }
.btn-accent:hover:not(:disabled) { background: var(--color-accent-hover); }

.btn-secondary { background: var(--surface); color: var(--ink); border-color: var(--border-strong); }
.btn-secondary:hover:not(:disabled) { background: var(--surface-muted); }

.btn-ghost { background: transparent; color: var(--ink-soft); }
.btn-ghost:hover:not(:disabled) { background: var(--surface-muted); color: var(--ink); }

.btn-danger { background: transparent; color: var(--color-destructive); border-color: color-mix(in srgb, var(--color-destructive) 35%, transparent); }
.btn-danger:hover:not(:disabled) { background: color-mix(in srgb, var(--color-destructive) 10%, transparent); }

.btn-sm { min-height: 36px; padding: 0 var(--space-4); font-size: 0.86rem; }
.btn-block { width: 100%; }

/* --- Поля форм --- */
.field { margin-bottom: var(--space-4); text-align: left; }
.field label {
    display: block;
    font-size: 0.86rem;
    font-weight: 600;
    color: var(--ink-soft);
    margin-bottom: var(--space-2);
}
.field input, .field select, .field textarea {
    width: 100%;
    min-height: 44px;
    padding: 0 var(--space-4);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-strong);
    background: var(--surface);
    color: var(--ink);
}
.field textarea { padding: var(--space-3) var(--space-4); min-height: 120px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus {
    outline: 2px solid var(--ring);
    outline-offset: 1px;
    border-color: var(--ring);
}
.field-hint { font-size: 0.82rem; color: var(--ink-soft); margin-top: var(--space-1); }
.field-error {
    font-size: 0.86rem;
    color: var(--color-destructive);
    margin-top: var(--space-2);
    display: none;
}
.field-error.visible { display: block; }

/* --- Карточки --- */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

/* --- Экраны входа --- */
.auth-shell {
    min-height: 100dvh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-5);
}
.auth-card {
    width: 100%;
    max-width: 380px;
    padding: var(--space-6) var(--space-6) var(--space-5);
    text-align: center;
}
.auth-card .brand { justify-content: center; margin-bottom: var(--space-5); }
.auth-card h1 { font-size: 1.35rem; }
.auth-card p.subtitle { color: var(--ink-soft); margin-bottom: var(--space-5); font-size: 0.92rem; }

/* --- Сетка предметов --- */
.page-header {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: var(--space-4);
    flex-wrap: wrap;
    padding-top: var(--space-6);
    margin-bottom: var(--space-5);
}
.page-header h1 { font-size: 1.6rem; }
.page-header p { color: var(--ink-soft); margin: 0; }

.subjects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: var(--space-4);
}

.subject-card {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    padding: var(--space-5);
    text-decoration: none;
    color: var(--ink);
    transition: transform 150ms ease, box-shadow 150ms ease, border-color 150ms ease;
}
.subject-card:hover { box-shadow: var(--shadow-md); border-color: var(--border-strong); transform: translateY(-2px); }

.subject-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 700;
    font-size: 1.1rem;
    flex-shrink: 0;
}
.subject-card h3 { font-size: 1.05rem; margin: 0; }
.subject-meta { color: var(--ink-soft); font-size: 0.85rem; margin: 0; }

.subject-remove {
    position: absolute;
    top: var(--space-3);
    right: var(--space-3);
    opacity: 0;
    transition: opacity 150ms ease;
}
.subject-card:hover .subject-remove, .subject-remove:focus-visible { opacity: 1; }

.add-subject-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    min-height: 148px;
    border: 2px dashed var(--border-strong);
    border-radius: var(--radius-lg);
    background: transparent;
    color: var(--ink-soft);
    cursor: pointer;
    transition: border-color 150ms ease, color 150ms ease, background 150ms ease;
}
.add-subject-card:hover { border-color: var(--color-primary); color: var(--color-primary); background: var(--surface-muted); }

/* --- Учебники предмета --- */
.textbooks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
    gap: var(--space-4);
}
.textbook-card {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    text-decoration: none;
    color: var(--ink);
    transition: transform 150ms ease, box-shadow 150ms ease;
}
.textbook-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.textbook-cover {
    aspect-ratio: 3 / 4;
    background: var(--surface-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--ink-soft);
    border-bottom: 1px solid var(--border);
}
.textbook-cover canvas, .textbook-cover img { width: 100%; height: 100%; object-fit: cover; }
.textbook-info { padding: var(--space-3) var(--space-4) var(--space-4); }
.textbook-info h4 { font-size: 0.95rem; margin: 0 0 var(--space-1); }
.textbook-info p { font-size: 0.82rem; color: var(--ink-soft); margin: 0; }
.textbook-status {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    font-size: 0.78rem;
    font-weight: 600;
    padding: 2px 10px;
    border-radius: 999px;
    background: var(--surface-muted);
    color: var(--ink-soft);
}
.textbook-status.processing { color: var(--color-primary); background: color-mix(in srgb, var(--color-primary) 12%, transparent); }
.textbook-status.error { color: var(--color-destructive); background: color-mix(in srgb, var(--color-destructive) 12%, transparent); }

/* --- Загрузка PDF --- */
.upload-zone {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    text-align: center;
    padding: var(--space-7) var(--space-5);
    border: 2px dashed var(--border-strong);
    border-radius: var(--radius-lg);
    color: var(--ink-soft);
    transition: border-color 150ms ease, background 150ms ease;
    cursor: pointer;
}
.upload-zone.dragover { border-color: var(--color-primary); background: var(--surface-muted); color: var(--color-primary); }
.upload-zone input[type="file"] { display: none; }

/* --- Пустые состояния --- */
.empty-state {
    text-align: center;
    padding: var(--space-8) var(--space-5);
    color: var(--ink-soft);
}
.empty-state svg { margin: 0 auto var(--space-3); color: var(--border-strong); }

/* --- Модалки --- */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 10, 30, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
    z-index: 100;
    opacity: 0;
    pointer-events: none;
    transition: opacity 200ms ease;
}
.modal-overlay.open { opacity: 1; pointer-events: auto; }
.modal {
    width: 100%;
    max-width: 440px;
    max-height: 88vh;
    overflow-y: auto;
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--space-5);
    transform: translateY(12px) scale(0.98);
    transition: transform 200ms ease;
}
.modal-overlay.open .modal { transform: translateY(0) scale(1); }
.modal.modal-lg { max-width: 640px; }
.modal-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--space-4); }
.modal-header h2 { font-size: 1.15rem; margin: 0; }
.modal-actions { display: flex; justify-content: flex-end; gap: var(--space-3); margin-top: var(--space-5); }

/* --- Тосты --- */
.toast-stack {
    position: fixed;
    bottom: var(--space-5);
    right: var(--space-5);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    z-index: 200;
}
.toast {
    background: var(--ink);
    color: var(--bg);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
    font-size: 0.9rem;
    max-width: 320px;
    animation: toast-in 200ms ease;
}
.toast.toast-error { background: var(--color-destructive); color: var(--color-on-destructive); }
@keyframes toast-in { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

/* --- Спиннер --- */
.spinner {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    border: 3px solid color-mix(in srgb, currentColor 25%, transparent);
    border-top-color: currentColor;
    animation: spin 700ms linear infinite;
    flex-shrink: 0;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* --- Утилиты --- */
.color-swatch {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
}
.color-swatch.selected { border-color: var(--ink); }
.color-swatch-row { display: flex; flex-wrap: wrap; gap: var(--space-2); }

.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    font-size: 0.78rem;
    font-weight: 600;
    padding: 2px 10px;
    border-radius: 999px;
}

.skeleton {
    background: linear-gradient(90deg, var(--surface-muted) 25%, var(--border) 37%, var(--surface-muted) 63%);
    background-size: 400% 100%;
    animation: skeleton-shine 1.4s ease infinite;
    border-radius: var(--radius-sm);
}
@keyframes skeleton-shine { 0% { background-position: 100% 50%; } 100% { background-position: 0 50%; } }

/* --- Эффект при выборе карточки: человечек отстреливает остальные --- */
.card-busy { pointer-events: none; }

.card-spared {
    box-shadow:
        0 0 0 3px color-mix(in srgb, var(--card-accent, var(--color-primary)) 55%, transparent),
        0 14px 32px -6px color-mix(in srgb, var(--card-accent, var(--color-primary)) 35%, transparent);
}

.shatter-wrapper {
    position: fixed;
    z-index: 900;
    pointer-events: none;
    overflow: visible;
}
.shatter-piece {
    position: absolute;
    left: 0;
    top: 0;
    pointer-events: none;
    margin: 0 !important;
}

.gunman-layer {
    position: fixed;
    bottom: 24px;
    right: -160px;
    z-index: 1300;
    pointer-events: none;
    transform: scaleX(-1);
    transition: right 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.gunman-layer.gunman-in { right: 24px; }

.gunman-muzzle-flash { opacity: 0; }
.gunman-muzzle-flash.flash { opacity: 1; }

@media (prefers-reduced-motion: reduce) {
    .gunman-layer { transition: none !important; }
}

@media (max-width: 640px) {
    .container { padding: 0 var(--space-4) var(--space-7); }
    .page-header { padding-top: var(--space-5); }
}