/* Google Fonts — must come before the Tailwind import */
@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Lora:wght@600;700&display=swap");

@import "tailwindcss";

/* =============================================================================
   Mr. Drew's Assignment Creator — design system
   Identity: a well-kept teacher's desk. Lora serif headings, chalkboard
   green for primary actions, and the signature: everything answer-key wears
   red pen — the color teachers actually grade in.
   ============================================================================= */

@layer base {
  :root {
    /* palette */
    --paper: #f0f4f1;
    --panel: #ffffff;
    --ink: #1e2d28;
    --ink-soft: #58706a;
    --board: #2f6b58;
    --board-deep: #245546;
    --board-tint: #e4eeea;
    --board-glow: rgba(47, 107, 88, 0.12);
    --redpen: #b8412f;
    --redpen-tint: #faece9;
    --gold: #b98a23;
    --gold-tint: #faf3e2;
    --line: #dde4df;
    --line-strong: #c5d0cb;
    --field-bg: #ffffff;
    --hover-bg: #f2f6f4;
    --tab-track: #e6ecea;
    --chip-neutral-bg: #eaeeec;
    --empty-bg: #fafcfb;
    --shadow-sm: 0 1px 3px rgba(34, 49, 44, 0.07), 0 2px 8px rgba(34, 49, 44, 0.05);
    --shadow: 0 2px 6px rgba(34, 49, 44, 0.06), 0 6px 20px rgba(34, 49, 44, 0.07);
    --shadow-lg: 0 8px 32px rgba(34, 49, 44, 0.12), 0 2px 8px rgba(34, 49, 44, 0.06);
    color-scheme: light;

    /* type */
    --font-display: "Lora", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
    --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, "Cascadia Mono", Consolas, Menlo, monospace;

    --radius: 12px;
    --radius-sm: 8px;
    --radius-xs: 5px;
    --transition: 0.18s ease;
    --transition-fast: 0.1s ease;
  }

  /* The same desk after dark */
  html[data-theme="dark"] {
    --paper: #111815;
    --panel: #1b2320;
    --ink: #e2eae5;
    --ink-soft: #92aaa2;
    --board: #4d9c82;
    --board-deep: #7bc0a8;
    --board-tint: #1e3028;
    --board-glow: rgba(77, 156, 130, 0.15);
    --redpen: #e07a63;
    --redpen-tint: #38221e;
    --gold: #d3a94c;
    --gold-tint: #342d1a;
    --line: #263028;
    --line-strong: #374440;
    --field-bg: #151c18;
    --hover-bg: #1f2a26;
    --tab-track: #161d1a;
    --chip-neutral-bg: #262f2b;
    --empty-bg: #171e1a;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3), 0 2px 8px rgba(0, 0, 0, 0.25);
    --shadow: 0 2px 6px rgba(0, 0, 0, 0.3), 0 6px 20px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4), 0 2px 8px rgba(0, 0, 0, 0.3);
    color-scheme: dark;
  }

  html[data-theme="dark"] .alert-error { border-color: #5a2f26; color: #f0a795; }
  html[data-theme="dark"] .alert-warn { border-color: #564820; color: #e2c47e; }
  html[data-theme="dark"] .alert-info { border-color: #2d5040; color: #8dcbb5; }
  html[data-theme="dark"] .toast { background: #e2eae5; color: #111815; }
  html[data-theme="dark"] .brand-mark { color: #f1f5f2; }
  html[data-theme="dark"] .nav-scrolled { box-shadow: 0 4px 24px rgba(0,0,0,0.5); }

  * { box-sizing: border-box; }

  html, body {
    margin: 0;
    padding: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: var(--font-body);
    font-size: 15.5px;
    line-height: 1.58;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }

  h1, h2, h3 {
    font-family: var(--font-display);
    font-weight: 700;
    letter-spacing: -0.01em;
    margin: 0;
    line-height: 1.25;
  }
  h1 { font-size: 1.85rem; }
  h2 { font-size: 1.3rem; }
  h3 { font-size: 1.08rem; }

  a { color: var(--board); text-decoration: none; }
  a:hover { text-decoration: underline; }

  :focus-visible {
    outline: 2px solid var(--board);
    outline-offset: 2px;
    border-radius: 4px;
  }

  @media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation: none !important; transition: none !important; }
  }
}

/* =====================================================================
   KEYFRAME ANIMATIONS
   ===================================================================== */

@keyframes spin { to { transform: rotate(360deg); } }

@keyframes fade-in-up {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes slide-up {
  from { opacity: 0; transform: translate(-50%, 12px); }
  to   { opacity: 1; transform: translate(-50%, 0); }
}

@keyframes step-complete {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.2); }
  100% { transform: scale(1); }
}

@keyframes skeleton-pulse {
  0%, 100% { opacity: 0.55; }
  50%       { opacity: 1; }
}

@keyframes progress-fill {
  from { width: 0%; }
  to   { width: 100%; }
}

@keyframes spin-ring {
  0%   { transform: rotate(0deg); stroke-dashoffset: 60; }
  50%  { stroke-dashoffset: 15; }
  100% { transform: rotate(360deg); stroke-dashoffset: 60; }
}

/* =====================================================================
   LAYOUT SHELL
   ===================================================================== */

@layer components {
  .shell { max-width: 1020px; margin: 0 auto; padding: 32px 22px 90px; }

  /* ---------- navigation ---------- */
  .topnav {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--line);
    position: sticky; top: 0; z-index: 50;
    transition: box-shadow var(--transition);
  }
  html[data-theme="dark"] .topnav {
    background: rgba(27, 35, 32, 0.85);
  }
  .topnav.nav-scrolled {
    box-shadow: 0 4px 24px rgba(34, 49, 44, 0.1);
    border-bottom-color: var(--line-strong);
  }
  .topnav-inner {
    max-width: 1020px; margin: 0 auto; padding: 0 22px;
    display: flex; align-items: center; gap: 24px; height: 60px;
  }
  .brand {
    font-family: var(--font-display); font-size: 1.08rem; font-weight: 700; color: var(--ink);
    display: flex; align-items: center; gap: 10px; white-space: nowrap;
  }
  .brand:hover { text-decoration: none; }
  .brand-mark {
    width: 30px; height: 30px; border-radius: 8px;
    background: linear-gradient(135deg, var(--board) 0%, var(--board-deep) 100%);
    color: #fff;
    display: inline-flex; align-items: center; justify-content: center;
    font-size: 15px; flex: none;
    box-shadow: 0 2px 6px rgba(47, 107, 88, 0.35);
  }
  .navlinks { display: flex; gap: 2px; margin-left: auto; }
  .theme-toggle {
    flex: none; width: 36px; height: 36px; border-radius: 9px;
    font-size: 1rem; transition: background var(--transition), transform var(--transition-fast);
  }
  .theme-toggle:hover { transform: rotate(18deg); }
  .navlink {
    padding: 7px 14px; border-radius: var(--radius-sm); color: var(--ink-soft);
    font-weight: 500; font-size: 0.93rem; transition: background var(--transition), color var(--transition);
  }
  .navlink:hover { background: var(--hover-bg); color: var(--ink); text-decoration: none; }
  .navlink.active { background: var(--board-tint); color: var(--board-deep); font-weight: 600; }

  /* ---------- cards & panels ---------- */
  .card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    padding: 24px;
    transition: box-shadow var(--transition), border-color var(--transition), transform 0.2s ease;
    animation: fade-in-up 0.3s ease both;
  }
  .card + .card { margin-top: 16px; }
  .card:hover { box-shadow: var(--shadow); }

  .card-lift:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
    border-color: var(--line-strong);
  }

  .page-head { margin: 4px 0 24px; }
  .page-head p { color: var(--ink-soft); margin: 8px 0 0; max-width: 62ch; font-size: 0.97rem; }

  /* ---------- buttons ---------- */
  .btn {
    appearance: none;
    border: 1px solid var(--line-strong);
    background: var(--panel);
    color: var(--ink);
    font: inherit; font-family: var(--font-body); font-weight: 600; font-size: 0.92rem;
    padding: 9px 17px; border-radius: var(--radius-sm); cursor: pointer;
    display: inline-flex; align-items: center; gap: 7px;
    transition: background var(--transition), border-color var(--transition), box-shadow var(--transition), transform var(--transition-fast);
    white-space: nowrap; user-select: none;
  }
  .btn:hover {
    background: var(--hover-bg);
    border-color: var(--board);
    box-shadow: 0 1px 4px var(--board-glow);
  }
  .btn:active { transform: translateY(1px); box-shadow: none; }
  .btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none; box-shadow: none; }

  .btn-primary {
    background: var(--board);
    border-color: var(--board);
    color: #fff;
    box-shadow: 0 2px 6px rgba(47, 107, 88, 0.25);
  }
  .btn-primary:hover {
    background: var(--board-deep);
    border-color: var(--board-deep);
    box-shadow: 0 4px 14px rgba(47, 107, 88, 0.35);
  }

  .btn-danger { color: var(--redpen); border-color: var(--line-strong); }
  .btn-danger:hover { background: var(--redpen-tint); border-color: var(--redpen); box-shadow: none; }

  .btn-sm { padding: 5px 11px; font-size: 0.84rem; border-radius: var(--radius-xs); }
  .btn-lg { padding: 12px 26px; font-size: 1rem; border-radius: var(--radius); }

  /* ---------- forms ---------- */
  label.field { display: block; margin-bottom: 14px; }
  .field-label { display: block; font-weight: 600; font-size: 0.87rem; margin-bottom: 5px; color: var(--ink); letter-spacing: 0.01em; }
  .field-hint { font-size: 0.82rem; color: var(--ink-soft); margin-top: 5px; line-height: 1.5; }

  input[type="text"], input[type="password"], input[type="number"], input[type="url"], select, textarea {
    width: 100%;
    font: inherit;
    font-family: var(--font-body);
    color: var(--ink);
    background: var(--field-bg);
    border: 1.5px solid var(--line-strong);
    border-radius: var(--radius-sm);
    padding: 9px 12px;
    transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
  }
  input:focus, select:focus, textarea:focus {
    border-color: var(--board);
    outline: none;
    box-shadow: 0 0 0 3px var(--board-glow);
    background: var(--field-bg);
  }
  textarea { resize: vertical; min-height: 80px; }

  .row { display: flex; gap: 14px; flex-wrap: wrap; }
  .row > * { flex: 1; min-width: 180px; }

  .check {
    display: flex; align-items: flex-start; gap: 10px; margin: 10px 0; cursor: pointer;
    padding: 8px 10px; border-radius: var(--radius-xs); transition: background var(--transition);
  }
  .check:hover { background: var(--hover-bg); }
  .check input { width: 16px; height: 16px; margin-top: 3px; accent-color: var(--board); cursor: pointer; flex: none; }
  .check span { font-size: 0.94rem; }
  .check small { display: block; color: var(--ink-soft); }

  /* ---------- step tabs (Create flow) ---------- */
  .steps {
    display: flex; gap: 0;
    border-bottom: 1.5px solid var(--line);
    margin-bottom: 24px;
    overflow: hidden;
  }
  .step {
    display: flex; align-items: center; gap: 10px;
    padding: 12px 20px 13px; margin-bottom: -1.5px;
    border-bottom: 2.5px solid transparent;
    color: var(--ink-soft); font-weight: 500; font-size: 0.93rem;
    background: none; border-top: 0; border-left: 0; border-right: 0;
    cursor: pointer; font-family: var(--font-body);
    transition: color var(--transition), border-color var(--transition);
  }
  .step .step-n {
    width: 24px; height: 24px; border-radius: 50%; flex: none;
    border: 2px solid currentColor;
    display: inline-flex; align-items: center; justify-content: center;
    font-size: 0.78rem; font-weight: 700;
    transition: background var(--transition), border-color var(--transition), transform 0.2s ease;
  }
  .step.active { color: var(--board-deep); border-bottom-color: var(--board); font-weight: 600; }
  .step.done { color: var(--board); }
  .step.done .step-n {
    background: var(--board); border-color: var(--board); color: #fff;
    animation: step-complete 0.3s ease;
  }
  .step:disabled { cursor: default; opacity: 0.5; }

  /* ---------- choice cards ---------- */
  .choice-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 10px; }
  .choice {
    border: 1.5px solid var(--line-strong); border-radius: var(--radius); background: var(--field-bg);
    padding: 14px 15px; cursor: pointer; text-align: left; font: inherit; font-family: var(--font-body);
    transition: border-color var(--transition), background var(--transition), box-shadow var(--transition), transform 0.15s ease;
  }
  .choice:hover { border-color: var(--board); box-shadow: 0 2px 10px var(--board-glow); transform: translateY(-1px); }
  .choice.selected { border-color: var(--board); background: var(--board-tint); box-shadow: 0 2px 10px var(--board-glow); }
  .choice b { display: block; font-size: 0.93rem; font-weight: 600; }
  .choice small { color: var(--ink-soft); font-size: 0.79rem; line-height: 1.35; display: block; margin-top: 4px; }

  /* ---------- tabs (source input) ---------- */
  .tabs {
    display: inline-flex; background: var(--tab-track);
    border-radius: var(--radius-sm); padding: 3px; gap: 2px; margin-bottom: 16px;
  }
  .tab {
    border: 0; background: none; font: inherit; font-family: var(--font-body);
    font-weight: 600; font-size: 0.88rem;
    padding: 7px 16px; border-radius: 6px; cursor: pointer; color: var(--ink-soft);
    transition: background var(--transition), color var(--transition), box-shadow var(--transition);
  }
  .tab.active {
    background: var(--panel); color: var(--ink);
    box-shadow: var(--shadow-sm);
  }

  /* ---------- badges & chips ---------- */
  .chip {
    display: inline-flex; align-items: center; gap: 5px;
    font-size: 0.73rem; font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase;
    padding: 3px 10px; border-radius: 99px;
    background: var(--board-tint); color: var(--board-deep);
  }
  .chip-neutral { background: var(--chip-neutral-bg); color: var(--ink-soft); }

  .stamp {
    display: inline-flex; align-items: center; gap: 5px;
    font-family: var(--font-mono); font-size: 0.71rem; font-weight: 700;
    letter-spacing: 0.08em; text-transform: uppercase;
    padding: 3px 8px; border: 1.5px solid currentColor; border-radius: 4px;
    transform: rotate(-1.2deg);
  }
  .stamp-pass { color: var(--board); background: rgba(47, 107, 88, 0.06); }
  .stamp-warn { color: var(--gold); background: var(--gold-tint); transform: rotate(1deg); }

  /* ---------- answer key (red pen) ---------- */
  .answer-key {
    margin-top: 14px; padding: 13px 15px;
    background: var(--redpen-tint);
    border-left: 3px solid var(--redpen);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  }
  .answer-key .ak-label {
    font-family: var(--font-mono); font-size: 0.69rem; font-weight: 700;
    letter-spacing: 0.1em; text-transform: uppercase; color: var(--redpen);
    display: block; margin-bottom: 6px;
  }
  .answer-key, .answer-key textarea, .answer-key input { font-size: 0.92rem; }
  .redpen { color: var(--redpen); font-weight: 600; }

  /* ---------- question cards ---------- */
  .qcard { position: relative; }
  .qcard-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 14px; }
  .qnum { font-family: var(--font-display); font-size: 1.15rem; font-weight: 700; color: var(--board-deep); min-width: 28px; }
  .qcard-actions { margin-left: auto; display: flex; gap: 6px; flex-wrap: wrap; }
  .icon-btn {
    border: 1px solid var(--line); background: var(--field-bg); border-radius: 7px;
    width: 32px; height: 32px; cursor: pointer; font-size: 0.93rem; line-height: 1;
    display: inline-flex; align-items: center; justify-content: center; color: var(--ink-soft);
    transition: background var(--transition), border-color var(--transition), color var(--transition), transform var(--transition-fast);
  }
  .icon-btn:hover { border-color: var(--board); color: var(--ink); background: var(--board-tint); transform: scale(1.05); }
  .icon-btn:disabled { opacity: 0.3; cursor: default; transform: none; }
  .icon-btn.danger:hover { border-color: var(--redpen); color: var(--redpen); background: var(--redpen-tint); }

  .opt-row { display: flex; align-items: center; gap: 9px; margin: 7px 0; }
  .opt-row input[type="radio"] { accent-color: var(--redpen); width: 16px; height: 16px; flex: none; cursor: pointer; }
  .opt-letter { font-weight: 700; font-size: 0.84rem; color: var(--ink-soft); width: 18px; flex: none; }
  .points-input { width: 64px !important; text-align: center; }

  /* ---------- alerts & toasts ---------- */
  .alert {
    padding: 13px 16px; border-radius: var(--radius-sm); font-size: 0.92rem;
    margin: 14px 0; border: 1px solid;
    animation: fade-in 0.2s ease;
  }
  .alert-error { background: var(--redpen-tint); border-color: #e8c5be; color: #8c3022; }
  .alert-warn { background: var(--gold-tint); border-color: #e9d8a6; color: #7a5a14; }
  .alert-info { background: var(--board-tint); border-color: #cde0d8; color: var(--board-deep); }

  .toast {
    position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
    background: var(--ink); color: #fff;
    padding: 11px 22px; border-radius: 99px;
    font-size: 0.91rem; font-weight: 600;
    box-shadow: 0 8px 30px rgba(0,0,0,0.3);
    z-index: 100;
    animation: slide-up 0.22s cubic-bezier(0.34, 1.56, 0.64, 1) both;
    white-space: nowrap;
  }

  /* ---------- spinner ---------- */
  .spinner {
    width: 16px; height: 16px; border-radius: 50%; flex: none;
    border: 2px solid rgba(47, 107, 88, 0.22);
    border-top-color: var(--board);
    animation: spin 0.7s linear infinite;
    display: inline-block; vertical-align: -3px;
  }

  /* ---------- generation progress ---------- */
  .progress-list { list-style: none; margin: 22px 0 0; padding: 0; }
  .progress-list li {
    display: flex; align-items: center; gap: 12px;
    padding: 11px 0; font-size: 0.97rem; color: var(--ink-soft);
    border-bottom: 1px solid var(--line);
    opacity: 0;
    animation: fade-in-up 0.35s ease forwards;
  }
  .progress-list li:last-child { border-bottom: none; }
  .progress-list li:nth-child(1) { animation-delay: 0.0s; }
  .progress-list li:nth-child(2) { animation-delay: 0.08s; }
  .progress-list li:nth-child(3) { animation-delay: 0.16s; }
  .progress-list li:nth-child(4) { animation-delay: 0.24s; }
  .progress-list li.active { color: var(--ink); font-weight: 600; }
  .progress-list li.done { color: var(--board); }
  .progress-dot { width: 20px; text-align: center; flex: none; font-size: 1rem; }

  /* ---------- library ---------- */
  .lib-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(276px, 1fr)); gap: 16px; }
  .lib-card { animation: fade-in-up 0.35s ease both; }
  .lib-card:nth-child(2) { animation-delay: 0.06s; }
  .lib-card:nth-child(3) { animation-delay: 0.12s; }
  .lib-card:nth-child(4) { animation-delay: 0.18s; }
  .lib-card:nth-child(5) { animation-delay: 0.24s; }
  .lib-card:nth-child(6) { animation-delay: 0.30s; }
  .lib-card h3 { margin-bottom: 6px; }
  .lib-meta { color: var(--ink-soft); font-size: 0.83rem; margin: 3px 0 14px; line-height: 1.55; }
  .lib-actions { display: flex; gap: 7px; }

  /* Skeleton loader */
  .skeleton-card { animation: skeleton-pulse 1.5s ease-in-out infinite; }
  .skeleton-line {
    background: var(--line); border-radius: 5px; height: 14px; margin-bottom: 10px;
  }
  .skeleton-line.short { width: 55%; }
  .skeleton-line.medium { width: 75%; }
  .skeleton-line.full { width: 100%; }
  .skeleton-chip { background: var(--line); border-radius: 99px; height: 20px; width: 64px; margin-bottom: 12px; }

  .empty {
    text-align: center; padding: 60px 24px; color: var(--ink-soft);
    border: 1.5px dashed var(--line-strong); border-radius: var(--radius);
    background: var(--empty-bg);
    animation: fade-in 0.3s ease;
  }
  .empty h3 { color: var(--ink); margin-bottom: 8px; }

  /* ---------- provider cards on settings ---------- */
  .provider-row {
    display: flex; align-items: center; gap: 12px;
    padding: 13px 15px; border: 1.5px solid var(--line-strong);
    border-radius: var(--radius); cursor: pointer; background: var(--field-bg);
    margin-bottom: 10px;
    transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
  }
  .provider-row:hover { border-color: var(--board); background: var(--hover-bg); }
  .provider-row.selected { border-color: var(--board); background: var(--board-tint); box-shadow: 0 2px 8px var(--board-glow); }
  .provider-row input { accent-color: var(--board); width: 17px; height: 17px; flex: none; }
  .provider-row b { font-size: 0.96rem; }
  .provider-row small { color: var(--ink-soft); display: block; }
  .local-tag { margin-left: auto; }

  /* ---------- misc helpers ---------- */
  .muted { color: var(--ink-soft); }
  .small { font-size: 0.84rem; }
  .spacer { flex: 1; }
  .hr { border: 0; border-top: 1px solid var(--line); margin: 20px 0; }

  @media (max-width: 640px) {
    .shell { padding: 20px 15px 74px; }
    .topnav-inner { gap: 10px; padding: 0 15px; }
    .brand span.brand-text { display: none; }
    .card { padding: 18px; }
    .steps { overflow-x: auto; }
    h1 { font-size: 1.5rem; }
  }
}