/* ============================================================
   PYTHON STUDY HALL — Stylesheet
   ============================================================ */

:root {
  --color-black: #000000;
  --color-tan: #86745c;
  --color-light-tan: #c2baab;
  --color-dark-tan: #6a5c48;
  --color-white: #ffffff;
  --color-black-63: rgba(0, 0, 0, 0.63);
  --color-black-80: rgba(0, 0, 0, 0.8);
  --color-black-88: rgba(0, 0, 0, 0.88);
  --color-gold: #b19977;
  --color-accent: #b19977;
  --color-accent-light: #c2baab;

  --font-display: 'Space Grotesk', 'Segoe UI', sans-serif;
  --font-body: 'Inter', 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;

  --radius-md: 10px;
  --radius-lg: 16px;
  --border-hair: 1px solid rgba(194, 186, 171, 0.18);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  color: var(--color-white);
  background-color: var(--color-black);
  background-image:
    radial-gradient(circle at 14% 8%, rgba(177, 153, 119, 0.16), transparent 42%),
    radial-gradient(circle at 88% 18%, rgba(194, 186, 171, 0.10), transparent 38%),
    radial-gradient(circle at 50% 92%, rgba(106, 92, 72, 0.22), transparent 50%),
    linear-gradient(160deg, #050403 0%, #0d0b09 38%, #14100c 65%, #090807 100%);
  background-attachment: fixed;
  line-height: 1.5;
}

a { color: inherit; text-decoration: none; }

::selection { background: var(--color-accent); color: var(--color-black); }

/* Focus visibility for keyboard nav */
a:focus-visible,
button:focus-visible,
input:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--color-accent-light);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------------- Top bar ---------------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--color-black-80);
  backdrop-filter: blur(10px);
  border-bottom: var(--border-hair);
}

.topbar-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: 0.01em;
}

.brand-prompt {
  font-family: var(--font-mono);
  color: var(--color-accent-light);
  font-weight: 500;
}

.brand-sub {
  color: var(--color-light-tan);
  font-size: 0.72rem;
  font-family: var(--font-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.75;
}

.topnav {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.topnav a {
  font-size: 0.85rem;
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid transparent;
  color: var(--color-light-tan);
  transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}

.topnav a:hover,
.topnav a.active {
  color: var(--color-white);
  border-color: rgba(177, 153, 119, 0.45);
  background: rgba(177, 153, 119, 0.09);
}

/* ---------------- Hero ---------------- */

.hero {
  padding: 64px 0 40px;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  color: var(--color-accent-light);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
}

.cursor-blink {
  display: inline-block;
  width: 9px;
  height: 1.1em;
  background: var(--color-accent);
  animation: blink 1.1s steps(1) infinite;
  vertical-align: middle;
}

@keyframes blink {
  50% { opacity: 0; }
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 4.4vw, 3.4rem);
  line-height: 1.08;
  margin: 0 0 16px;
  letter-spacing: -0.01em;
}

.hero h1 span {
  color: var(--color-accent-light);
}

.hero p {
  max-width: 620px;
  color: var(--color-light-tan);
  font-size: 1.05rem;
  margin: 0 0 28px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* ---------------- Buttons ---------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.92rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.12s ease, background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: linear-gradient(135deg, var(--color-accent), var(--color-dark-tan));
  color: var(--color-black);
}
.btn-primary:hover { filter: brightness(1.08); }

.btn-ghost {
  background: transparent;
  border-color: rgba(194, 186, 171, 0.35);
  color: var(--color-white);
}
.btn-ghost:hover { border-color: var(--color-accent-light); background: rgba(177,153,119,0.08); }

.btn-block { width: 100%; justify-content: center; }
.btn[disabled] { opacity: 0.4; cursor: not-allowed; transform: none; }

/* ---------------- Section headers ---------------- */

.section-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin: 52px 0 20px;
}

.section-heading h2 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  margin: 0;
}

.section-heading .count {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-light-tan);
  opacity: 0.7;
}

/* ---------------- Test cards ---------------- */

.test-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.test-card {
  position: relative;
  border-radius: var(--radius-lg);
  border: var(--border-hair);
  background: linear-gradient(155deg, rgba(177,153,119,0.10), rgba(0,0,0,0.4));
  padding: 26px 24px 24px;
  overflow: hidden;
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.test-card:hover { border-color: rgba(177,153,119,0.55); transform: translateY(-2px); }

.test-card .tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent-light);
}

.test-card h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  margin: 8px 0 4px;
}

.test-card p {
  color: var(--color-light-tan);
  font-size: 0.88rem;
  margin: 0 0 18px;
}

/* ---------------- Section grid (Days) ---------------- */

.day-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 16px;
}

.day-card {
  border-radius: var(--radius-lg);
  border: var(--border-hair);
  background: rgba(255,255,255,0.02);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color 0.18s ease, transform 0.18s ease, background 0.18s ease;
}

.day-card:hover {
  border-color: rgba(177,153,119,0.5);
  background: rgba(177,153,119,0.06);
  transform: translateY(-2px);
}

.day-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.day-num {
  font-family: var(--font-mono);
  color: var(--color-accent-light);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
}

.day-count {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-light-tan);
  opacity: 0.65;
}

.day-card h3 {
  font-family: var(--font-display);
  font-size: 1.08rem;
  margin: 0;
  line-height: 1.3;
}

.day-card-links {
  margin-top: auto;
  display: flex;
  gap: 8px;
  padding-top: 6px;
}

.day-card-links a {
  flex: 1;
  text-align: center;
  font-size: 0.78rem;
  padding: 8px 6px;
  border-radius: 7px;
  border: 1px solid rgba(194,186,171,0.25);
  color: var(--color-light-tan);
  transition: all 0.15s ease;
}

.day-card-links a:hover {
  border-color: var(--color-accent-light);
  color: var(--color-white);
  background: rgba(177,153,119,0.1);
}

footer.site-footer {
  margin-top: 80px;
  padding: 28px 0 50px;
  text-align: center;
  color: var(--color-light-tan);
  opacity: 0.55;
  font-size: 0.8rem;
  font-family: var(--font-mono);
}

/* ============================================================
   SECTION PAGE (study.html) — flashcards + full list
   ============================================================ */

.section-title-block {
  padding: 40px 0 10px;
}

.section-title-block .breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-light-tan);
  opacity: 0.7;
  margin-bottom: 10px;
}

.section-title-block .breadcrumb a:hover { color: var(--color-accent-light); }

.section-title-block h1 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.4vw, 2.3rem);
  margin: 0 0 6px;
}

.section-jump {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin: 18px 0 6px;
}

.section-jump a {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid rgba(194,186,171,0.22);
  color: var(--color-light-tan);
}

.section-jump a.current {
  background: var(--color-accent);
  color: var(--color-black);
  border-color: var(--color-accent);
  font-weight: 700;
}

.section-jump a:hover:not(.current) {
  border-color: var(--color-accent-light);
  color: var(--color-white);
}

/* Tabs */

.mode-tabs {
  display: flex;
  gap: 4px;
  margin: 28px 0 26px;
  border-bottom: var(--border-hair);
}

.mode-tab {
  padding: 10px 18px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-light-tan);
  border-bottom: 2px solid transparent;
  cursor: pointer;
  background: none;
  border-top: none; border-left: none; border-right: none;
}

.mode-tab.active {
  color: var(--color-white);
  border-bottom-color: var(--color-accent);
}

.mode-panel { display: none; }
.mode-panel.active { display: block; }

/* Flashcard */

.flash-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 22px;
  flex-wrap: wrap;
}

.flash-progress {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-light-tan);
}

.flash-controls { display: flex; gap: 8px; }

.icon-btn {
  width: 40px; height: 40px;
  border-radius: 8px;
  border: 1px solid rgba(194,186,171,0.28);
  background: rgba(255,255,255,0.02);
  color: var(--color-white);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  font-size: 1rem;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.icon-btn:hover { border-color: var(--color-accent-light); background: rgba(177,153,119,0.1); }

.card-stage {
  perspective: 1600px;
  max-width: 640px;
  margin: 0 auto;
}

.flashcard {
  position: relative;
  height: 340px;
  cursor: pointer;
  transform-style: preserve-3d;
  transition: transform 0.5s cubic-bezier(.2,.8,.3,1);
}

.flashcard.flipped { transform: rotateY(180deg); }

.card-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: var(--radius-lg);
  border: var(--border-hair);
  padding: 32px;
  display: flex;
  flex-direction: column;
  background: linear-gradient(160deg, rgba(177,153,119,0.09), rgba(0,0,0,0.55));
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}

.card-face .win-dots {
  display: flex; gap: 6px; margin-bottom: 22px;
}
.win-dots span {
  width: 10px; height: 10px; border-radius: 50%;
  background: rgba(194,186,171,0.3);
}
.win-dots span:nth-child(1) { background: #86745c; }
.win-dots span:nth-child(2) { background: #c2baab; }
.win-dots span:nth-child(3) { background: #b19977; }

.card-face .face-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent-light);
  margin-bottom: 14px;
}

.card-face .face-body {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.card-front .face-body {
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 3vw, 1.9rem);
  font-weight: 500;
}

.card-back .face-body {
  font-family: var(--font-body);
  font-size: 1.15rem;
  color: var(--color-light-tan);
}

.card-back { transform: rotateY(180deg); }

.card-face .face-hint {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-light-tan);
  opacity: 0.5;
}

.flash-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-top: 26px;
}

.flash-nav .btn { min-width: 110px; justify-content: center; }

.kbd-hint {
  text-align: center;
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--color-light-tan);
  opacity: 0.55;
}

kbd {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 4px;
  padding: 1px 6px;
  font-family: var(--font-mono);
}

/* List mode */

.list-toolbar {
  margin-bottom: 20px;
}

.search-input {
  width: 100%;
  padding: 13px 16px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(194,186,171,0.28);
  background: rgba(255,255,255,0.03);
  color: var(--color-white);
  font-family: var(--font-body);
  font-size: 0.95rem;
}
.search-input::placeholder { color: rgba(194,186,171,0.55); }
.search-input:focus { border-color: var(--color-accent-light); outline: none; }

.term-list { display: flex; flex-direction: column; gap: 10px; }

.term-row {
  display: grid;
  grid-template-columns: 230px 1fr;
  gap: 18px;
  padding: 16px 18px;
  border-radius: 10px;
  border: var(--border-hair);
  background: rgba(255,255,255,0.015);
}

.term-row .t-term {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--color-accent-light);
}

.term-row .t-def {
  color: var(--color-light-tan);
  font-size: 0.94rem;
}

.term-row.hidden { display: none; }

.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--color-light-tan);
  opacity: 0.6;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

/* ============================================================
   TEST PAGE
   ============================================================ */

.test-header {
  padding: 40px 0 10px;
}

.test-header .breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-light-tan);
  opacity: 0.7;
  margin-bottom: 10px;
}

.test-header h1 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.4vw, 2.2rem);
  margin: 0 0 6px;
}

.test-header p { color: var(--color-light-tan); margin: 0; }

.test-meta-bar {
  display: flex;
  gap: 14px;
  align-items: center;
  flex-wrap: wrap;
  margin: 22px 0 30px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-light-tan);
}

.test-meta-bar .pill {
  border: 1px solid rgba(194,186,171,0.25);
  border-radius: 999px;
  padding: 5px 12px;
}

.progress-track {
  height: 6px;
  border-radius: 999px;
  background: rgba(255,255,255,0.06);
  overflow: hidden;
  margin-bottom: 34px;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-dark-tan), var(--color-accent));
  width: 0%;
  transition: width 0.25s ease;
}

.q-block {
  border-radius: var(--radius-lg);
  border: var(--border-hair);
  background: rgba(255,255,255,0.015);
  padding: 26px 26px 22px;
  margin-bottom: 18px;
}

.q-block .q-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-accent-light);
  margin-bottom: 10px;
  letter-spacing: 0.06em;
}

.q-block .q-prompt {
  font-size: 1.08rem;
  margin-bottom: 18px;
  line-height: 1.5;
}

.q-prompt .prompt-term {
  font-family: var(--font-mono);
  color: var(--color-accent-light);
  font-weight: 600;
}

.q-options { display: flex; flex-direction: column; gap: 10px; }

.q-option {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 13px 16px;
  border-radius: 9px;
  border: 1px solid rgba(194,186,171,0.22);
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.q-option:hover { border-color: rgba(177,153,119,0.55); background: rgba(177,153,119,0.06); }

.q-option input { margin-top: 3px; accent-color: var(--color-accent); }

.q-option .opt-text { font-size: 0.94rem; color: var(--color-light-tan); }

.q-option.selected { border-color: var(--color-accent); background: rgba(177,153,119,0.1); }
.q-option.selected .opt-text { color: var(--color-white); }

/* Graded states */
.q-option.correct-answer {
  border-color: #7fae6e;
  background: rgba(127, 174, 110, 0.12);
}
.q-option.correct-answer .opt-text { color: #b7d6ab; }

.q-option.wrong-answer {
  border-color: #b56a5c;
  background: rgba(181, 106, 92, 0.12);
}
.q-option.wrong-answer .opt-text { color: #e0b0a8; }

.q-block.graded .q-option { cursor: default; pointer-events: none; }

.submit-bar {
  position: sticky;
  bottom: 0;
  margin-top: 30px;
  padding: 18px 0 26px;
  background: linear-gradient(0deg, var(--color-black) 60%, transparent);
}

.submit-bar-inner {
  display: flex;
  justify-content: center;
}

/* Results */

.result-card {
  text-align: center;
  border-radius: var(--radius-lg);
  border: var(--border-hair);
  background: linear-gradient(160deg, rgba(177,153,119,0.12), rgba(0,0,0,0.5));
  padding: 44px 24px;
  margin: 20px 0 34px;
}

.result-score {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 8vw, 4rem);
  color: var(--color-accent-light);
  margin: 6px 0;
}

.result-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-light-tan);
}

.result-msg {
  margin-top: 10px;
  color: var(--color-light-tan);
  font-size: 1rem;
}

.result-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 22px;
  flex-wrap: wrap;
}

/* ---------------- Responsive ---------------- */

@media (max-width: 720px) {
  .test-grid { grid-template-columns: 1fr; }
  .term-row { grid-template-columns: 1fr; gap: 6px; }
  .topbar-inner { flex-direction: column; align-items: flex-start; gap: 10px; }
  .flashcard { height: 300px; }
}