/* ==========================================================================
   1. Design System, Apple Glass Tokens & Resets
   ========================================================================== */
:root {
  /* Apple Dark Ambient Canvas */
  --bg-base: #090c10;
  --bg:
    radial-gradient(at 0% 0%, rgba(31, 46, 77, 0.45) 0px, transparent 55%),
    radial-gradient(at 100% 0%, rgba(56, 36, 75, 0.35) 0px, transparent 50%),
    radial-gradient(at 50% 100%, rgba(20, 35, 60, 0.4) 0px, transparent 60%),
    #090d14;

  /* Specular Glass Layers */
  --glass-panel: rgba(22, 27, 34, 0.48);
  --glass-panel-elevated: rgba(30, 38, 51, 0.58);
  --glass-sidebar: rgba(13, 17, 23, 0.72);
  --glass-input: rgba(10, 14, 20, 0.65);

  /* Light Edge Reflex (Chamfered Glass Edge) */
  --glass-border: 1px solid rgba(255, 255, 255, 0.1);
  --glass-border-subtle: 1px solid rgba(255, 255, 255, 0.05);
  --glass-specular:
    inset 0 1px 1px 0 rgba(255, 255, 255, 0.18),
    inset 0 -1px 1px 0 rgba(0, 0, 0, 0.25), 0 12px 36px 0 rgba(0, 0, 0, 0.45);

  /* Apple Heavy Glass Refraction */
  --apple-blur: blur(28px) saturate(200%);

  /* Ink & Accents */
  --ink: #f0f6fc;
  --muted: #919bb0;
  --line: rgba(255, 255, 255, 0.08);
  --accent: #58a6ff;
  --accent-soft: rgba(88, 166, 255, 0.16);
  --accent-glow: 0 0 20px rgba(88, 166, 255, 0.3);
  --green: #3fb950;
  --green-soft: rgba(63, 185, 80, 0.18);
  --red: #f85149;
  --red-soft: rgba(248, 81, 73, 0.18);
  --amber: #d29922;
  --amber-soft: rgba(210, 153, 34, 0.18);

  --font-mono:
    ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

[data-theme="light"] {
  --bg-base: #f0f2f6;
  --bg:
    radial-gradient(at 0% 0%, rgba(210, 225, 255, 0.8) 0px, transparent 60%),
    radial-gradient(at 100% 0%, rgba(240, 220, 255, 0.7) 0px, transparent 50%),
    #eef1f6;

  --glass-panel: rgba(255, 255, 255, 0.65);
  --glass-panel-elevated: rgba(255, 255, 255, 0.85);
  --glass-sidebar: rgba(245, 247, 250, 0.8);
  --glass-input: rgba(255, 255, 255, 0.75);

  --glass-border: 1px solid rgba(255, 255, 255, 0.75);
  --glass-border-subtle: 1px solid rgba(0, 0, 0, 0.06);
  --glass-specular:
    inset 0 1px 1px 0 rgba(255, 255, 255, 0.9),
    0 10px 30px rgba(30, 40, 60, 0.08);

  --apple-blur: blur(28px) saturate(180%);
  --ink: #111827;
  --muted: #6b7280;
  --line: rgba(0, 0, 0, 0.08);
  --accent: #0071e3;
  --accent-soft: rgba(0, 113, 227, 0.1);
  --accent-glow: 0 0 16px rgba(0, 113, 227, 0.2);
  --green: #248a3d;
  --green-soft: rgba(36, 138, 61, 0.12);
  --red: #d70015;
  --red-soft: rgba(215, 0, 21, 0.1);
  --amber: #b25000;
  --amber-soft: rgba(178, 80, 0, 0.12);
}

* {
  box-sizing: border-box;
  transition:
    background-color 0.15s ease,
    border-color 0.15s ease,
    color 0.1s ease;
}

body {
  margin: 0;
  background: var(--bg);
  background-attachment: fixed;
  color: var(--ink);
  font:
    13.5px/1.55 -apple-system,
    BlinkMacSystemFont,
    "SF Pro Display",
    "SF Pro Text",
    "Segoe UI",
    Roboto,
    Helvetica,
    Arial,
    sans-serif;
  letter-spacing: -0.18px;
  min-height: 100vh;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

/* ==========================================================================
   2. Main Layout & Architecture
   ========================================================================== */
.app {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  background: var(--glass-sidebar);
  backdrop-filter: var(--apple-blur);
  -webkit-backdrop-filter: var(--apple-blur);
  border-right: 1px solid var(--line);
  padding: 20px 14px;
  position: sticky;
  top: 0;
  height: 100vh;
  z-index: 2;
  display: flex;
  flex-direction: column;
  box-shadow: 4px 0 24px rgba(0, 0, 0, 0.2);
}

.main {
  padding: 28px clamp(20px, 4vw, 56px);
  max-width: 1440px;
  width: 100%;
  margin: 0 auto;
}

.grid {
  display: grid;
  gap: 14px;
}

.stats {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-bottom: 15px;
}

.layout {
  grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.85fr);
  margin-bottom: 15px;
}

.two {
  grid-template-columns: 1fr 1fr;
}

/* ==========================================================================
   3. Sidebar Components
   ========================================================================== */
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 8px 24px;
}

.brand-mark {
  width: 28px;
  height: 28px;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-mark svg {
  width: 16px;
  height: 16px;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-text span {
  font-weight: 700;
  font-size: 14px;
  letter-spacing: -0.3px;
  color: var(--ink);
}

.brand-text b {
  color: var(--accent);
}

.brand-tag {
  font-size: 9.5px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-weight: 600;
}

.eyebrow {
  color: var(--muted);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 6px 8px;
}

.nav {
  display: grid;
  gap: 3px;
}

.nav button {
  border: 1px solid transparent;
  background: transparent;
  text-align: left;
  padding: 8px 10px;
  border-radius: 7px;
  color: var(--muted);
  font-weight: 500;
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: all 0.15s ease;
}

.nav-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  opacity: 0.8;
}

.nav button.active {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: rgba(88, 166, 255, 0.25);
  font-weight: 600;
}

.nav button.active .nav-icon {
  opacity: 1;
}

.nav button:hover:not(.active) {
  background: rgba(255, 255, 255, 0.04);
  color: var(--ink);
}

.side-note {
  margin-top: auto;
  padding: 12px;
  border: 1px solid var(--line);
  background: var(--glass-panel);
  backdrop-filter: var(--apple-blur);
  -webkit-backdrop-filter: var(--apple-blur);
  border-radius: 9px;
  color: var(--muted);
  font-size: 11px;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.side-note-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  margin-top: 4px;
  flex-shrink: 0;
}

/* ==========================================================================
   4. Header & Top Bar
   ========================================================================== */
.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}

.top h1 {
  font-size: 22px;
  letter-spacing: -0.6px;
  margin: 0;
  font-weight: 700;
  color: var(--ink);
}

.sub {
  color: var(--muted);
  font-size: 12.5px;
  margin-top: 2px;
}

.actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.icon-btn {
  padding: 7px 9px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.icon-btn svg {
  width: 14px;
  height: 14px;
}

/* ==========================================================================
   5. Cards, Glass Surfaces, Buttons & Inputs
   ========================================================================== */
.card {
  background: var(--glass-panel);
  border: var(--glass-border);
  backdrop-filter: var(--apple-blur);
  -webkit-backdrop-filter: var(--apple-blur);
  border-radius: 14px;
  padding: 18px 20px;
  box-shadow: var(--glass-specular);
  min-width: 0;
  position: relative;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 14px;
  pointer-events: none;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.07) 0%,
    transparent 40%
  );
}

.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 14px;
}

.card h2 {
  font-size: 14px;
  margin: 0;
  letter-spacing: -0.2px;
  font-weight: 650;
  color: var(--ink);
}

.btn {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 7px 13px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 12px;
  color: var(--ink);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.12),
    0 2px 6px rgba(0, 0, 0, 0.12);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="light"] .btn {
  background: rgba(255, 255, 255, 0.65);
  border-color: rgba(0, 0, 0, 0.12);
}

.btn:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.22);
  color: var(--ink);
  transform: translateY(-1px);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.25),
    0 4px 12px rgba(0, 0, 0, 0.18);
}

[data-theme="light"] .btn:hover {
  background: rgba(255, 255, 255, 0.95);
  border-color: rgba(0, 0, 0, 0.2);
}

.btn.sm {
  padding: 4px 9px;
  font-size: 11px;
}

.btn.primary {
  background: linear-gradient(
    180deg,
    rgba(88, 166, 255, 0.9) 0%,
    rgba(56, 139, 253, 0.85) 100%
  );
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: #ffffff;
  box-shadow:
    var(--accent-glow),
    inset 0 1px 1px rgba(255, 255, 255, 0.4);
}

.btn.primary:hover {
  filter: brightness(1.12);
  transform: translateY(-1px);
  color: #ffffff;
}

.btn.danger {
  color: var(--red);
  background: var(--red-soft);
  border-color: rgba(248, 81, 73, 0.3);
}

.btn.danger:hover {
  background: rgba(248, 81, 73, 0.28);
}

.pill {
  font-size: 10.5px;
  border-radius: 4px;
  padding: 2px 7px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
  font-family: var(--font-mono);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.pill.good {
  background: var(--green-soft);
  color: var(--green);
}

.pill.warn {
  background: var(--amber-soft);
  color: var(--amber);
}

.progress {
  height: 6px;
  background: var(--line);
  border-radius: 99px;
  overflow: hidden;
}

.progress i {
  display: block;
  height: 100%;
  background: var(--accent);
  width: 0;
  transition: width 0.25s ease;
}

.table-wrap {
  overflow-x: auto;
}

table {
  border-collapse: collapse;
  width: 100%;
  min-width: 620px;
}

th,
td {
  text-align: left;
  padding: 10px 8px;
  border-bottom: 1px solid var(--line);
  font-size: 12px;
}

th {
  color: var(--muted);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  font-weight: 700;
}

.field {
  display: grid;
  gap: 5px;
}

.field label {
  font-size: 11px;
  color: var(--muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.field input,
.field select,
.field textarea,
.search-box input {
  width: 100%;
  background: var(--glass-input);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 12px;
  color: var(--ink);
  outline: none;
  font-size: 13px;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.15);
}

.field input:focus,
.field select:focus,
.field textarea:focus,
.search-box input:focus {
  border-color: var(--accent);
  box-shadow:
    0 0 0 3px var(--accent-soft),
    inset 0 1px 2px rgba(0, 0, 0, 0.15);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 14px;
}

.grid-span-2 {
  grid-column: span 2;
}
.grid-span-3 {
  grid-column: span 3;
}

/* ==========================================================================
   6. Countdown Banner & Stat Cards
   ========================================================================== */
.countdown-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  background: var(--accent-soft);
  border: 1px solid var(--accent);
  backdrop-filter: var(--apple-blur);
  -webkit-backdrop-filter: var(--apple-blur);
  border-radius: 12px;
  padding: 12px 18px;
  margin-bottom: 20px;
  box-shadow: var(--accent-glow);
}

.countdown-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.countdown-badge {
  background: var(--accent);
  color: #ffffff;
  font-weight: 700;
  font-size: 10px;
  padding: 3px 6px;
  border-radius: 4px;
  letter-spacing: 0.6px;
  font-family: var(--font-mono);
}

.countdown-text {
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
}

.countdown-sub {
  font-size: 11px;
  color: var(--muted);
}

.countdown-timer {
  font-size: 16px;
  font-weight: 750;
  color: var(--accent);
  font-family: var(--font-mono);
}

.stat-label {
  color: var(--muted);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stat-value {
  font-size: 26px;
  font-weight: 750;
  letter-spacing: -0.8px;
  margin: 6px 0 2px;
  color: var(--ink);
  font-family: var(--font-mono);
}

.stat-foot {
  font-size: 11px;
  color: var(--muted);
}

/* ==========================================================================
   7. Subject Lists, Charts & Quick Buttons
   ========================================================================== */
.subject-list {
  display: grid;
  gap: 12px;
}

.subject-line {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 48px;
  gap: 10px;
  align-items: center;
}

.subject-line strong {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--ink);
}

.subject-line small {
  display: block;
  color: var(--muted);
  font-size: 10.5px;
  margin-top: 3px;
}

.subject-line .progress {
  height: 5px;
  margin-top: 6px;
}

.subject-line .pct {
  text-align: right;
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--muted);
  font-weight: 600;
}

.topic-list {
  display: grid;
  gap: 6px;
}

.topic {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  background: var(--glass-panel-elevated);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 6px;
}

.topic input[type="checkbox"] {
  accent-color: var(--accent);
}

.topic span {
  flex: 1;
  font-size: 12.5px;
}

.quick {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.quick .btn {
  padding: 10px;
  text-align: left;
  display: block;
}

.quick b {
  display: block;
  font-size: 12px;
  color: var(--ink);
}

.quick small {
  color: var(--muted);
  font-size: 10px;
}

.bar-chart {
  height: 140px;
  display: flex;
  align-items: end;
  gap: 8px;
  padding: 10px 0 0;
  border-bottom: 1px solid var(--line);
}

.bar-col {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  height: 100%;
  justify-content: end;
}

.bar {
  width: min(24px, 70%);
  background: var(--accent);
  opacity: 0.85;
  border-radius: 3px 3px 0 0;
  min-height: 2px;
}

.bar-col small,
.bar-col em {
  font-size: 9px;
  color: var(--muted);
  font-style: normal;
  font-family: var(--font-mono);
}

.progress-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 10px 0 4px;
  font-size: 12px;
}

/* ==========================================================================
   8. Syllabus Filters & Search Controls
   ========================================================================== */
.syllabus-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

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

.filter-pill {
  border: 1px solid var(--line);
  background: var(--glass-panel);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--muted);
  border-radius: 6px;
  padding: 5px 10px;
  font-size: 11.5px;
  font-weight: 600;
  cursor: pointer;
}

.filter-pill.active,
.filter-pill:hover {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: var(--accent);
}

.search-box {
  flex: 1;
  min-width: 200px;
  max-width: 320px;
}

/* ==========================================================================
   9. Modern Apple-Grade Syllabus Tree
   ========================================================================== */
.tree-subject-card {
  margin-bottom: 14px;
  padding: 16px 18px;
}

.tree-subject-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  user-select: none;
}

.tree-subject-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 8px;
}

.tree-subject-badge {
  font-size: 10.5px;
  font-weight: 500;
  color: var(--muted);
  font-family: var(--font-mono);
}

.tree-modules-wrap {
  margin-top: 12px;
  padding-left: 12px;
  border-left: 2px solid var(--line);
  display: grid;
  gap: 10px;
}

.tree-module {
  background: var(--glass-panel-elevated);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.tree-module-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 12px;
  background: rgba(255, 255, 255, 0.02);
  cursor: pointer;
  user-select: none;
  border-bottom: 1px solid transparent;
}

.tree-module.open .tree-module-header {
  border-bottom-color: var(--line);
}

.tree-module-title-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--ink);
}

.tree-icon-chevron {
  width: 12px;
  height: 12px;
  color: var(--muted);
  transition: transform 0.15s ease;
}

.tree-icon-chevron.rotated {
  transform: rotate(90deg);
}

.tree-module-stat {
  font-size: 10px;
  font-weight: 600;
  color: var(--muted);
  font-family: var(--font-mono);
}

.tree-subtopic-list {
  padding: 4px 8px;
  display: grid;
}

.tree-node {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 7px 8px;
  border-radius: 6px;
  transition: background 0.15s ease;
}

.tree-node:hover {
  background: rgba(128, 128, 128, 0.08);
}

.tree-node-left {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  min-width: 0;
}

.tree-checkbox {
  width: 15px;
  height: 15px;
  border-radius: 4px;
  cursor: pointer;
  accent-color: var(--green);
}

.tree-sub-title {
  font-size: 12px;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tree-sub-title.completed-text {
  text-decoration: line-through;
  color: var(--muted);
}

.tree-node-right {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.tree-status-pill {
  font-size: 10px;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 4px;
  border: 1px solid var(--line);
  background: rgba(128, 128, 128, 0.06);
  color: var(--muted);
  cursor: pointer;
  font-family: var(--font-mono);
}

.rev-checkpoints {
  display: inline-flex;
  gap: 3px;
}

.rev-chip {
  font-size: 9.5px;
  font-weight: 700;
  font-family: var(--font-mono);
  padding: 2px 5px;
  border-radius: 4px;
  border: 1px solid var(--line);
  background: rgba(128, 128, 128, 0.05);
  color: var(--muted);
  cursor: pointer;
}

.rev-chip.done {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

.tree-status-pill.status-done {
  background: var(--green-soft);
  border-color: var(--green);
  color: var(--green);
}

.tree-status-pill.status-progress {
  background: var(--amber-soft);
  border-color: var(--amber);
  color: var(--amber);
}

.tree-btn-icon {
  width: 24px;
  height: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  background: rgba(128, 128, 128, 0.06);
  border-radius: 5px;
  color: var(--muted);
}

.tree-btn-icon:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.tree-btn-icon svg {
  width: 12px;
  height: 12px;
  pointer-events: none;
}

/* ==========================================================================
   10. AI PYQ Digitizer & Quiz Hub
   ========================================================================== */
.upload-dropzone {
  border: 1px dashed var(--line);
  background: var(--glass-input);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: 10px;
  padding: 26px 20px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.upload-dropzone:hover,
.upload-dropzone.dragover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.upload-icon-wrap {
  width: 36px;
  height: 36px;
  background: rgba(128, 128, 128, 0.08);
  border: 1px solid var(--line);
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  margin-bottom: 8px;
}

.upload-text {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
}

.upload-link {
  color: var(--accent);
  text-decoration: underline;
}

.digitizer-status {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--glass-panel-elevated);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  margin-top: 12px;
}

.digitizer-preview-wrap img {
  max-width: 90px;
  max-height: 65px;
  border-radius: 6px;
  border: 1px solid var(--line);
  object-fit: cover;
}

.digitizer-spinner {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--accent);
}

.pyq-bank-list {
  display: grid;
  gap: 12px;
}

.pyq-card {
  background: var(--glass-panel);
  border: var(--glass-border);
  backdrop-filter: var(--apple-blur);
  -webkit-backdrop-filter: var(--apple-blur);
  border-radius: 12px;
  padding: 16px;
  box-shadow: var(--glass-specular);
}

.pyq-card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.pyq-badge {
  font-size: 11px;
  font-weight: 700;
  color: var(--ink);
}

.pyq-question {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--ink);
  white-space: pre-wrap;
  margin-bottom: 12px;
}

.pyq-option-label {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 9px 12px;
  background: var(--glass-input);
  border: 1px solid var(--line);
  border-radius: 7px;
  margin-bottom: 6px;
  cursor: pointer;
  font-size: 12.5px;
  color: var(--ink);
}

.pyq-option-label:hover {
  border-color: var(--accent);
}

.pyq-option-label.opt-selected {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.pyq-option-label.opt-correct {
  border-color: var(--green) !important;
  background: var(--green-soft) !important;
  color: var(--green);
  font-weight: 600;
}

.pyq-option-label.opt-wrong {
  border-color: var(--red) !important;
  background: var(--red-soft) !important;
  color: var(--red);
}

.pyq-nat-box {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 10px 0;
}

.pyq-nat-box input {
  max-width: 160px;
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--glass-input);
  color: var(--ink);
  font-family: var(--font-mono);
  font-weight: 600;
}

.pyq-verdict-banner {
  padding: 8px 12px;
  border-radius: 7px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.pyq-verdict-banner.correct {
  background: var(--green-soft);
  color: var(--green);
  border: 1px solid var(--green);
}

.pyq-verdict-banner.incorrect {
  background: var(--red-soft);
  color: var(--red);
  border: 1px solid var(--red);
}

.pyq-explanation {
  background: var(--glass-input);
  border-left: 2px solid var(--accent);
  padding: 10px 14px;
  font-size: 12px;
  color: var(--ink);
  border-radius: 0 7px 7px 0;
  margin-top: 10px;
  white-space: pre-wrap;
}

.pyq-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 11px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  padding-top: 10px;
  margin-top: 10px;
}

/* Glass Filter Select Dropdown in Saved Question Bank Header */
#pyqSubjectFilter,
#pyqStatusFilter {
  background: var(--glass-input) !important;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--line) !important;
  border-radius: 8px;
  color: var(--ink) !important;
  font-size: 11.5px;
  font-weight: 600;
  padding: 6px 30px 6px 12px !important;
  outline: none;
  cursor: pointer;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.15);
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238b949e' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E") !important;
  background-repeat: no-repeat !important;
  background-position: right 10px center !important;
}

#pyqSubjectFilter:hover,
#pyqStatusFilter:hover {
  border-color: var(--accent) !important;
}

#pyqSubjectFilter:focus,
#pyqStatusFilter:focus {
  border-color: var(--accent) !important;
  box-shadow: 0 0 0 2px var(--accent-soft);
}

#pyqSubjectFilter option,
#pyqStatusFilter option {
  background: var(--bg-base);
  color: var(--ink);
}

/* ==========================================================================
   11. Compact Apple Glass Calendar
   ========================================================================== */
.custom-calendar {
  background: var(--glass-input);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px;
  margin-top: 10px;
  user-select: none;
}

.cal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.cal-title {
  font-size: 12.5px;
  font-weight: 700;
  color: var(--ink);
  font-family: var(--font-mono);
}

.cal-weekdays {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 3px;
  text-align: center;
  font-size: 9.5px;
  font-weight: 700;
  color: var(--muted);
  margin-bottom: 4px;
  font-family: var(--font-mono);
}

.cal-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 3px;
}

.cal-day {
  height: 27px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  border-radius: 5px;
  cursor: pointer;
  color: var(--ink);
  border: 1px solid transparent;
  font-family: var(--font-mono);
}

.cal-day:hover:not(.empty-day) {
  background: var(--accent-soft);
  color: var(--accent);
}

.cal-day.empty-day {
  cursor: default;
}

.cal-day.today-day {
  border-color: var(--accent);
}

.cal-day.selected-day {
  background: var(--accent) !important;
  color: #ffffff !important;
  font-weight: 700;
}

.cal-footer-preview {
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11px;
}

/* ==========================================================================
   12. Modal & Polish Elements
   ========================================================================== */
.modal-back {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  z-index: 50;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.modal-back.open {
  display: flex;
}

.modal {
  width: min(500px, 100%);
  max-height: 85vh;
  overflow-y: auto;
  background: var(--glass-panel-elevated);
  backdrop-filter: var(--apple-blur);
  -webkit-backdrop-filter: var(--apple-blur);
  border: var(--glass-border);
  border-radius: 18px;
  padding: 18px;
  box-shadow:
    var(--glass-specular),
    0 24px 64px rgba(0, 0, 0, 0.45);
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}

.modal h2 {
  margin: 0;
  font-size: 15px;
  color: var(--ink);
}

.modal-topic-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 2px;
}

.modal-topic-subject {
  font-size: 11.5px;
  color: var(--muted);
  margin-bottom: 12px;
}

.revision-presets {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  margin-bottom: 10px;
}

.revision-presets .btn {
  padding: 6px 8px;
  font-size: 11px;
}

.modal-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 14px;
}

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(22, 27, 34, 0.9);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--line);
  color: #ffffff;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 500;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
  z-index: 100;
  box-shadow: var(--glass-specular);
}

.toast.show {
  opacity: 1;
}

.notice {
  border: 1px solid var(--amber);
  background: var(--amber-soft);
  color: var(--amber);
  padding: 9px 12px;
  border-radius: 8px;
  font-size: 11.5px;
  margin-top: 10px;
}

.empty {
  padding: 24px;
  text-align: center;
  color: var(--muted);
  font-size: 12px;
}

.section-title {
  font-size: 18px;
  letter-spacing: -0.4px;
  margin: 0 0 2px;
  font-weight: 700;
  color: var(--ink);
}

.section-intro {
  color: var(--muted);
  font-size: 12px;
  margin: 0 0 16px;
}

.view {
  display: none;
}
.view.active {
  display: block;
}
.spacer {
  height: 10px;
}
.muted {
  color: var(--muted);
}
.text-xs {
  font-size: 11px;
}
.text-sm {
  font-size: 12px;
}

/* ==========================================================================
   13. Syllabus Search Row & Mobile Dock Base Styles
   ========================================================================== */
html,
body {
  max-width: 100%;
  overflow-x: clip;
}

.syllabus-search-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  justify-content: flex-end;
}

.mobile-dock,
.mobile-sheet-back {
  display: none;
}

/* ==========================================================================
   14. Responsive Breakpoints (Tablets & Mobile)
   ========================================================================== */

/* Tablets & Small Laptops (<= 900px) */
@media (max-width: 900px) {
  .app {
    grid-template-columns: minmax(0, 1fr);
  }

  .sidebar {
    position: sticky;
    top: 0;
    height: auto;
    width: 100%;
    padding: 10px 14px;
    z-index: 30;
    border-right: none;
    border-bottom: 1px solid var(--line);
    display: flex;
    flex-direction: column;
    gap: 8px;
  }

  .brand {
    padding: 0;
  }

  .eyebrow,
  .side-note {
    display: none;
  }

  .nav {
    display: flex;
    width: 100%;
    min-width: 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    gap: 6px;
    padding: 2px 0;
    scrollbar-width: none;
  }

  .nav::-webkit-scrollbar {
    display: none;
  }

  .nav button {
    flex: 0 0 auto;
    white-space: nowrap;
    padding: 6px 11px;
    font-size: 12px;
  }

  .stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .layout,
  .two {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* Mobile Phones (<= 640px) */
@media (max-width: 640px) {
  .sidebar {
    padding: 10px 14px;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .sidebar .nav {
    display: none;
  }

  .main {
    padding: 16px 12px 92px;
  }

  input,
  select,
  textarea {
    font-size: 16px !important;
  }

  .mobile-dock {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    position: fixed;
    bottom: 10px;
    left: 10px;
    right: 10px;
    z-index: 40;
    background: var(--glass-sidebar);
    backdrop-filter: var(--apple-blur);
    -webkit-backdrop-filter: var(--apple-blur);
    border: var(--glass-border);
    border-radius: 16px;
    padding: 6px 4px;
    box-shadow:
      var(--glass-specular),
      0 10px 30px rgba(0, 0, 0, 0.45);
  }

  .mobile-dock button {
    border: none;
    background: transparent;
    color: var(--muted);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3px;
    padding: 5px 2px;
    border-radius: 10px;
    font-size: 10px;
    font-weight: 600;
  }

  .mobile-dock button svg {
    width: 18px;
    height: 18px;
  }

  .mobile-dock button.active {
    color: var(--accent);
    background: var(--accent-soft);
  }

  .mobile-sheet-back {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 45;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    align-items: flex-end;
  }

  .mobile-sheet-back.open {
    display: flex;
  }

  .mobile-sheet {
    width: 100%;
    background: var(--glass-panel-elevated);
    backdrop-filter: var(--apple-blur);
    -webkit-backdrop-filter: var(--apple-blur);
    border-top: var(--glass-border);
    border-radius: 20px 20px 0 0;
    padding: 12px 16px 88px;
    box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.4);
  }

  .mobile-sheet-handle {
    width: 36px;
    height: 4px;
    border-radius: 99px;
    background: var(--line);
    margin: 0 auto 14px;
  }

  .mobile-sheet-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  .mobile-sheet-grid button {
    border: 1px solid var(--line);
    background: var(--glass-panel);
    color: var(--ink);
    border-radius: 12px;
    padding: 14px 12px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    font-weight: 600;
    text-align: left;
  }

  .mobile-sheet-grid button svg {
    width: 18px;
    height: 18px;
    color: var(--accent);
    flex-shrink: 0;
  }

  .mobile-sheet-grid button.active {
    border-color: var(--accent);
    background: var(--accent-soft);
    color: var(--accent);
  }

  .top {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    margin-bottom: 16px;
  }

  .top h1 {
    font-size: 19px;
  }

  .actions {
    display: grid;
    grid-template-columns: auto auto 1fr 1fr;
    gap: 6px;
    width: 100%;
  }

  .actions #quickLog {
    grid-column: 1 / -1;
    width: 100%;
  }

  .countdown-banner {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 12px 14px;
  }

  .countdown-info {
    align-items: flex-start;
  }

  .countdown-timer {
    font-size: 16px;
  }

  .stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
  }

  .card {
    padding: 14px;
    border-radius: 12px;
  }

  .card-head {
    flex-wrap: wrap;
    gap: 8px;
  }

  .stat-value {
    font-size: 20px;
  }

  .form-grid {
    grid-template-columns: minmax(0, 1fr) !important;
    gap: 10px;
  }

  .grid-span-2,
  .grid-span-3 {
    grid-column: span 1 !important;
  }

  .form-actions {
    flex-direction: column;
  }

  .form-actions .btn {
    width: 100%;
  }

  .quick {
    grid-template-columns: 1fr;
  }

  .table-wrap {
    overflow-x: visible;
  }

  table,
  thead,
  tbody,
  th,
  td,
  tr {
    display: block;
    width: 100%;
    min-width: 0;
  }

  thead {
    display: none;
  }

  tbody tr {
    background: var(--glass-panel-elevated);
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 10px 12px;
    margin-bottom: 10px;
  }

  tbody td {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 12px;
    padding: 5px 0;
    border-bottom: 1px solid var(--line);
    text-align: right;
    font-size: 12.5px;
  }

  tbody td:last-child {
    border-bottom: none;
    padding-top: 8px;
    justify-content: flex-end;
  }

  tbody td::before {
    content: attr(data-label);
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: var(--muted);
    text-align: left;
    flex-shrink: 0;
  }

  tbody td[colspan] {
    display: block;
    text-align: center;
    border-bottom: none;
  }

  tbody td[colspan]::before {
    display: none;
  }

  .syllabus-controls {
    flex-direction: column;
    align-items: stretch;
  }

  .syllabus-search-row {
    width: 100%;
  }

  .search-box {
    max-width: 100%;
    min-width: 0;
    flex: 1;
  }

  .filter-pills {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    flex-wrap: nowrap;
    padding-bottom: 4px;
    scrollbar-width: none;
  }

  .filter-pills::-webkit-scrollbar {
    display: none;
  }

  .filter-pill {
    flex: 0 0 auto;
  }

  .tree-modules-wrap {
    padding-left: 8px;
  }

  .tree-subject-header {
    flex-wrap: wrap;
    gap: 8px;
  }

  .tree-node {
    flex-wrap: wrap;
    gap: 8px;
    padding: 8px 4px;
  }

  .tree-node-left {
    flex: 1 1 100%;
  }

  .tree-sub-title {
    white-space: normal;
    line-height: 1.4;
  }

  .tree-node-right {
    margin-left: 25px;
    width: calc(100% - 25px);
    flex-wrap: wrap;
    gap: 6px;
  }

  .pyq-card-head,
  .pyq-actions {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .pyq-question,
  .pyq-explanation {
    overflow-x: auto;
    word-break: break-word;
  }

  #pyqSubjectFilter,
  #pyqStatusFilter {
    max-width: 100% !important;
    width: 100%;
  }

  .toast {
    bottom: 84px;
    width: max-content;
    max-width: calc(100vw - 32px);
  }

  .modal {
    padding: 14px;
    width: 100%;
    max-height: 90vh;
    border-radius: 14px;
  }

  .cal-day {
    height: 34px;
  }

  .modal-actions {
    flex-direction: column-reverse;
    gap: 8px;
  }

  .modal-actions > div,
  .modal-actions > button {
    width: 100%;
    display: flex;
    gap: 6px;
  }

  .modal-actions button {
    flex: 1;
  }
}

/* ==========================================================================
   15. Authentic TCS iON GATE Virtual Scientific Calculator
   ========================================================================== */
.gate-calc {
  display: none;
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 390px;
  max-width: calc(100vw - 24px);
  z-index: 48;
  background: var(--glass-panel-elevated);
  backdrop-filter: var(--apple-blur);
  -webkit-backdrop-filter: var(--apple-blur);
  border: var(--glass-border);
  border-radius: 16px;
  padding: 12px;
  box-shadow:
    var(--glass-specular),
    0 24px 60px rgba(0, 0, 0, 0.45);
  user-select: none;
}

.gate-calc.open {
  display: block;
}

.calc-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.calc-mem-badge {
  background: var(--amber-soft);
  color: var(--amber);
  border: 1px solid var(--amber);
  font-size: 9.5px;
  font-weight: 700;
  font-family: var(--font-mono);
  padding: 1px 5px;
  border-radius: 4px;
}

.calc-screen {
  background: var(--glass-input);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 7px 10px;
  margin-bottom: 8px;
}

.calc-expr {
  min-height: 16px;
  font-size: 11px;
  color: var(--muted);
  font-family: var(--font-mono);
  text-align: right;
  overflow-x: auto;
  white-space: nowrap;
  scrollbar-width: none;
}

.calc-expr::-webkit-scrollbar {
  display: none;
}

.calc-display {
  width: 100%;
  border: none;
  background: transparent;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 20px !important;
  font-weight: 750;
  text-align: right;
  outline: none;
  padding: 2px 0 0;
}

.calc-mode-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
  padding: 0 2px;
}

.calc-radios {
  display: flex;
  gap: 12px;
  font-size: 11.5px;
  font-weight: 600;
  color: var(--ink);
}

.calc-radios label {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
}

.calc-radios input[type="radio"] {
  accent-color: var(--accent);
  margin: 0;
}

.calc-grid-tcs {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 4px;
}

.calc-grid-tcs button {
  border: 1px solid var(--line);
  background: rgba(128, 128, 128, 0.08);
  color: var(--ink);
  border-radius: 6px;
  padding: 7px 1px;
  font-size: 11px;
  font-family: var(--font-mono);
  font-weight: 600;
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.calc-grid-tcs button:hover {
  background: rgba(128, 128, 128, 0.18);
  border-color: var(--accent);
}

.calc-grid-tcs button:active {
  transform: scale(0.96);
}

.calc-grid-tcs button.calc-num {
  background: rgba(128, 128, 128, 0.16);
  font-weight: 750;
  font-size: 12.5px;
}

.calc-grid-tcs button.calc-mem {
  color: var(--amber);
  background: var(--amber-soft);
  border-color: rgba(210, 153, 34, 0.25);
}

.calc-grid-tcs button.calc-op {
  color: var(--accent);
  background: var(--accent-soft);
}

.calc-grid-tcs button.calc-danger {
  color: var(--red);
  background: var(--red-soft);
}

.calc-grid-tcs button.calc-eq {
  background: var(--green);
  color: #ffffff;
  border-color: var(--green);
  font-weight: 750;
}

@media (max-width: 640px) {
  .gate-calc {
    left: 10px;
    right: 10px;
    bottom: 78px;
    width: auto;
    max-width: none;
    padding: 10px;
  }

  .calc-grid-tcs {
    gap: 3px;
  }

  .calc-grid-tcs button {
    padding: 8px 0;
    font-size: 10.5px;
  }
}

/* ==========================================================================
   16. Mock Test Score Trend Chart
   ========================================================================== */
.trend-chart-wrap {
  width: 100%;
  overflow-x: auto;
  padding-top: 4px;
}

.trend-svg {
  width: 100%;
  min-width: 320px;
  height: 170px;
  display: block;
}

/* ==========================================================================
   17. BYOK Setup & Guide View
   ========================================================================== */
.byok-key-row {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.byok-key-row input {
  flex: 1;
  min-width: 220px;
  background: var(--glass-input);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 12px;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12.5px;
  outline: none;
}

.byok-key-row input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.byok-steps {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 10px;
  font-size: 12.5px;
  color: var(--ink);
  line-height: 1.55;
}

.byok-steps code {
  background: var(--glass-input);
  border: 1px solid var(--line);
  padding: 1px 5px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--accent);
}

.byok-link {
  color: var(--accent);
  font-weight: 600;
  text-decoration: underline;
}

.byok-faq {
  display: grid;
  gap: 12px;
}

.byok-faq-item b {
  display: block;
  font-size: 12.5px;
  color: var(--ink);
  margin-bottom: 2px;
}

.byok-faq-item p {
  margin: 0;
  font-size: 12px;
  color: var(--muted);
  line-height: 1.5;
}

@media (max-width: 640px) {
  .byok-key-row {
    flex-direction: column;
    align-items: stretch;
  }
}