:root {
  --bg-primary: #010101;
  --content-1: #ffffff0d;
  --content-2: #ffffff1f;
  --content-2-hover: #ffffff26;
  --text-primary: white;
  --text-secondary: #8b949e;
  --accent-primary: #e9a0ff;
  --accent-tertiary: #a78bfa;
  --border-color-1: #ffffff14;
  --border-color-2: #ffffff4d;
  --grid-color: #ffffff0d;
  --gradient-mesh: radial-gradient(ellipse 90% 40% at 50% 100%, #bf80da40, transparent 70%);
  --radius-full: 9999px;
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --modal-bg: #111116;
  --clock-glow: drop-shadow(0 0 28px #a78bfa28);
  --clock-tick-major: rgba(255, 255, 255, 0.33);
  --clock-tick-minor: rgba(255, 255, 255, 0.13);
  --clock-label-color: rgba(255, 255, 255, 0.65);
  --clock-hand-color: white;
  --midpoint-line-color: rgba(255, 255, 255, 0.3);
  --btn-primary-glow: #e9a0ff40;
  --btn-primary-border-glow: #e9a0ff50;
  --no-leave-bg: rgba(192, 57, 43, 0.1);
  --no-leave-border: rgba(192, 57, 43, 0.3);
}

:root[data-theme="light"] {
  --bg-primary: #f8f9fc;
  --content-1: #0000000a;
  --content-2: #e2e8f0;
  --content-2-hover: #cbd5e1;
  --text-primary: #0f172a;
  --text-secondary: #64748b;
  --accent-primary: #1e40af;
  --accent-tertiary: #1e3a8a;
  --border-color-1: #e2e8f0;
  --border-color-2: #94a3b8;
  --grid-color: #0000000a;
  --gradient-mesh: radial-gradient(ellipse 90% 40% at 50% 100%, #3b82f608, transparent 70%);
  --modal-bg: #ffffff;
  --clock-glow: drop-shadow(0 0 20px #1e40af15);
  --clock-tick-major: rgba(0, 0, 0, 0.35);
  --clock-tick-minor: rgba(0, 0, 0, 0.15);
  --clock-label-color: rgba(0, 0, 0, 0.75);
  --clock-hand-color: #1a2040;
  --midpoint-line-color: rgba(0, 0, 0, 0.25);
  --btn-primary-glow: #1e40af28;
  --btn-primary-border-glow: #1e40af40;
  --no-leave-bg: #fef2f2;
  --no-leave-border: #fca5a5;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 16px;
  background-color: var(--bg-primary);
  background-image:
    linear-gradient(to right, var(--grid-color) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-color) 1px, transparent 1px);
  background-size: 40px 40px;
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  min-height: 100vh;
  margin: 0;
  background-image: var(--gradient-mesh);
  background-attachment: fixed;
  color: var(--text-primary);
  font-family: "Google Sans Flex", system-ui, -apple-system, sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 6.5rem 1.5rem 2rem;
}

/* ── Top bar ─────────────────────────────────────────────────────────── */
.top-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: 1.25rem 1.75rem 1rem;
  z-index: 100;
  pointer-events: none;
}

.top-bar-left,
.top-bar-right {
  pointer-events: auto;
}

.exam-title {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.idle-info {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-top: 0.2rem;
  max-width: 500px;
}

.idle-info a {
  color: var(--text-secondary);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: var(--border-color-2);
  transition: color var(--transition-base);
}

.idle-info a:hover {
  color: var(--text-primary);
}

.exam-phase-name {
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.01em;
  min-height: 2rem;
  line-height: 1.2;
}

.top-bar-right {
  display: flex;
  gap: 8px;
  align-items: center;
  padding-top: 0.2rem;
}

.top-btn {
  padding: 0.5rem 1.4rem;
  font-size: 0.85rem;
}

#pauseBtn { border-radius: var(--radius-full) 0 0 var(--radius-full); }
#resetBtn { border-radius: 0 var(--radius-full) var(--radius-full) 0; }

/* ── Clock ──────────────────────────────────────────────────────────── */
.clock-container {
  margin-bottom: 2.5rem;
  filter: var(--clock-glow);
}

#clockSvg {
  width: clamp(180px, 24vw, 240px);
  height: clamp(180px, 24vw, 240px);
  display: block;
}

#clockTicks .tick-major { stroke: var(--clock-tick-major); }
#clockTicks .tick-minor { stroke: var(--clock-tick-minor); }
#clockLabels text       { fill: var(--clock-label-color); }
#hourHand, #minuteHand  { stroke: var(--clock-hand-color); }
#secondHand             { stroke: var(--accent-primary); }
.clock-center-big       { fill: var(--clock-hand-color); }
.clock-center-small     { fill: var(--accent-primary); }
[data-theme="light"] #secondHand     { stroke: #dc2626; }
[data-theme="light"] .clock-center-small { fill: #dc2626; }
.clock-ring             { stroke: var(--border-color-1); }
[data-theme="light"] .clock-face { fill: url(#faceLight); }

/* ── Progress bar ───────────────────────────────────────────────────── */
.progress-section {
  width: 100%;
  max-width: 920px;
  margin-bottom: 2rem;
}

/* ── Ticks above bar ────────────────────────────────────────────────── */
.progress-ticks-row {
  position: relative;
  height: 80px;
  overflow: visible;
  margin-bottom: 0;
}

.tick-item {
  position: absolute;
  top: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  align-items: center;
  transform: translateX(-50%);
  pointer-events: none;
}

.tick-item.tick-first {
  transform: translateX(0);
  align-items: flex-start;
}

.tick-item.tick-last {
  transform: translateX(-100%);
  align-items: flex-end;
}

.tick-label-top {
  font-size: 0.98rem;
  font-weight: 400;
  color: var(--text-secondary);
  line-height: 1.3;
  height: 1rem;
  white-space: nowrap;
  margin-bottom: 4px;
}

.tick-label-time {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-primary);
  letter-spacing: 0.01em;
  line-height: 1.3;
  white-space: nowrap;
}

.tick-line {
  border-radius: 1px;
  margin-top: 3px;
  margin-bottom: 6px;
}

.tick-line-end {
  width: 2px;
  height: 26px;
  background: var(--text-primary);
  opacity: 0.5;
}

.tick-line-mid {
  width: 1.5px;
  height: 26px;
  background: var(--midpoint-line-color);
}

.tick-line-minor {
  width: 1.5px;
  height: 18px;
  background: var(--midpoint-line-color);
}

.tick-time-bold {
  font-weight: 700;
}

.progress-bar-track {
  height: 30px;
  background: var(--content-2);
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color-1);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-tertiary), var(--accent-primary));
  border-radius: var(--radius-full) 0 0 var(--radius-full);
  width: 0%;
  transition: width 0.3s linear;
}

/* ── Status ─────────────────────────────────────────────────────────── */
.status-section {
  text-align: center;
  margin-bottom: 0.75rem;
}

.phase-label {
  font-size: 5.5vh;
  font-weight: 300;
  letter-spacing: 0.01em;
  color: var(--text-primary);
  margin-bottom: 0.45rem;
  transition: color var(--transition-base);
  min-height: 2rem;
}

.phase-label.warning { color: #dc2626; }

.phase-timer {
  display: inline-block;
  min-width: 6ch;
  font-variant-numeric: tabular-nums;
  text-align: right;
  font-weight: 700;
}

.leave-label {
  font-size: 2.5vh;
  color: var(--text-secondary);
  min-height: 1.2rem;
  padding: 0;
  border-radius: 8px;
  transition: background var(--transition-base), border var(--transition-base), padding var(--transition-base);
}

.leave-label.restricted {
  background: var(--no-leave-bg);
  border: 1px solid var(--no-leave-border);
  padding: 0.6rem 1.5rem;
  color: var(--text-primary);
}

body.exam-running .leave-label {
  position: fixed;
  bottom: 4rem;
  left: 50%;
  transform: translateX(-50%);
  width: 90%;
  max-width: 760px;
  text-align: center;
  z-index: 10;
}

/* ── Spacer + buttons ───────────────────────────────────────────────── */
.spacer { flex: 1; min-height: 1rem; }

.button-row {
  display: flex;
  gap: 1rem;
  margin-top: 1.2rem;
}

.btn {
  background: var(--content-2);
  border-radius: var(--radius-full);
  color: var(--text-primary);
  cursor: pointer;
  border: 2px solid transparent;
  padding: 0.65rem 2rem;
  font-family: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  transition: all var(--transition-base);
}

.btn:hover {
  background: var(--content-2-hover);
  border-color: var(--border-color-2);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px #0006;
}

.btn:active { transform: translateY(0); }

.btn:disabled {
  opacity: 0;
  pointer-events: none;
}

.btn.primary {
  background: linear-gradient(135deg, var(--accent-tertiary), var(--accent-primary));
  border-color: transparent;
  color: white;
}

.btn.primary:hover {
  box-shadow: 0 0 24px var(--btn-primary-glow), 0 4px 16px #0006;
  border-color: var(--btn-primary-border-glow);
}

/* ── Modal ──────────────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.65);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: all;
}

.modal {
  background: var(--modal-bg);
  border: 1px solid var(--border-color-1);
  border-radius: 1.25rem;
  padding: 2rem;
  width: 92%;
  max-width: 460px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 24px 60px #00000099;
}

.modal::-webkit-scrollbar { width: 4px; }
.modal::-webkit-scrollbar-track { background: transparent; }
.modal::-webkit-scrollbar-thumb { background: var(--border-color-2); border-radius: 4px; }

.modal-title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin-bottom: 1.75rem;
}

.config-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.1rem;
}

.config-item label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  flex: 1;
  line-height: 1.4;
  cursor: pointer;
}

.config-item input[type="time"],
.config-item select {
  background: var(--content-2);
  border: 1px solid var(--border-color-1);
  color: var(--text-primary);
  border-radius: 0.5rem;
  padding: 0.4rem 0.7rem;
  font-family: inherit;
  font-size: 0.875rem;
  width: 140px;
  outline: none;
  transition: border-color var(--transition-base);
  color-scheme: dark;
}

[data-theme="light"] .config-item input[type="time"],
[data-theme="light"] .config-item select {
  color-scheme: light;
}

.config-item input[type="number"] {
  background: var(--content-2);
  border: 1px solid var(--border-color-1);
  color: var(--text-primary);
  border-radius: 0.5rem;
  padding: 0.4rem 0.7rem;
  font-family: inherit;
  font-size: 0.875rem;
  width: 80px;
  outline: none;
  transition: border-color var(--transition-base);
}

.config-item input[type="time"]:focus,
.config-item input[type="number"]:focus,
.config-item select:focus {
  border-color: var(--accent-primary);
}

.config-item input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--accent-primary);
  cursor: pointer;
  flex-shrink: 0;
}

.config-divider {
  height: 1px;
  background: var(--border-color-1);
  margin: 1.25rem 0;
}

.modal-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: flex-end;
  margin-top: 1.75rem;
}

.modal-actions .btn {
  padding: 0.55rem 1.5rem;
  font-size: 0.875rem;
}

select option { background: var(--modal-bg); color: var(--text-primary); }

/* ── Height-responsive layout ───────────────────────────────────────── */
@media (max-height: 750px) {
  body { padding-top: 5rem; }
  .clock-container { margin-bottom: 1.75rem; }
}

@media (max-height: 650px) {
  body { padding-top: 4rem; }
  .clock-container { margin-bottom: 1.25rem; }
  .progress-section { margin-bottom: 1.25rem; }
}

@media (max-height: 560px) {
  body { padding-top: 3rem; }
  .clock-container { margin-bottom: 0.75rem; }
  .progress-section { margin-bottom: 0.75rem; }
  #clockSvg { width: clamp(140px, 20vw, 200px); height: clamp(140px, 20vw, 200px); }
}