/* ============================================================
   study-mode.css — Study Mode v3.0  (Apple-premium upgrade)
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ── Reset ──────────────────────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
* { word-wrap: break-word; overflow-wrap: break-word; }

/* ── Design Tokens ──────────────────────────────────────── */
:root {
  /* accent pair (overridden by theme) */
  --accent-a: #6366f1;
  --accent-b: #8b5cf6;

  /* semantic colors */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger:  #ef4444;

  /* surfaces */
  --surface-page:    #f0f4f8;
  --surface-card:    #ffffff;
  --surface-inset:   #f8fafc;
  --surface-border:  #e4e9f0;

  /* text */
  --text-primary:   #0d1117;
  --text-secondary: #4b5563;
  --text-muted:     #9ca3af;

  /* shadows */
  --shadow-xs: 0 1px 3px rgba(0,0,0,.06);
  --shadow-sm: 0 2px 8px rgba(0,0,0,.07);
  --shadow-md: 0 6px 24px rgba(0,0,0,.09);
  --shadow-lg: 0 12px 48px rgba(0,0,0,.11);
  --shadow-xl: 0 24px 72px rgba(0,0,0,.14);

  /* radii */
  --r-sm:   10px;
  --r-md:   16px;
  --r-lg:   22px;
  --r-xl:   32px;
  --r-full: 9999px;

  /* layout */
  --nav-h:  72px;
  --bar-h:  60px;
  --ease:   0.22s ease;
  --ease-s: 0.38s ease;
}

/* ── Theme Variants ─────────────────────────────────────── */
body.theme-ocean  { --accent-a: #0ea5e9; --accent-b: #06b6d4; }
body.theme-forest { --accent-a: #10b981; --accent-b: #059669; }
body.theme-sunset { --accent-a: #f59e0b; --accent-b: #f97316; }
body.theme-cherry { --accent-a: #ec4899; --accent-b: #db2777; }
body.theme-purple { --accent-a: #8b5cf6; --accent-b: #7c3aed; }

/* ── Dark Mode ──────────────────────────────────────────── */
body.dark-mode {
  --surface-page:   #0d1117;
  --surface-card:   #161b22;
  --surface-inset:  #0d1117;
  --surface-border: #30363d;
  --text-primary:   #e6edf3;
  --text-secondary: #8b949e;
  --text-muted:     #484f58;
  --shadow-md: 0 6px 24px rgba(0,0,0,.4);
  --shadow-lg: 0 12px 48px rgba(0,0,0,.5);
  --shadow-xl: 0 24px 72px rgba(0,0,0,.6);
}

/* ── Base ───────────────────────────────────────────────── */
html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--surface-page);
  color: var(--text-primary);
  min-height: 100vh;
  transition: background var(--ease-s), color var(--ease-s);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  display: flex;
  flex-direction: column;
}

/* soft mesh background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: radial-gradient(circle, rgba(99,102,241,.035) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
  z-index: 0;
}

body.dark-mode::before {
  background-image: radial-gradient(circle, rgba(99,102,241,.055) 1px, transparent 1px);
}

a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--accent-a);
  outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0;
  margin: -1px; overflow: hidden; clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}

/* ── Study Toolbar ──────────────────────────────────────── */
.study-toolbar {
  position: sticky;
  top: var(--nav-h);
  z-index: 900;
  background: rgba(255,255,255,.85);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--surface-border);
  box-shadow: 0 1px 0 rgba(0,0,0,.04), var(--shadow-xs);
  transition: background var(--ease-s), border-color var(--ease-s);
}

body.dark-mode .study-toolbar {
  background: rgba(22,27,34,.88);
  border-bottom-color: rgba(48,54,61,.7);
  box-shadow: 0 1px 0 rgba(0,0,0,.2);
}

.toolbar-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 2rem;
  height: var(--bar-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.toolbar-brand {
  display: flex;
  align-items: center;
  gap: .65rem;
}

.toolbar-icon {
  font-size: 1.5rem;
  line-height: 1;
}

.toolbar-title {
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--text-primary);
}

.toolbar-sub {
  font-size: .78rem;
  color: var(--text-muted);
  display: none;
}

@media (min-width: 640px) { .toolbar-sub { display: block; } }

.toolbar-actions {
  display: flex;
  align-items: center;
  gap: .5rem;
}

.tool-btn {
  background: var(--surface-inset);
  border: 1.5px solid var(--surface-border);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: all var(--ease);
  flex-shrink: 0;
}

.tool-btn:hover {
  border-color: var(--accent-a);
  background: var(--surface-card);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(99,102,241,.18);
}

.tool-btn-icon { display: block; line-height: 1; }

.toolbar-back-btn {
  background: linear-gradient(135deg, var(--accent-a), var(--accent-b));
  color: #fff;
  padding: .55rem 1.15rem;
  border-radius: var(--r-sm);
  text-decoration: none;
  font-size: .83rem;
  font-weight: 700;
  letter-spacing: .01em;
  white-space: nowrap;
  box-shadow: 0 4px 14px rgba(99,102,241,.28);
  transition: all var(--ease);
  display: inline-flex;
  align-items: center;
  gap: 5px;
  border: none;
}

.toolbar-back-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 7px 20px rgba(99,102,241,.38);
}

/* ── Hero Strip ─────────────────────────────────────────── */
.study-hero {
  background: linear-gradient(135deg, var(--accent-a) 0%, var(--accent-b) 100%);
  padding: 3rem 2rem 3.5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.study-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 70% 0%, rgba(255,255,255,.18) 0%, transparent 60%);
  pointer-events: none;
}

.study-hero::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 40px;
  background: var(--surface-page);
  clip-path: ellipse(55% 100% at 50% 100%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  background: rgba(255,255,255,.22);
  border: 1px solid rgba(255,255,255,.35);
  color: #fff;
  font-size: .72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .1em;
  padding: 5px 14px;
  border-radius: var(--r-full);
  margin-bottom: 1rem;
  backdrop-filter: blur(8px);
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 900;
  color: #fff;
  letter-spacing: -.04em;
  line-height: 1.1;
  margin-bottom: .5rem;
}

.hero-sub {
  color: rgba(255,255,255,.82);
  font-size: 1rem;
  font-weight: 400;
}

/* ── Main Layout ────────────────────────────────────────── */
.study-main {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem 2rem 5rem;
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 1.75rem;
  align-items: start;
  position: relative;
  z-index: 1;
  flex: 1;
}

@media (max-width: 980px) {
  .study-main {
    grid-template-columns: 1fr;
  }
}

/* ── Timer Card ─────────────────────────────────────────── */
.timer-card {
  background: var(--surface-card);
  border-radius: var(--r-xl);
  padding: 2.5rem 2.25rem 2rem;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--surface-border);
  position: relative;
  overflow: hidden;
  transition: box-shadow var(--ease-s);
}

.timer-card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--r-xl);
  background: linear-gradient(135deg, rgba(99,102,241,.03), transparent 60%);
  pointer-events: none;
}

/* ── Break Banner ───────────────────────────────────────── */
.break-banner[hidden] { display: none !important; }

.break-banner {
  background: linear-gradient(135deg, #059669, #10b981);
  border-radius: var(--r-lg);
  padding: 1.5rem;
  margin-bottom: 1.75rem;
  color: #fff;
  box-shadow: 0 8px 28px rgba(16,185,129,.28);
  animation: slideDown .35s ease;
}

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

.break-banner-header {
  display: flex;
  align-items: flex-start;
  gap: .85rem;
  margin-bottom: 1.1rem;
}

.break-title-icon { font-size: 2rem; line-height: 1; flex-shrink: 0; }

.break-banner-header h3 {
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 2px;
}

.break-banner-header p {
  font-size: .85rem;
  opacity: .85;
}

.break-activity {
  background: rgba(255,255,255,.18);
  border: 1px solid rgba(255,255,255,.25);
  backdrop-filter: blur(6px);
  border-radius: var(--r-sm);
  padding: 1rem 1.1rem;
  display: flex;
  align-items: flex-start;
  gap: .9rem;
  margin-bottom: 1rem;
}

.break-activity-icon {
  font-size: 2rem;
  flex-shrink: 0;
  line-height: 1;
}

.break-activity-body strong {
  display: block;
  font-size: .95rem;
  font-weight: 700;
  margin-bottom: 3px;
}

.break-activity-body p {
  font-size: .84rem;
  line-height: 1.55;
  opacity: .9;
}

.break-new-btn {
  background: rgba(255,255,255,.18);
  color: #fff;
  border: 1.5px solid rgba(255,255,255,.45);
  padding: .55rem 1.25rem;
  border-radius: var(--r-sm);
  cursor: pointer;
  font-weight: 700;
  font-size: .84rem;
  font-family: inherit;
  transition: all var(--ease);
}

.break-new-btn:hover {
  background: #fff;
  color: #059669;
  transform: translateY(-1px);
}

/* ── Mode Pills ─────────────────────────────────────────── */
.mode-pills {
  display: flex;
  gap: .45rem;
  background: var(--surface-inset);
  border: 1px solid var(--surface-border);
  border-radius: var(--r-md);
  padding: 5px;
  margin-bottom: 2rem;
}

.mode-pill {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: .65rem .5rem;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-family: inherit;
  font-size: .82rem;
  font-weight: 600;
  border-radius: var(--r-sm);
  cursor: pointer;
  transition: all var(--ease);
  line-height: 1.25;
}

.mode-pill em {
  font-style: normal;
  font-size: .68rem;
  opacity: .72;
}

.mode-pill:hover:not(.active) {
  background: var(--surface-card);
  color: var(--text-primary);
}

.mode-pill.active {
  background: var(--surface-card);
  color: var(--accent-a);
  font-weight: 800;
  box-shadow: var(--shadow-xs);
}

/* ── Ring Timer ─────────────────────────────────────────── */
.ring-wrap {
  position: relative;
  width: 260px;
  height: 260px;
  margin: 0 auto 2rem;
}

.ring-glow {
  position: absolute;
  inset: -16px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(99,102,241,.12) 0%, transparent 70%);
  pointer-events: none;
  opacity: 0;
  transition: opacity .5s ease;
}

.ring-wrap:has(.ring-circle.active) .ring-glow,
.ring-circle.active ~ .ring-glow { opacity: 1; }

.ring-circle {
  width: 260px;
  height: 260px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ring-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.ring-track {
  fill: none;
  stroke: var(--surface-border);
  stroke-width: 8;
}

.ring-bar {
  fill: none;
  stroke-width: 8;
  stroke-linecap: round;
  transition: stroke-dashoffset 1s linear;
  filter: drop-shadow(0 0 6px rgba(99,102,241,.35));
  stroke: var(--accent-a);
}

.ring-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  text-align: center;
}

.ring-time {
  font-size: 3.6rem;
  font-weight: 900;
  letter-spacing: -.05em;
  line-height: 1;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.ring-label {
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--text-muted);
}

@keyframes pulse {
  0%,100% { transform: scale(1); }
  50%      { transform: scale(1.025); }
}

.ring-circle.active { animation: pulse 2s infinite ease-in-out; }

/* ── Timer Controls ─────────────────────────────────────── */
.timer-controls {
  display: flex;
  justify-content: center;
  gap: .65rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.ctrl-btn {
  padding: .82rem 1.65rem;
  border: none;
  border-radius: var(--r-md);
  font-size: .92rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--ease);
  letter-spacing: .01em;
  display: inline-flex;
  align-items: center;
  gap: .4rem;
}

.ctrl-primary {
  background: linear-gradient(135deg, var(--accent-a), var(--accent-b));
  color: #fff;
  min-width: 130px;
  justify-content: center;
  box-shadow: 0 6px 22px rgba(99,102,241,.32);
}

.ctrl-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(99,102,241,.44);
}

.ctrl-primary:active { transform: translateY(0); }

.ctrl-ghost {
  background: var(--surface-inset);
  color: var(--text-secondary);
  border: 1.5px solid var(--surface-border);
}

.ctrl-ghost:hover {
  border-color: var(--accent-a);
  color: var(--accent-a);
  background: var(--surface-card);
  transform: translateY(-1px);
}

.ctrl-ghost:active { transform: translateY(0); }

/* ── Stats Row ──────────────────────────────────────────── */
.stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: .85rem;
  margin-bottom: 1.25rem;
}

.stat-tile {
  background: var(--surface-inset);
  border: 1px solid var(--surface-border);
  border-radius: var(--r-md);
  padding: 1.1rem .75rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  transition: all var(--ease);
  position: relative;
  overflow: hidden;
}

.stat-tile::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2.5px;
  background: linear-gradient(90deg, var(--accent-a), var(--accent-b));
  border-radius: var(--r-md) var(--r-md) 0 0;
}

.stat-tile:hover {
  border-color: var(--accent-a);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.stat-emoji { font-size: 1.4rem; line-height: 1; }

.stat-tile strong {
  font-size: 1.7rem;
  font-weight: 900;
  color: var(--accent-a);
  letter-spacing: -.03em;
  line-height: 1;
}

.stat-tile small {
  font-size: .7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--text-muted);
}

/* ── Keyboard Hints ─────────────────────────────────────── */
.kbd-hints {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  font-size: .74rem;
  color: var(--text-muted);
}

.kbd-hints span {
  display: flex;
  align-items: center;
  gap: 5px;
}

kbd {
  display: inline-block;
  background: var(--surface-inset);
  border: 1.5px solid var(--surface-border);
  border-bottom-width: 3px;
  border-radius: 5px;
  padding: 1px 7px;
  font-size: .7rem;
  font-family: inherit;
  font-weight: 700;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ── Sidebar ────────────────────────────────────────────── */
.study-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* ── Info Cards ─────────────────────────────────────────── */
.info-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .85rem;
}

@media (max-width: 980px) {
  .info-cards { grid-template-columns: repeat(2, 1fr); }
}

.info-card {
  background: var(--surface-card);
  border: 1px solid var(--surface-border);
  border-radius: var(--r-lg);
  padding: 1.25rem 1rem;
  display: flex;
  flex-direction: column;
  gap: .5rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--ease);
  position: relative;
  overflow: hidden;
}

.info-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2.5px;
  background: linear-gradient(90deg, var(--accent-a), var(--accent-b));
  border-radius: var(--r-lg) var(--r-lg) 0 0;
}

.info-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: rgba(99,102,241,.25);
}

.info-card-icon { font-size: 1.75rem; line-height: 1; }

.info-card-body h4 {
  font-size: .9rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 3px;
  letter-spacing: -.01em;
}

.info-card-body p {
  font-size: .78rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.info-card-btn {
  align-self: flex-start;
  margin-top: .25rem;
  background: none;
  border: none;
  color: var(--accent-a);
  font-size: .78rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  padding: 0;
  transition: opacity var(--ease);
}

.info-card-btn:hover { opacity: .7; }

/* ── Panel (Tasks & Music) ──────────────────────────────── */
.panel {
  background: var(--surface-card);
  border-radius: var(--r-xl);
  padding: 1.6rem 1.5rem;
  border: 1px solid var(--surface-border);
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
  transition: box-shadow var(--ease-s);
}

.panel::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-a), var(--accent-b));
  border-radius: var(--r-xl) var(--r-xl) 0 0;
}

.panel:hover { box-shadow: var(--shadow-lg); }

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.1rem;
}

.panel-header h2 {
  font-size: 1rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -.015em;
  display: flex;
  align-items: center;
  gap: .5rem;
}

.badge {
  background: linear-gradient(135deg, var(--accent-a), var(--accent-b));
  color: #fff;
  font-size: .72rem;
  font-weight: 800;
  min-width: 22px;
  height: 22px;
  padding: 0 8px;
  border-radius: var(--r-full);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* ── To-Do ──────────────────────────────────────────────── */
.todo-input-row {
  display: flex;
  gap: .45rem;
  margin-bottom: 1rem;
}

.todo-input {
  flex: 1;
  padding: .7rem .95rem;
  border: 1.5px solid var(--surface-border);
  border-radius: var(--r-sm);
  background: var(--surface-inset);
  color: var(--text-primary);
  font-size: .86rem;
  font-family: inherit;
  transition: all var(--ease);
}

.todo-input::placeholder { color: var(--text-muted); }

.todo-input:focus {
  outline: none;
  border-color: var(--accent-a);
  background: var(--surface-card);
  box-shadow: 0 0 0 3px rgba(99,102,241,.11);
}

.todo-add {
  background: linear-gradient(135deg, var(--accent-a), var(--accent-b));
  color: #fff;
  border: none;
  width: 42px;
  height: 42px;
  border-radius: var(--r-sm);
  font-size: 1.4rem;
  font-weight: 700;
  cursor: pointer;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(99,102,241,.28);
  transition: all var(--ease);
}

.todo-add:hover { transform: scale(1.06); box-shadow: 0 6px 18px rgba(99,102,241,.38); }
.todo-add:active { transform: scale(1); }

.todo-list {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  max-height: 300px;
  overflow-y: auto;
  padding-right: 2px;
}

.todo-list::-webkit-scrollbar { width: 4px; }
.todo-list::-webkit-scrollbar-track { background: var(--surface-inset); border-radius: 4px; }
.todo-list::-webkit-scrollbar-thumb { background: var(--surface-border); border-radius: 4px; }
.todo-list::-webkit-scrollbar-thumb:hover { background: var(--accent-a); }

.todo-item {
  background: var(--surface-inset);
  border: 1.5px solid var(--surface-border);
  border-radius: var(--r-sm);
  padding: .75rem .9rem;
  display: flex;
  align-items: center;
  gap: .65rem;
  transition: all var(--ease);
}

.todo-item:hover {
  border-color: rgba(99,102,241,.4);
  transform: translateX(2px);
  box-shadow: var(--shadow-xs);
}

.todo-item.completed { opacity: .5; }
.todo-item.completed .todo-text { text-decoration: line-through; }

.todo-checkbox {
  width: 17px;
  height: 17px;
  flex-shrink: 0;
  accent-color: var(--accent-a);
  cursor: pointer;
}

.todo-text {
  flex: 1;
  font-size: .85rem;
  color: var(--text-primary);
  line-height: 1.45;
}

.todo-pomodoro {
  background: rgba(99,102,241,.1);
  color: var(--accent-a);
  font-size: .7rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 6px;
  flex-shrink: 0;
}

.todo-delete {
  background: none;
  border: none;
  font-size: .95rem;
  cursor: pointer;
  padding: 3px 5px;
  border-radius: 6px;
  color: var(--text-muted);
  opacity: .65;
  transition: all var(--ease);
  flex-shrink: 0;
}

.todo-delete:hover {
  background: #fef2f2;
  color: var(--color-danger);
  opacity: 1;
  transform: scale(1.1);
}

body.dark-mode .todo-delete:hover { background: rgba(239,68,68,.12); }

.todo-empty {
  text-align: center;
  padding: 1.75rem 1rem;
  color: var(--text-muted);
  font-size: .85rem;
}

/* ── Music Panel ────────────────────────────────────────── */
.music-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.music-status {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: .75rem;
  color: var(--text-muted);
  font-weight: 500;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--surface-border);
  display: inline-block;
  transition: background var(--ease);
}

.music-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: .5rem;
  margin-bottom: 1.1rem;
}

.music-tile {
  background: var(--surface-inset);
  border: 1.5px solid var(--surface-border);
  border-radius: var(--r-sm);
  padding: .75rem .5rem;
  cursor: pointer;
  font-family: inherit;
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  font-size: .7rem;
  font-weight: 600;
  transition: all var(--ease);
}

.music-tile-icon { font-size: 1.5rem; line-height: 1; display: block; }

.music-tile:hover {
  border-color: var(--accent-a);
  background: var(--surface-card);
  transform: translateY(-2px);
  box-shadow: var(--shadow-xs);
}

.music-tile.active {
  background: linear-gradient(135deg, var(--accent-a), var(--accent-b));
  color: #fff;
  border-color: transparent;
  box-shadow: 0 5px 16px rgba(99,102,241,.32);
  transform: translateY(-1px);
}

.volume-row {
  display: flex;
  align-items: center;
  gap: .75rem;
}

.volume-label {
  font-size: .8rem;
  color: var(--text-secondary);
  font-weight: 500;
  white-space: nowrap;
  min-width: 72px;
}

.volume-slider {
  flex: 1;
  height: 5px;
  border-radius: 5px;
  background: var(--surface-border);
  outline: none;
  -webkit-appearance: none;
  appearance: none;
  cursor: pointer;
}

.volume-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent-a);
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(99,102,241,.3);
  transition: transform .15s ease;
}

.volume-slider::-webkit-slider-thumb:hover { transform: scale(1.2); }
.volume-slider::-moz-range-thumb {
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--accent-a);
  cursor: pointer; border: none;
}

/* ── FABs ───────────────────────────────────────────────── */
.fab-group {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  display: flex;
  flex-direction: column;
  gap: .7rem;
  z-index: 100;
}

.fab {
  width: 54px;
  height: 54px;
  border-radius: 16px;
  border: none;
  cursor: pointer;
  font-size: 1.3rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  box-shadow: var(--shadow-lg);
  transition: all var(--ease);
  font-family: inherit;
  position: relative;
}

.fab-tip {
  font-size: .5rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .04em;
  line-height: 1;
}

.fab:hover {
  transform: translateY(-3px) scale(1.06);
  box-shadow: var(--shadow-xl);
}

.fab:active { transform: translateY(0) scale(1); }

.fab-methods  { background: linear-gradient(135deg, var(--accent-a), var(--accent-b)); color: #fff; }
.fab-motivate { background: linear-gradient(135deg, #ec4899, #f59e0b); color: #fff; }

/* ── Modals ─────────────────────────────────────────────── */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(13,17,23,.55);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.modal.active { display: flex; animation: fadeIn .18s ease; }

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.modal-box {
  background: var(--surface-card);
  border-radius: var(--r-xl);
  max-width: 600px;
  width: 100%;
  max-height: 84vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--surface-border);
  animation: modalPop .22s ease;
}

.modal-box--sm { max-width: 420px; }

@keyframes modalPop {
  from { opacity: 0; transform: scale(.96) translateY(8px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-box::-webkit-scrollbar { width: 5px; }
.modal-box::-webkit-scrollbar-thumb { background: var(--surface-border); border-radius: 4px; }

.modal-head {
  padding: 1.4rem 1.75rem;
  border-bottom: 1px solid var(--surface-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  background: var(--surface-card);
  z-index: 1;
  border-radius: var(--r-xl) var(--r-xl) 0 0;
}

.modal-head h2 {
  font-size: 1.2rem;
  font-weight: 900;
  color: var(--text-primary);
  letter-spacing: -.025em;
}

.modal-close-btn {
  background: var(--surface-inset);
  border: 1.5px solid var(--surface-border);
  color: var(--text-secondary);
  width: 34px;
  height: 34px;
  border-radius: 50%;
  cursor: pointer;
  font-size: .9rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--ease);
  font-family: inherit;
  line-height: 1;
}

.modal-close-btn:hover {
  background: #fef2f2;
  color: var(--color-danger);
  border-color: #fecaca;
  transform: rotate(90deg);
}

body.dark-mode .modal-close-btn:hover { background: rgba(239,68,68,.12); }

.modal-body { padding: 1.6rem 1.75rem; }

.method-card {
  background: var(--surface-inset);
  border: 1px solid var(--surface-border);
  border-radius: var(--r-md);
  padding: 1.15rem 1.35rem;
  margin-bottom: .9rem;
  transition: border-color var(--ease);
}

.method-card:hover { border-color: rgba(99,102,241,.28); }
.method-card:last-child { margin-bottom: 0; }

.method-card h3 {
  font-size: .95rem;
  font-weight: 800;
  color: var(--accent-a);
  margin-bottom: .55rem;
  display: flex;
  align-items: center;
  gap: .4rem;
}

.method-card p {
  color: var(--text-secondary);
  font-size: .87rem;
  line-height: 1.65;
  margin-bottom: .65rem;
}

.method-card ul {
  color: var(--text-secondary);
  padding-left: 1.25rem;
  font-size: .84rem;
  line-height: 1.85;
}

/* ── Quote Card ─────────────────────────────────────────── */
.quote-card {
  background: linear-gradient(135deg, var(--accent-a), var(--accent-b));
  border-radius: var(--r-lg);
  padding: 2rem 1.75rem;
  color: #fff;
  text-align: center;
  margin-bottom: 1rem;
  position: relative;
  overflow: hidden;
  box-shadow: 0 8px 28px rgba(99,102,241,.28);
}

.quote-card::before {
  content: '';
  position: absolute;
  width: 200px;
  height: 200px;
  background: rgba(255,255,255,.07);
  border-radius: 50%;
  top: -60px;
  right: -50px;
  pointer-events: none;
}

.quote-decormark {
  font-size: 4rem;
  font-family: Georgia, serif;
  line-height: .7;
  opacity: .35;
  margin-bottom: .5rem;
}

.quote-text {
  font-size: 1.02rem;
  font-style: italic;
  line-height: 1.7;
  font-weight: 400;
  margin-bottom: .9rem;
}

.quote-author {
  font-size: .84rem;
  opacity: .78;
  font-weight: 600;
  margin-bottom: 0;
}

.quote-refresh-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 1.1rem;
  background: rgba(255,255,255,.18);
  color: #fff;
  border: 1.5px solid rgba(255,255,255,.38);
  padding: .55rem 1.3rem;
  border-radius: var(--r-sm);
  cursor: pointer;
  font-weight: 700;
  font-size: .84rem;
  font-family: inherit;
  transition: all var(--ease);
}

.quote-refresh-btn:hover {
  background: #fff;
  color: var(--accent-a);
  transform: translateY(-1px);
}

/* ── Theme Grid ─────────────────────────────────────────── */
.theme-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: .65rem;
}

.theme-swatch {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .45rem;
  padding: 1.1rem .75rem;
  border-radius: var(--r-md);
  cursor: pointer;
  border: 3px solid transparent;
  transition: all var(--ease);
  color: #fff;
  font-size: .82rem;
  font-weight: 700;
  user-select: none;
}

.theme-swatch span:first-child { font-size: 1.5rem; line-height: 1; }

.theme-swatch:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.theme-swatch.active { border-color: #fff; box-shadow: 0 0 0 4px rgba(255,255,255,.18), var(--shadow-md); }

.theme-sw-default { background: linear-gradient(135deg, #6366f1, #8b5cf6); }
.theme-sw-ocean   { background: linear-gradient(135deg, #0ea5e9, #06b6d4); }
.theme-sw-forest  { background: linear-gradient(135deg, #10b981, #059669); }
.theme-sw-sunset  { background: linear-gradient(135deg, #f59e0b, #f97316); }
.theme-sw-cherry  { background: linear-gradient(135deg, #ec4899, #db2777); }
.theme-sw-purple  { background: linear-gradient(135deg, #8b5cf6, #7c3aed); }

/* ── Focus Overlay ──────────────────────────────────────── */
.focus-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: #000;
  color: #fff;
  z-index: 9999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 2rem;
}

.focus-overlay.active { display: flex; }

.focus-overlay-exit {
  position: fixed;
  top: 14px;
  right: 14px;
  background: rgba(255,255,255,.12);
  color: #fff;
  border: 1.5px solid rgba(255,255,255,.22);
  border-radius: var(--r-sm);
  padding: 7px 18px;
  font-weight: 700;
  font-size: .85rem;
  font-family: inherit;
  cursor: pointer;
  backdrop-filter: blur(8px);
  transition: all var(--ease);
}

.focus-overlay-exit:hover {
  background: rgba(255,255,255,.24);
  transform: translateY(-1px);
}

.focus-overlay-hint {
  display: none;
  margin-top: 52px;
  padding: 10px 14px;
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 10px;
  font-size: .84rem;
  font-weight: 600;
  color: rgba(255,255,255,.75);
  text-align: center;
  max-width: 520px;
}

@media (orientation: portrait) {
  .focus-overlay.active .focus-overlay-hint { display: block; }
}

.focus-overlay-label {
  opacity: .55;
  font-size: clamp(12px, 3vw, 18px);
  letter-spacing: .15em;
  text-transform: uppercase;
  font-weight: 700;
}

/* ── Flip Clock ─────────────────────────────────────────── */
.flip-clock {
  display: grid;
  grid-auto-flow: column;
  align-items: center;
  gap: clamp(10px, 2vw, 18px);
}

.flip-card {
  position: relative;
  width: clamp(110px, 22vw, 250px);
  height: clamp(155px, 26vw, 310px);
  background: #0a0a0a;
  border-radius: clamp(14px, 2.2vw, 24px);
  box-shadow: 0 28px 72px rgba(0,0,0,.55), inset 0 1px 0 rgba(255,255,255,.05);
  overflow: hidden;
}

.flip-digit {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Inter, Arial, sans-serif;
  font-weight: 800;
  font-size: clamp(80px, 15vw, 185px);
  color: #fff;
  letter-spacing: -.05em;
}

.flip-line {
  position: absolute;
  left: 0; right: 0;
  top: 50%;
  transform: translateY(-50%);
  height: 1.5px;
  background: rgba(0,0,0,.45);
}

.flip-sep {
  font-size: clamp(48px, 10vw, 120px);
  font-weight: 900;
  color: rgba(255,255,255,.55);
  line-height: 1;
  padding-bottom: 6px;
}

/* ── Responsive ─────────────────────────────────────────── */
@media (max-width: 980px) {
  .study-main {
    padding: 1.5rem 1rem 5rem;
  }

  .timer-card {
    padding: 1.75rem 1.5rem 1.5rem;
  }
}

@media (max-width: 640px) {
  .toolbar-inner { padding: 0 1rem; }

  .study-hero { padding: 2.5rem 1.25rem 3rem; }

  .mode-pills { flex-direction: column; gap: .3rem; }
  .mode-pill  { flex-direction: row; justify-content: center; gap: .5rem; }

  .ring-wrap, .ring-circle {
    width: 220px;
    height: 220px;
  }

  .ring-time { font-size: 3rem; }

  .stats-row { grid-template-columns: repeat(3, 1fr); gap: .5rem; }

  .timer-controls { gap: .45rem; }
  .ctrl-btn { padding: .72rem 1.1rem; font-size: .84rem; }

  .info-cards { grid-template-columns: 1fr; }

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

  .fab-group { bottom: 1.25rem; right: 1.25rem; }

  .kbd-hints { display: none; }
}