/* ═══════════════════════════════════════════════════════════════
   Study Zone — page-specific styles
   Accent: --neon-teal (#00C2CC)
   Optimized for sustained reading — generous padding, soft surfaces,
   calm transitions, left-border state indicators (never full fills).
   Global design system lives in css/styles.css
   ═══════════════════════════════════════════════════════════════ */

/* ── Local color tokens ── */
:root {
  --teal:    #00C2CC;
  --teal-dim: #008B94;
  --correct: #22C55E;
  --wrong:   #EF4444;
}

/* ── Gate accent overrides (teal instead of default pink) ── */
.gate-overlay::before {
  background: radial-gradient(circle, rgba(0, 194, 204, 0.08) 0%, transparent 65%);
}

.gate-card {
  box-shadow: 0 0 60px rgba(0, 194, 204, 0.07), 0 32px 64px rgba(0, 0, 0, 0.45);
}

.gate-emoji {
  color: var(--neon-teal);
  filter: drop-shadow(0 0 8px rgba(0, 194, 204, 0.5));
  --ph-duotone-opacity: 0.3;
}

.gate-digit:focus {
  border-color: var(--neon-teal);
  box-shadow: 0 0 0 1px var(--neon-teal), 0 0 20px rgba(0, 194, 204, 0.2);
}

/* Teal btn-primary: dark text because teal is light enough */
.btn-primary {
  background: var(--neon-teal);
  color: #07071A;
  box-shadow: 0 0 20px rgba(0, 194, 204, 0.3);
}

.btn-primary:hover {
  box-shadow: 0 0 36px rgba(0, 194, 204, 0.5);
}

.btn-outline:hover {
  border-color: var(--neon-teal);
  color: var(--neon-teal);
  background: rgba(0, 194, 204, 0.05);
}

/* ── Hero (subtle — this page is for work, not spectacle) ── */
.study-hero {
  text-align: center;
  padding: 40px 20px 24px;
}

.study-hero-icon {
  font-size: 38px;
  color: var(--neon-teal);
  display: block;
  margin: 0 auto 14px;
  filter: drop-shadow(0 0 8px rgba(0, 194, 204, 0.45));
  --ph-duotone-opacity: 0.3;
}

.study-title {
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: clamp(26px, 4vw, 36px);
  color: var(--text-primary);
  margin: 0 0 8px;
  letter-spacing: -0.02em;
}

.study-sub {
  font-size: 14px;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.55;
  font-family: 'Satoshi', sans-serif;
}

/* ── Daily goal banner ── */
.daily-banner-wrap {
  max-width: 760px;
  margin: 0 auto 12px;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.daily-banner {
  flex: 1;
  background: linear-gradient(135deg, rgba(0, 194, 204, 0.15) 0%, rgba(0, 139, 148, 0.1) 100%);
  border: 1px solid rgba(0, 194, 204, 0.25);
  border-radius: 16px;
  padding: 16px 20px;
}

.daily-label {
  font-family: 'Satoshi', sans-serif;
  font-size: 10px;
  font-weight: 500;
  color: var(--neon-teal);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  display: block;
}

.daily-progress-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 8px 0 6px;
}

.daily-track {
  flex: 1;
  height: 6px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  overflow: hidden;
}

.daily-fill {
  height: 100%;
  background: var(--neon-teal);
  border-radius: 999px;
  transition: width 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: 0 0 8px rgba(0, 194, 204, 0.5);
}

.daily-count {
  font-family: 'Geist Mono', monospace;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
}

.daily-status {
  font-family: 'Satoshi', sans-serif;
  font-size: 13px;
  color: var(--text-secondary);
  display: block;
}

/* ── Stats toggle button ── */
.stats-toggle-btn {
  flex-shrink: 0;
  padding: 9px 16px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  font-family: 'Satoshi', sans-serif;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 6px;
}

.stats-toggle-btn:hover,
.stats-toggle-btn[aria-expanded="true"] {
  border-color: var(--neon-teal);
  color: var(--neon-teal);
}

/* ── Stats panel ── */
.stats-panel {
  max-width: 760px;
  margin: 0 auto 20px;
  padding: 0 20px;
}

.stats-inner {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.stat-chip {
  flex: 1;
  min-width: 90px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 14px 12px;
  text-align: center;
}

.stat-num {
  display: block;
  font-family: 'Geist Mono', monospace;
  font-size: 26px;
  font-weight: 500;
  color: var(--neon-teal);
}

.stat-lbl {
  display: block;
  font-size: 10px;
  font-weight: 500;
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 4px;
  font-family: 'Satoshi', sans-serif;
}

/* ── Quiz section ── */
.quiz-section {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 20px 32px;
}

.quiz-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.quiz-heading {
  font-family: 'Syne', sans-serif;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.quiz-cards {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 20px;
}

/* ── Question card — generous padding for readability ── */
.qcard {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 28px 26px 22px;
  transition: border-color 0.2s;
}

.qcard.answered-correct {
  border-color: rgba(34, 197, 94, 0.4);
}

.qcard.answered-wrong {
  border-color: rgba(239, 68, 68, 0.3);
}

/* ── Question meta row (difficulty badge + category) ── */
.qcard-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}

.diff-badge {
  font-family: 'Geist Mono', monospace;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.07em;
  padding: 3px 9px;
  border-radius: 6px;
}

.diff-easy {
  background: rgba(34, 197, 94, 0.12);
  color: #22C55E;
  border: 1px solid rgba(34, 197, 94, 0.25);
}

.diff-medium {
  background: rgba(245, 158, 11, 0.12);
  color: #F59E0B;
  border: 1px solid rgba(245, 158, 11, 0.25);
}

.diff-hard {
  background: rgba(239, 68, 68, 0.12);
  color: #EF4444;
  border: 1px solid rgba(239, 68, 68, 0.25);
}

.category-tag {
  font-size: 11px;
  color: var(--text-faint);
  font-weight: 500;
  letter-spacing: 0.04em;
  font-family: 'Satoshi', sans-serif;
}

/* ── Question text — the critical reading typography ── */
.qcard-question {
  font-family: 'Satoshi', sans-serif;
  font-size: 16px;
  font-weight: 400;        /* regular weight — less visual noise */
  color: var(--text-primary);
  line-height: 1.75;       /* generous for extended reading */
  margin: 0 0 20px;
}

/* ── Answer options — left-border state indicator, no full fill ── */
.qcard-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.qcard-option {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 13px 16px;
  border: 1px solid var(--border-subtle);
  border-left: 3px solid transparent;
  border-radius: 10px;
  cursor: pointer;
  font-family: 'Satoshi', sans-serif;
  font-size: 14px;
  line-height: 1.55;
  color: var(--text-primary);
  background: var(--bg-surface);
  transition: border-color 0.15s, background 0.15s;
  text-align: left;
  width: 100%;
}

.qcard-option:hover:not(:disabled) {
  border-color: var(--neon-teal);
  background: rgba(0, 194, 204, 0.04);
}

.qcard-option:disabled {
  cursor: default;
}

.qcard-option.selected {
  border-left-color: var(--neon-teal);
  border-color: rgba(0, 194, 204, 0.3);
  background: rgba(0, 194, 204, 0.05);
}

.qcard-option.correct {
  border-left-color: var(--correct) !important;
  border-color: rgba(34, 197, 94, 0.3) !important;
  background: rgba(34, 197, 94, 0.05) !important;
}

.qcard-option.wrong {
  border-left-color: var(--wrong) !important;
  border-color: rgba(239, 68, 68, 0.3) !important;
  background: rgba(239, 68, 68, 0.04) !important;
}

.opt-letter {
  font-family: 'Geist Mono', monospace;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-faint);
  flex-shrink: 0;
  min-width: 18px;
  margin-top: 1px;
}

/* ── Feedback box — soft left-border, no harsh fill ── */
.qcard-feedback {
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: 10px;
  font-family: 'Satoshi', sans-serif;
  font-size: 14px;
  line-height: 1.6;
  display: none;
  border-left: 3px solid transparent;
}

.qcard-feedback.show {
  display: block;
}

.qcard-feedback.correct-fb {
  background: rgba(34, 197, 94, 0.06);
  border-left-color: var(--correct);
  color: var(--text-secondary);
}

.qcard-feedback.wrong-fb {
  background: rgba(239, 68, 68, 0.05);
  border-left-color: var(--wrong);
  color: var(--text-secondary);
}

.fb-label {
  font-weight: 700;
  margin-right: 4px;
  color: var(--text-primary);
}

/* ── Quiz actions ── */
.quiz-actions {
  display: flex;
  justify-content: center;
  margin-bottom: 16px;
}

/* ── Daily goal celebration ── */
.goal-celebrate {
  text-align: center;
  padding: 24px;
  background: rgba(0, 194, 204, 0.05);
  border: 1px solid rgba(0, 194, 204, 0.2);
  border-radius: 14px;
  margin-top: 16px;
}

.celebrate-emoji {
  font-size: 40px;
  display: block;
}

.celebrate-text {
  font-family: 'Syne', sans-serif;
  font-size: 18px;
  font-weight: 700;
  color: var(--neon-teal);
  margin: 10px 0 0;
}

/* ── Bonus question section ── */
.bonus-section {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 20px 32px;
}

.bonus-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.bonus-badge {
  background: rgba(0, 194, 204, 0.12);
  color: var(--neon-teal);
  border: 1px solid rgba(0, 194, 204, 0.3);
  font-family: 'Geist Mono', monospace;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 999px;
}

.bonus-heading {
  font-family: 'Syne', sans-serif;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.bonus-card {
  background: var(--bg-elevated);
  border: 1px solid rgba(0, 194, 204, 0.2);
  border-radius: 14px;
  padding: 24px 24px 20px;
}

.bonus-q {
  font-family: 'Satoshi', sans-serif;
  font-size: 16px;
  font-weight: 400;
  color: var(--text-primary);
  line-height: 1.75;
  margin: 0 0 16px;
}

.bonus-answer {
  background: rgba(0, 194, 204, 0.05);
  border: 1px solid rgba(0, 194, 204, 0.2);
  border-radius: 10px;
  padding: 14px 16px;
  font-family: 'Satoshi', sans-serif;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-secondary);
}

.bonus-answer strong {
  color: var(--neon-teal);
}

/* ── YouTube video section ── */
.video-section {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 20px 32px;
}

.video-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.video-heading {
  font-family: 'Syne', sans-serif;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.video-wrap {
  position: relative;
  padding-bottom: 56.25%;
  border-radius: 14px;
  overflow: hidden;
  background: #000;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}

.yt-frame {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

/* ── Notepad section — comfortable for writing ── */
.notepad-section {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 20px 60px;
}

.notepad-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 13px 18px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  font-family: 'Satoshi', sans-serif;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
  transition: border-color 0.15s;
  gap: 8px;
  box-sizing: border-box;
}

.notepad-toggle > span:first-child {
  display: flex;
  align-items: center;
  gap: 8px;
}

.notepad-toggle:hover {
  border-color: var(--neon-teal);
}

.notepad-toggle[aria-expanded="true"] {
  border-radius: 14px 14px 0 0;
  border-bottom-color: transparent;
}

.toggle-caret {
  font-size: 11px;
  color: var(--text-faint);
  transition: transform 0.2s;
  flex-shrink: 0;
}

.notepad-body {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-top: none;
  border-radius: 0 0 14px 14px;
  padding: 16px 18px 14px;
}

.notepad-input {
  width: 100%;
  box-sizing: border-box;
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  padding: 14px 16px;
  font-family: 'Satoshi', sans-serif;
  font-size: 15px;    /* readable input size */
  line-height: 1.7;
  resize: vertical;
  color: var(--text-primary);
  background: var(--bg-elevated);
  outline: none;
  transition: border-color 0.15s;
}

.notepad-input:focus {
  border-color: var(--neon-teal);
  box-shadow: 0 0 0 1px rgba(0, 194, 204, 0.2);
}

.notepad-input::placeholder {
  color: var(--text-faint);
}

.notepad-footer {
  display: flex;
  justify-content: flex-end;
  margin-top: 10px;
  margin-bottom: 16px;
}

/* ── Saved notes list ── */
.notes-list-wrap {
  /* wrapper div for the toggle + list */
}

.notes-list-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 10px 4px;
  background: none;
  border: none;
  border-top: 1px solid var(--border-subtle);
  font-family: 'Satoshi', sans-serif;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  margin-bottom: 10px;
  transition: color 0.15s;
  box-sizing: border-box;
}

.notes-list-toggle:hover {
  color: var(--neon-teal);
}

.notes-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.note-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 14px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  transition: border-color 0.15s;
}

.note-item:hover {
  border-color: rgba(0, 194, 204, 0.25);
}

.note-main {
  flex: 1;
  min-width: 0;
}

.note-name {
  font-family: 'Satoshi', sans-serif;
  font-weight: 600;
  font-size: 13px;
  color: var(--text-primary);
  cursor: text;
  display: inline;
}

.note-name-input {
  font-weight: 600;
  font-size: 13px;
  color: var(--text-primary);
  border: none;
  border-bottom: 1px solid var(--neon-teal);
  outline: none;
  background: transparent;
  font-family: 'Satoshi', sans-serif;
  max-width: 200px;
}

.note-body {
  font-family: 'Satoshi', sans-serif;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-top: 4px;
}

.note-meta {
  text-align: right;
  flex-shrink: 0;
}

.note-date {
  font-family: 'Geist Mono', monospace;
  font-size: 10px;
  color: var(--text-faint);
  display: block;
  line-height: 1.4;
}

.note-del {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 14px;
  color: var(--text-faint);
  padding: 2px 4px;
  transition: color 0.15s;
}

.note-del:hover {
  color: #EF4444;
}

/* ── btn-sm override ── */
.btn-sm {
  padding: 8px 16px;
  font-size: 13px;
}

/* ── Responsive ── */
@media (max-width: 640px) {
  .study-title { font-size: 24px; }
  .study-hero { padding: 28px 16px 18px; }

  .daily-banner-wrap {
    flex-direction: column;
    align-items: stretch;
    padding: 0 16px;
  }

  .stats-inner { gap: 8px; }
  .stat-chip { min-width: 70px; }

  .qcard { padding: 20px 18px 16px; }

  .quiz-section,
  .bonus-section,
  .video-section,
  .notepad-section {
    padding-left: 16px;
    padding-right: 16px;
  }

  .stats-panel { padding: 0 16px; }
}