/* ==========================================================================
   The Adult Piano Companion - Design System & Styles
   Minimal, Elegant, Ivory/Ebony Aesthetics for Self-Directed Learners
   ========================================================================== */

:root {
  --bg: #fbfaf7;
  --bg-subtle: #f4f1ea;
  --surface: #ffffff;
  --surface-raised: #ffffff;
  --surface-hover: #faf8f3;
  --border: #e8e4db;
  --border-light: #f0ede6;
  --border-dark: #d5cfc2;

  --ink-primary: #121826;
  --ink-secondary: #4b5568;
  --ink-muted: #738096;
  --ink-faint: #9aa5b6;

  --accent-bronze: #ab7328;
  --accent-bronze-dark: #8c5a1a;
  --accent-bronze-light: #fdf5e8;
  --accent-gold: #c68a35;

  --piano-black: #11141c;
  --piano-ebony: #181d28;
  --piano-ivory: #fffffb;

  --badge-green: #1a4d36;
  --badge-green-bg: #e8f5ee;
  --badge-blue: #1d4ed8;
  --badge-blue-bg: #eff6ff;
  --badge-purple: #6b21a8;
  --badge-purple-bg: #f5f3ff;
  --badge-amber: #b45309;
  --badge-amber-bg: #fef3c7;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px rgba(18, 24, 38, 0.04);
  --shadow-md: 0 4px 12px rgba(18, 24, 38, 0.06);
  --shadow-lg: 0 10px 25px -4px rgba(18, 24, 38, 0.08), 0 4px 10px -2px rgba(18, 24, 38, 0.04);
  --shadow-lift: 0 14px 30px -4px rgba(18, 24, 38, 0.12);

  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Reset & Box Sizing */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg);
  color: var(--ink-primary);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Header & Banner */
header#site-header {
  background: var(--piano-ebony);
  color: #ffffff;
  padding: 2.25rem 1.5rem 2rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  position: relative;
  overflow: hidden;
}

header#site-header::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 35%;
  background: radial-gradient(circle at 85% 20%, rgba(198, 138, 53, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.header-top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.site-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  color: #f1f5f9;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

/* Language Switcher */
.lang-switcher-wrapper {
  display: inline-flex;
  flex-direction: row;
  align-items: center;
  gap: 8px;
}

.lang-row {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: rgba(0, 0, 0, 0.35);
  padding: 3px 4px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.lang-btn {
  background: transparent;
  border: none;
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.lang-btn:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.12);
}

.lang-btn.active {
  background: var(--accent-bronze);
  color: #ffffff;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
}

.secondary-lang-row .lang-btn {
  font-size: 0.8rem;
  opacity: 0.85;
}

.secondary-lang-row .lang-btn.active {
  background: rgba(255, 255, 255, 0.25);
  color: #ffffff;
}

/* Header Headings */
h1#site-title {
  font-family: "Playfair Display", Georgia, "Times New Roman", serif;
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 0.75rem;
  color: #ffffff;
}

p#site-subtitle {
  font-size: 1.05rem;
  color: #cbd5e1;
  max-width: 820px;
  line-height: 1.6;
}

.blog-subtitle-link {
  color: #e2b168;
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: var(--transition-fast);
}

.blog-subtitle-link:hover {
  color: #ffffff;
}

/* Ground Anchor Quote Banner */
.ground-quote-bar {
  margin-top: 1.5rem;
  background: rgba(255, 255, 255, 0.05);
  border-left: 3px solid var(--accent-gold);
  padding: 0.85rem 1.25rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.92rem;
  color: #e2e8f0;
  font-style: italic;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.ground-quote-bar a {
  color: #e2b168;
  font-style: normal;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px dotted #e2b168;
}

.ground-quote-bar a:hover {
  color: #ffffff;
  border-bottom-color: #ffffff;
}

/* Main Container */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* Navigation Tabs */
.nav-tabs-wrapper {
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 20;
  padding-top: 0.5rem;
}

.nav-tabs {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 0.5rem;
}

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

.tab-btn {
  background: transparent;
  border: 1px solid transparent;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink-secondary);
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  white-space: nowrap;
  transition: var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.tab-btn:hover {
  background: var(--bg-subtle);
  color: var(--ink-primary);
}

.tab-btn.active {
  background: var(--piano-ebony);
  color: #ffffff;
  border-color: var(--piano-ebony);
  box-shadow: var(--shadow-sm);
}

/* Section Containers */
section.tab-pane {
  display: none;
  animation: fadeIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

section.tab-pane.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Section Header Typography */
.section-intro {
  margin-bottom: 2rem;
}

.section-title {
  font-family: "Playfair Display", Georgia, serif;
  font-size: 2rem;
  color: var(--ink-primary);
  margin-bottom: 0.4rem;
  letter-spacing: -0.01em;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--ink-secondary);
  max-width: 800px;
}

/* ==========================================================================
   Bilingual Container for Dual Mode
   ========================================================================== */
.bilingual-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.has-secondary-lang .bilingual-grid {
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.bilingual-col-primary {
  min-width: 0;
}

.bilingual-col-secondary {
  min-width: 0;
  border-left: 2px dashed var(--border-dark);
  padding-left: 2rem;
  background: rgba(244, 241, 234, 0.35);
  border-radius: var(--radius-md);
}

.bilingual-badge-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 2px 6px;
  border-radius: 4px;
  margin-bottom: 0.75rem;
  background: var(--border-dark);
  color: var(--ink-secondary);
}

/* ==========================================================================
   Tab 1: Philosophy Section Styles
   ========================================================================== */
.philosophy-hero-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  box-shadow: var(--shadow-sm);
  margin-bottom: 2.5rem;
  position: relative;
  border-left: 5px solid var(--accent-bronze);
}

.philosophy-hero-card h2 {
  font-family: "Playfair Display", Georgia, serif;
  font-size: 1.85rem;
  margin-bottom: 0.75rem;
  color: var(--ink-primary);
}

.philosophy-hero-card p.lead {
  font-size: 1.12rem;
  color: var(--ink-secondary);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.philosophy-quote-box {
  background: var(--bg-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  border: 1px solid var(--border);
  font-style: italic;
  color: var(--ink-primary);
  position: relative;
  font-size: 0.98rem;
}

.philosophy-article {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-sm);
}

.philosophy-article h3 {
  font-family: "Playfair Display", Georgia, serif;
  font-size: 1.45rem;
  margin-bottom: 1.25rem;
  color: var(--ink-primary);
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 0.5rem;
}

.philosophy-article p {
  margin-bottom: 1rem;
  color: var(--ink-primary);
  font-size: 1rem;
}

.philosophy-article p:last-child {
  margin-bottom: 0;
}

.philosophy-article ul {
  margin: 1rem 0 1.25rem 1.5rem;
  color: var(--ink-primary);
}

.philosophy-article li {
  margin-bottom: 0.65rem;
  line-height: 1.6;
}

.philosophy-article blockquote {
  margin: 1.5rem 0;
  padding: 1rem 1.5rem;
  background: var(--accent-bronze-light);
  border-left: 4px solid var(--accent-bronze);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-weight: 500;
  color: var(--accent-bronze-dark);
}

/* ==========================================================================
   Tab 2: Tool Matrix Section Styles
   ========================================================================== */
.controls-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-sm);
}

.search-box {
  position: relative;
  margin-bottom: 1.25rem;
}

.search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.1rem;
  color: var(--ink-muted);
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: 0.8rem 1rem 0.8rem 2.8rem;
  font-size: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg);
  color: var(--ink-primary);
  transition: var(--transition-fast);
  outline: none;
}

.search-input:focus {
  border-color: var(--accent-bronze);
  background: #ffffff;
  box-shadow: 0 0 0 3px rgba(171, 115, 40, 0.15);
}

.filters-wrapper {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.filter-row {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.filter-label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--ink-secondary);
  min-width: 85px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.pill-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.pill-btn {
  background: var(--bg);
  border: 1px solid var(--border);
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--ink-secondary);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition-fast);
}

.pill-btn:hover {
  border-color: var(--ink-muted);
  color: var(--ink-primary);
}

.pill-btn.active {
  background: var(--piano-ebony);
  color: #ffffff;
  border-color: var(--piano-ebony);
}

/* Tool Grid */
.tool-results-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
  font-size: 0.9rem;
  color: var(--ink-muted);
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 1.5rem;
}

.tool-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.6rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: var(--transition-smooth);
  position: relative;
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-dark);
}

.tool-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.85rem;
}

.tool-card-title {
  font-family: "Playfair Display", Georgia, serif;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ink-primary);
  line-height: 1.3;
}

.tool-badge-pill {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.badge-free {
  background: var(--badge-green-bg);
  color: var(--badge-green);
}

.badge-paid {
  background: var(--badge-amber-bg);
  color: var(--badge-amber);
}

.tool-tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 1rem;
}

.tool-tag {
  font-size: 0.75rem;
  background: var(--bg-subtle);
  color: var(--ink-secondary);
  padding: 2px 7px;
  border-radius: 4px;
  border: 1px solid var(--border-light);
}

.tool-summary {
  font-size: 0.95rem;
  color: var(--ink-secondary);
  line-height: 1.55;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.tool-highlights-box {
  background: var(--bg);
  border-radius: var(--radius-md);
  padding: 0.9rem;
  margin-bottom: 1.25rem;
  font-size: 0.86rem;
  border: 1px solid var(--border-light);
}

.tool-highlights-box strong {
  display: block;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
  margin-bottom: 0.35rem;
}

.tool-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 0.85rem;
  border-top: 1px solid var(--border-light);
}

.clickable-card {
  cursor: pointer;
  user-select: none;
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.2s ease, border-color 0.2s ease;
}

.clickable-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent-bronze);
}

.clickable-card:focus-visible {
  outline: 2px solid var(--accent-bronze);
  outline-offset: 3px;
}

.card-open-hint {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--ink-faint);
  transition: transform 0.2s ease, color 0.2s ease;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 2px 4px;
}

.clickable-card:hover .card-open-hint {
  color: var(--accent-bronze);
  transform: translate(2px, -2px);
}

.platform-icons {
  display: flex;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--ink-muted);
}

/* ==========================================================================
   Tab 3: Comparator Section Styles
   ========================================================================== */
.comparator-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  margin-bottom: 2.5rem;
  box-shadow: var(--shadow-sm);
}

.comparator-header {
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 1rem;
}

.comparator-topic {
  font-family: "Playfair Display", Georgia, serif;
  font-size: 1.5rem;
  color: var(--ink-primary);
  margin-bottom: 0.35rem;
}

.comparator-overview {
  font-size: 1rem;
  color: var(--ink-secondary);
}

.comparator-duel-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1.75rem;
}

.duel-column {
  background: var(--bg);
  border-radius: var(--radius-md);
  padding: 1.4rem;
  border: 1px solid var(--border);
}

.duel-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--ink-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.duel-list {
  list-style: none;
}

.duel-list li {
  font-size: 0.92rem;
  line-height: 1.5;
  margin-bottom: 0.65rem;
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.duel-list.pros li::before {
  content: "✓";
  color: #16a34a;
  font-weight: 700;
}

.duel-list.cons li::before {
  content: "✕";
  color: #dc2626;
  font-weight: 700;
}

.comparator-verdict {
  background: var(--accent-bronze-light);
  border-left: 4px solid var(--accent-bronze);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 1.25rem 1.5rem;
}

.verdict-heading {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-bronze-dark);
  margin-bottom: 0.35rem;
}

.verdict-text {
  font-size: 0.98rem;
  color: var(--ink-primary);
  line-height: 1.6;
}

/* ==========================================================================
   Tab 4: Practice Architecture Styles
   ========================================================================== */
.practice-golden-banner {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 5px solid var(--accent-bronze);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  box-shadow: var(--shadow-sm);
  margin-bottom: 2.5rem;
}

.practice-golden-banner .principle-header {
  margin-bottom: 1.75rem;
}

.principle-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  background: var(--accent-bronze-light);
  color: var(--accent-bronze-dark);
  border: 1px solid rgba(171, 115, 40, 0.25);
  margin-bottom: 0.85rem;
}

.principle-title {
  font-family: "Playfair Display", Georgia, serif;
  font-size: 1.75rem;
  color: var(--ink-primary);
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.principle-subtitle {
  font-size: 1.05rem;
  color: var(--ink-secondary);
  line-height: 1.6;
}

.principle-pillars-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.principle-pillar-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  position: relative;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.principle-pillar-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.pillar-badge {
  font-family: "Playfair Display", Georgia, serif;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--accent-bronze);
  margin-bottom: 0.5rem;
  line-height: 1;
}

.pillar-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ink-primary);
  margin-bottom: 0.65rem;
  line-height: 1.4;
}

.pillar-desc {
  font-size: 0.92rem;
  color: var(--ink-secondary);
  line-height: 1.6;
}

.principle-litmus-box {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  background: var(--accent-bronze-light);
  border: 1px solid rgba(171, 115, 40, 0.3);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.75rem;
}

.litmus-icon {
  font-size: 1.75rem;
  flex-shrink: 0;
}

.litmus-content {
  flex-grow: 1;
}

.litmus-quote {
  font-family: "Playfair Display", Georgia, serif;
  font-size: 1.15rem;
  font-style: italic;
  font-weight: 600;
  color: var(--accent-bronze-dark);
  line-height: 1.5;
}

.practice-cycle-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.cycle-step-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.cycle-step-number {
  font-family: "Playfair Display", Georgia, serif;
  font-size: 2.8rem;
  font-weight: 800;
  color: rgba(171, 115, 40, 0.18);
  position: absolute;
  top: 0.5rem;
  right: 1rem;
  line-height: 1;
}

.cycle-step-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--ink-primary);
  margin-bottom: 0.75rem;
  position: relative;
  z-index: 1;
}

.cycle-step-desc {
  font-size: 0.94rem;
  color: var(--ink-secondary);
  line-height: 1.6;
  position: relative;
  z-index: 1;
}

.blueprint-container {
  margin-top: 2rem;
}

.blueprint-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.blueprint-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 0.75rem;
}

.blueprint-badge {
  background: var(--piano-ebony);
  color: #ffffff;
  font-weight: 700;
  font-size: 0.95rem;
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-sm);
}

.blueprint-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ink-primary);
}

.blueprint-timeline {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.timeline-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  background: var(--bg);
  padding: 0.85rem 1.1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
}

.timeline-time {
  font-family: ui-monospace, SFMono-Regular, monospace;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-bronze-dark);
  min-width: 65px;
  background: var(--accent-bronze-light);
  padding: 2px 6px;
  border-radius: 4px;
  text-align: center;
}

.timeline-activity {
  font-size: 0.94rem;
  color: var(--ink-primary);
}

/* ==========================================================================
   Tab 5: Repertoire Ladder Styles
   ========================================================================== */
.ladder-level-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-sm);
}

.ladder-header {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 1rem;
}

.level-indicator {
  background: var(--accent-bronze);
  color: #ffffff;
  font-family: "Playfair Display", Georgia, serif;
  font-size: 1.3rem;
  font-weight: 700;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.level-titles h3 {
  font-family: "Playfair Display", Georgia, serif;
  font-size: 1.4rem;
  color: var(--ink-primary);
  margin-bottom: 0.25rem;
}

.level-titles p {
  font-size: 0.95rem;
  color: var(--ink-muted);
}

.repertoire-pieces-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.25rem;
}

.piece-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.35rem;
}

.piece-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--ink-primary);
  margin-bottom: 0.2rem;
}

.piece-composer {
  font-size: 0.85rem;
  color: var(--accent-bronze-dark);
  font-weight: 600;
  margin-bottom: 0.85rem;
}

.piece-detail-row {
  font-size: 0.9rem;
  margin-bottom: 0.65rem;
  line-height: 1.5;
}

.piece-detail-row strong {
  color: var(--ink-secondary);
}

.piece-tip-box {
  margin-top: 0.85rem;
  padding: 0.75rem;
  background: rgba(255, 255, 255, 0.8);
  border-left: 3px solid var(--accent-bronze);
  border-radius: 0 4px 4px 0;
  font-size: 0.88rem;
  color: var(--ink-primary);
  font-style: italic;
}

/* ==========================================================================
   Modal Drawer for Deep Tool View
   ========================================================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(17, 20, 28, 0.7);
  backdrop-filter: blur(6px);
  z-index: 100;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  animation: fadeIn 0.2s ease;
}

.modal-content {
  background: var(--surface);
  border-radius: var(--radius-xl);
  max-width: 760px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lift);
  border: 1px solid var(--border);
  padding: 2.5rem;
  position: relative;
}

.modal-close-btn {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  width: 36px;
  height: 36px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: var(--ink-secondary);
  transition: var(--transition-fast);
}

.modal-close-btn:hover {
  background: var(--ink-primary);
  color: #ffffff;
}

/* Footer */
footer#site-footer {
  background: var(--piano-black);
  color: #94a3b8;
  padding: 3.5rem 1.5rem 4rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  text-align: center;
  font-size: 0.92rem;
}

.footer-quote {
  max-width: 800px;
  margin: 0 auto 1.5rem;
  font-style: italic;
  color: #e2e8f0;
  font-size: 1.05rem;
  line-height: 1.6;
}

.footer-note {
  color: #64748b;
  font-size: 0.85rem;
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 900px) {
  .has-secondary-lang .bilingual-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .bilingual-col-secondary {
    border-left: none;
    border-top: 2px dashed var(--border-dark);
    padding-left: 0;
    padding-top: 1.5rem;
  }
  .comparator-duel-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 650px) {
  h1#site-title {
    font-size: 1.9rem;
  }
  .header-top-bar {
    flex-direction: column;
    align-items: flex-start;
  }
  .tool-grid {
    grid-template-columns: 1fr;
  }
  .practice-cycle-grid {
    grid-template-columns: 1fr;
  }
  .modal-content {
    padding: 1.5rem;
  }
}

/* ============================================================
   TAB 7: Resources I Enjoy & Aesthetic Inspirations
   ============================================================ */
.favorites-grid {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  margin-top: 1.5rem;
}

.favorite-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-fast);
}

.favorite-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--accent-bronze-light);
}

.favorite-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}

.favorite-author-name {
  font-family: var(--font-serif);
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--ink-primary);
  line-height: 1.25;
}

.favorite-channel-handle {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--accent-bronze-dark);
  margin-top: 0.25rem;
}

.favorite-role-box {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink-secondary);
  margin-bottom: 0.85rem;
  line-height: 1.4;
}

.favorite-tags-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 1.25rem;
}

.favorite-tag {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--ink-muted);
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-full);
}

.favorite-description-box {
  font-size: 0.98rem;
  line-height: 1.65;
  color: var(--ink-primary);
  margin-bottom: 1.25rem;
}

.favorite-why-box {
  background: rgba(247, 245, 240, 0.9);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent-bronze);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 1.25rem 1.4rem;
  margin-bottom: 1.5rem;
}

.favorite-subheading {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--accent-bronze-dark);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.favorite-subcontent {
  font-size: 0.93rem;
  line-height: 1.6;
  color: var(--ink-secondary);
}

.favorite-meta-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.favorite-meta-col {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.15rem;
}

@media (max-width: 768px) {
  .favorite-meta-grid {
    grid-template-columns: 1fr;
  }
  .favorite-card {
    padding: 1.4rem;
  }
}