/* ============================================================
   Guitar Teacher — 统一设计体系 「漆面玫瑰木 Lacquered Rosewood」
   所有页面共享的 CSS 变量、重置、排版、通用组件
   ============================================================ */

:root {
  /* ---- 木色底层 ---- */
  --wood-deepest: #1f110a;
  --wood-deeper: #2e1c12;
  --wood-dark: #3d2618;
  --wood-medium: #5c3a24;
  --wood-warm: #7d4e32;
  --wood-light: #a86e48;

  /* ---- 金色强调 ---- */
  --gold-primary: #f0c060;
  --gold-bright: #ffe08a;
  --gold-warm: #d4a030;
  --gold-pale: #f5e6d3;
  --gold-dim: #b8945c;

  /* ---- 功能色 ---- */
  --green: #5cb870;
  --green-glow: rgba(92,184,112,0.5);
  --red: #e05555;
  --red-glow: rgba(224,85,85,0.5);
  --blue: #5b9bd5;
  --blue-glow: rgba(91,155,213,0.4);
  --orange: #e6a817;

  /* ---- 文字 ---- */
  --text-primary: #f5e6d3;
  --text-secondary: #c4aa88;
  --text-muted: #8a7565;

  /* ---- 边框 ---- */
  --border-subtle: rgba(240,192,96,0.12);
  --border-medium: rgba(240,192,96,0.28);
  --border-glow: rgba(240,192,96,0.5);

  /* ---- 阴影 ---- */
  --shadow-xs: 0 2px 6px rgba(0,0,0,0.2);
  --shadow-sm: 0 4px 14px rgba(0,0,0,0.3);
  --shadow-md: 0 8px 28px rgba(0,0,0,0.4);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.55);
  --shadow-glow: 0 0 36px rgba(240,192,96,0.12);
  --shadow-glow-strong: 0 0 48px rgba(240,192,96,0.2);

  /* ---- 圆角 ---- */
  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-pill: 50px;

  /* ---- 动效 ---- */
  --ease-out: cubic-bezier(0.22, 0.61, 0.36, 1);
  --ease-in-out: cubic-bezier(0.45, 0, 0.55, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-back: cubic-bezier(0.68, -0.4, 0.27, 1.4);
  --duration-fast: 0.18s;
  --duration-normal: 0.3s;
  --duration-slow: 0.5s;

  /* ---- 字体 ---- */
  --font-display: 'Georgia', 'Noto Serif SC', 'STSong', serif;
  --font-body: 'Microsoft YaHei', 'PingFang SC', 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'Cascadia Code', 'Fira Code', 'Consolas', 'Courier New', monospace;
}

/* ---- 全局重置 ---- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ---- 全局滚动条 ---- */
* {
  scrollbar-width: thin;
  scrollbar-color: rgba(200,155,100,0.25) transparent;
}
*::-webkit-scrollbar {
  width: 5px;
  height: 5px;
}
*::-webkit-scrollbar-track {
  background: transparent;
  border-radius: 3px;
}
*::-webkit-scrollbar-thumb {
  background: rgba(200,155,100,0.3);
  border-radius: 3px;
  transition: background var(--duration-normal);
}
*::-webkit-scrollbar-thumb:hover {
  background: rgba(200,155,100,0.55);
}
*::-webkit-scrollbar-corner {
  background: transparent;
}

/* ---- 通用动画 ---- */
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-20px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(30px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.92); }
  to   { opacity: 1; transform: scale(1); }
}
@keyframes gentlePulse {
  0%, 100% { opacity: 0.6; transform: scale(1); }
  50%      { opacity: 1; transform: scale(1.03); }
}
@keyframes shimmer {
  0%   { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* ---- 减少动效偏好 ---- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ---- 通用粒子背景 ---- */
.gt-particle {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  will-change: transform;
}
.gt-particle-gold {
  background: radial-gradient(circle at 35% 30%, rgba(240,192,96,0.35), rgba(200,140,40,0.04));
  box-shadow: 0 0 8px rgba(240,192,96,0.18);
}

/* ---- 通用毛玻璃卡片 ---- */
.gt-glass {
  background: rgba(60,38,24,0.55);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md), var(--shadow-glow);
  transition: transform var(--duration-slow) var(--ease-out),
              box-shadow var(--duration-slow) var(--ease-out),
              border-color var(--duration-slow) var(--ease-out);
}
.gt-glass:hover {
  border-color: var(--border-glow);
  box-shadow: var(--shadow-lg), var(--shadow-glow-strong);
}

/* ---- 通用按钮 ---- */
.gt-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--text-primary);
  background: linear-gradient(135deg, rgba(120,80,50,0.7), rgba(90,55,35,0.7));
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: transform var(--duration-fast) var(--ease-spring),
              box-shadow var(--duration-normal) ease,
              background var(--duration-normal) ease,
              border-color var(--duration-normal) ease;
  text-decoration: none;
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.gt-btn:hover {
  transform: translateY(-2px);
  background: linear-gradient(135deg, rgba(155,100,65,0.8), rgba(120,80,50,0.8));
  border-color: var(--border-glow);
  box-shadow: var(--shadow-sm), 0 0 20px rgba(240,192,96,0.15);
}
.gt-btn:active {
  transform: scale(0.96);
  transition: transform 0.08s ease;
}

.gt-btn-primary {
  background: linear-gradient(135deg, #c49440, #a07030);
  border-color: var(--gold-warm);
  color: #1a0f08;
  font-weight: 700;
}
.gt-btn-primary:hover {
  background: linear-gradient(135deg, #d4a450, #b08040);
  box-shadow: var(--shadow-sm), 0 0 28px rgba(240,192,96,0.3);
}

.gt-btn-success {
  background: linear-gradient(135deg, rgba(92,184,112,0.3), rgba(70,150,90,0.3));
  border-color: rgba(92,184,112,0.45);
}
.gt-btn-success:hover {
  background: linear-gradient(135deg, rgba(92,184,112,0.5), rgba(70,150,90,0.5));
  box-shadow: var(--shadow-sm), 0 0 20px rgba(92,184,112,0.2);
}

/* ---- 木纹背景纹理（用于 body 或大容器） ---- */
.gt-wood-bg {
  position: relative;
  background-color: var(--wood-deeper);
}
.gt-wood-bg::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse at 30% 15%, rgba(180,120,50,0.1) 0%, transparent 50%),
    radial-gradient(ellipse at 70% 60%, rgba(80,40,20,0.12) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 85%, rgba(200,150,60,0.06) 0%, transparent 40%);
  pointer-events: none;
  z-index: 0;
}
.gt-wood-bg::after {
  content: '';
  position: fixed;
  inset: 0;
  background:
    repeating-linear-gradient(2deg, transparent, transparent 4px, rgba(100,55,25,0.025) 4px, rgba(100,55,25,0.025) 5px),
    repeating-linear-gradient(92deg, transparent, transparent 14px, rgba(0,0,0,0.02) 14px, rgba(0,0,0,0.02) 15px);
  pointer-events: none;
  z-index: 0;
}

/* ---- 渐变金色文字 ---- */
.gt-text-gold {
  background: linear-gradient(135deg, var(--gold-bright), var(--gold-warm));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

/* ---- 分区标题 ---- */
.gt-section-title {
  color: var(--gold-primary);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 12px;
  position: relative;
  display: inline-block;
}
.gt-section-title::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 40px;
  height: 2.5px;
  background: linear-gradient(90deg, var(--gold-primary), transparent);
  border-radius: 2px;
}

/* ---- 输入框统一风格 ---- */
.gt-input {
  width: 100%;
  padding: 12px 18px;
  background: rgba(28,18,10,0.6);
  border: 1.5px solid rgba(180,130,70,0.3);
  border-radius: var(--radius-pill);
  color: var(--text-primary);
  font-size: 0.92rem;
  font-family: var(--font-body);
  outline: none;
  transition: border-color var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out),
              background var(--duration-normal) ease;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2) inset;
}
.gt-input::placeholder {
  color: rgba(180,150,120,0.35);
}
.gt-input:focus {
  border-color: var(--gold-warm);
  box-shadow:
    0 0 0 4px rgba(212,160,48,0.08),
    0 0 20px rgba(212,160,48,0.1),
    0 2px 8px rgba(0,0,0,0.2) inset;
  background: rgba(35,22,14,0.85);
}

/* ---- 下拉选择框统一风格 ---- */
.gt-select {
  background-color: var(--wood-medium);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-pill);
  padding: 10px 16px;
  font-size: 0.9rem;
  font-family: var(--font-body);
  font-weight: 500;
  outline: none;
  cursor: pointer;
  transition: border-color var(--duration-normal) ease,
              box-shadow var(--duration-normal) ease;
  appearance: none;
  -webkit-appearance: none;
}
.gt-select:focus {
  border-color: var(--gold-warm);
  box-shadow: 0 0 0 3px rgba(212,160,48,0.1);
}
.gt-select option {
  background: var(--wood-dark);
  color: var(--text-primary);
}

/* ============================================================
   日间主题 「云杉米白 Spruce Cream」
   ============================================================ */
[data-theme="light"] {
  --wood-deepest: #ddd0b8;
  --wood-deeper: #e8dcc8;
  --wood-dark: #d8c8b0;
  --wood-medium: #c0a880;
  --wood-warm: #987858;
  --wood-light: #826040;

  --gold-primary: #b87830;
  --gold-bright: #d49840;
  --gold-warm: #8b5820;
  --gold-pale: #5a4030;
  --gold-dim: #7a5a3a;

  --text-primary: #3d2e1e;
  --text-secondary: #6b5040;
  --text-muted: #8a7565;

  --border-subtle: rgba(180,130,80,0.18);
  --border-medium: rgba(180,130,80,0.35);
  --border-glow: rgba(180,130,80,0.5);

  --shadow-xs: 0 2px 6px rgba(0,0,0,0.08);
  --shadow-sm: 0 4px 14px rgba(0,0,0,0.12);
  --shadow-md: 0 8px 28px rgba(0,0,0,0.16);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.22);
  --shadow-glow: 0 0 36px rgba(180,130,60,0.1);
  --shadow-glow-strong: 0 0 48px rgba(180,130,60,0.16);
}

[data-theme="light"] body {
  background-color: #ede0cc;
}

[data-theme="light"] .gt-glass {
  background: rgba(245,235,220,0.7);
}

[data-theme="light"] .gt-btn {
  background: linear-gradient(135deg, rgba(180,140,100,0.6), rgba(160,120,80,0.55));
}

[data-theme="light"] .gt-btn:hover {
  background: linear-gradient(135deg, rgba(200,150,110,0.7), rgba(180,130,90,0.65));
}

[data-theme="light"] .gt-btn-primary {
  background: linear-gradient(135deg, #b87830, #8b5820);
  color: #fff;
}

[data-theme="light"] .gt-input {
  background: rgba(245,235,220,0.7);
  border-color: rgba(180,130,80,0.3);
  color: #3d2e1e;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06) inset;
}
[data-theme="light"] .gt-input::placeholder {
  color: rgba(140,110,70,0.4);
}

[data-theme="light"] .gt-input:focus {
  background: rgba(250,242,230,0.9);
  box-shadow: 0 0 0 4px rgba(180,120,50,0.08), 0 0 16px rgba(180,120,50,0.08), 0 2px 8px rgba(0,0,0,0.06) inset;
}

[data-theme="light"] .gt-select {
  background-color: #e0d0b8;
  color: #3d2e1e;
}

[data-theme="light"] .gt-select option {
  background: #f0e5d4;
  color: #3d2e1e;
}

[data-theme="light"] .gt-wood-bg {
  background-color: #f0e5d4;
}

[data-theme="light"] .gt-section-title {
  color: #8b5820;
}