/* ==========================================================================
   巴洛克音響 (ANSBACH ACOUSTIC) 頂級奢華設計系統
   曜石黑 (Obsidian Black) + 香檳金 (Champagne Gold) + 磨砂玻璃 (Glassmorphism)
   ========================================================================== */

:root {
  /* 品牌核心主色系 */
  --bg-primary: #0a0c10;
  --bg-secondary: #11141b;
  --bg-tertiary: #171b24;
  --bg-card: rgba(22, 27, 37, 0.85);
  --bg-glass: rgba(18, 22, 30, 0.75);
  --bg-input: rgba(255, 255, 255, 0.05);

  /* 奢華金光色彩層級 */
  --gold-light: #f3dfc1;
  --gold-primary: #c5a880;
  --gold-hover: #dfc196;
  --gold-dark: #967a54;
  --gold-gradient: linear-gradient(135deg, #dfc196 0%, #c5a880 50%, #9a784d 100%);
  --gold-glow: rgba(197, 168, 128, 0.25);
  --gold-border: rgba(197, 168, 128, 0.3);

  /* 文字階層 */
  --text-primary: #f5f6f8;
  --text-secondary: #b0b7c3;
  --text-muted: #727c8d;
  --text-gold: #dfc196;

  /* 輔助與狀態色 */
  --accent-cyan: #4ecdc4;
  --accent-blue: #4a90e2;
  --accent-emerald: #2ecc71;
  --accent-amber: #f39c12;
  --accent-rose: #e74c3c;
  --border-subtle: rgba(255, 255, 255, 0.08);

  /* 圓角與陰影 */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-pill: 9999px;
  --shadow-subtle: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-gold: 0 8px 32px rgba(197, 168, 128, 0.15);
  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.5);

  /* 字體堆疊 */
  --font-serif: 'Playfair Display', 'Noto Serif TC', Georgia, serif;
  --font-sans: Arial, 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans TC', sans-serif;
  --transition-smooth: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  color-scheme: dark;
  font-size: 16px;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  position: relative;
  background-image:
    radial-gradient(circle at 15% 15%, rgba(197, 168, 128, 0.04) 0%, transparent 40%),
    radial-gradient(circle at 85% 65%, rgba(74, 144, 226, 0.03) 0%, transparent 50%),
    linear-gradient(to bottom, #0a0c10, #0c0f14 100%);
  background-attachment: fixed;
}

/* 全域區塊錨點邊距（避讓 80px 固定導覽列） */
section[id], [id] {
  scroll-margin-top: 80px;
}

/* 典雅襯線標題 */
h1, h2, h3, .font-serif, .hero-title, .section-title {
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: 0.02em;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-smooth);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* 金色流光文字效果 */
.gold-text-gradient {
  background: var(--gold-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

/* 容器寬度 */
.container {
  width: 100%;
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 24px;
}

.container-narrow {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 區塊標準間距 */
.section-padding {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 60px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-family: Arial, sans-serif;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold-primary);
  margin-bottom: 16px;
  padding: 4px 16px;
  background: rgba(197, 168, 128, 0.1);
  border: 1px solid var(--gold-border);
  border-radius: var(--radius-pill);
}

.section-title {
  font-size: 2.6rem;
  line-height: 1.25;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* 輔助技術與語意化 H1 專用隱藏樣式 (A11y / Screen Reader Only) */
.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}