/* =============================================
   IBILIEVE 爱笔利 — 官网改版 v2
   6 屏精简结构 · 深浅交替
   ============================================= */

/* ========== Design Tokens ========== */
:root {
  --color-brand: #3B69F2;
  --color-brand-50: #eef2ff;
  --color-brand-100: #dbe4fe;
  --color-brand-200: #bfdbfe;
  --color-brand-500: #3B82F6;
  --color-brand-600: #2563EB;
  --color-brand-700: #1D4ED8;

  --color-dark: #1e293b;
  --color-dark-50: #f1f5f9;
  --color-dark-100: #e2e8f0;
  --color-dark-200: #cbd5e1;
  --color-dark-300: #94a3b8;
  --color-dark-500: #475569;
  --color-dark-700: #334155;

  --color-bg: #f8fafc;
  --color-bg-card: #ffffff;
  --color-bg-alt: rgba(226, 232, 240, 0.4);

  --color-text: #1e293b;
  --color-text-secondary: #475569;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;

  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;

  --font-sans: 'Outfit', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-serif: 'Source Serif 4', 'Songti SC', 'SimSun', serif;
  --font-mono: 'JetBrains Mono', monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  --shadow-sm: 0 1px 3px rgba(20, 20, 19, 0.06);
  --shadow-md: 0 4px 12px rgba(20, 20, 19, 0.08);
  --shadow-lg: 0 10px 30px rgba(20, 20, 19, 0.10);
  --shadow-xl: 0 20px 60px rgba(20, 20, 19, 0.12);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --transition-fast: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);

  --nav-height: 80px;
}

/* ========== Reset & Base ========== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--nav-height); font-size: 16px; }
body {
  font-family: var(--font-serif);
  font-size: var(--text-base);
  line-height: 1.8;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button, input, select, textarea { font-family: var(--font-sans); }
h1, h2, h3, h4, h5, h6 { font-family: var(--font-sans); font-weight: 600; line-height: 1.3; }

/* ========== Container ========== */
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 24px; }
@media (min-width: 768px) { .container { padding: 0 32px; } }

/* ========== Buttons ========== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  padding: var(--space-4) var(--space-8); font-family: var(--font-sans); font-size: var(--text-sm); font-weight: 600;
  line-height: 1; border: none; border-radius: var(--radius-full); cursor: pointer;
  transition: all var(--transition-base); white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--color-brand) 0%, var(--color-brand-500) 100%);
  color: white; box-shadow: 0 4px 16px rgba(59, 105, 242, 0.25);
}
.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-brand-600) 0%, var(--color-brand-700) 100%);
  transform: translateY(-2px); box-shadow: 0 8px 24px rgba(59, 105, 242, 0.3);
}
.btn-ghost { background: transparent; color: var(--color-text); border: 1px solid var(--color-border); }
.btn-ghost:hover { background: white; border-color: var(--color-brand-100); transform: translateY(-2px); box-shadow: var(--shadow-md); }

.btn-outline { display: inline-flex; align-items: center; justify-content: center; padding: var(--space-4) var(--space-8); font-family: var(--font-sans); font-size: var(--text-base); font-weight: 600; color: var(--color-text); background: white; border: 1.5px solid #e2e8f0; border-radius: var(--radius-lg); cursor: pointer; transition: all 0.25s ease; text-decoration: none; }
.btn-outline:hover { border-color: var(--color-brand); color: var(--color-brand); transform: translateY(-2px); box-shadow: 0 4px 12px rgba(59,105,242,0.1); }
.btn-full { width: 100%; }
.btn-play {
  display: inline-flex; align-items: center; justify-content: center;
  width: 24px; height: 24px; border-radius: 50%; background: var(--color-brand); color: white; font-size: 0.7rem;
}

/* ========== Section ========== */
.section { padding: 96px 0; position: relative; }
.section-header { text-align: center; max-width: 620px; margin: 0 auto var(--space-20); }
.section-tag {
  display: inline-block; padding: 0.25rem 0.75rem; font-family: var(--font-sans);
  font-size: var(--text-xs); font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--color-brand); background: var(--color-brand-50); border-radius: var(--radius-full); margin-bottom: var(--space-4);
}
.section-tag--dark { color: var(--color-brand-200); background: rgba(59, 105, 242, 0.12); }
.section-header h2 { font-size: var(--text-3xl); font-weight: 700; line-height: 1.2; margin-bottom: var(--space-4); color: var(--color-text); letter-spacing: -0.01em; }
.section-header p { font-size: var(--text-base); color: var(--color-text-secondary); line-height: 1.7; font-family: var(--font-serif); }
@media (min-width: 768px) { .section { padding: 120px 0; } .section-header h2 { font-size: var(--text-4xl); } }

.text-brand { color: var(--color-brand); }
.text-light { color: rgba(255,255,255,0.9); }
.text-light-muted { color: rgba(255,255,255,0.55); }
.hide-mobile { display: none; }
@media (min-width: 768px) { .hide-mobile { display: inline; } }

/* ========== NAV ========== */
.navbar { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; height: var(--nav-height); background: transparent; transition: all var(--transition-base); }
.navbar.scrolled { background: color-mix(in srgb, var(--color-bg) 92%, transparent); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); box-shadow: 0 1px 0 var(--color-border); }
.nav-container { display: flex; align-items: center; justify-content: flex-start; gap: var(--space-8); height: 100%; }
.nav-logo { flex-shrink: 0; }
.nav-actions { margin-left: auto; display: flex; align-items: center; gap: var(--space-3); }
.nav-logo { display: flex; align-items: center; height: 48px; }
.nav-logo img { height: 100%; width: auto; object-fit: contain; }
.nav-menu { display: none; position: fixed; top: var(--nav-height); left: 0; right: 0; background: var(--color-bg-card); padding: var(--space-6); flex-direction: column; gap: var(--space-2); box-shadow: var(--shadow-lg); border-bottom: 1px solid var(--color-border); }
.nav-menu.active { display: flex; }
.nav-link { display: block; padding: var(--space-3) var(--space-4); font-family: var(--font-sans); font-size: var(--text-sm); font-weight: 500; color: var(--color-text-secondary); border-radius: var(--radius-sm); transition: all var(--transition-fast); }
.nav-link:hover, .nav-link.active { color: var(--color-brand); background: var(--color-brand-50); }
.nav-cta { display: none; padding: var(--space-2) var(--space-6); font-family: var(--font-sans); font-size: var(--text-sm); font-weight: 600; color: white; background: var(--color-brand); border-radius: var(--radius-full); transition: all var(--transition-fast); }
.nav-cta:hover { background: var(--color-brand-600); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(59, 105, 242, 0.3); }
.nav-toggle { display: flex; flex-direction: column; gap: 4px; padding: var(--space-2); background: none; border: none; cursor: pointer; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--color-text); border-radius: 2px; transition: all var(--transition-fast); }
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  /* ===== 语言切换下拉 ===== */
  .lang-switcher { position: relative; }
  .lang-btn {
    display: inline-flex; align-items: center; gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    font-family: var(--font-sans); font-size: var(--text-sm); font-weight: 600;
    color: var(--color-text); background: var(--color-bg-card);
    border: 1px solid var(--color-border); border-radius: var(--radius-full);
    cursor: pointer; transition: all var(--transition-fast); white-space: nowrap;
  }
  .lang-btn:hover { color: var(--color-brand); border-color: var(--color-brand); }
  .lang-btn i.fa-chevron-down { font-size: 0.7rem; transition: transform var(--transition-fast); }
  .lang-switcher.open .lang-btn i.fa-chevron-down { transform: rotate(180deg); }
  .lang-dropdown {
    position: absolute; top: calc(100% + 10px); right: 0; min-width: 132px;
    margin: 0; padding: var(--space-2); list-style: none;
    background: var(--color-bg-card); border: 1px solid var(--color-border);
    border-radius: var(--radius-lg); box-shadow: var(--shadow-lg);
    opacity: 0; visibility: hidden; transform: translateY(-8px);
    transition: all var(--transition-fast); z-index: 1100;
  }
  .lang-switcher.open .lang-dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
  .lang-dropdown li {
    padding: var(--space-2) var(--space-3); border-radius: var(--radius-sm);
    font-family: var(--font-sans); font-size: var(--text-sm);
    color: var(--color-text-secondary); cursor: pointer;
    transition: all var(--transition-fast); white-space: nowrap;
  }
  .lang-dropdown li:hover { background: var(--color-brand-50); color: var(--color-brand); }
  .lang-dropdown li.active { color: var(--color-brand); font-weight: 600; background: var(--color-brand-50); }
  @media (max-width: 768px) {
    .lang-current { display: none; }
    .lang-btn { padding: var(--space-2); }
    .nav-actions { gap: var(--space-2); }
  }
@media (min-width: 1024px) {
  .nav-menu { display: flex !important; position: static; flex-direction: row; background: none; padding: 0; box-shadow: none; border: none; gap: var(--space-3); }
  .nav-link { padding: 0.5rem 1rem; }
  .nav-link:hover, .nav-link.active { background: transparent; color: var(--color-brand); }
  .nav-link.active::after { content: ''; display: block; height: 2px; background: var(--color-brand); border-radius: 2px; margin-top: 2px; }
  .nav-cta { display: inline-flex; }
  .nav-toggle { display: none; }
}

/* ========== HERO ========== */
.hero { position: relative; padding: calc(var(--nav-height) + 32px) 0 48px; background: #ffffff; overflow: hidden; min-height: 100vh; display: flex; flex-direction: column; justify-content: center; }
.hero-bg { position: absolute; top: 0; left: 0; right: 0; bottom: 0; z-index: 0; pointer-events: none; }
.hero-bg img { width: 100%; height: 100%; object-fit: cover; object-position: right center; opacity: 0.8; }
.hero-badge { display: inline-flex; align-items: center; gap: 0.4rem; padding: 0.3rem 1rem; font-family: var(--font-sans); font-size: 0.75rem; font-weight: 500; color: var(--color-brand); background: rgba(59,105,242,0.08); border-radius: 100px; margin-bottom: var(--space-6); }
.hero-badge-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--color-brand); }
.hero-text h1 { font-size: clamp(2.8rem, 5vw, 4rem); font-weight: 700; line-height: 1.1; color: var(--color-text); letter-spacing: -0.025em; margin-bottom: var(--space-6); }
.hero-subtitle { font-family: var(--font-sans); font-size: clamp(0.75rem, 1.2vw, 0.9rem); font-weight: 500; letter-spacing: 0.1em; color: var(--color-text-muted); margin-bottom: var(--space-8); text-transform: uppercase; }
.hero-desc { font-family: var(--font-sans); font-size: var(--text-base); color: var(--color-text-secondary); line-height: 1.8; margin-bottom: 0; max-width: 620px; text-align: justify; text-justify: inter-ideograph; line-break: strict; }
.va-belief p { font-family: 'Outfit', 'PingFang SC', sans-serif !important; font-size: var(--text-base); color: var(--color-text-secondary); line-height: 1.8; max-width: 680px; }
.hero-actions { display: flex; gap: var(--space-4); flex-wrap: wrap; margin-bottom: var(--space-10); }
.hero-text { max-width: 700px; }
/* 英文模式下 HERO 字体缩小适配两行显示 */
html[lang="en"] .hero-text h1 { font-size: clamp(1.8rem, 4vw, 2.8rem); }
html[lang="en"] .hero-badge { font-size: 0.7rem; }
.hero-metrics {
    position: relative; z-index: 3;
    margin-top: var(--space-10);
    padding: var(--space-6) 0 0;
}
.hero-metrics .metrics-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-10);
}
.hero-metrics .metric-item {
    display: flex; flex-direction: column; align-items: center;
    justify-content: center; text-align: center;
}
.hero-metrics .metric-value-row {
    display: flex; align-items: baseline; justify-content: center; gap: var(--space-1);
}
.hero-metrics .metric-number {
    font-family: var(--font-sans);
    font-size: var(--text-3xl);
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.03em;
    line-height: 1.1;
}
.hero-metrics .metric-unit {
    font-family: var(--font-sans);
    font-size: var(--text-lg);
    font-weight: 500;
    color: var(--color-text-muted);
    line-height: 1.1;
}
.hero-metrics .metric-text {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-top: var(--space-2);
    line-height: 1.3;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}
@media (min-width: 768px) {
  .hero { padding: calc(var(--nav-height) + 48px) 0 64px; }
  .hero-text h1 { font-size: clamp(3rem, 5.5vw, 4.5rem); }
  .hero-metrics .metric-number { font-size: var(--text-4xl); }
  .hero-metrics .metric-unit { font-size: var(--text-xl); }
}
@media (max-width: 767px) {
  .hero-bg img { object-position: center 30%; opacity: 0.15; }
  .hero-overlay { background: linear-gradient(180deg, rgba(255,255,255,0.95) 0%, rgba(255,255,255,0.9) 50%, #ffffff 100%); }
  .hero-metrics .metrics-grid { grid-template-columns: repeat(2, 1fr); gap: var(--space-6); }
  .hero-metrics .metric-number { font-size: var(--text-3xl); }
  .hero-metrics .metric-unit { font-size: var(--text-xl); }
}

/* ========== SCREEN 2: STORY DARK ========== */
.story-dark { background: var(--color-dark); color: rgba(255,255,255,0.85); }
.story-dark .container { max-width: 1080px; }
.story-top { display: grid; gap: var(--space-12); align-items: center; margin-bottom: var(--space-16); }
.story-text h2 { font-size: var(--text-5xl); font-weight: 700; color: white; letter-spacing: 0.1em; margin-bottom: var(--space-2); margin-top: var(--space-4); }
.story-origin { font-family: var(--font-sans); font-size: var(--text-lg); color: var(--color-brand-200); font-weight: 600; margin-bottom: var(--space-6); }
.story-origin strong { font-weight: 700; }
.story-body { color: rgba(255,255,255,0.65); line-height: 1.8; margin-bottom: var(--space-4); font-family: var(--font-serif); }
.story-body strong { color: rgba(255,255,255,0.9); }
.story-visual { position: relative; border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-lg); }
.story-visual::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(30, 41, 59, 0.35) 0%, rgba(30, 41, 59, 0.05) 40%, rgba(30, 41, 59, 0.0) 55%, rgba(30, 41, 59, 0.45) 100%);
  border-radius: var(--radius-lg);
  pointer-events: none;
}
.story-building-img { width: 100%; height: 100%; object-fit: cover; display: block; border-radius: var(--radius-lg); aspect-ratio: 16/9; }
@media (min-width: 768px) { .story-top { grid-template-columns: 1fr 1fr; gap: var(--space-10); } }

/* Quote Bar */
.story-quote-bar {
  margin-bottom: var(--space-16); padding: var(--space-8) var(--space-12);
  background: rgba(255,255,255,0.04); border-radius: var(--radius-lg);
  border-left: 4px solid var(--color-brand); position: relative;
}
.story-quote-bar i { color: var(--color-brand-200); font-size: 1.5rem; margin-bottom: var(--space-3); display: block; }
.story-quote-bar blockquote { font-family: var(--font-serif); font-size: var(--text-lg); color: rgba(255,255,255,0.85); line-height: 1.8; font-style: italic; }
.story-quote-bar cite { display: block; margin-top: var(--space-4); font-family: var(--font-sans); font-size: var(--text-sm); font-weight: 600; font-style: normal; color: white; }
.story-quote-bar cite span { font-weight: 400; color: rgba(255,255,255,0.5); }

/* Horizontal Timeline */
.timeline-h { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-8) var(--space-6); position: relative; padding-top: var(--space-4); }
.tl-h-line {
  display: none;
  position: absolute;
  top: calc(var(--space-4) + 22px);
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(to right, rgba(255,255,255,0.08), rgba(59,105,242,0.3), rgba(255,255,255,0.08));
  z-index: 0;
}
.tl-h-item { text-align: center; position: relative; z-index: 2; }
.tl-h-dot {
  width: 48px; height: 48px; border-radius: 50%; margin: 0 auto var(--space-4);
  background: var(--color-dark); border: 2px solid rgba(255,255,255,0.15);
  display: flex; align-items: center; justify-content: center; transition: all var(--transition-base);
  position: relative; z-index: 3;
}
.tl-h-dot span { font-family: var(--font-sans); font-size: 0.75rem; font-weight: 700; color: rgba(255,255,255,0.5); }
.tl-h-dot.active { border-color: var(--color-brand); background: var(--color-brand); box-shadow: 0 0 20px rgba(59,105,242,0.3); }
.tl-h-dot.active span { color: white; }
.tl-h-period { font-family: var(--font-sans); font-size: var(--text-xs); font-weight: 600; color: var(--color-brand-200); letter-spacing: 0.05em; display: block; margin-bottom: var(--space-1); }
.tl-h-item h4 { font-family: var(--font-sans); font-size: var(--text-lg); font-weight: 600; color: white; margin-bottom: var(--space-2); }
.tl-h-item p { font-family: var(--font-serif); font-size: var(--text-sm); color: rgba(255,255,255,0.5); line-height: 1.6; text-align: justify; text-justify: inter-ideograph; line-break: strict; }
@media (min-width: 768px) {
  .timeline-h { grid-template-columns: repeat(4, 1fr); gap: var(--space-4); }
  .tl-h-line { display: block; left: 12.5%; right: 12.5%; }
  .timeline-h { grid-template-columns: repeat(4, 1fr); gap: var(--space-4); }
}

/* ========== SCREEN 3: SOLUTIONS ========== */
.solutions { background: var(--color-bg); }
.scene-grid { display: grid; gap: var(--space-8); }
.scene-card { background: var(--color-bg-card); border: 1px solid var(--color-border); border-radius: var(--radius-lg); overflow: hidden; transition: all var(--transition-base); display: flex; flex-direction: column; }
.scene-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.scene-image { position: relative; height: 200px; overflow: hidden; flex-shrink: 0; }
.scene-image img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--transition-slow); }
.scene-card:hover .scene-image img { transform: scale(1.05); }
.scene-cat { position: absolute; top: var(--space-3); left: var(--space-3); padding: 0.25rem 0.75rem; font-family: var(--font-sans); font-size: 0.75rem; font-weight: 600; border-radius: var(--radius-full); background: rgba(255,255,255,0.95); color: var(--color-text); }
.scene-body { padding: var(--space-6); flex: 1; display: flex; flex-direction: column; }
.scene-cap-tags { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-bottom: var(--space-3); }
.scene-cap-tags span { padding: 0.25rem 0.75rem; font-size: 0.75rem; font-weight: 500; color: var(--color-brand); background: var(--color-brand-50); border-radius: var(--radius-full); }
.scene-body h3 { font-size: var(--text-lg); font-weight: 600; margin-bottom: var(--space-2); line-height: 1.3; }
.scene-body > p { font-family: var(--font-serif); font-size: var(--text-sm); color: var(--color-text-secondary); line-height: 1.6; margin-bottom: var(--space-4); }
.scene-stats { display: flex; gap: var(--space-4); margin-bottom: var(--space-4); padding: var(--space-3) 0; border-top: 1px solid var(--color-border); }
.scene-stats div { flex: 1; text-align: center; }
.scene-stats strong { display: block; font-family: var(--font-sans); font-size: var(--text-lg); font-weight: 700; color: var(--color-brand); }
.scene-stats small { display: block; font-size: 0.7rem; color: var(--color-text-muted); margin-top: 2px; }
.scene-link { display: inline-flex; align-items: center; gap: var(--space-2); font-family: var(--font-sans); font-size: var(--text-sm); font-weight: 600; color: var(--color-brand); transition: gap var(--transition-fast); margin-top: auto; }
.scene-link:hover { gap: var(--space-3); }
@media (min-width: 768px) { .scene-grid { grid-template-columns: repeat(2, 1fr); } }

/* ========== SCREEN 4: TRUST DARK ========== */
.trust-dark { background: var(--color-dark); color: rgba(255,255,255,0.85); }
.trust-dark .section-header h2 { color: white; }
.trust-numbers { display: flex; justify-content: center; gap: var(--space-16); margin-bottom: var(--space-16); flex-wrap: wrap; }
.trust-num { text-align: center; }
.trust-num strong { display: block; font-family: var(--font-sans); font-size: var(--text-5xl); font-weight: 700; color: white; line-height: 1; }
.trust-num span { display: block; font-family: var(--font-sans); font-size: var(--text-sm); color: rgba(255,255,255,0.5); margin-top: var(--space-2); }
.certs-row { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--space-6); margin-bottom: var(--space-16); }
.cert-item { text-align: center; width: 120px; }
.cert-icon { width: 64px; height: 64px; display: flex; align-items: center; justify-content: center; margin: 0 auto var(--space-3); border-radius: 16px; background: rgba(255,255,255,0.08); color: rgba(255,255,255,0.85); font-size: 1.4rem; transition: none; }
.cert-item h4 { font-family: var(--font-sans); font-size: 0.8rem; font-weight: 500; color: rgba(255,255,255,0.55); }
/* ========== PARTNERS - Scrolling Logo Marquee (Dark) ========== */
.partners-section {
    background: transparent;
    padding: var(--space-16) 0;
    position: relative;
    overflow: hidden;
}
.partners-section h3 {
    text-align: center;
    font-family: var(--font-sans);
    font-size: var(--text-lg);
    font-weight: 600;
    color: rgba(255,255,255,0.92);
    margin-bottom: var(--space-8);
}
.partners-scroll {
    overflow: hidden;
    -webkit-mask-image: linear-gradient(to right, transparent, #000 8%, #000 92%, transparent);
    mask-image: linear-gradient(to right, transparent, #000 8%, #000 92%, transparent);
}
.partners-track {
    display: flex;
    gap: var(--space-5);
    width: max-content;
    animation: partnerScroll 40s linear infinite;
}
.partners-scroll:hover .partners-track { animation-play-state: paused; }
@keyframes partnerScroll {
    from { transform: translateX(0); }
    to   { transform: translateX(-50%); }
}
.partner-logo {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
}
.partner-logo img {
    max-height: 56px;
    width: auto;
    object-fit: contain;
    opacity: 0.85;
    transition: none;
}
.partner-logo img:hover {
    opacity: 1;
    filter: drop-shadow(0 6px 18px rgba(130, 175, 255, 0.6));
}
.partners-desc {
    text-align: center;
    font-family: var(--font-sans);
    font-size: 0.82rem;
    color: rgba(255,255,255,0.7);
    line-height: 1.6;
    margin-top: var(--space-8);
}

@media (max-width: 768px) {
    .partner-logo img { max-height: 44px; }
    .partners-track { animation-duration: 28s; }
}

/* ========== SCREEN 5: CONTACT ========== */
.contact { background: var(--color-bg); }
.contact-grid { }

/* Single Contact Card (Apple Style) */
.contact-card { background: white; border-radius: 24px; padding: var(--space-10); }
.contact-card-inner { display: flex; gap: var(--space-10); }
.contact-card-left { flex: 0 0 35%; }
.contact-card-right { flex: 1; min-width: 0; }
.contact-mini-title {
  font-family: var(--font-sans);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-6);
  letter-spacing: -0.01em;
}
.contact-card-header .section-tag { margin-bottom: var(--space-4); display: inline-block; }
.contact-card-header h2 { font-size: var(--text-3xl); font-weight: 700; color: var(--color-text); margin-bottom: var(--space-3); line-height: 1.2; }
.contact-card-header p { font-family: var(--font-sans); font-size: var(--text-base); color: var(--color-text-secondary); line-height: 1.7; }
.contact-card-divider { height: 1px; background: var(--color-border); margin: var(--space-8) 0; }
.contact-card-form .contact-form-header { margin-bottom: var(--space-8); }
.contact-card-form .contact-form-header h2 { font-size: var(--text-2xl); font-weight: 700; color: var(--color-text); margin-bottom: var(--space-3); }
.contact-card-form .contact-form-header p { font-family: var(--font-sans); font-size: var(--text-sm); color: var(--color-text-muted); }

/* Contact Info Column */
.contact-info-col { display: flex; flex-direction: column; background: white; border-radius: 20px; border: none; padding: var(--space-8) var(--space-8) var(--space-5); }
.contact-info-header { margin-bottom: var(--space-6); }
.contact-info-header .section-tag { margin-bottom: var(--space-4); display: inline-block; }
.contact-info-header h2 { font-size: var(--text-3xl); font-weight: 700; color: var(--color-text); margin-bottom: var(--space-3); line-height: 1.2; }
.contact-info-header p { font-family: var(--font-sans); font-size: var(--text-base); color: var(--color-text-secondary); line-height: 1.7; }
.contact-info-list { display: flex; flex-direction: column; }
.contact-info-item {
  display: flex; align-items: center; gap: var(--space-4);
  padding: var(--space-5) 0;
  border-bottom: 1px solid var(--color-border); text-decoration: none;
}
.contact-info-item:last-child { border-bottom: none; }
.contact-info-item:hover { padding-left: 0; }
.contact-info-icon {
  width: 44px; height: 44px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  background: var(--color-brand-50); color: var(--color-brand);
  font-size: 1rem; flex-shrink: 0;
}
.contact-info-body { flex: 1; min-width: 0; }
.contact-info-label { display: block; font-family: var(--font-sans); font-size: var(--text-xs); font-weight: 500; color: var(--color-text-muted); margin-bottom: 2px; }
.contact-info-body strong { font-family: var(--font-sans); font-size: var(--text-sm); font-weight: 600; color: var(--color-text); line-height: 1.5; }
.contact-info-arrow { display: none; }

/* Contact Form Column */
.contact-form-col { background: white; border-radius: 20px; border: none; padding: var(--space-8); }
.contact-form-header { margin-bottom: var(--space-8); }
.contact-form-header h2 { font-size: var(--text-2xl); font-weight: 700; color: var(--color-text); margin-bottom: var(--space-3); }
.contact-form-header p { font-family: var(--font-sans); font-size: var(--text-sm); color: var(--color-text-muted); }

.form-row { display: grid; gap: var(--space-4); margin-bottom: var(--space-4); }
.form-row .form-group { margin-bottom: 0; }
.form-group { margin-bottom: var(--space-4); }
.form-group label { display: block; font-family: var(--font-sans); font-size: var(--text-sm); font-weight: 500; color: var(--color-text); margin-bottom: var(--space-2); }
.form-group .required { color: var(--color-error); margin-left: 2px; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 0.85rem 1rem; font-family: var(--font-sans); font-size: var(--text-sm); color: var(--color-text); background: var(--color-bg); border: 1px solid var(--color-border); border-radius: 12px; transition: all var(--transition-fast); outline: none; }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { border-color: var(--color-brand); box-shadow: 0 0 0 4px rgba(59, 105, 242, 0.12); }
.form-group input::placeholder, .form-group textarea::placeholder { color: var(--color-text-muted); }
.form-group select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364758b' d='M6 8L1 3h10z'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 14px center; padding-right: 2.5rem; }
.form-group textarea { resize: vertical; min-height: 96px; }
.form-note { margin-top: var(--space-4); font-family: var(--font-sans); font-size: 0.75rem; color: var(--color-text-muted); text-align: center; }

@media (min-width: 768px) {
  .contact-grid { }
  .contact-card { padding: var(--space-12); }
  .contact-card-inner { gap: var(--space-12); }
  .form-row { grid-template-columns: 1fr 1fr; }
}

/* ========== FOOTER ========== */
.footer {
    background: var(--color-dark);
    color: rgba(255,255,255,0.7);
    padding: 64px 0 0;
    position: relative;
    overflow: hidden;
}
/* IBILIEVE 大水印背景 */
.footer::before {
    content: '';
    position: absolute;
    bottom: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 90%;
    max-width: 900px;
    height: auto;
    aspect-ratio: 4495 / 858;
    background: url('assets/images/footer-logo.png') no-repeat center / contain;
    opacity: 0.05;
    pointer-events: none;
    z-index: 0;
}
.footer > .container { position: relative; z-index: 1; }
.footer-grid { display: grid; gap: var(--space-8); }
.footer-brand img { height: 48px; width: auto; object-fit: contain; margin-bottom: var(--space-4); }
.footer-slogan { font-family: var(--font-sans); font-size: var(--text-lg); font-weight: 600; color: white; margin-bottom: var(--space-2); }
.footer-desc { font-family: var(--font-serif); font-size: var(--text-sm); line-height: 1.6; }
.footer-links h4, .footer-contact h4 { font-family: var(--font-sans); font-size: var(--text-sm); font-weight: 600; color: white; margin-bottom: var(--space-4); }
.footer-links ul, .footer-contact ul { display: flex; flex-direction: column; gap: var(--space-3); }
.footer-links a, .footer-contact li { font-family: var(--font-serif); font-size: var(--text-sm); color: rgba(255,255,255,0.6); transition: color var(--transition-fast); }
.footer-links a:hover { color: white; }
.footer-contact li i { width: 16px; margin-right: var(--space-2); color: var(--color-brand); }
.footer-tagline { text-align: center; margin-top: var(--space-12); padding: var(--space-8) 0 var(--space-4); font-family: var(--font-sans); font-size: var(--text-lg); font-weight: 600; color: rgba(255,255,255,0.3); letter-spacing: 0.2em; }
.footer-bottom { margin-top: var(--space-10); padding: var(--space-6) 0; border-top: 1px solid rgba(255,255,255,0.1); display: flex; flex-direction: column; gap: var(--space-2); align-items: center; text-align: center; font-family: var(--font-serif); font-size: 0.75rem; color: rgba(255,255,255,0.4); }
@media (min-width: 768px) { .footer-grid { grid-template-columns: 1.5fr 1fr 1fr 1fr; } .footer-bottom { flex-direction: row; justify-content: space-between; } }

/* ========== FLOATING ========== */
.back-to-top { position: fixed; bottom: 24px; right: 24px; z-index: 999; width: var(--space-12); height: var(--space-12); border-radius: 50%; background: var(--color-brand); color: white; border: none; cursor: pointer; font-size: 1rem; opacity: 0; visibility: hidden; transform: translateY(12px); transition: all var(--transition-base); box-shadow: var(--shadow-md); }
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: var(--color-brand-600); transform: translateY(-2px); }
.floating-cta { position: fixed; bottom: 80px; right: 24px; z-index: 999; display: flex; align-items: center; gap: var(--space-2); padding: 0.75rem 1.25rem; background: var(--color-brand); color: white; border-radius: var(--radius-full); font-family: var(--font-sans); font-size: var(--text-sm); font-weight: 600; box-shadow: 0 4px 16px rgba(59, 105, 242, 0.35); opacity: 0; visibility: hidden; transform: translateY(12px); transition: all var(--transition-base); }
.floating-cta.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.floating-cta:hover { background: var(--color-brand-600); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(59, 105, 242, 0.4); }

/* ========== AOS ========== */
[data-aos] { opacity: 0; transform: translateY(24px); transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1); }
[data-aos].aos-animate { opacity: 1; transform: translateY(0); }
[data-aos="fade-right"] { transform: translateX(-24px); }
[data-aos="fade-right"].aos-animate { transform: translateX(0); }
[data-aos="fade-left"] { transform: translateX(24px); }
[data-aos="fade-left"].aos-animate { transform: translateX(0); }

/* ========== PARTICLES ========== */
#heroParticles { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }

/* ========== NOTIFICATION ========== */
.notification { position: fixed; top: 92px; right: 24px; z-index: 10000; display: flex; align-items: center; gap: var(--space-3); padding: var(--space-4) var(--space-6); border-radius: var(--radius-md); font-size: var(--text-sm); font-weight: 500; box-shadow: var(--shadow-lg); max-width: 400px; animation: notifIn 0.3s ease; }
@keyframes notifIn { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
.notification-success { background: color-mix(in srgb, var(--color-success) 10%, white); color: var(--color-success); border: 1px solid color-mix(in srgb, var(--color-success) 30%, white); }
.notification-error { background: color-mix(in srgb, var(--color-error) 10%, white); color: var(--color-error); border: 1px solid color-mix(in srgb, var(--color-error) 30%, white); }

/* ========= 核心能力 ========= */
.capabilities {
  background-color: #F8FAFC;
  background-image: url('assets/images/capabilities-bg.png');
  background-repeat: no-repeat;
  background-position: top right;
  background-size: auto 264px;
  padding-top: 340px;
  position: relative;
}
.capabilities .section-header {
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 264px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  text-align: left;
}
.capabilities .section-header h2 { font-size: clamp(2.2rem, 4vw, 3rem); }
/* 核心能力模块专属：标签文字宽度 */
.capabilities .section-tag {
  display: inline-block;
  align-self: flex-start;
  padding: 0.3rem 0.85rem 0.3rem 10px;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-brand);
  background: rgba(59,105,242,0.08);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-5);
}
/* 核心能力模块宽度对齐第一模块（1200px 容器） */
.capabilities .container { max-width: 1200px; }
/* H5：顶部背景图靠右 + 固定高度 + 底色 #F8FAFC */
@media (max-width: 767px) {
  .capabilities { background-image: none; padding-top: 0; }
  .capabilities .section-header {
    position: static;
    height: auto;
    min-height: 0;
    margin-left: 0;
    margin-right: 0;
    width: auto;
    padding: var(--space-12) 24px var(--space-6);
    background: none;
    background-color: #F8FAFC;
  }
  .capabilities .section-header::after { display: none; }
  .capabilities .section-header > * { position: static; z-index: auto; }
}

.caps-grid {
  display: grid;
  gap: var(--space-6);
}
@media (min-width: 640px) {
  .caps-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
  .caps-grid { grid-template-columns: repeat(4, 1fr); }
}

.cap-card {
  padding: var(--space-8) var(--space-6);
  background: white;
  border-radius: 20px;
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.cap-icon-wrap {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  background: var(--color-bg);
  color: var(--color-brand);
  font-size: 1.2rem;
  margin-bottom: var(--space-5);
}

.cap-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-2);
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.cap-card > p {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-5);
  flex-grow: 1;
}

.cap-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: auto;
}

.cap-tags span {
  padding: 0.2rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  background: var(--color-bg);
  border-radius: var(--radius-full);
}

.cap-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-brand);
  margin-top: var(--space-4);
  text-decoration: none;
}
.cap-link i { font-size: 0.75rem; }

/* ========= 解决方案 ========= */
.services { background: var(--color-bg-card); }

.service-filters {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2);
  margin-bottom: var(--space-8);
}

.filter-btn {
  padding: 0.5rem 1.25rem;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 500;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  border-color: var(--color-brand-100);
  color: var(--color-brand);
  background: var(--color-brand-50);
}

.filter-btn.active {
  background: var(--color-brand);
  color: white;
  border-color: var(--color-brand);
}

.services-grid {
  display: grid;
  gap: var(--space-8);
}

.service-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.service-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.service-card.hidden { display: none; }

.service-image {
  position: relative;
  height: 184px;
  overflow: hidden;
}

.service-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.service-card:hover .service-image img {
  transform: scale(1.05);
}

.service-cat-tag {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  padding: 0.25rem 0.75rem;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  background: white;
  color: var(--color-text);
}

.service-body { padding: var(--space-5); display: flex; flex-direction: column; flex-grow: 1; }

.service-body h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-2);
  line-height: 1.3;
}

.service-body > p {
  font-family: var(--font-serif);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-4);
  flex-grow: 1;
}

.service-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.s-stat {
  text-align: center;
  padding: var(--space-2);
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  min-height: 64px;
}

.s-stat-val {
  display: block;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-brand);
}

.s-stat-lbl {
  display: block;
  font-family: var(--font-serif);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 2px;
}

.service-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-bottom: var(--space-4);
}

.service-tags span {
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  background: var(--color-bg);
  border-radius: var(--radius-full);
}

.service-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-brand);
  transition: gap var(--transition-fast);
}
.service-link:hover { gap: var(--space-3); }

@media (min-width: 768px) {
  .services-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .services-grid { grid-template-columns: repeat(3, 1fr); }
}

/* ========== 响应式断点规范 ==========
   375px → 移动端（单列，最小屏微调）
   768px → 平板端（双列起步）
   1024px → 桌面端（多列）
   以上三档为全站唯一断点基准，禁止引入零散断点。 */
@media (max-width: 375px) {
  .container { padding-left: var(--space-6); padding-right: var(--space-6); }
  .section { padding: 72px 0; }
  .section-header { margin: 0 auto var(--space-16); }
  .section-header h2 { font-size: var(--text-2xl); }
  .hero { padding: calc(var(--nav-height) + 24px) 0 40px; }
  .hero-text h1 { font-size: 2.25rem; letter-spacing: -0.02em; }
  .hero-desc { max-width: 100%; }
  .hero-metrics { margin-top: var(--space-8); }
  .hero-metrics .metrics-grid { gap: var(--space-4); }
  .caps-grid, .services-grid, .scene-grid { gap: var(--space-6); }
  .contact-grid { gap: var(--space-6); }
  .contact-card { padding: var(--space-6) var(--space-6) var(--space-6); }
  .contact-card-inner { flex-direction: column; gap: var(--space-6); }
  .contact-card-left { flex: none; width: 100%; }
  .cap-card, .service-card { padding: var(--space-6); }
  .back-to-top { bottom: var(--space-4); right: var(--space-4); }
  .floating-cta { bottom: 64px; right: var(--space-4); padding: var(--space-2) var(--space-4); }
}