/* =============================================
   kolkatamirror.com — 原站红/黑经典风
   沿用: #dc2626 红 / #000000 黑 / 暖色渐变底
   ============================================= */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Noto+Sans+SC:wght@400;500;700;900&display=swap');

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family: 'Noto Sans SC', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: linear-gradient(135deg, #fff5f5 0%, #fff9e6 100%);
  color: #1f2937; line-height: 1.7; overflow-x: hidden;
}

:root {
  --primary: #dc2626;
  --primary-dark: #991b1b;
  --primary-deeper: #7f1d1d;
  --accent: #000000;
  --bg: #fafafa;
  --bg-dark: #ffffff;
  --text: #1f2937;
  --text-body: #4b5563;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --shadow: 0 12px 30px rgba(220, 38, 38, 0.08);
  --shadow-hover: 0 18px 40px rgba(220, 38, 38, 0.14);
  --radius: 14px;
  --radius-sm: 8px;
  --nav-height: 64px;
  --container: 1200px;
  --transition-smooth: cubic-bezier(.4,0,.2,1);
}

.container { width: 92%; max-width: var(--container); margin: 0 auto; }
@media (min-width: 640px) { .container { width: 90%; } }
.text-center { text-align: center; }

/* ---- Animations ---- */
@keyframes fadeUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }
@keyframes pulse-glow { 0%,100% { box-shadow: 0 0 15px rgba(220,38,38,.15); } 50% { box-shadow: 0 0 30px rgba(220,38,38,.3); } }
@keyframes shimmer { 0% { background-position: -200% center; } 100% { background-position: 200% center; } }
@keyframes hero-bg-drift { 0% { background-position: 0% 50%; } 50% { background-position: 100% 50%; } 100% { background-position: 0% 50%; } }

.reveal { opacity: 0; transform: translateY(30px); transition: all .65s var(--transition-smooth); }
.reveal.show { opacity: 1; transform: translateY(0); }
.reveal-left { opacity: 0; transform: translateX(-30px); transition: all .65s var(--transition-smooth); }
.reveal-left.show { opacity: 1; transform: translateX(0); }
.reveal-right { opacity: 0; transform: translateX(30px); transition: all .65s var(--transition-smooth); }
.reveal-right.show { opacity: 1; transform: translateX(0); }
.reveal-scale { opacity: 0; transform: scale(.92); transition: all .6s var(--transition-smooth); }
.reveal-scale.show { opacity: 1; transform: scale(1); }

/* ---- Grids ---- */
.grid-2 { display: grid; grid-template-columns: 1fr; gap: 1.25rem; }
.grid-3 { display: grid; grid-template-columns: 1fr; gap: 1.25rem; }
.grid-4 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (min-width: 640px) { .grid-4 { grid-template-columns: repeat(4, 1fr); } }
@media (min-width: 768px) {
  .grid-2 { grid-template-columns: 1fr 1fr; }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .4rem;
  padding: .6rem 1.6rem; border-radius: 999px; text-decoration: none; font-weight: 600;
  font-size: .85rem; border: none; cursor: pointer;
  transition: all .3s var(--transition-smooth); position: relative; overflow: hidden;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff; box-shadow: 0 8px 20px rgba(220,38,38,.35);
}
.btn-primary:hover { transform: translateY(-3px) scale(1.03); box-shadow: 0 12px 30px rgba(220,38,38,.45); }
.btn-primary:active { transform: translateY(-1px) scale(.98); }
.btn-outline {
  background: #fff; color: var(--text); border: 1.5px solid var(--border);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); background: #ffe8e8; transform: translateY(-2px); }
.btn-sm { padding: .4rem 1.1rem; font-size: .75rem; }
.btn-lg { padding: .7rem 1.8rem; font-size: .9rem; }
.btn-block { width: 100%; text-align: center; }
.btn-cursor { cursor: default !important; }

/* ---- Header ---- */
.site-header {
  position: sticky; top: 0; z-index: 1000;
  background: rgba(255,255,255,.95); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 2px 8px rgba(0,0,0,.06);
}
.nav-wrap { display: flex; align-items: center; justify-content: space-between; height: var(--nav-height); }
.nav-brand {
  display: flex; align-items: center; gap: .5rem;
  font-weight: 700; font-size: 1.2rem; color: var(--primary); text-decoration: none;
}
.nav-brand-icon {
  width: 34px; height: 34px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex; align-items: center; justify-content: center; color: #fff; font-size: 1rem;
}
.nav-links { display: none; list-style: none; gap: .1rem; align-items: center; }
@media (min-width: 768px) { .nav-links { display: flex; } }
.nav-links a {
  text-decoration: none; color: var(--text-muted); font-weight: 500; font-size: .78rem;
  padding: .35rem .65rem; transition: color .2s; position: relative;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: -2px; left: 0; width: 0; height: 2px;
  background: var(--primary); transition: width .2s var(--transition-smooth);
}
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.nav-actions { display: none; gap: .5rem; align-items: center; }
@media (min-width: 768px) { .nav-actions { display: flex; } }
.nav-toggle { display: flex; font-size: 1.4rem; cursor: pointer; background: none; border: none; color: var(--text); }
@media (min-width: 768px) { .nav-toggle { display: none; } }
.mobile-menu { max-height: 0; overflow: hidden; transition: max-height .35s; background: #fff; border-bottom: 1px solid var(--border); }
.mobile-menu.open { max-height: 600px; }
.mobile-menu-inner { display: flex; flex-direction: column; padding: .5rem 1rem 1rem; gap: .15rem; }
.mobile-menu-inner a { text-decoration: none; color: var(--text); padding: .5rem 0; font-size: .82rem; border-bottom: 1px solid #f0f0f0; }
.mobile-menu-inner a:hover { color: var(--primary); }
.mobile-actions { display: flex; flex-direction: column; gap: .5rem; padding: .5rem 0; border-top: 1px solid #eee; }

/* ---- Hero ---- */
.hero-section {
  padding-top: calc(var(--nav-height) + .25rem); padding-bottom: 2.5rem;
  color: var(--text); position: relative; overflow: hidden;
}
.hero-section::before {
  content: ''; position: absolute; top: -50%; right: -15%; width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(220,38,38,.04) 0%, transparent 60%);
  pointer-events: none;
}
.hero-grid { display: grid; grid-template-columns: 1fr; gap: 2rem; align-items: center; position: relative; z-index: 1; }
@media (min-width: 768px) { .hero-grid { grid-template-columns: 1.2fr 1fr; } }
@media (max-width: 767px) { .hero-right { order: -1; } }
.hero-badge {
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .3rem .75rem; border-radius: 999px;
  background: #ffe8e8; border: 1px solid #ffcccc;
  font-size: .68rem; color: var(--primary-deeper); margin-bottom: .7rem;
}
.hero-left h1 {
  font-size: clamp(1.45rem, 3.2vw, 2.4rem); font-weight: 800;
  line-height: 1.25; margin-bottom: .6rem; color: #1a252f;
}
.hero-left h1 .highlight {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-left p { color: var(--text-body); font-size: clamp(.85rem, 1.2vw, .98rem); margin-bottom: 1rem; max-width: 540px; }
.hero-left p strong { color: var(--primary); font-weight: 600; }
.hero-right img {
  width: 100%; max-width: 500px; border-radius: var(--radius);
  box-shadow: 0 15px 40px rgba(0,0,0,.1);
  animation: float 5s ease-in-out infinite;
}
.hero-buttons { display: flex; flex-wrap: wrap; gap: .65rem; margin-bottom: .75rem; }
.hero-kws { display: flex; flex-wrap: wrap; gap: .3rem; }
.hero-kw {
  font-size: .6rem; padding: .12rem .5rem; border-radius: 999px;
  background: #ffe8e8; color: var(--primary-dark); border: 1px solid #ffcccc;
  transition: all .25s; cursor: default;
}
.hero-kw:hover { transform: translateY(-1px); background: var(--primary); color: #fff; border-color: var(--primary); }

/* ---- Hero Side Card ---- */
.hero-side-card {
  background: var(--bg-dark); border-radius: 18px; border: 1px solid var(--border);
  padding: 1.25rem; box-shadow: var(--shadow);
}
.hero-side-card h3 { font-size: 1rem; margin-bottom: .1rem; color: var(--text); }
.hero-side-card .hsc-sub { font-size: .7rem; color: var(--text-muted); margin-bottom: .75rem; }
.hsc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: .55rem; }
.hsc-item { padding: .55rem; background: #fffbf0; border-radius: 10px; border: 1px solid #ffe8cc; }
.hsc-item .hsc-l { font-size: .62rem; color: var(--text-muted); }
.hsc-item .hsc-v { font-weight: 600; color: var(--primary-deeper); font-size: .72rem; }

/* ---- Tagline Banner ---- */
.tagline-banner {
  background: linear-gradient(90deg, var(--primary), var(--accent), var(--primary));
  background-size: 200% 100%; animation: shimmer 6s linear infinite;
  color: #fff; text-align: center; padding: .7rem 1rem;
}
.tagline-text { font-size: clamp(.9rem, 1.8vw, 1.1rem); font-weight: 800; letter-spacing: .04em; }
.tagline-sub { font-size: .72rem; opacity: .85; margin-top: .05rem; }

/* ---- Section ---- */
.section { padding: 3.5rem 0; }
.section-alt { background: rgba(255,255,255,.55); }
.section-dark {
  background: linear-gradient(135deg, #111827 0%, #000000 100%);
  color: #fff;
}
@media (min-width: 768px) { .section { padding: 4.5rem 0; } }
.section-label {
  display: inline-block; font-size: .62rem; font-weight: 700; letter-spacing: .12em;
  text-transform: uppercase; color: #95a5a6; margin-bottom: .2rem;
}
.section-title {
  font-size: clamp(1.15rem, 2.4vw, 1.7rem); font-weight: 800;
  color: var(--text); margin-bottom: .35rem;
}
.section-title .highlight { color: var(--primary); }
.section-desc {
  color: var(--text-muted); max-width: 42rem; margin: 0 auto 1.25rem;
  font-size: .82rem; line-height: 1.55;
}
.section-dark .section-label { color: rgba(255,255,255,.5); }
.section-dark .section-title { color: #fff; }
.section-dark .section-desc { color: rgba(255,255,255,.65); }

/* ---- Cards ---- */
.card {
  background: var(--bg-dark); border-radius: var(--radius);
  border: 1px solid var(--border); padding: 1.3rem;
  box-shadow: var(--shadow); transition: all .35s var(--transition-smooth);
  position: relative; overflow: hidden;
}
.card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent), var(--primary));
  transform: scaleX(0); transition: transform .4s var(--transition-smooth);
}
.card:hover { transform: translateY(-8px); box-shadow: var(--shadow-hover); }
.card:hover::before { transform: scaleX(1); }
.card-icon {
  width: 48px; height: 48px; border-radius: 50%;
  background: rgba(220,38,38,.08); display: flex; align-items: center; justify-content: center;
  color: var(--primary); font-size: 1.2rem; margin-bottom: .6rem;
  transition: all .35s var(--transition-smooth);
}
.card:hover .card-icon {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff; transform: scale(1.08) rotate(3deg);
  box-shadow: 0 5px 15px rgba(220,38,38,.2);
}
.card-tag {
  display: inline-block; font-size: .58rem; font-weight: 700; padding: .12rem .45rem;
  border-radius: 999px; background: rgba(220,38,38,.08); color: var(--primary);
  margin-bottom: .3rem; transition: all .3s;
}
.card:hover .card-tag { background: var(--primary); color: #fff; }
.card h3 { font-size: .9rem; font-weight: 700; color: var(--primary-deeper); margin-bottom: .25rem; }
.card:hover h3 { color: var(--primary); }
.card p { color: var(--text-body); font-size: .8rem; line-height: 1.5; }
.card ul { margin: .4rem 0 0 1.1rem; }
.card li { font-size: .78rem; color: var(--text-body); margin-bottom: .25rem; }
.tag-row { display: flex; flex-wrap: wrap; gap: .35rem; margin-top: .5rem; }
.tag-row .tag {
  display: inline-flex; padding: .15rem .45rem; border-radius: 999px;
  background: #fff3e0; color: #d84315; font-size: .62rem; border: 1px solid #ffe0b2;
  transition: all .2s;
}
.tag-row .tag:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

/* Dark card */
.card-dark {
  background: rgba(255,255,255,.08); border-radius: var(--radius); padding: 1.3rem;
  backdrop-filter: blur(10px); transition: all .35s var(--transition-smooth);
  border: 1px solid rgba(255,255,255,.06); text-align: center;
}
.card-dark:hover { transform: translateY(-8px); background: rgba(255,255,255,.12); border-color: rgba(220,38,38,.15); }
.card-dark .cd-icon { font-size: 1.4rem; color: #ef4444; margin-bottom: .55rem; transition: transform .35s; }
.card-dark:hover .cd-icon { transform: scale(1.12); }
.card-dark h3 { color: #fff; font-size: .9rem; font-weight: 700; margin-bottom: .25rem; }
.card-dark p { color: rgba(255,255,255,.7); font-size: .78rem; }

/* ---- Stats ---- */
.stats-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: .7rem; text-align: center; }
@media (min-width: 640px) { .stats-grid { grid-template-columns: repeat(4, 1fr); } }
.stat-item { padding: .5rem; }
.stat-num { font-size: clamp(1.3rem, 2.2vw, 1.7rem); font-weight: 800; color: var(--primary); }
.stat-label { font-size: .7rem; color: var(--text-muted); margin-top: .05rem; }
.section-dark .stat-num { color: #ef4444; }
.section-dark .stat-label { color: rgba(255,255,255,.55); }

/* ---- Steps ---- */
.steps-row { display: flex; flex-direction: column; gap: .6rem; max-width: 38rem; margin: 0 auto; }
@media (min-width: 640px) { .steps-row { flex-direction: row; flex-wrap: wrap; justify-content: center; } }
.step-item {
  display: flex; align-items: center; gap: .65rem;
  background: var(--bg-dark); border-radius: var(--radius-sm);
  padding: .7rem .9rem; border: 1px solid var(--border);
  box-shadow: 0 3px 8px rgba(0,0,0,.03);
  transition: all .3s var(--transition-smooth);
}
.step-item:hover { transform: translateX(5px); border-color: var(--primary); box-shadow: 0 5px 15px rgba(220,38,38,.06); }
.step-num {
  width: 32px; height: 32px; min-width: 32px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: .72rem; transition: transform .3s;
}
.step-item:hover .step-num { transform: scale(1.1); }
.step-item strong { color: var(--primary); font-size: .82rem; }
.step-item p { color: var(--text-body); font-size: .75rem; }

/* ---- Testimonials ---- */
.test-card {
  background: var(--bg-dark); border-radius: var(--radius);
  border: 1px solid var(--border); padding: 1.2rem;
  box-shadow: var(--shadow); transition: all .35s var(--transition-smooth);
}
.test-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); border-color: rgba(220,38,38,.1); }
.test-stars { color: #f59e0b; margin-bottom: .35rem; font-size: .78rem; letter-spacing: 1px; }
.test-card blockquote {
  color: var(--text-body); font-size: .78rem; line-height: 1.5; margin-bottom: .6rem;
  font-style: italic; border-left: 3px solid var(--primary); padding-left: .6rem;
}
.test-author { display: flex; align-items: center; gap: .5rem; }
.test-avatar {
  width: 32px; height: 32px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff; display: flex; align-items: center;
  justify-content: center; font-weight: 700; font-size: .65rem;
  transition: transform .3s;
}
.test-card:hover .test-avatar { transform: scale(1.08); }
.test-name { font-weight: 600; font-size: .75rem; color: var(--text); }
.test-title { font-size: .62rem; color: var(--text-muted); }

/* ---- Brand Strip ---- */
.brand-strip { display: flex; flex-wrap: wrap; justify-content: center; gap: .4rem; }
.brand-strip span {
  font-size: .7rem; padding: .25rem .7rem;
  background: var(--bg-dark); border: 1px solid var(--border); border-radius: 999px;
  color: var(--text-body); font-weight: 500;
  transition: all .3s var(--transition-smooth); cursor: default;
}
.brand-strip span:hover { transform: translateY(-2px); border-color: var(--primary); color: var(--primary); box-shadow: 0 4px 10px rgba(220,38,38,.06); }

/* ---- FAQ ---- */
.faq-list { max-width: 44rem; margin: 0 auto; display: flex; flex-direction: column; gap: .5rem; }
.faq-item {
  background: var(--bg-dark); border-radius: var(--radius-sm);
  overflow: hidden; border: 1px solid var(--border);
  box-shadow: 0 3px 8px rgba(0,0,0,.03);
  transition: all .3s;
}
.faq-item:hover { border-color: rgba(220,38,38,.1); }
.faq-question {
  width: 100%; display: flex; align-items: center; justify-content: space-between;
  padding: .7rem 1rem; background: transparent; border: none;
  cursor: pointer; font-weight: 600; font-size: .8rem; text-align: left; color: var(--text);
  transition: background .2s, color .2s;
}
.faq-question:hover { background: #f8f8f8; color: var(--primary); }
.faq-item.active .faq-question { color: var(--primary); }
.faq-icon {
  font-size: .95rem; transition: transform .4s var(--transition-smooth), background .3s;
  font-weight: 700; width: 24px; height: 24px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: rgba(220,38,38,.06); color: var(--primary);
}
.faq-item.active .faq-icon { transform: rotate(225deg); background: var(--primary); color: #fff; }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height .45s var(--transition-smooth); }
.faq-item.active .faq-answer { max-height: 500px; }
.faq-answer-inner { padding: .35rem 1rem .7rem; color: var(--text-body); font-size: .78rem; line-height: 1.55; }

/* ---- Download Layout ---- */
.download-layout {
  display: flex; flex-wrap: wrap; align-items: stretch;
  border-radius: var(--radius); overflow: hidden;
  box-shadow: 0 12px 32px rgba(220,38,38,.1);
}
.qr-panel {
  display: flex; align-items: center; justify-content: center;
  padding: 1.25rem 1.5rem;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff; flex: 0 0 auto; min-width: 200px;
}
.qr-panel h3 { color: #fff; font-size: .95rem; }
.qr-panel p { color: rgba(255,255,255,.85); font-size: .75rem; }
.download-card { background: var(--bg-dark); padding: 1.25rem 1.5rem; flex: 1; }
.download-card h3 { font-size: .9rem; margin-bottom: .25rem; color: var(--primary-deeper); }
.download-card p { font-size: .75rem; color: var(--text-muted); }
.download-buttons { display: flex; flex-wrap: wrap; gap: .5rem; margin: .5rem 0; }
.download-btn {
  padding: .45rem .9rem; border-radius: var(--radius-sm); border: none;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff; font-size: .7rem; font-weight: 600; cursor: pointer;
  text-decoration: none; display: inline-flex; align-items: center; gap: .3rem;
  transition: all .25s var(--transition-smooth);
}
.download-btn:hover { transform: translateY(-2px); box-shadow: 0 5px 15px rgba(220,38,38,.3); }

/* ---- Data Table ---- */
.data-table { width: 100%; border-collapse: separate; border-spacing: 0; font-size: .78rem; overflow: hidden; border-radius: var(--radius-sm); }
.data-table th { background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff; font-weight: 700; padding: .5rem .65rem; text-align: left; }
.data-table td { padding: .45rem .65rem; border-bottom: 1px solid #f0f0f0; color: var(--text-body); transition: all .2s; }
.data-table tr { transition: all .2s; }
.data-table tr:hover td { background: #fff5f5; color: var(--primary-dark); }

/* ---- Contact ---- */
.contact-grid { display: grid; grid-template-columns: 1fr; gap: 1rem; max-width: 40rem; margin: 0 auto; }
@media (min-width: 640px) { .contact-grid { grid-template-columns: 1fr 1fr; } }
.contact-card {
  background: var(--bg-dark); border-radius: var(--radius);
  border: 1px solid var(--border); padding: 1.3rem;
  box-shadow: var(--shadow); text-align: center;
  transition: all .35s var(--transition-smooth);
}
.contact-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); }
.contact-card i { font-size: 1.6rem; color: var(--primary); margin-bottom: .4rem; transition: transform .35s; }
.contact-card:hover i { transform: scale(1.12); }
.contact-card h3 { font-size: .9rem; font-weight: 700; color: var(--primary-deeper); margin-bottom: .3rem; }
.contact-card p { font-size: .78rem; color: var(--text-body); }
.contact-card .val { color: var(--primary); font-weight: 600; }
.contact-card-big { background: var(--bg-dark); border-radius: var(--radius); border: 1px solid var(--border); padding: 1.5rem; box-shadow: var(--shadow); text-align: center; transition: all .35s; max-width: 32rem; margin: 1rem auto 0; }
.contact-card-big:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); }
.contact-card-big .big-icon { font-size: 2rem; margin-bottom: .4rem; }
.contact-card-big h3 { font-size: .95rem; font-weight: 700; color: var(--primary-deeper); margin-bottom: .25rem; }
.contact-card-big p { font-size: .78rem; color: var(--text-body); margin-bottom: .2rem; }

/* ---- CTA Section ---- */
.cta-section { background: linear-gradient(135deg, #111827, #000000); color: #fff; text-align: center; }
.cta-section h2 { font-size: clamp(1.15rem, 2.2vw, 1.6rem); font-weight: 800; margin-bottom: .4rem; }
.cta-section p { color: rgba(255,255,255,.7); margin-bottom: 1rem; font-size: .82rem; }
.cta-actions { display: flex; flex-wrap: wrap; gap: .65rem; justify-content: center; }
.cta-section .btn-primary { background: linear-gradient(135deg, var(--primary), #ef4444); }
.cta-section .btn-outline { background: rgba(255,255,255,.1); color: #fff; border: 1px solid rgba(255,255,255,.2); }
.cta-section .btn-outline:hover { background: rgba(255,255,255,.15); }

/* ---- Footer ---- */
.site-footer {
  background: linear-gradient(135deg, #111827 0%, #000000 100%);
  padding: 2.5rem 0 1.5rem; color: #d1d5db; font-size: .75rem;
}
.footer-top { display: flex; flex-direction: column; align-items: center; text-align: center; margin-bottom: 1.25rem; }
.footer-logo { font-size: 1.1rem; font-weight: 800; color: #fff; display: flex; align-items: center; gap: .4rem; margin-bottom: .6rem; }
.footer-logo i { color: var(--primary); }
.footer-desc { max-width: 30rem; color: rgba(255,255,255,.45); font-size: .72rem; line-height: 1.5; margin-bottom: .75rem; }
.footer-info { display: flex; flex-wrap: wrap; justify-content: center; gap: 1rem; }
.footer-info span { font-size: .72rem; color: rgba(255,255,255,.4); display: flex; align-items: center; gap: .3rem; }
.footer-info i { color: #ef4444; }
.footer-links { display: flex; flex-wrap: wrap; justify-content: center; gap: .8rem; margin-bottom: .8rem; }
.footer-links a { font-size: .72rem; color: rgba(255,255,255,.4); text-decoration: none; transition: all .25s; position: relative; }
.footer-links a::after { content: ''; position: absolute; bottom: -2px; left: 0; width: 0; height: 1px; background: var(--primary); transition: width .25s; }
.footer-links a:hover { color: var(--primary); }
.footer-links a:hover::after { width: 100%; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.06); padding-top: .8rem; text-align: center; }
.footer-bottom p { font-size: .65rem; color: rgba(255,255,255,.3); }

/* ---- Back to Top ---- */
.back-top {
  position: fixed; bottom: 1.5rem; right: 1.5rem; width: 38px; height: 38px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff; border: none; cursor: pointer; font-size: .8rem;
  box-shadow: 0 5px 15px rgba(220,38,38,.3); z-index: 99;
  opacity: 0; visibility: hidden; transition: all .3s var(--transition-smooth);
}
.back-top.show { opacity: 1; visibility: visible; }
.back-top:hover { transform: translateY(-3px); }

::selection { background: rgba(220,38,38,.15); color: #fff; }
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: #f1f1f1; }
::-webkit-scrollbar-thumb { background: linear-gradient(180deg, var(--primary), #991b1b); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary); }