/* ============================================================
   抖音智能运营助手 · 前台主样式
   设计主题：深空暗黑科技风
   ============================================================ */

:root {
  --bg-deep:    #0B0E14;
  --bg-card:    #161B22;
  --bg-card2:   #1C2128;
  --bg-hover:   #21262d;
  --border:     #30363D;
  --border-hi:  #58A6FF44;
  --c-primary:  #58A6FF;
  --c-accent:   #FF6B35;
  --c-success:  #3FB950;
  --c-purple:   #D2A8FF;
  --c-orange:   #FFA657;
  --c-red:      #F85149;
  --c-text:     #E6EDF3;
  --c-muted:    #8B949E;
  --c-subtle:   #484F58;
  --radius:     10px;
  --radius-lg:  16px;
  --shadow:     0 4px 24px rgba(0,0,0,.4);
  --shadow-glow:0 0 24px rgba(88,166,255,.15);
  --font:       'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono:  'JetBrains Mono', 'Consolas', monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font); background: var(--bg-deep); color: var(--c-text); line-height: 1.65; -webkit-font-smoothing: antialiased; }
a { color: var(--c-primary); text-decoration: none; }
a:hover { color: #79C0FF; }
img { max-width: 100%; }
ul { list-style: none; }

.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }
.section { padding: 5rem 0; }

.ann-bar { display: flex; align-items: center; justify-content: center; gap: .5rem; padding: .55rem 1rem; font-size: .85rem; font-weight: 500; text-align: center; }
.ann-info    { background: #1f3a5f; color: #79c0ff; }
.ann-success { background: #1a4031; color: #56d364; }
.ann-warning { background: #3d2e00; color: #e3b341; }
.ann-danger  { background: #3d0c0c; color: #f85149; }
.ann-icon { font-size: 1rem; }

.navbar { position: sticky; top: 0; z-index: 100; background: rgba(11,14,20,.85); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); }
.nav-inner { display: flex; align-items: center; gap: 2rem; height: 60px; }
.nav-logo { display: flex; align-items: center; gap: .6rem; font-size: 1.1rem; font-weight: 700; color: var(--c-text); }
.nav-links { display: flex; gap: .25rem; margin-left: auto; }
.nav-links a { padding: .4rem .9rem; border-radius: 6px; color: var(--c-muted); font-size: .9rem; transition: color .2s, background .2s; }
.nav-links a:hover, .nav-links a.active { color: var(--c-text); background: var(--bg-hover); }
.btn-nav-cta { padding: .45rem 1.1rem; border-radius: 6px; background: var(--c-primary); color: #0B0E14 !important; font-size: .9rem; font-weight: 600; transition: opacity .2s, transform .2s; white-space: nowrap; }
.btn-nav-cta:hover { opacity: .85; transform: translateY(-1px); }
.nav-toggle { display: none; background: none; border: none; color: var(--c-text); font-size: 1.3rem; cursor: pointer; }

.btn-primary { display: inline-flex; align-items: center; gap: .5rem; padding: .7rem 1.6rem; border-radius: 8px; background: var(--c-primary); color: #0B0E14; font-weight: 600; font-size: .95rem; transition: opacity .2s, transform .15s, box-shadow .2s; cursor: pointer; border: none; }
.btn-primary:hover { opacity: .88; transform: translateY(-2px); box-shadow: 0 4px 20px rgba(88,166,255,.35); color: #0B0E14; }
.btn-primary svg { width: 18px; height: 18px; }
.btn-ghost { display: inline-flex; align-items: center; gap: .5rem; padding: .7rem 1.6rem; border-radius: 8px; border: 1px solid var(--border); color: var(--c-text); font-size: .95rem; transition: border-color .2s, background .2s; cursor: pointer; background: transparent; }
.btn-ghost:hover { border-color: var(--c-primary); background: var(--bg-hover); color: var(--c-text); }
.btn-ghost svg { width: 18px; height: 18px; }
.btn-lg { padding: .85rem 2rem; font-size: 1rem; }
.btn-sm { padding: .4rem .9rem; font-size: .85rem; }
.btn-block { width: 100%; justify-content: center; }
.btn-tag { background: rgba(255,255,255,.15); border-radius: 4px; padding: .1rem .4rem; font-size: .75rem; margin-left: .3rem; }

.hero { position: relative; min-height: calc(100vh - 61px); display: flex; flex-direction: column; align-items: center; justify-content: center; overflow: hidden; text-align: center; padding: 5rem 1.5rem 3rem; }
.hero-bg-grid { position: absolute; inset: 0; background-image: linear-gradient(rgba(88,166,255,.05) 1px, transparent 1px), linear-gradient(90deg, rgba(88,166,255,.05) 1px, transparent 1px); background-size: 50px 50px; pointer-events: none; }
.hero-glow { position: absolute; top: 20%; left: 50%; transform: translateX(-50%); width: 600px; height: 600px; border-radius: 50%; background: radial-gradient(circle, rgba(88,166,255,.1) 0%, transparent 70%); pointer-events: none; }
.hero-content { position: relative; z-index: 1; max-width: 800px; }
.hero-badge { display: inline-flex; align-items: center; gap: .5rem; background: var(--bg-card); border: 1px solid var(--border-hi); border-radius: 20px; padding: .35rem 1rem; font-size: .85rem; color: var(--c-primary); margin-bottom: 1.5rem; }
.badge-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--c-success); box-shadow: 0 0 8px var(--c-success); animation: pulse 2s infinite; }
@keyframes pulse { 0%,100%{opacity:1}50%{opacity:.4} }
.hero-title { font-size: clamp(2.6rem, 6vw, 4.5rem); font-weight: 800; line-height: 1.1; margin-bottom: 1.25rem; }
.gradient-text { background: linear-gradient(135deg, var(--c-primary) 0%, #A5D6FF 50%, var(--c-purple) 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-desc { font-size: 1.1rem; color: var(--c-muted); line-height: 1.8; margin-bottom: 2rem; }
.hero-actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; margin-bottom: 3rem; }
.hero-stats { display: flex; align-items: center; justify-content: center; gap: 0; flex-wrap: wrap; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.25rem 2rem; max-width: 640px; margin: 0 auto; }
.stat-item { text-align: center; padding: 0 1.5rem; }
.stat-num { display: block; font-size: 1.8rem; font-weight: 800; color: var(--c-primary); font-variant-numeric: tabular-nums; }
.stat-label { font-size: .8rem; color: var(--c-muted); }
.stat-divider { width: 1px; height: 36px; background: var(--border); flex-shrink: 0; }
.hero-scroll-hint { position: absolute; bottom: 2rem; left: 50%; transform: translateX(-50%); display: flex; flex-direction: column; align-items: center; gap: .4rem; color: var(--c-subtle); font-size: .75rem; }
.scroll-arrow { width: 16px; height: 16px; border-right: 2px solid var(--c-subtle); border-bottom: 2px solid var(--c-subtle); transform: rotate(45deg); animation: scrollBounce 1.6s ease-in-out infinite; }
@keyframes scrollBounce { 0%,100%{transform:rotate(45deg) translateY(0)}50%{transform:rotate(45deg) translateY(5px)} }

.section-header { text-align: center; margin-bottom: 3.5rem; }
.section-tag { display: inline-block; background: var(--bg-card); border: 1px solid var(--border-hi); border-radius: 20px; padding: .3rem .9rem; font-size: .8rem; color: var(--c-primary); letter-spacing: .05em; text-transform: uppercase; margin-bottom: .9rem; }
.section-header h2 { font-size: 2.2rem; font-weight: 700; margin-bottom: .75rem; }
.section-header p { color: var(--c-muted); font-size: 1rem; max-width: 600px; margin: 0 auto; }

.features-section { background: var(--bg-deep); }
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.25rem; }
.feat-card { position: relative; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.75rem; transition: border-color .2s, box-shadow .2s, transform .2s; }
.feat-card:hover { border-color: var(--border-hi); box-shadow: var(--shadow-glow); transform: translateY(-3px); }
.feat-card--highlight { border-color: rgba(88,166,255,.35); background: linear-gradient(135deg, #161B22 0%, #1a2438 100%); }
.feat-hot-badge { position: absolute; top: 1.2rem; right: 1.2rem; background: var(--c-accent); color: #fff; border-radius: 4px; padding: .2rem .5rem; font-size: .72rem; font-weight: 600; }
.feat-icon { width: 44px; height: 44px; border-radius: 10px; background: color-mix(in srgb, var(--icon-color) 12%, transparent); color: var(--icon-color); display: flex; align-items: center; justify-content: center; margin-bottom: 1rem; }
.feat-icon svg { width: 22px; height: 22px; }
.feat-card h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: .6rem; }
.feat-card p { font-size: .9rem; color: var(--c-muted); line-height: 1.65; margin-bottom: 1rem; }
.feat-tags { display: flex; flex-wrap: wrap; gap: .4rem; }
.feat-tags li { background: var(--bg-hover); border: 1px solid var(--border); border-radius: 4px; padding: .2rem .55rem; font-size: .75rem; color: var(--c-muted); }

.tech-banner { background: linear-gradient(135deg, #0f1923 0%, #161B22 50%, #0f1923 100%); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); padding: 2.5rem 0; }
.tech-banner-inner { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 0; }
.tech-item { display: flex; align-items: center; gap: 1rem; padding: 1rem 2.5rem; }
.tech-icon { font-size: 1.8rem; }
.tech-title { font-weight: 600; margin-bottom: .2rem; }
.tech-sub { font-size: .82rem; color: var(--c-muted); }
.tech-divider { width: 1px; height: 48px; background: var(--border); flex-shrink: 0; }

.steps-section { background: var(--bg-deep); }
.steps-grid { display: flex; align-items: flex-start; justify-content: center; gap: 0; flex-wrap: wrap; }
.step-card { flex: 1; min-width: 220px; max-width: 300px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 2rem 1.5rem; text-align: center; transition: border-color .2s; }
.step-card:hover { border-color: var(--border-hi); }
.step-num { font-size: 2.5rem; font-weight: 800; color: var(--c-primary); font-family: var(--font-mono); opacity: .6; margin-bottom: .75rem; }
.step-card h3 { font-size: 1.05rem; margin-bottom: .6rem; }
.step-card p { font-size: .87rem; color: var(--c-muted); }
.step-arrow { font-size: 1.5rem; color: var(--c-subtle); padding: 0 .75rem; align-self: center; flex-shrink: 0; }

.latest-section { background: var(--bg-card2); }
.latest-preview { max-width: 800px; margin: 0 auto; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 2rem; }
.latest-content h2,.latest-content h3,.latest-content h4 { color: var(--c-primary); margin: 1.25rem 0 .5rem; font-size: 1rem; }
.latest-content ul { padding-left: 1.25rem; margin: .5rem 0; }
.latest-content li { list-style: disc; color: var(--c-muted); font-size: .9rem; line-height: 1.8; }
.latest-content strong { color: var(--c-text); }

.page-header { background: linear-gradient(180deg, var(--bg-card2) 0%, var(--bg-deep) 100%); border-bottom: 1px solid var(--border); padding: 4rem 0 3rem; text-align: center; }
.page-header h1 { font-size: 2.4rem; font-weight: 800; margin: .5rem 0; }
.page-header p { color: var(--c-muted); }

.filter-bar { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: 2.5rem; }
.filter-btn { padding: .4rem 1rem; border-radius: 6px; border: 1px solid var(--border); color: var(--c-muted); font-size: .87rem; transition: all .2s; cursor: pointer; }
.filter-btn:hover,.filter-btn.active { border-color: var(--c-primary); color: var(--c-primary); background: rgba(88,166,255,.08); }

.tutorials-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 1.5rem; }
.tut-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; transition: border-color .2s, transform .2s; }
.tut-card:hover { border-color: var(--border-hi); transform: translateY(-3px); }
.tut-thumb { position: relative; height: 160px; background: linear-gradient(135deg, #0f1923, #1a2438); cursor: pointer; display: flex; align-items: center; justify-content: center; }
.tut-play-btn { position: absolute; width: 56px; height: 56px; border-radius: 50%; background: rgba(88,166,255,.15); border: 2px solid rgba(88,166,255,.4); display: flex; align-items: center; justify-content: center; transition: background .2s, transform .2s; }
.tut-play-btn svg { width: 22px; height: 22px; color: var(--c-primary); margin-left: 3px; }
.tut-thumb:hover .tut-play-btn { background: rgba(88,166,255,.3); transform: scale(1.1); }
.tut-num { position: absolute; top: .75rem; left: .75rem; font-family: var(--font-mono); font-size: .8rem; font-weight: 700; color: var(--c-primary); opacity: .7; }
.tut-duration { position: absolute; bottom: .75rem; right: .75rem; background: rgba(0,0,0,.5); color: #fff; border-radius: 4px; padding: .15rem .45rem; font-size: .75rem; }
.tut-info { padding: 1.25rem; }
.tut-cat { display: inline-block; background: rgba(88,166,255,.12); color: var(--c-primary); border-radius: 4px; padding: .2rem .55rem; font-size: .75rem; margin-bottom: .6rem; }
.tut-title { font-size: 1rem; font-weight: 600; margin-bottom: .5rem; cursor: pointer; }
.tut-title:hover { color: var(--c-primary); }
.tut-desc { font-size: .85rem; color: var(--c-muted); margin-bottom: 1rem; }

.modal-overlay { position: fixed; inset: 0; z-index: 1000; background: rgba(0,0,0,.75); backdrop-filter: blur(4px); display: flex; align-items: center; justify-content: center; opacity: 0; pointer-events: none; transition: opacity .25s; }
.modal-overlay.active { opacity: 1; pointer-events: all; }
.modal-box { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.75rem; width: 90%; max-width: 800px; position: relative; transform: scale(.96); transition: transform .25s; }
.modal-overlay.active .modal-box { transform: scale(1); }
.video-modal-box { max-width: 860px; }
.modal-close { position: absolute; top: 1rem; right: 1rem; background: var(--bg-hover); border: none; border-radius: 50%; width: 30px; height: 30px; cursor: pointer; color: var(--c-muted); font-size: 1rem; display: flex; align-items: center; justify-content: center; }
.modal-close:hover { color: var(--c-text); }
.modal-title { margin-bottom: 1rem; font-size: 1.1rem; }
.video-wrapper { position: relative; width: 100%; padding-bottom: 56.25%; height: 0; background: #000; border-radius: 8px; overflow: hidden; }
.video-wrapper iframe { position: absolute; inset: 0; width: 100%; height: 100%; }
.modal-desc { margin-top: .9rem; color: var(--c-muted); font-size: .88rem; }

.changelog-layout { display: grid; grid-template-columns: 1fr 320px; gap: 2.5rem; align-items: start; }
.timeline { display: flex; flex-direction: column; gap: 0; }
.tl-item { position: relative; padding: 0 0 2rem 2.5rem; border-left: 2px solid var(--border); }
.tl-item:last-child { border-left-color: transparent; }
.tl-dot { position: absolute; left: -7px; top: 4px; width: 12px; height: 12px; border-radius: 50%; background: var(--border); border: 2px solid var(--bg-deep); }
.tl-latest .tl-dot { background: var(--c-primary); box-shadow: 0 0 10px rgba(88,166,255,.5); }
.tl-latest { border-left-color: rgba(88,166,255,.3); }
.tl-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.5rem; transition: border-color .2s; }
.tl-latest .tl-card { border-color: rgba(88,166,255,.3); }
.tl-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: .75rem; flex-wrap: wrap; gap: .5rem; }
.tl-version { font-size: 1.2rem; font-weight: 700; display: flex; align-items: center; gap: .5rem; }
.version-badge { background: var(--c-primary); color: #0B0E14; border-radius: 4px; padding: .15rem .5rem; font-size: .72rem; font-weight: 700; }
.tl-date { color: var(--c-muted); font-size: .85rem; }
.tl-summary { color: var(--c-muted); font-size: .9rem; margin-bottom: 1rem; }
.tl-content h2,.tl-content h3,.tl-content h4 { color: var(--c-primary); margin: 1rem 0 .4rem; font-size: .95rem; }
.tl-content ul { padding-left: 1.25rem; margin: .3rem 0 .75rem; }
.tl-content li { list-style: disc; font-size: .88rem; color: var(--c-muted); line-height: 1.75; }
.tl-content strong { color: var(--c-text); }
.download-btn { margin-top: 1.25rem; }

.changelog-sidebar { position: sticky; top: 80px; }
.download-card { background: var(--bg-card); border: 1px solid rgba(88,166,255,.35); border-radius: var(--radius-lg); padding: 1.75rem; text-align: center; margin-bottom: 1.25rem; box-shadow: 0 0 30px rgba(88,166,255,.08); }
.dl-badge { display: inline-block; background: rgba(88,166,255,.15); color: var(--c-primary); border-radius: 4px; padding: .25rem .7rem; font-size: .78rem; margin-bottom: .9rem; }
.dl-version { font-size: 1.9rem; font-weight: 800; margin-bottom: .25rem; }
.dl-date { color: var(--c-muted); font-size: .85rem; margin-bottom: .5rem; }
.dl-summary { color: var(--c-muted); font-size: .87rem; margin-bottom: 1.25rem; }
.dl-features { text-align: left; margin-top: 1.25rem; display: flex; flex-direction: column; gap: .4rem; }
.dl-features li { font-size: .85rem; color: var(--c-muted); }
.sidebar-note { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.25rem; }
.sidebar-note h4 { font-size: .9rem; margin-bottom: .5rem; }
.sidebar-note p { font-size: .83rem; color: var(--c-muted); }

.empty-state { text-align: center; padding: 4rem 2rem; color: var(--c-muted); }
.empty-icon { font-size: 3rem; margin-bottom: 1rem; }
.empty-state h3 { font-size: 1.1rem; margin-bottom: .5rem; color: var(--c-text); }

.footer { background: var(--bg-card2); border-top: 1px solid var(--border); padding: 3.5rem 0 0; }
.footer-inner { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 3rem; padding-bottom: 3rem; }
.footer-logo { font-size: 1.15rem; font-weight: 700; display: block; margin-bottom: .5rem; }
.footer-brand p { color: var(--c-muted); font-size: .88rem; }
.footer-links,.footer-contact { display: flex; flex-direction: column; gap: .5rem; }
.footer-links h4,.footer-contact h4 { font-size: .9rem; font-weight: 600; color: var(--c-muted); text-transform: uppercase; letter-spacing: .05em; margin-bottom: .25rem; }
.footer-links a,.footer-contact a,.footer-contact span { font-size: .88rem; color: var(--c-muted); transition: color .2s; }
.footer-links a:hover,.footer-contact a:hover { color: var(--c-text); }
.footer-contact-item { display: flex; align-items: center; gap: .4rem; flex-wrap: wrap; }
.footer-contact-item > span { font-size: .88rem; color: var(--c-muted); flex: 1; min-width: 0; word-break: break-all; }
.footer-copy-btn { flex-shrink: 0; padding: .15rem .55rem; border-radius: 4px; border: 1px solid var(--border); background: var(--bg-hover); color: var(--c-muted); font-size: .75rem; cursor: pointer; transition: border-color .2s, color .2s, background .2s; }
.footer-copy-btn:hover { border-color: var(--c-primary); color: var(--c-primary); }
.footer-open-btn { flex-shrink: 0; padding: .15rem .55rem; border-radius: 4px; border: 1px solid rgba(88,166,255,.35); background: rgba(88,166,255,.08); color: var(--c-primary); font-size: .75rem; transition: background .2s; }
.footer-open-btn:hover { background: rgba(88,166,255,.18); color: var(--c-primary); }
.footer-bottom { border-top: 1px solid var(--border); padding: 1.25rem 0; text-align: center; }
.footer-bottom p { font-size: .82rem; color: var(--c-subtle); }

/* Contact Modal Items */
.contact-type-svg { width: 32px; height: 32px; display: block; }
.footer-contact-item .contact-type-svg { width: 18px; height: 18px; }
.contact-bar-item .contact-type-svg { width: 18px; height: 18px; }
.contact-modal-item { display: flex; align-items: center; justify-content: space-between; gap: 1rem; background: var(--bg-hover); border: 1px solid var(--border); border-radius: 8px; padding: .85rem 1rem; }
.contact-modal-left { display: flex; align-items: center; gap: .75rem; min-width: 0; }
.contact-modal-icon { font-size: 1.5rem; flex-shrink: 0; line-height: 1; display: flex; align-items: center; }
.contact-modal-label { font-size: .82rem; color: var(--c-muted); margin-bottom: .15rem; }
.contact-modal-value { font-size: .95rem; font-weight: 600; color: var(--c-text); word-break: break-all; }
.contact-modal-btns { display: flex; gap: .4rem; flex-shrink: 0; }

/* Contact Bar (hero 下方横条) */
.contact-bar { background: linear-gradient(90deg,#0f1923 0%,#161B22 50%,#0f1923 100%); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); padding: .75rem 0; }
.contact-bar-inner { display: flex; align-items: center; flex-wrap: wrap; gap: .6rem 1.5rem; }
.contact-bar-label { font-size: .82rem; font-weight: 700; color: var(--c-primary); white-space: nowrap; flex-shrink: 0; }
.contact-bar-item { display: flex; align-items: center; gap: .35rem; font-size: .85rem; color: var(--c-muted); }
.contact-bar-item strong { color: var(--c-text); }
.contact-bar-copy { padding: .15rem .5rem; border-radius: 4px; border: 1px solid var(--border); background: var(--bg-hover); color: var(--c-muted); font-size: .75rem; cursor: pointer; transition: border-color .15s, color .15s; white-space: nowrap; }
.contact-bar-copy:hover { border-color: var(--c-primary); color: var(--c-primary); }
.contact-bar-open { padding: .15rem .5rem; border-radius: 4px; border: 1px solid rgba(88,166,255,.35); background: rgba(88,166,255,.1); color: var(--c-primary); font-size: .75rem; white-space: nowrap; transition: background .15s; }
.contact-bar-open:hover { background: rgba(88,166,255,.22); color: var(--c-primary); }
@media(max-width:640px){.contact-bar-inner{flex-direction:column;align-items:flex-start;gap:.5rem}.contact-bar-item{flex-wrap:wrap}}

/* Contact Section (homepage) */
.contact-section { background: var(--bg-deep); }
.contact-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 1.25rem; }
.contact-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.5rem 1.75rem; display: flex; flex-direction: column; gap: .85rem; transition: border-color .2s, transform .2s, box-shadow .2s; }
.contact-card:hover { border-color: var(--border-hi); transform: translateY(-3px); box-shadow: var(--shadow-glow); }
.contact-card-top { display: flex; align-items: center; gap: .75rem; }
.contact-card-icon { font-size: 1.6rem; line-height: 1; }
.contact-card-label { font-size: 1rem; font-weight: 600; }
.contact-card-value { font-size: .9rem; color: var(--c-muted); word-break: break-all; padding: .6rem .85rem; background: var(--bg-hover); border-radius: 6px; }
.contact-card-actions { display: flex; gap: .6rem; }
.contact-copy-btn { flex: 1; padding: .5rem; border-radius: 6px; border: 1px solid var(--border); background: transparent; color: var(--c-muted); font-size: .85rem; cursor: pointer; transition: border-color .2s, color .2s, background .2s; text-align: center; }
.contact-copy-btn:hover { border-color: var(--c-primary); color: var(--c-primary); background: rgba(88,166,255,.06); }
.contact-open-btn { flex: 1; padding: .5rem; border-radius: 6px; border: 1px solid rgba(88,166,255,.35); background: rgba(88,166,255,.08); color: var(--c-primary); font-size: .85rem; text-align: center; transition: background .2s; }
.contact-open-btn:hover { background: rgba(88,166,255,.18); color: var(--c-primary); }

@media(max-width:900px){.changelog-layout{grid-template-columns:1fr}.changelog-sidebar{position:static}.footer-inner{grid-template-columns:1fr 1fr}.tech-banner-inner{flex-direction:column;gap:1.5rem}.tech-divider{display:none}}
@media(max-width:640px){.nav-links{display:none;flex-direction:column;position:absolute;top:60px;left:0;right:0;background:var(--bg-card);border-bottom:1px solid var(--border);padding:1rem;gap:.25rem}.nav-links.open{display:flex}.nav-toggle{display:flex}.btn-nav-cta{display:none}.nav-inner{position:relative}.hero-stats{flex-direction:column;gap:1rem}.stat-divider{display:none}.steps-grid{flex-direction:column;align-items:center}.step-arrow{display:none}.footer-inner{grid-template-columns:1fr}.features-grid{grid-template-columns:1fr}.tutorials-grid{grid-template-columns:1fr}}