/* ============================================================
   配色变量  Primary: Sky Blue | Accent: Amber | Dark: Navy
   ============================================================ */
:root {
    --primary:        #0ea5e9;
    --primary-dark:   #0284c7;
    --primary-darker: #0369a1;
    --accent:         #f59e0b;
    --accent-dark:    #d97706;
    --success:        #10b981;
    --danger:         #ef4444;
    --dark:           #0f172a;
    --dark2:          #1e293b;
    --muted:          #64748b;
    --border:         #e2e8f0;
    --light:          #f8fafc;
    --white:          #ffffff;
    --gradient:       linear-gradient(135deg, #0369a1 0%, #0ea5e9 100%);
    --shadow-sm:      0 1px 3px rgba(0,0,0,.08);
    --shadow:         0 4px 16px rgba(14,165,233,.12);
    --shadow-lg:      0 12px 32px rgba(14,165,233,.18);
    --radius:         12px;
    --radius-lg:      20px;
}

/* ============================================================
   基础
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Microsoft YaHei", sans-serif;
    color: var(--dark2);
    background: var(--white);
    line-height: 1.7;
    overflow-x: hidden;
}

/* ============================================================
   滚动进度条
   ============================================================ */
#scrollProgress {
    position: fixed;
    top: 0; left: 0;
    height: 3px;
    width: 0%;
    background: linear-gradient(90deg, #0369a1, #0ea5e9, #38bdf8);
    z-index: 10000;
    transition: width .1s linear;
}

/* ============================================================
   Navbar
   ============================================================ */
#mainNav {
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255,255,255,.06);
    padding: 0;
    transition: background .35s, box-shadow .35s, padding .3s;
}
#mainNav .container { min-height: 60px; }
#mainNav.scrolled {
    background: rgba(15, 23, 42, .97);
    box-shadow: 0 4px 24px rgba(0,0,0,.3);
}

/* Brand */
#mainNav .navbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    padding: 0;
}
.nav-avatar {
    width: 32px; height: 32px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid rgba(14,165,233,.5);
    flex-shrink: 0;
}
.nav-avatar-icon {
    width: 32px; height: 32px;
    border-radius: 50%;
    background: rgba(14,165,233,.15);
    border: 2px solid rgba(14,165,233,.35);
    display: flex; align-items: center; justify-content: center;
    color: var(--primary);
    font-size: .85rem;
    flex-shrink: 0;
}
.nav-brand-name {
    font-size: 1.05rem;
    font-weight: 800;
    color: #fff;
    letter-spacing: -.3px;
}

/* Nav links */
#mainNav .nav-link {
    color: rgba(255,255,255,.62) !important;
    font-size: .87rem;
    font-weight: 500;
    padding: 6px 13px !important;
    border-radius: 6px;
    position: relative;
    transition: color .2s, background .2s;
}
#mainNav .nav-link::after {
    content: "";
    position: absolute;
    bottom: -1px; left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 16px; height: 2px;
    background: var(--primary);
    border-radius: 1px;
    transition: transform .25s ease;
}
#mainNav .nav-link:hover {
    color: #fff !important;
    background: rgba(255,255,255,.07);
}
#mainNav .nav-link.active {
    color: #fff !important;
    background: rgba(14,165,233,.12);
}
#mainNav .nav-link.active::after { transform: translateX(-50%) scaleX(1); }

/* Right controls */
.nav-controls {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: 12px;
    flex-shrink: 0;
}

/* CTA button in navbar */
.nav-cta-btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    background: var(--gradient);
    color: #fff !important;
    text-decoration: none;
    padding: 7px 18px;
    border-radius: 50px;
    font-size: .82rem;
    font-weight: 700;
    transition: transform .2s, box-shadow .2s, opacity .2s;
    box-shadow: 0 3px 12px rgba(14,165,233,.35);
    white-space: nowrap;
}
.nav-cta-btn:hover {
    color: #fff !important;
    transform: translateY(-1px);
    box-shadow: 0 5px 18px rgba(14,165,233,.5);
}

/* Mobile CTA inside collapse */
.nav-cta-mobile {
    display: block;
    text-align: center;
    background: var(--gradient);
    color: #fff;
    text-decoration: none;
    padding: 11px;
    border-radius: 10px;
    font-weight: 700;
    font-size: .92rem;
    margin: 12px 8px 8px;
    transition: opacity .2s;
}
.nav-cta-mobile:hover { color: #fff; opacity: .9; }

/* Custom hamburger */
.nav-hamburger {
    width: 36px; height: 36px;
    background: rgba(255,255,255,.07);
    border: 1px solid rgba(255,255,255,.12);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    cursor: pointer;
    padding: 0;
    transition: background .2s;
}
.nav-hamburger:hover { background: rgba(255,255,255,.14); }
.nav-hamburger .bar {
    display: block;
    width: 16px; height: 2px;
    background: rgba(255,255,255,.75);
    border-radius: 1px;
    transition: transform .3s, opacity .3s, width .3s;
    transform-origin: center;
}
.nav-hamburger.open .bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.open .bar:nth-child(2) { opacity: 0; width: 0; }
.nav-hamburger.open .bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile collapse panel */
@media (max-width: 991.98px) {
    #navbarNav {
        background: rgba(15,23,42,.97);
        border-top: 1px solid rgba(255,255,255,.06);
        border-radius: 0 0 14px 14px;
        padding: 8px 0;
        margin-top: 2px;
    }
    #navbarNav .nav-link {
        padding: 10px 20px !important;
        border-radius: 0;
        font-size: .92rem !important;
        border-left: 3px solid transparent;
    }
    #navbarNav .nav-link.active {
        background: rgba(14,165,233,.1) !important;
        border-left-color: var(--primary);
    }
    #navbarNav .nav-link::after { display: none; }
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
    min-height: 100vh;
    background: var(--dark);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
}
#heroCanvas {
    position: absolute;
    inset: 0;
    z-index: 0;
}
.hero-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    pointer-events: none;
}
.hero-glow-1 {
    width: 500px; height: 500px;
    background: radial-gradient(circle, rgba(14,165,233,.2) 0%, transparent 70%);
    top: -100px; right: -100px;
    animation: floatGlow 8s ease-in-out infinite;
}
.hero-glow-2 {
    width: 350px; height: 350px;
    background: radial-gradient(circle, rgba(2,132,199,.15) 0%, transparent 70%);
    bottom: 0; left: -80px;
    animation: floatGlow 10s ease-in-out infinite reverse;
}
@keyframes floatGlow {
    0%, 100% { transform: translateY(0); }
    50%       { transform: translateY(-30px); }
}

/* 头像旋转光圈 */
.avatar-ring-wrap {
    position: relative;
    width: 128px; height: 128px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
}
.avatar-ring {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    background: conic-gradient(from 0deg, #0ea5e9 0%, #38bdf8 30%, #7dd3fc 50%, #0369a1 80%, #0ea5e9 100%);
    animation: spinRing 3s linear infinite;
}
.avatar-ring::after {
    content: "";
    position: absolute;
    inset: 4px;
    border-radius: 50%;
    background: var(--dark);
}
@keyframes spinRing {
    to { transform: rotate(360deg); }
}
.avatar-ring-wrap:hover .avatar-ring { animation-duration: 0.8s; }

.avatar-img {
    position: relative;
    z-index: 1;
    width: 112px; height: 112px;
    object-fit: cover;
    border-radius: 50%;
    border: 2px solid rgba(14,165,233,.3);
}
.avatar-placeholder {
    position: relative;
    z-index: 1;
    width: 112px; height: 112px;
    background: rgba(14,165,233,.15);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Hero 文字 */
.hero h1 {
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 800;
    letter-spacing: -.5px;
    line-height: 1.2;
}
.hero-name {
    background: linear-gradient(135deg, #38bdf8, #7dd3fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero .lead {
    font-size: 1.05rem;
    color: rgba(255,255,255,.6);
    min-height: 1.7em;
}
.typed-cursor {
    display: inline-block;
    width: 2px;
    height: 1em;
    background: var(--primary);
    margin-left: 3px;
    vertical-align: text-bottom;
    animation: blink .8s step-end infinite;
}
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0} }

/* Hero 按钮 */
.btn-hero-primary {
    display: inline-flex;
    align-items: center;
    background: var(--gradient);
    color: #fff;
    text-decoration: none;
    padding: 12px 32px;
    border-radius: 50px;
    font-weight: 700;
    font-size: .95rem;
    transition: transform .2s, box-shadow .2s, opacity .2s;
    box-shadow: 0 4px 20px rgba(14,165,233,.4);
}
.btn-hero-primary:hover {
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(14,165,233,.5);
}
.btn-hero-outline {
    display: inline-flex;
    align-items: center;
    background: transparent;
    color: rgba(255,255,255,.85);
    text-decoration: none;
    padding: 12px 32px;
    border-radius: 50px;
    font-weight: 700;
    font-size: .95rem;
    border: 1.5px solid rgba(255,255,255,.3);
    transition: background .2s, border-color .2s, transform .2s;
}
.btn-hero-outline:hover {
    color: #fff;
    background: rgba(255,255,255,.08);
    border-color: rgba(255,255,255,.6);
    transform: translateY(-2px);
}

/* Hero 社交行 */
.hero-social {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
}
.hero-social-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(255,255,255,.07);
    border: 1px solid rgba(255,255,255,.12);
    color: rgba(255,255,255,.65);
    padding: 5px 14px;
    border-radius: 50px;
    font-size: .82rem;
    text-decoration: none;
    transition: background .2s, color .2s;
}
.hero-social-btn:hover {
    background: rgba(14,165,233,.2);
    border-color: rgba(14,165,233,.4);
    color: #fff;
}

/* 向下箭头 */
.scroll-down-btn {
    position: absolute;
    bottom: 36px; left: 50%;
    transform: translateX(-50%);
    color: rgba(255,255,255,.35);
    font-size: 1.3rem;
    animation: bounce 2s ease-in-out infinite;
    text-decoration: none;
    z-index: 2;
}
.scroll-down-btn:hover { color: var(--primary); }
@keyframes bounce {
    0%,100% { transform: translateX(-50%) translateY(0); }
    50%      { transform: translateX(-50%) translateY(8px); }
}

/* ============================================================
   Stats Bar
   ============================================================ */
.stats-bar {
    background: var(--white);
    border-bottom: 1px solid var(--border);
    padding: 40px 0;
}
.stat-card {
    background: var(--white);
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    padding: 24px 20px;
    text-align: center;
    transition: transform .25s, box-shadow .25s, border-color .25s;
}
.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
    border-color: rgba(14,165,233,.3);
}
.stat-icon-wrap {
    width: 48px; height: 48px;
    border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.2rem;
    margin: 0 auto 12px;
}
.stat-number {
    font-size: 2rem;
    font-weight: 800;
    color: var(--dark);
    line-height: 1;
    letter-spacing: -.5px;
}
.stat-unit { font-size: 1.1rem; font-weight: 700; color: var(--muted); }
.stat-label { color: var(--muted); font-size: .8rem; margin-top: 6px; font-weight: 500; }

/* ============================================================
   Section 标题
   ============================================================ */
.section-tag {
    display: inline-block;
    background: rgba(14,165,233,.1);
    color: var(--primary-darker);
    font-size: .72rem;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    padding: 4px 14px;
    border-radius: 50px;
    margin-bottom: 10px;
}
.section-title {
    font-size: clamp(1.6rem, 3vw, 2.2rem);
    font-weight: 800;
    color: var(--dark);
    letter-spacing: -.3px;
}
.section-line {
    width: 48px; height: 4px;
    background: var(--gradient);
    border-radius: 2px;
    margin: 12px auto 0;
}

/* ============================================================
   Status Badge (Hero)
   ============================================================ */
.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(16,185,129,.12);
    border: 1px solid rgba(16,185,129,.25);
    color: #34d399;
    padding: 6px 18px;
    border-radius: 50px;
    font-size: .82rem;
    font-weight: 600;
    letter-spacing: .3px;
}
.status-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: #34d399;
    box-shadow: 0 0 0 3px rgba(52,211,153,.3);
    animation: pulse-dot 2s ease-in-out infinite;
    flex-shrink: 0;
}
@keyframes pulse-dot {
    0%,100% { box-shadow: 0 0 0 3px rgba(52,211,153,.3); }
    50%      { box-shadow: 0 0 0 6px rgba(52,211,153,.1); }
}
.hero-bio {
    color: rgba(255,255,255,.55);
    font-size: .95rem;
    max-width: 480px;
    margin: 0 auto;
}

/* ============================================================
   Services Section
   ============================================================ */
.services-section {
    padding: 90px 0;
    background: var(--light);
}
.service-card {
    background: var(--white);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px 24px 28px;
    height: 100%;
    position: relative;
    overflow: hidden;
    transition: transform .28s cubic-bezier(.34,1.56,.64,1), box-shadow .28s, border-color .28s;
}
.service-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(14,165,233,.35);
}
.service-card:hover .service-icon-wrap i {
    transform: scale(1.15) rotate(-8deg);
}
.service-icon-wrap {
    width: 56px; height: 56px;
    border-radius: 16px;
    background: rgba(14,165,233,.1);
    color: var(--svc-color, var(--primary));
    display: flex; align-items: center; justify-content: center;
    font-size: 1.4rem;
    margin-bottom: 18px;
    transition: background .25s;
}
.service-card:hover .service-icon-wrap {
    background: color-mix(in srgb, var(--svc-color, var(--primary)) 15%, transparent);
}
.service-icon-wrap i { transition: transform .3s; }
.service-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 10px;
}
.service-desc {
    font-size: .87rem;
    color: var(--muted);
    line-height: 1.65;
    margin-bottom: 20px;
}
.service-line {
    height: 3px;
    width: 36px;
    border-radius: 2px;
    transition: width .3s;
}
.service-card:hover .service-line { width: 56px; }

/* ============================================================
   Projects Section
   ============================================================ */
.projects-section { padding: 90px 0; background: var(--white); }

/* ============================================================
   Skills (keep styles in case referenced elsewhere)
   ============================================================ */
.skill-card {
    background: var(--white);
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 16px;
    text-align: center;
    transition: transform .28s cubic-bezier(.34,1.56,.64,1), box-shadow .28s, border-color .28s;
    cursor: default;
}
.skill-card:hover {
    transform: translateY(-5px) scale(1.03);
    box-shadow: var(--shadow-lg);
    border-color: rgba(14,165,233,.35);
}
.skill-icon {
    font-size: 2.2rem;
    margin-bottom: 10px;
    display: block;
    transition: transform .3s;
}
.skill-card:hover .skill-icon { transform: scale(1.2) rotate(-5deg); }
.skill-name { font-size: .85rem; font-weight: 700; color: var(--dark2); margin-bottom: 8px; }
.skill-bar-bg {
    height: 5px;
    background: var(--light);
    border-radius: 50px;
    overflow: hidden;
    margin-bottom: 4px;
}
.skill-bar-fill {
    height: 100%;
    border-radius: 50px;
    width: 0;
    background: var(--skill-color, var(--primary));
    transition: width 1.3s cubic-bezier(.4,0,.2,1);
}
.skill-level { font-size: .72rem; color: var(--muted); font-weight: 600; }

/* ============================================================
   Project Color Bar
   ============================================================ */
.project-color-bar {
    height: 4px;
    background: var(--gradient);
    width: 0;
    transition: width .4s ease;
}
.project-card:hover .project-color-bar { width: 100%; }

/* ============================================================
   Empty state
   ============================================================ */
.empty-state { color: #cbd5e1; }
.empty-state i { opacity: .5; }

/* ============================================================
   CTA Section
   ============================================================ */
.cta-section {
    padding: 0 0 80px;
    background: var(--white);
}
.cta-inner {
    background: linear-gradient(135deg, #0f172a 0%, #0369a1 50%, #0ea5e9 100%);
    border-radius: var(--radius-lg);
    padding: 48px 52px;
    position: relative;
    overflow: hidden;
}
.cta-inner::before {
    content: "";
    position: absolute;
    top: -80px; right: -80px;
    width: 280px; height: 280px;
    background: radial-gradient(circle, rgba(255,255,255,.07) 0%, transparent 65%);
    border-radius: 50%;
    pointer-events: none;
}
.cta-title {
    font-size: clamp(1.4rem, 3vw, 2rem);
    font-weight: 800;
    color: #fff;
    margin: 8px 0 6px;
    letter-spacing: -.3px;
}
.cta-desc {
    color: rgba(255,255,255,.6);
    font-size: .9rem;
    margin: 0;
}
.btn-cta {
    display: inline-flex;
    align-items: center;
    background: var(--white);
    color: var(--primary-darker);
    text-decoration: none;
    padding: 14px 32px;
    border-radius: 50px;
    font-weight: 700;
    font-size: .95rem;
    transition: transform .2s, box-shadow .2s;
    box-shadow: 0 4px 20px rgba(0,0,0,.2);
}
.btn-cta:hover {
    color: var(--primary-darker);
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(0,0,0,.25);
}

/* ============================================================
   Filter Buttons
   ============================================================ */
.filter-btn {
    border: 1.5px solid var(--border);
    background: var(--white);
    color: var(--muted);
    border-radius: 50px;
    padding: 6px 20px;
    font-size: .85rem;
    font-weight: 600;
    transition: all .2s;
    cursor: pointer;
}
.filter-btn:hover, .filter-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--white);
    box-shadow: 0 4px 12px rgba(14,165,233,.35);
}

/* ============================================================
   Project Card
   ============================================================ */
.project-card {
    border: 1.5px solid var(--border);
    border-radius: var(--radius-lg);
    background: var(--white);
    transition: transform .28s cubic-bezier(.34,1.56,.64,1),
                box-shadow .28s, border-color .28s;
    overflow: hidden;
    transform-style: preserve-3d;
    will-change: transform;
}
.project-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: rgba(14,165,233,.4);
}

/* 图片悬停覆盖层 */
.project-img-wrap {
    overflow: hidden;
    height: 200px;
    position: relative;
    background: var(--light);
}
.project-img {
    width: 100%; height: 100%;
    object-fit: cover;
    transition: transform .5s ease;
    display: block;
}
.project-card:hover .project-img { transform: scale(1.06); }

.project-img-placeholder {
    width: 100%; height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--light);
    color: #cbd5e1;
}

.project-overlay {
    position: absolute;
    inset: 0;
    background: rgba(3,105,161,.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity .3s;
}
.project-card:hover .project-overlay { opacity: 1; }
.overlay-btn {
    background: #fff;
    color: var(--primary-darker);
    border-radius: 50px;
    padding: 9px 22px;
    font-weight: 700;
    font-size: .88rem;
    text-decoration: none;
    transform: translateY(10px);
    transition: transform .3s;
}
.project-card:hover .overlay-btn { transform: translateY(0); }

.project-category-badge {
    font-size: .72rem;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 50px;
    background: rgba(14,165,233,.1);
    color: var(--primary-darker);
    border: 1px solid rgba(14,165,233,.2);
    display: inline-block;
}
.project-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--dark);
    margin: 8px 0 6px;
}
.tech-tag {
    display: inline-block;
    background: var(--light);
    color: var(--muted);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: .7rem;
    padding: 2px 7px;
    margin: 2px 2px 2px 0;
    font-weight: 500;
}
.price-tag {
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--accent-dark);
    letter-spacing: -.3px;
}
.btn-detail {
    background: var(--gradient);
    color: var(--white);
    border: none;
    border-radius: 8px;
    padding: 7px 18px;
    font-size: .85rem;
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: opacity .2s, transform .2s, box-shadow .2s;
}
.btn-detail:hover {
    color: #fff;
    opacity: .9;
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(14,165,233,.4);
}
.view-count { font-size: .75rem; color: #94a3b8; }

/* ============================================================
   Contact Section
   ============================================================ */
.contact-section { padding: 90px 0; background: var(--light); }

.contact-info-card {
    background: var(--white);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
}
.contact-info-title {
    font-size: .92rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 20px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--border);
}
.qr-block {
    margin-bottom: 20px;
}
.qr-label {
    font-size: .78rem;
    font-weight: 600;
    color: var(--muted);
    margin-bottom: 8px;
}
.qr-img {
    width: 130px;
    border-radius: 10px;
    border: 2.5px solid var(--border);
    display: block;
    transition: transform .25s, box-shadow .25s;
}
.contact-info-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}
.contact-info-icon {
    width: 40px; height: 40px;
    border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1rem;
    flex-shrink: 0;
}
.contact-info-sub { font-size: .72rem; color: var(--muted); font-weight: 500; }
.contact-info-val { font-size: .9rem; font-weight: 700; color: var(--dark); }

.promise-list { border-top: 1px solid var(--border); padding-top: 16px; }
.promise-item {
    display: flex; align-items: center; gap: 8px;
    font-size: .82rem;
    color: var(--muted);
    padding: 5px 0;
}
.promise-icon { color: var(--success); flex-shrink: 0; }

.platform-btn {
    border-radius: 8px;
    font-size: .85rem;
    font-weight: 600;
    padding: 9px 16px;
    transition: transform .2s, box-shadow .2s;
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: 1.5px solid #ef4444;
    color: #ef4444;
    border-radius: 8px;
}
.platform-btn:hover {
    background: #ef4444;
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(239,68,68,.25);
}

.inquiry-card {
    background: var(--white);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}
.inquiry-card .card-header-custom {
    background: var(--gradient);
    padding: 20px 28px;
    color: var(--white);
}
.inquiry-card .card-body { padding: 28px; }

.form-control, .form-select {
    border: 1.5px solid var(--border);
    border-radius: 8px;
    padding: 10px 14px;
    font-size: .9rem;
    transition: border-color .2s, box-shadow .2s;
}
.form-control:focus, .form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(14,165,233,.15);
    outline: none;
}
.form-label { font-size: .85rem; font-weight: 600; color: var(--dark2); margin-bottom: 6px; }

.btn-submit {
    background: var(--gradient);
    border: none;
    color: var(--white);
    border-radius: 8px;
    padding: 11px 28px;
    font-weight: 700;
    font-size: .95rem;
    width: 100%;
    transition: opacity .2s, transform .2s, box-shadow .2s;
    cursor: pointer;
}
.btn-submit:hover {
    opacity: .9;
    transform: translateY(-1px);
    box-shadow: 0 8px 20px rgba(14,165,233,.35);
}
.btn-submit:disabled { opacity: .65; transform: none; }

/* ============================================================
   Project Detail
   ============================================================ */
.detail-price-box {
    background: var(--gradient);
    border-radius: var(--radius);
    padding: 20px;
    color: var(--white);
    text-align: center;
}
.detail-price { font-size: 2.4rem; font-weight: 900; letter-spacing: -.5px; }
.feature-item {
    display: flex; align-items: flex-start; gap: 10px;
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
    font-size: .9rem;
}
.feature-item:last-child { border-bottom: none; }
.feature-icon { color: var(--success); margin-top: 2px; flex-shrink: 0; }
.include-item {
    display: flex; align-items: center; gap: 10px;
    padding: 7px 0;
    font-size: .88rem;
    color: var(--dark2);
}
.include-icon { color: var(--primary); font-size: .85rem; }

/* ============================================================
   QR Zoomable
   ============================================================ */
.qr-zoomable { cursor: zoom-in; }

/* ============================================================
   Footer
   ============================================================ */
.footer {
    background: var(--dark);
    padding: 48px 0 28px;
    border-top: 1px solid rgba(255,255,255,.05);
}
.footer-brand {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--white);
    letter-spacing: -.2px;
    margin-bottom: 8px;
}
.footer-brand i { color: var(--primary); }
.footer-desc {
    color: rgba(255,255,255,.35);
    font-size: .82rem;
    max-width: 260px;
    line-height: 1.65;
}
.footer-links { list-style: none; padding: 0; margin: 0; }
.footer-links li { margin-bottom: 8px; }
.footer-links a {
    color: rgba(255,255,255,.45);
    font-size: .83rem;
    text-decoration: none;
    transition: color .2s;
}
.footer-links a:hover { color: var(--primary); }
.footer-section-label {
    color: rgba(255,255,255,.6);
    font-size: .75rem;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    margin-bottom: 14px;
}
.footer-bottom {
    margin-top: 36px;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,.06);
}
.footer-bottom p { color: rgba(255,255,255,.3); font-size: .8rem; margin: 0; }

/* ============================================================
   FAQ Section
   ============================================================ */
.faq-section {
    padding: 90px 0;
    background: var(--white);
}
.faq-accordion { display: flex; flex-direction: column; gap: 12px; }
.faq-item {
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: border-color .25s, box-shadow .25s;
}
.faq-item:has(.faq-question[aria-expanded="true"]),
.faq-item:has(.collapse.show) {
    border-color: rgba(14,165,233,.4);
    box-shadow: 0 4px 16px rgba(14,165,233,.08);
}
.faq-question {
    width: 100%;
    background: var(--white);
    border: none;
    padding: 18px 22px;
    text-align: left;
    font-size: .92rem;
    font-weight: 700;
    color: var(--dark);
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    transition: background .2s, color .2s;
}
.faq-question:hover { background: var(--light); }
.faq-question:not(.collapsed) { color: var(--primary); background: rgba(14,165,233,.04); }
.faq-arrow {
    font-size: .55rem;
    color: var(--primary);
    transition: transform .3s;
    flex-shrink: 0;
    margin-top: 1px;
}
.faq-question:not(.collapsed) .faq-arrow { transform: rotate(90deg); }
.faq-answer {
    padding: 4px 22px 20px 46px;
    font-size: .88rem;
    color: var(--muted);
    line-height: 1.75;
    background: var(--white);
}

/* ============================================================
   Floating Contact Button
   ============================================================ */
.float-contact {
    position: fixed;
    bottom: 88px;
    right: 24px;
    z-index: 1100;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 10px;
}
.float-contact-main {
    width: 52px; height: 52px;
    border-radius: 50%;
    background: var(--gradient);
    border: none;
    color: #fff;
    font-size: 1.15rem;
    cursor: pointer;
    box-shadow: 0 4px 18px rgba(14,165,233,.45);
    display: flex; align-items: center; justify-content: center;
    transition: transform .25s, box-shadow .25s;
    position: relative;
    z-index: 1;
}
.float-contact-main:hover {
    transform: scale(1.08);
    box-shadow: 0 6px 24px rgba(14,165,233,.55);
}
.float-icon-close { display: none; }
.float-contact.open .float-icon-main  { display: none; }
.float-contact.open .float-icon-close { display: block; }

.float-contact-menu {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 10px;
    opacity: 0;
    transform: translateY(16px) scale(.95);
    pointer-events: none;
    transition: opacity .25s, transform .25s;
}
.float-contact.open .float-contact-menu {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}
.float-item-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
}
.float-item-label {
    background: var(--dark);
    color: rgba(255,255,255,.85);
    font-size: .75rem;
    font-weight: 600;
    padding: 5px 12px;
    border-radius: 20px;
    white-space: nowrap;
    box-shadow: 0 2px 8px rgba(0,0,0,.2);
}
.float-item-btn {
    width: 42px; height: 42px;
    border-radius: 50%;
    border: none;
    color: #fff;
    font-size: .95rem;
    cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    text-decoration: none;
    box-shadow: 0 3px 12px rgba(0,0,0,.2);
    transition: transform .2s, box-shadow .2s;
    flex-shrink: 0;
}
.float-item-btn:hover {
    color: #fff;
    transform: scale(1.1);
    box-shadow: 0 5px 16px rgba(0,0,0,.25);
}

/* ============================================================
   Back to Top
   ============================================================ */
#backToTop {
    position: fixed;
    bottom: 32px; right: 28px;
    width: 44px; height: 44px;
    background: var(--gradient);
    color: #fff;
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    transform: translateY(14px);
    transition: opacity .3s, transform .3s, box-shadow .2s;
    z-index: 1000;
    box-shadow: 0 4px 14px rgba(14,165,233,.4);
    font-size: .9rem;
}
#backToTop.visible { opacity: 1; transform: translateY(0); }
#backToTop:hover {
    box-shadow: 0 6px 22px rgba(14,165,233,.6);
    transform: translateY(-2px);
}

/* ============================================================
   Page Loader
   ============================================================ */
#pageLoader {
    position: fixed;
    inset: 0;
    background: var(--dark);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity .5s, visibility .5s;
}
#pageLoader.hidden { opacity: 0; visibility: hidden; }
.loader-ring {
    width: 48px; height: 48px;
    border: 4px solid rgba(14,165,233,.2);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ============================================================
   Notice Bar (顶部公告条)
   ============================================================ */
.notice-bar {
    background: linear-gradient(90deg, #0369a1, #0ea5e9);
    color: #fff;
    text-align: center;
    padding: 9px 48px 9px 16px;
    font-size: .83rem;
    font-weight: 600;
    position: relative;
    z-index: 1060;
}
.notice-icon { color: rgba(255,255,255,.8); font-size: .8rem; }
.notice-text { color: #fff; text-decoration: none; }
.notice-text:hover { color: rgba(255,255,255,.85); text-decoration: underline; }
.notice-close {
    position: absolute;
    right: 14px; top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: rgba(255,255,255,.7);
    cursor: pointer;
    font-size: .85rem;
    padding: 4px 6px;
    transition: color .2s;
}
.notice-close:hover { color: #fff; }

/* ============================================================
   Theme Toggle Button
   ============================================================ */
.theme-toggle {
    width: 34px; height: 34px;
    border-radius: 50%;
    background: rgba(255,255,255,.08);
    border: 1px solid rgba(255,255,255,.15);
    color: rgba(255,255,255,.7);
    display: flex; align-items: center; justify-content: center;
    cursor: pointer;
    font-size: .85rem;
    transition: background .2s, color .2s, transform .2s;
    flex-shrink: 0;
}
.theme-toggle:hover {
    background: rgba(255,255,255,.15);
    color: #fff;
    transform: rotate(20deg);
}

/* ============================================================
   Project Toolbar (搜索 + 分类)
   ============================================================ */
.projects-toolbar {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    margin-bottom: 40px;
}
.project-search-wrap {
    position: relative;
    width: 100%;
    max-width: 420px;
}
.project-search-icon {
    position: absolute;
    left: 14px; top: 50%;
    transform: translateY(-50%);
    color: var(--muted);
    font-size: .85rem;
    pointer-events: none;
}
.project-search-input {
    width: 100%;
    border: 1.5px solid var(--border);
    border-radius: 50px;
    padding: 9px 16px 9px 38px;
    font-size: .88rem;
    background: var(--white);
    color: var(--dark2);
    outline: none;
    transition: border-color .2s, box-shadow .2s;
}
.project-search-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(14,165,233,.12);
}
.filter-group { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; }

/* ============================================================
   Project Detail Page
   ============================================================ */
.detail-hero {
    position: relative;
    min-height: 340px;
    display: flex;
    align-items: flex-end;
    padding-bottom: 48px;
    overflow: hidden;
    margin-top: 0;
}
.detail-hero-bg {
    position: absolute;
    inset: 0;
}
.detail-hero-cover {
    width: 100%; height: 100%;
    object-fit: cover;
    filter: blur(4px) brightness(.45);
}
.detail-hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, rgba(15,23,42,.5) 0%, rgba(15,23,42,.9) 100%);
}
.detail-hero:not(:has(.detail-hero-cover)) {
    background: var(--dark);
}
.detail-hero-content {
    position: relative;
    z-index: 2;
    padding-top: 100px;
}
.breadcrumb-detail { background: transparent; padding: 0; margin: 0; }
.breadcrumb-detail .breadcrumb-item,
.breadcrumb-detail .breadcrumb-item a,
.breadcrumb-detail .breadcrumb-item.active { color: rgba(255,255,255,.55); font-size: .8rem; }
.breadcrumb-detail .breadcrumb-item a:hover { color: var(--primary); }
.breadcrumb-detail .breadcrumb-item + .breadcrumb-item::before { color: rgba(255,255,255,.3); }
.detail-category-badge {
    background: rgba(14,165,233,.2);
    border: 1px solid rgba(14,165,233,.4);
    color: #7dd3fc;
    font-size: .72rem; font-weight: 700;
    padding: 3px 12px; border-radius: 50px;
}
.detail-view-badge { color: rgba(255,255,255,.5); font-size: .8rem; }
.detail-hero-title {
    font-size: clamp(1.6rem, 4vw, 2.4rem);
    font-weight: 800;
    color: #fff;
    letter-spacing: -.4px;
    margin: 0 0 10px;
}
.detail-hero-desc { color: rgba(255,255,255,.6); font-size: .95rem; margin: 0; max-width: 600px; }
.detail-tech-badge {
    background: rgba(255,255,255,.1);
    border: 1px solid rgba(255,255,255,.18);
    color: rgba(255,255,255,.75);
    font-size: .72rem; font-weight: 600;
    padding: 3px 10px; border-radius: 4px;
}

.detail-body { padding-top: 48px; padding-bottom: 80px; }

.detail-screenshot-wrap {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    position: relative;
}
.detail-screenshot {
    width: 100%; display: block;
    max-height: 460px; object-fit: cover;
}
.detail-screenshot-label {
    position: absolute;
    bottom: 12px; right: 14px;
    background: rgba(0,0,0,.5);
    color: rgba(255,255,255,.75);
    font-size: .72rem;
    padding: 4px 10px;
    border-radius: 20px;
    backdrop-filter: blur(4px);
}

.detail-section { margin-bottom: 40px; }
.detail-section-header {
    display: flex; align-items: center; gap: 10px;
    margin-bottom: 16px;
}
.detail-section-dot {
    width: 10px; height: 10px;
    border-radius: 50%;
    background: var(--primary);
    flex-shrink: 0;
}
.detail-section-title {
    font-size: 1rem; font-weight: 700;
    color: var(--dark); margin: 0;
}
.detail-desc-text {
    color: var(--muted);
    line-height: 1.8;
    font-size: .93rem;
}
.detail-features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 10px;
}
.detail-feature-item {
    display: flex; align-items: flex-start; gap: 10px;
    padding: 10px 14px;
    background: var(--light);
    border-radius: 8px;
    font-size: .87rem;
    color: var(--dark2);
    border: 1px solid var(--border);
}
.detail-feature-icon { color: var(--success); font-size: .9rem; margin-top: 1px; flex-shrink: 0; }
.detail-tech-tag {
    display: inline-flex; align-items: center;
    background: var(--white);
    border: 1.5px solid var(--border);
    color: var(--dark2);
    border-radius: 6px;
    font-size: .83rem; font-weight: 600;
    padding: 5px 14px;
}

/* Sidebar */
.sidebar-price-card {
    background: linear-gradient(135deg, #0f172a 0%, #0369a1 100%);
    border-radius: var(--radius-lg);
    padding: 28px;
    color: #fff;
    text-align: center;
}
.sidebar-price-label { font-size: .75rem; font-weight: 600; opacity: .6; letter-spacing: 1px; text-transform: uppercase; }
.sidebar-price-val { font-size: 2.4rem; font-weight: 900; letter-spacing: -.5px; margin: 6px 0; }
.sidebar-price-sub { font-size: .8rem; opacity: .55; }
.sidebar-cta-btn {
    background: #fff;
    color: var(--primary-darker);
    border-radius: 10px;
    padding: 12px;
    font-weight: 700;
    font-size: .93rem;
    text-decoration: none;
    transition: transform .2s, box-shadow .2s;
    box-shadow: 0 4px 12px rgba(0,0,0,.2);
}
.sidebar-cta-btn:hover {
    color: var(--primary-darker);
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(0,0,0,.25);
}

.sidebar-card {
    background: var(--white);
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
}
.sidebar-card-title {
    font-size: .82rem;
    font-weight: 700;
    color: var(--muted);
    letter-spacing: .5px;
    text-transform: uppercase;
    margin-bottom: 14px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border);
}
.sidebar-include-list { display: flex; flex-direction: column; gap: 10px; }
.sidebar-include-item {
    display: flex; align-items: center; gap: 10px;
    font-size: .87rem; color: var(--dark2);
}
.sidebar-promise-list { display: flex; flex-direction: column; gap: 8px; }
.sidebar-promise-item {
    font-size: .83rem;
    color: var(--muted);
    display: flex; align-items: center; gap: 8px;
}
.sidebar-promise-item i { color: var(--success); font-size: .75rem; }

.qr-side-btn {
    width: 100%;
    background: color-mix(in srgb, var(--qr-color, var(--primary)) 10%, transparent);
    border: 1.5px solid color-mix(in srgb, var(--qr-color, var(--primary)) 30%, transparent);
    color: var(--qr-color, var(--primary));
    border-radius: 8px;
    padding: 10px 8px;
    cursor: pointer;
    display: flex; flex-direction: column; align-items: center; gap: 4px;
    font-size: .8rem; font-weight: 700;
    transition: background .2s, transform .15s;
}
.qr-side-btn i { font-size: 1.1rem; }
.qr-side-btn:hover {
    background: color-mix(in srgb, var(--qr-color, var(--primary)) 18%, transparent);
    transform: translateY(-2px);
}

/* ============================================================
   Dark Mode
   ============================================================ */
[data-theme="dark"] {
    --white:  #0f172a;
    --light:  #1e293b;
    --border: #334155;
    --dark:   #f1f5f9;
    --dark2:  #e2e8f0;
    --muted:  #94a3b8;
    --shadow-sm: 0 1px 3px rgba(0,0,0,.3);
    --shadow:    0 4px 16px rgba(0,0,0,.35);
    --shadow-lg: 0 12px 32px rgba(0,0,0,.45);
}
[data-theme="dark"] body { background: #0f172a; color: #e2e8f0; }
[data-theme="dark"] .stats-bar { background: #1e293b; border-color: #334155; }
[data-theme="dark"] .stat-card { background: #1e293b; }
[data-theme="dark"] .services-section { background: #0f172a; }
[data-theme="dark"] .service-card { background: #1e293b; border-color: #334155; }
[data-theme="dark"] .projects-section { background: #0f172a; }
[data-theme="dark"] .project-card { background: #1e293b; border-color: #334155; }
[data-theme="dark"] .project-img-placeholder { background: #334155; }
[data-theme="dark"] .faq-section { background: #0f172a; }
[data-theme="dark"] .faq-item { border-color: #334155; }
[data-theme="dark"] .faq-question { background: #1e293b; color: #e2e8f0; }
[data-theme="dark"] .faq-question:hover { background: #263548; }
[data-theme="dark"] .faq-question:not(.collapsed) { background: rgba(14,165,233,.07); }
[data-theme="dark"] .faq-answer { background: #1e293b; }
[data-theme="dark"] .contact-section { background: #0f172a; }
[data-theme="dark"] .contact-info-card,
[data-theme="dark"] .inquiry-card,
[data-theme="dark"] .sidebar-card { background: #1e293b; border-color: #334155; }
[data-theme="dark"] .project-search-input { background: #1e293b; color: #e2e8f0; border-color: #334155; }
[data-theme="dark"] .form-control,
[data-theme="dark"] .form-select { background: #1e293b; color: #e2e8f0; border-color: #334155; }
[data-theme="dark"] .form-control::placeholder { color: #64748b; }
[data-theme="dark"] .tech-tag { background: #263548; border-color: #334155; color: #94a3b8; }
[data-theme="dark"] .detail-tech-tag { background: #1e293b; border-color: #334155; color: #e2e8f0; }
[data-theme="dark"] .detail-feature-item { background: #263548; border-color: #334155; }
[data-theme="dark"] .qr-popup-inner { background: #1e293b; border-color: #334155; }
[data-theme="dark"] .qr-popup-inner::before { border-top-color: #1e293b; }
[data-theme="dark"] .cta-section { background: #0f172a; }
[data-theme="dark"] .filter-btn { background: #1e293b; border-color: #334155; color: #94a3b8; }
[data-theme="dark"] .float-item-label { background: #f1f5f9; color: #0f172a; }
[data-theme="dark"] #backToTop { box-shadow: 0 4px 14px rgba(0,0,0,.5); }

/* ============================================================
   Buttons Override
   ============================================================ */
.btn-primary { background: var(--gradient); border: none; font-weight: 600; }
.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-darker) 0%, var(--primary-dark) 100%);
    border: none;
    box-shadow: 0 6px 16px rgba(14,165,233,.35);
}
.btn-outline-primary { border-color: var(--primary); color: var(--primary); font-weight: 600; }
.btn-outline-primary:hover { background: var(--primary); border-color: var(--primary); }

/* ============================================================
   Scroll margin
   ============================================================ */
[id] { scroll-margin-top: 80px; }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 768px) {
    .hero h1 { font-size: 1.9rem; }
    .stat-divider { display: none; }
    .stat-item { padding: 8px 12px; }
    #backToTop { bottom: 20px; right: 16px; }
}