/* ========================================
   坤靖科技官网 - 科技感深色主题样式
   ======================================== */

/* CSS Variables */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #1a1a24;
    --color-primary: #00d4ff;
    --color-secondary: #a855f7;
    --color-accent: #22c55e;
    --color-text: #f0f0f5;
    --color-text-secondary: #9ca3af;
    --color-border: rgba(255, 255, 255, 0.1);
    --glow-primary: 0 0 20px rgba(0, 212, 255, 0.5);
    --glow-secondary: 0 0 20px rgba(168, 85, 247, 0.5);
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-main);
    background: var(--bg-primary);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ========================================
   粒子背景 Canvas
   ======================================== */
#particle-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* ========================================
   导航栏
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    padding: 12px 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Logo */
.logo {
    position: relative;
    display: flex;
    align-items: center;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: 4px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
    z-index: 1;
}

.logo-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 30px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    filter: blur(15px);
    opacity: 0.5;
    animation: logoPulse 2s ease-in-out infinite;
}

@keyframes logoPulse {
    0%, 100% { opacity: 0.3; transform: translate(-50%, -50%) scale(1); }
    50% { opacity: 0.6; transform: translate(-50%, -50%) scale(1.2); }
}

/* Nav Links */
.nav-links {
    display: flex;
    gap: 40px;
}

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: var(--transition);
    position: relative;
    padding: 8px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-text);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

/* Mobile Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: var(--transition);
}

/* ========================================
   Hero 区域
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px 24px 80px;
    overflow: hidden;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
}

.hero-badge {
    display: inline-block;
    padding: 8px 20px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 2px;
    color: var(--color-primary);
    border: 1px solid rgba(0, 212, 255, 0.3);
    border-radius: 30px;
    margin-bottom: 30px;
    background: rgba(0, 212, 255, 0.05);
    animation: badgePulse 2s ease-in-out infinite;
}

@keyframes badgePulse {
    0%, 100% { box-shadow: 0 0 20px rgba(0, 212, 255, 0.2); }
    50% { box-shadow: 0 0 30px rgba(0, 212, 255, 0.4); }
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 20px;
    min-height: 1.2em;
}

.typewriter {
    display: block;
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-primary) 50%, var(--color-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% 200%;
    animation: gradientShift 3s ease infinite;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--color-text-secondary);
    margin-bottom: 16px;
    letter-spacing: 1px;
}

.hero-description {
    font-size: 1rem;
    color: var(--color-text-secondary);
    opacity: 0.7;
    margin-bottom: 40px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--bg-primary);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--glow-primary);
}

.btn-outline {
    background: transparent;
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    box-shadow: inset 0 0 20px rgba(0, 212, 255, 0.1);
}

.btn-icon {
    width: 18px;
    height: 18px;
    transition: transform 0.3s ease;
}

.btn:hover .btn-icon {
    transform: translateX(4px);
}

/* Hero Decoration */
.hero-decoration {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 1;
    pointer-events: none;
}

.ring {
    position: absolute;
    border: 1px solid rgba(0, 212, 255, 0.1);
    border-radius: 50%;
    animation: ringRotate 20s linear infinite;
}

.ring-1 {
    width: 400px;
    height: 400px;
    top: -200px;
    left: -200px;
}

.ring-2 {
    width: 600px;
    height: 600px;
    top: -300px;
    left: -300px;
    animation-direction: reverse;
    animation-duration: 30s;
}

.ring-3 {
    width: 800px;
    height: 800px;
    top: -400px;
    left: -400px;
    animation-duration: 40s;
}

@keyframes ringRotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    color: var(--color-text-secondary);
    font-size: 0.8rem;
    animation: bounce 2s ease-in-out infinite;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid var(--color-primary);
    border-bottom: 2px solid var(--color-primary);
    transform: rotate(45deg);
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(10px); }
}

/* ========================================
   通用 Section 样式
   ======================================== */
section {
    position: relative;
    z-index: 2;
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header.left {
    text-align: left;
}

.section-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 3px;
    color: var(--color-primary);
    margin-bottom: 16px;
    opacity: 0.8;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    margin-bottom: 16px;
}

.section-desc {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   服务板块
   ======================================== */
.services {
    background: linear-gradient(180deg, transparent, var(--bg-secondary) 50%, transparent);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.service-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 40px;
    overflow: hidden;
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-8px);
    border-color: rgba(0, 212, 255, 0.3);
}

.service-card:hover .service-glow {
    opacity: 1;
}

.service-glow {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--color-primary), var(--color-secondary), transparent);
    opacity: 0;
    transition: var(--transition);
}

.service-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.1), rgba(168, 85, 247, 0.1));
    border-radius: 12px;
    margin-bottom: 24px;
}

.service-icon svg {
    width: 32px;
    height: 32px;
    stroke: var(--color-primary);
}

.service-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.service-desc {
    color: var(--color-text-secondary);
    margin-bottom: 20px;
    line-height: 1.7;
}

.service-features {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.service-features li {
    position: relative;
    padding-left: 20px;
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

.service-features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 6px;
    height: 6px;
    background: var(--color-primary);
    border-radius: 50%;
}

/* ========================================
   APP界面展示
   ======================================== */
.app-showcase {
    background:
        linear-gradient(180deg, transparent, rgba(18, 18, 26, 0.96) 18%, rgba(18, 18, 26, 0.96) 82%, transparent),
        radial-gradient(circle at 18% 28%, rgba(34, 197, 94, 0.14), transparent 30%),
        radial-gradient(circle at 86% 18%, rgba(0, 212, 255, 0.12), transparent 34%);
    overflow: hidden;
}

.showcase-layout {
    display: grid;
    grid-template-columns: minmax(260px, 0.72fr) minmax(0, 1.28fr);
    gap: 48px;
    align-items: center;
}

.showcase-copy {
    position: sticky;
    top: 110px;
    align-self: start;
}

.showcase-kicker {
    display: inline-block;
    margin-bottom: 16px;
    color: var(--color-accent);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 3px;
}

.showcase-copy h3 {
    font-size: clamp(1.7rem, 3vw, 2.5rem);
    line-height: 1.2;
    margin-bottom: 18px;
}

.showcase-copy p {
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 26px;
}

.showcase-points {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.showcase-points span {
    padding: 8px 14px;
    color: var(--color-text);
    font-size: 0.86rem;
    border: 1px solid rgba(34, 197, 94, 0.28);
    border-radius: 999px;
    background: rgba(34, 197, 94, 0.08);
}

.app-log-display {
    width: 96px;
    height: 96px;
    margin: 16px auto 20px;
    overflow: hidden;
    border-radius: 22px;
    border: 1px solid rgba(34, 197, 94, 0.22);
    background: #111;
    box-shadow: 0 18px 50px rgba(34, 197, 94, 0.14);
}

.app-log-display img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.phone-gallery {
    position: relative;
    overflow-x: auto;
    overflow-y: hidden;
    margin: 0 -24px;
    padding: 10px 24px 24px;
    cursor: grab;
    overscroll-behavior-x: contain;
    scroll-behavior: auto;
    -webkit-overflow-scrolling: touch;
    -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
    mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
}

.phone-gallery.is-dragging {
    cursor: grabbing;
    scroll-behavior: auto;
    user-select: none;
}

.phone-gallery {
    -ms-overflow-style: none;
    scrollbar-width: none;
}

.phone-gallery::-webkit-scrollbar {
    display: none;
}

.phone-track {
    display: flex;
    align-items: flex-start;
    width: max-content;
    width: -moz-max-content;
}

.phone-card {
    position: relative;
    flex: 0 0 220px;
    width: 220px;
    display: flex;
    flex-direction: column;
    min-height: 650px;
    margin-right: 22px;
    padding: 12px;
    border: 1px solid var(--color-border);
    border-radius: 22px;
    background: rgba(26, 26, 36, 0.78);
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.32);
    transition: var(--transition);
}

.phone-card:hover {
    transform: translateY(-8px);
    border-color: rgba(34, 197, 94, 0.42);
    box-shadow: 0 28px 90px rgba(0, 212, 255, 0.14);
}

.phone-card-featured {
    margin-top: 0;
}

.phone-card:nth-child(2),
.phone-card:nth-child(5),
.phone-card:nth-child(7),
.phone-card:nth-child(10) {
    margin-top: 0;
}

.phone-frame {
    position: relative;
    flex: 0 0 auto;
    overflow: hidden;
    aspect-ratio: 750 / 1626;
    border-radius: 16px;
    background: #050807;
}

.phone-frame::after {
    content: '';
    position: absolute;
    inset: 0;
    pointer-events: none;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: inherit;
    box-shadow: inset 0 0 26px rgba(255, 255, 255, 0.04);
}

.phone-frame img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    pointer-events: none;
    user-select: none;
    -webkit-user-drag: none;
}

.phone-caption {
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex: 1;
    padding: 14px 2px 2px;
}

.phone-caption strong {
    font-size: 1rem;
    color: var(--color-text);
}

.phone-caption span {
    color: var(--color-text-secondary);
    font-size: 0.84rem;
    line-height: 1.55;
}

@supports not (aspect-ratio: 1 / 1) {
    .phone-frame {
        height: 477px;
    }

    @media (max-width: 1024px) {
        .phone-frame {
            height: 445px;
        }
    }

    @media (max-width: 768px) {
        .phone-frame {
            height: 434px;
        }
    }

    @media (max-width: 480px) {
        .phone-frame {
            height: 407px;
        }
    }
}

@media (prefers-reduced-motion: reduce) {
    .phone-gallery {
        -webkit-mask-image: none;
        mask-image: none;
    }

}

/* ========================================
   成功案例
   ======================================== */
.cases {
    background: var(--bg-secondary);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.case-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 40px 30px;
    text-align: center;
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
}

.case-card:hover {
    transform: translateY(-5px) scale(1.02);
    border-color: var(--color-primary);
}

.case-card:hover .case-glow {
    opacity: 1;
}

.case-glow {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at center, rgba(0, 212, 255, 0.1), transparent 70%);
    opacity: 0;
    transition: var(--transition);
}

.case-logo {
    position: relative;
    z-index: 1;
    margin-bottom: 16px;
}

.case-name {
    display: block;
    font-size: 1.8rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 2px;
}

.case-fullname {
    display: block;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    margin-top: 4px;
}

.case-desc {
    position: relative;
    z-index: 1;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

/* ========================================
   关于我们
   ======================================== */
.about {
    background: linear-gradient(180deg, transparent, var(--bg-primary));
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-desc {
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 40px;
}

.about-features {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.feature-item {
    display: flex;
    gap: 16px;
}

.feature-icon {
    width: 48px;
    height: 48px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 212, 255, 0.1);
    border-radius: 10px;
}

.feature-icon svg {
    width: 24px;
    height: 24px;
    stroke: var(--color-primary);
}

.feature-text h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.feature-text p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

/* Stats */
.about-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.stat-item {
    text-align: center;
    padding: 30px;
    background: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    transition: var(--transition);
}

.stat-item:hover {
    border-color: var(--color-primary);
    transform: translateY(-3px);
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.stat-suffix {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
}

.stat-label {
    display: block;
    margin-top: 8px;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

/* ========================================
   联系方式
   ======================================== */
.contact {
    background: var(--bg-secondary);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-item {
    background: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 40px 30px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    transition: var(--transition);
}

.contact-item:hover {
    border-color: var(--color-primary);
    transform: translateY(-5px);
    box-shadow: 0 10px 40px rgba(0, 212, 255, 0.1);
}

.contact-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.15), rgba(168, 85, 247, 0.15));
    border-radius: 50%;
}

.contact-icon svg {
    width: 28px;
    height: 28px;
    stroke: var(--color-primary);
}

.contact-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-primary);
    letter-spacing: 1px;
    text-transform: uppercase;
}

.contact-info {
    font-size: 1rem;
    color: var(--color-text);
    line-height: 1.6;
}

.info-icon {
    width: 48px;
    height: 48px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 212, 255, 0.1);
    border-radius: 10px;
}

.info-icon svg {
    width: 22px;
    height: 22px;
    stroke: var(--color-primary);
}

.info-text {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.info-label {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.info-value {
    font-size: 1rem;
    font-weight: 500;
}

/* Social Links */
.social-links {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}

.social-link {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    color: var(--color-text-secondary);
    transition: var(--transition);
}

.social-link:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-3px);
}

.social-link svg {
    width: 20px;
    height: 20px;
}

/* ========================================
   页脚
   ======================================== */
.footer {
    position: relative;
    z-index: 2;
    padding: 40px 0;
    border-top: 1px solid var(--color-border);
    background: var(--bg-primary);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.footer-logo .logo-text {
    font-size: 1.2rem;
}

.footer-copy {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

.footer-record {
    font-size: 0.82rem;
    color: var(--color-text-secondary);
    transition: var(--transition);
}

.footer-record:hover {
    color: var(--color-primary);
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1024px) {
    .services-grid {
        grid-template-columns: 1fr;
    }

    .showcase-layout {
        grid-template-columns: 1fr;
        gap: 34px;
    }

    .showcase-copy {
        position: static;
        max-width: 760px;
    }

    .phone-gallery {
        margin: 0 -24px;
        padding: 8px 24px 22px;
        overflow: hidden;
    }

    .phone-card {
        flex-basis: 205px;
        width: 205px;
        min-height: 620px;
    }

    .phone-card-featured {
        margin-top: 0;
    }

    .phone-card:nth-child(2),
    .phone-card:nth-child(5),
    .phone-card:nth-child(7),
    .phone-card:nth-child(10) {
        margin-top: 0;
    }

    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .about-stats {
        order: -1;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    section {
        padding: 80px 0;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(10, 10, 15, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 30px;
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }

    .nav-links.active {
        opacity: 1;
        visibility: visible;
    }

    .nav-link {
        font-size: 1.2rem;
    }

    .phone-gallery {
        margin: 0 -24px;
        padding: 6px 24px 20px;
    }

    .phone-card {
        flex-basis: 200px;
        width: 200px;
        min-height: 610px;
        margin-right: 16px;
        border-radius: 18px;
        padding: 10px;
    }

    .phone-frame {
        border-radius: 13px;
    }

    .app-log-display {
        width: 86px;
        height: 86px;
        border-radius: 20px;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .case-card {
        padding: 30px 20px;
    }

    .case-name {
        font-size: 1.4rem;
    }

    .about-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .stat-number {
        font-size: 2.5rem;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .scroll-indicator {
        display: none;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 100px 16px 60px;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .showcase-points span {
        font-size: 0.8rem;
        padding: 7px 11px;
    }

    .phone-gallery {
        margin: 0 -16px;
        padding: 6px 16px 18px;
    }

    .phone-card {
        flex-basis: 188px;
        width: 188px;
        min-height: 590px;
    }

    .phone-caption span {
        font-size: 0.8rem;
    }

    .app-log-display {
        width: 78px;
        height: 78px;
        margin: 14px auto 18px;
        border-radius: 18px;
    }

    .cases-grid {
        grid-template-columns: 1fr;
    }

    .about-stats {
        grid-template-columns: 1fr;
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   动画 - 元素进入视图
   ======================================== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}