/*============================================================
   智宇软件 - 主样式表
   设计风格：深蓝企业风 + 金色点缀 + 现代简约
   PHP 8.2 + 响应式设计
  ============================================================*/

/* ----- CSS 变量 ----- */
:root {
    /* 主色调 */
    --color-primary: #1e3a5f;
    --color-primary-light: #2a5088;
    --color-primary-dark: #0f2440;
    --color-accent: #c8a45c;
    --color-accent-light: #dfc690;
    --color-accent-dark: #a07830;

    /* 中性色 */
    --color-white: #ffffff;
    --color-gray-50: #f8fafc;
    --color-gray-100: #f1f5f9;
    --color-gray-200: #e2e8f0;
    --color-gray-300: #cbd5e1;
    --color-gray-400: #94a3b8;
    --color-gray-500: #64748b;
    --color-gray-600: #475569;
    --color-gray-700: #334155;
    --color-gray-800: #1e293b;
    --color-gray-900: #0f172a;
    --color-gray-950: #020617;

    /* 渐变色 */
    --gradient-primary: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    --gradient-accent: linear-gradient(135deg, var(--color-accent-dark), var(--color-accent), var(--color-accent-light));
    --gradient-dark: linear-gradient(180deg, var(--color-gray-950), var(--color-gray-900));
    --gradient-hero: linear-gradient(135deg, #0a1628 0%, #0f2440 40%, #1a3a5c 70%, #0f2440 100%);

    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-glow: 0 0 40px rgba(37, 99, 235, 0.15);

    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* 间距 */
    --section-padding: 120px 0;
    --section-padding-mobile: 80px 0;

    /* 字体 */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SF Mono", "Fira Code", "Cascadia Code", Consolas, monospace;

    /* 过渡 */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* 容器 */
    --container-max: 1200px;
    --container-padding: 24px;
}

/* ----- 基础重置 ----- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-gray-700);
    background-color: var(--color-white);
    overflow-x: hidden;
}

::selection {
    background-color: var(--color-primary-light);
    color: var(--color-white);
}

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

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

ul {
    list-style: none;
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ----- 按钮样式 ----- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 600;
    border-radius: var(--radius-full);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-accent);
    color: var(--color-gray-950);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl), 0 0 30px rgba(200, 164, 92, 0.3);
}

.btn-outline {
    background: transparent;
    color: var(--color-white);
    border: 2px solid rgba(255, 255, 255, 0.25);
}

.btn-outline:hover {
    border-color: var(--color-white);
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-2px);
}

.btn-submit {
    width: 100%;
    justify-content: center;
    padding: 16px 32px;
    font-size: 17px;
}

.btn-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* ----- 区块通用样式 ----- */
.section {
    padding: var(--section-padding);
}

.section-alt {
    background-color: var(--color-gray-50);
}

.section-header {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 64px;
}

.section-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 12px;
    padding: 4px 16px;
    border: 1px solid var(--color-accent);
    border-radius: var(--radius-full);
    background: rgba(200, 164, 92, 0.06);
}

.section-title {
    font-size: 42px;
    font-weight: 800;
    color: var(--color-gray-900);
    line-height: 1.3;
    margin-bottom: 16px;
    letter-spacing: -1px;
}

.section-title .accent {
    color: var(--color-accent-dark);
}

.section-desc {
    font-size: 18px;
    color: var(--color-gray-500);
    line-height: 1.6;
}

/* ----- 导航栏 ----- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0;
    transition: all var(--transition-base);
    background: transparent;
}

.header.scrolled {
    background: rgba(15, 23, 42, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    z-index: 10;
}

.logo-icon {
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-accent);
    color: var(--color-gray-950);
    font-size: 20px;
    font-weight: 900;
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}

.logo-name {
    font-size: 18px;
    font-weight: 800;
    color: var(--color-white);
    letter-spacing: 1px;
}

.logo-sub {
    font-size: 10px;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.5);
    letter-spacing: 2px;
    text-transform: uppercase;
}

.nav-list {
    display: flex;
    gap: 4px;
}

.nav-link {
    display: block;
    padding: 8px 18px;
    font-size: 14px;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.75);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-white);
    background: rgba(255, 255, 255, 0.08);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 10;
}

.menu-bar {
    width: 26px;
    height: 2px;
    background: var(--color-white);
    border-radius: 2px;
    transition: all var(--transition-base);
    transform-origin: center;
}

.menu-toggle.active .menu-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.menu-toggle.active .menu-bar:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active .menu-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ----- Hero 区域 ----- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-hero);
    overflow: hidden;
}

.hero-particles {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(37, 99, 235, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(200, 164, 92, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 80%, rgba(37, 99, 235, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    text-align: center;
    z-index: 2;
    padding: 120px 0 80px;
}

.hero-badge {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-accent);
    padding: 6px 20px;
    border: 1px solid rgba(200, 164, 92, 0.3);
    border-radius: var(--radius-full);
    margin-bottom: 32px;
    letter-spacing: 2px;
    background: rgba(200, 164, 92, 0.05);
    backdrop-filter: blur(10px);
}

.hero-title {
    font-size: clamp(36px, 5vw, 64px);
    font-weight: 900;
    color: var(--color-white);
    line-height: 1.2;
    letter-spacing: -2px;
    margin-bottom: 24px;
}

.hero-title-line {
    display: block;
}

.hero-title-line.accent {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.55);
    max-width: 640px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 64px;
}

/* Hero 统计数字 */
.hero-stats {
    display: flex;
    justify-content: center;
    gap: 64px;
    flex-wrap: wrap;
}

.hero-stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 40px;
    font-weight: 900;
    color: var(--color-white);
    letter-spacing: -1px;
    line-height: 1;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.45);
    letter-spacing: 1px;
}

.hero-scroll {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: rgba(255, 255, 255, 0.35);
    font-size: 12px;
    letter-spacing: 2px;
    animation: bounce-down 2s ease-in-out infinite;
    z-index: 2;
}

@keyframes bounce-down {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}

/* ----- 关于我们 ----- */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-image {
    position: relative;
}

.about-image-main {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.about-image-placeholder {
    background: var(--gradient-dark);
    border-radius: var(--radius-lg);
}

.about-image-placeholder svg {
    width: 100%;
    height: auto;
    display: block;
}

.about-card-floating {
    position: absolute;
    bottom: -24px;
    right: -24px;
    background: var(--color-white);
    padding: 24px 32px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    text-align: center;
    border: 1px solid var(--color-gray-100);
}

.about-card-number {
    display: block;
    font-size: 32px;
    font-weight: 900;
    color: var(--color-accent-dark);
    line-height: 1;
}

.about-card-label {
    font-size: 13px;
    color: var(--color-gray-500);
    margin-top: 4px;
    letter-spacing: 1px;
}

.about-heading {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: 20px;
    letter-spacing: -0.5px;
}

.about-text {
    color: var(--color-gray-600);
    margin-bottom: 16px;
    font-size: 15px;
    line-height: 1.8;
}

.about-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 32px;
}

.about-feature {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}

.feature-icon {
    flex-shrink: 0;
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-gray-50);
    border-radius: var(--radius-md);
    color: var(--color-primary-light);
    border: 1px solid var(--color-gray-100);
}

.feature-info h4 {
    font-size: 15px;
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: 4px;
}

.feature-info p {
    font-size: 13px;
    color: var(--color-gray-500);
    line-height: 1.5;
}

/* ----- 核心服务 ----- */
.services-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.service-card {
    background: var(--color-white);
    padding: 36px 28px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-gray-200);
    transition: all var(--transition-base);
    position: relative;
    box-shadow: var(--shadow-sm);
}

.service-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}

.service-card.featured {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 1px var(--color-accent), var(--shadow-lg);
    background: linear-gradient(180deg, rgba(200, 164, 92, 0.03) 0%, var(--color-white) 30%);
}

.service-badge {
    position: absolute;
    top: 0;
    right: 24px;
    background: var(--gradient-accent);
    color: var(--color-gray-950);
    font-size: 11px;
    font-weight: 700;
    padding: 4px 14px;
    border-radius: 0 0 8px 8px;
    letter-spacing: 1px;
}

.service-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-gray-50);
    border-radius: var(--radius-md);
    color: var(--color-primary-light);
    margin-bottom: 20px;
}

.service-card.featured .service-icon {
    background: linear-gradient(135deg, rgba(200, 164, 92, 0.15), rgba(200, 164, 92, 0.05));
    color: var(--color-accent-dark);
}

.service-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: 12px;
}

.service-card > p {
    font-size: 14px;
    color: var(--color-gray-500);
    line-height: 1.7;
    margin-bottom: 20px;
}

.service-features {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.service-features li {
    font-size: 13px;
    color: var(--color-gray-600);
    padding-left: 20px;
    position: relative;
    line-height: 1.5;
}

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

/* ----- 成功案例 ----- */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 28px;
}

.case-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-gray-100);
    transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}

.case-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 40px rgba(15, 36, 64, 0.12), 0 0 0 1px rgba(200, 164, 92, 0.2);
}

.case-thumb {
    position: relative;
    height: 160px;
    overflow: hidden;
}

.case-thumb-bg {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #0f2440 0%, #1a3a5c 50%, #0f2b4c 100%);
    position: relative;
}

.case-thumb-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 30% 50%, rgba(255,255,255,0.03) 0%, transparent 60%);
}

.case-thumb-icon {
    position: relative;
    z-index: 1;
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 16px;
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.1);
    backdrop-filter: blur(4px);
    color: rgba(255,255,255,0.7);
}

.case-tag {
    position: absolute;
    top: 16px;
    left: 16px;
    font-size: 10px;
    font-weight: 600;
    padding: 3px 10px;
    color: rgba(255,255,255,0.85);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 4px;
    letter-spacing: 2px;
    text-transform: uppercase;
    background: rgba(255,255,255,0.06);
    backdrop-filter: blur(8px);
    z-index: 2;
}

.case-body {
    padding: 28px 24px 24px;
}

.case-body h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: 10px;
    letter-spacing: -0.3px;
    line-height: 1.4;
}

.case-body > p {
    font-size: 13px;
    color: var(--color-gray-500);
    line-height: 1.75;
    margin-bottom: 18px;
}

.case-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.case-tech span {
    font-size: 11px;
    padding: 3px 10px;
    background: var(--color-gray-50);
    color: var(--color-gray-500);
    border-radius: 3px;
    font-weight: 500;
    font-family: var(--font-mono);
    letter-spacing: 0.3px;
    border: 1px solid var(--color-gray-100);
}

/* ----- 技术实力 ----- */
.tech-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.tech-category {
    background: var(--color-white);
    padding: 32px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-gray-200);
    box-shadow: var(--shadow-sm);
}

.tech-category h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--color-gray-100);
}

.tech-items {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.tech-item {
    display: flex;
    align-items: center;
    gap: 16px;
}

.tech-name {
    width: 160px;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-gray-700);
    flex-shrink: 0;
}

.tech-level {
    flex: 1;
    height: 8px;
    background: var(--color-gray-100);
    border-radius: var(--radius-full);
    position: relative;
    overflow: hidden;
}

.tech-level::after {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: var(--level);
    background: var(--gradient-accent);
    border-radius: var(--radius-full);
    transition: width 1.5s ease-in-out;
}

/* ----- 合作流程 ----- */
.process-steps {
    display: flex;
    gap: 0;
    position: relative;
}

.process-steps::before {
    content: '';
    position: absolute;
    top: 56px;
    left: 10%;
    right: 10%;
    height: 2px;
    background: var(--color-gray-200);
    z-index: 0;
}

.process-step {
    flex: 1;
    text-align: center;
    position: relative;
    z-index: 1;
    padding: 0 16px;
}

.step-number {
    font-size: 72px;
    font-weight: 900;
    color: var(--color-gray-100);
    line-height: 1;
    margin-bottom: -20px;
    font-family: var(--font-mono);
}

.step-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-white);
    border: 2px solid var(--color-gray-200);
    border-radius: 50%;
    color: var(--color-primary-light);
    position: relative;
    z-index: 2;
}

.process-step:hover .step-icon {
    border-color: var(--color-accent);
    color: var(--color-accent-dark);
    box-shadow: 0 0 0 8px rgba(200, 164, 92, 0.08);
}

.process-step h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: 8px;
}

.process-step p {
    font-size: 13px;
    color: var(--color-gray-500);
    line-height: 1.6;
}

/* ----- 联系我们 ----- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 64px;
    align-items: start;
}

.contact-info h3 {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.contact-info > p {
    color: var(--color-gray-500);
    font-size: 15px;
    line-height: 1.7;
    margin-bottom: 32px;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-detail {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.contact-icon-wrap {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-gray-50);
    border-radius: var(--radius-md);
    color: var(--color-primary-light);
    flex-shrink: 0;
    border: 1px solid var(--color-gray-100);
}

.contact-label {
    display: block;
    font-size: 12px;
    color: var(--color-gray-400);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 2px;
}

.contact-value {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-gray-900);
}

/* 表单 */
.contact-form-wrap {
    background: var(--color-white);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-gray-200);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-gray-700);
    margin-bottom: 8px;
}

.required {
    color: #ef4444;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    font-size: 14px;
    font-family: inherit;
    color: var(--color-gray-900);
    background: var(--color-gray-50);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(200, 164, 92, 0.1);
    background: var(--color-white);
}

.form-group input.error,
.form-group textarea.error {
    border-color: #ef4444;
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form-error {
    display: block;
    font-size: 12px;
    color: #ef4444;
    margin-top: 4px;
    min-height: 18px;
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-message {
    margin-top: 16px;
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    display: none;
}

.form-message.success {
    display: block;
    background: #f0fdf4;
    color: #16a34a;
    border: 1px solid #bbf7d0;
}

.form-message.error {
    display: block;
    background: #fef2f2;
    color: #dc2626;
    border: 1px solid #fecaca;
}

/* 提交按钮加载动画 */
@keyframes spin {
    to { transform: rotate(360deg); }
}

.spinner {
    animation: spin 1s linear infinite;
}

/* ----- 页脚 ----- */
.footer {
    background: var(--color-gray-950);
    color: rgba(255, 255, 255, 0.6);
    padding: 80px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
    gap: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}

.footer-logo .logo-name {
    font-size: 20px;
    font-weight: 800;
    color: var(--color-white);
}

.footer-desc {
    font-size: 14px;
    line-height: 1.7;
    margin-bottom: 20px;
    max-width: 320px;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-sm);
    color: rgba(255, 255, 255, 0.5);
    transition: all var(--transition-fast);
}

.social-link:hover {
    background: var(--color-accent);
    color: var(--color-gray-950);
}

.footer-links h4,
.footer-contact h4 {
    font-size: 14px;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 20px;
    letter-spacing: 1px;
}

.footer-links ul,
.footer-contact ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.5);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-accent);
}

.footer-contact ul li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 13px;
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.5);
}

.footer-contact ul li svg {
    flex-shrink: 0;
    margin-top: 2px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0;
    font-size: 13px;
    flex-wrap: wrap;
    gap: 12px;
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.35);
}

.footer-bottom a:hover {
    color: var(--color-accent);
}

/* ----- 返回顶部 ----- */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    background: var(--color-primary);
    color: var(--color-white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px);
    transition: all var(--transition-base);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--color-primary-light);
    transform: translateY(-4px);
}

/* ----- 动画 ----- */
.reveal {
    opacity: 0;
    transform: translateY(32px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* 粒子样式 */
.particle {
    position: absolute;
    width: 3px;
    height: 3px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    pointer-events: none;
}

.particle-dot {
    width: 2px;
    height: 2px;
    background: rgba(200, 164, 92, 0.3);
}

/* ============================================================
   响应式设计
   ============================================================ */

/* 平板设备 (≤1024px) */
@media (max-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }

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

    .about-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .about-card-floating {
        bottom: -16px;
        right: 16px;
        padding: 16px 24px;
    }

    .about-image-main {
        max-width: 500px;
        margin: 0 auto;
    }

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

    .process-steps {
        flex-wrap: wrap;
        gap: 32px;
    }

    .process-steps::before {
        display: none;
    }

    .process-step {
        flex: 0 0 calc(33.33% - 22px);
    }

    .section-title {
        font-size: 34px;
    }
}

/* 手机设备 (≤768px) */
@media (max-width: 768px) {
    /* 导航 */
    .header .container {
        height: 64px;
    }

    .menu-toggle {
        display: flex;
    }

    .nav {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(15, 23, 42, 0.98);
        backdrop-filter: blur(20px);
        display: flex;
        align-items: center;
        justify-content: center;
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }

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

    .nav-list {
        flex-direction: column;
        align-items: center;
        gap: 16px;
    }

    .nav-link {
        font-size: 18px;
        padding: 12px 32px;
    }

    /* Hero */
    .hero-content {
        padding: 100px 0 60px;
    }

    .hero-stats {
        gap: 32px;
    }

    .hero-stat {
        flex: 0 0 calc(50% - 16px);
    }

    .stat-number {
        font-size: 30px;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .hero-actions .btn {
        width: 100%;
        justify-content: center;
        max-width: 280px;
    }

    /* 通用 */
    .section {
        padding: var(--section-padding-mobile);
    }

    .section-title {
        font-size: 28px;
    }

    .section-desc {
        font-size: 15px;
    }

    .section-header {
        margin-bottom: 40px;
    }

    /* 关于 */
    .about-features {
        grid-template-columns: 1fr;
    }

    .about-heading {
        font-size: 24px;
    }

    /* 服务 */
    .services-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

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

    /* 流程 */
    .process-step {
        flex: 0 0 calc(50% - 16px);
    }

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

    .contact-form-wrap {
        padding: 28px 20px;
    }

    /* 页脚 */
    .footer {
        padding: 60px 0 0;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 36px;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 42px;
        height: 42px;
    }
}

/* 小屏设备 (≤480px) */
@media (max-width: 480px) {
    .hero-stats {
        gap: 20px;
    }

    .hero-stat {
        flex: 0 0 calc(50% - 10px);
    }

    .stat-number {
        font-size: 26px;
    }

    .hero-badge {
        font-size: 11px;
        padding: 4px 14px;
    }

    .section-title {
        font-size: 24px;
    }

    .process-step {
        flex: 0 0 100%;
    }

    .about-card-floating {
        display: none;
    }
}

/* 大屏优化 (≥1440px) */
@media (min-width: 1440px) {
    .hero-title {
        font-size: 72px;
    }

    .container {
        max-width: 1280px;
    }

    .services-grid {
        gap: 32px;
    }
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}