/* ============================================
   Ozon 掘金 PRO - 公共样式文件
   渐变流体风格设计系统
   ============================================ */

/* --- 1. CSS变量定义（渐变流体风格） --- */
:root {
    /* 背景色 */
    --bg-color: #FAFAFA;
    --bg-dark: #0F0F1E;
    
    /* 文字颜色 */
    --text-main: #111111;
    --text-sub: #666666;
    --text-light: #999999;
    --text-white: #FFFFFF;
    
    /* 品牌色 - 粉色系（来自logo） */
    --brand-pink: #FF6B9D;
    --brand-pink-light: #FFB3D1;
    --brand-pink-dark: #FF4A7C;
    
    /* 品牌色 - 蓝紫色系（原有主题） */
    --brand-purple: #6D28D9;
    --brand-purple-light: #8B5CF6;
    --brand-purple-dark: #5B21B6;
    
    /* 渐变流体效果 */
    --gradient-primary: linear-gradient(135deg, #FF6B9D 0%, #6D28D9 50%, #8B5CF6 100%);
    --gradient-secondary: linear-gradient(135deg, #FFB3D1 0%, #8B5CF6 100%);
    --gradient-accent: linear-gradient(135deg, #FF6B9D 0%, #6D28D9 100%);
    --gradient-fluent: radial-gradient(circle at 30% 50%, rgba(255, 107, 157, 0.3) 0%, rgba(109, 40, 217, 0.2) 50%, rgba(139, 92, 246, 0.3) 100%);
    
    /* 流体动画渐变 */
    --gradient-fluid-1: linear-gradient(135deg, #FF6B9D 0%, #6D28D9 100%);
    --gradient-fluid-2: linear-gradient(135deg, #8B5CF6 0%, #FF6B9D 100%);
    --gradient-fluid-3: linear-gradient(135deg, #6D28D9 0%, #FFB3D1 100%);
    
    /* 边框和阴影 */
    --border-light: rgba(0, 0, 0, 0.08);
    --border-gradient: linear-gradient(135deg, rgba(255, 107, 157, 0.3), rgba(109, 40, 217, 0.3));
    --shadow-float: 0 20px 40px -10px rgba(255, 107, 157, 0.2);
    --shadow-glow: 0 0 30px rgba(109, 40, 217, 0.3);
    --shadow-pink: 0 10px 30px rgba(255, 107, 157, 0.25);
    --shadow-purple: 0 10px 30px rgba(109, 40, 217, 0.25);
    
    /* 动画曲线 */
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    
    /* 字体 */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', Monaco, monospace;
}

/* --- 2. 基础重置 --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: var(--font-main);
    overflow-x: hidden;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    position: relative;
}

/* 流体背景效果 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-fluent);
    opacity: 0.4;
    z-index: -1;
    pointer-events: none;
    animation: fluidBackground 20s ease-in-out infinite;
}

@keyframes fluidBackground {
    0%, 100% {
        background: radial-gradient(circle at 30% 50%, rgba(255, 107, 157, 0.3) 0%, rgba(109, 40, 217, 0.2) 50%, rgba(139, 92, 246, 0.3) 100%);
    }
    33% {
        background: radial-gradient(circle at 70% 30%, rgba(109, 40, 217, 0.3) 0%, rgba(255, 107, 157, 0.2) 50%, rgba(139, 92, 246, 0.3) 100%);
    }
    66% {
        background: radial-gradient(circle at 50% 70%, rgba(139, 92, 246, 0.3) 0%, rgba(255, 107, 157, 0.2) 50%, rgba(109, 40, 217, 0.3) 100%);
    }
}

/* --- 3. 排版 --- */
h1, h2, h3, h4, h5, h6 {
    letter-spacing: -0.03em;
    font-weight: 800;
    line-height: 1.2;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }

p {
    color: var(--text-sub);
    margin-bottom: 1rem;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s var(--ease-out-expo);
}

/* --- 4. 导航栏 --- */
nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1rem 5%;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(250, 250, 250, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
    z-index: 999;
    transition: all 0.3s var(--ease-out-expo);
}

nav.scrolled {
    padding: 0.7rem 5%;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    background: rgba(250, 250, 250, 0.95);
}

.nav-container {
    max-width: 1200px;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand {
    font-size: 1.2rem;
    font-weight: 900;
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.brand-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    padding: 4px;
}

.brand-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
    list-style: none;
}

.nav-menu li {
    position: relative;
}

.nav-menu a {
    color: var(--text-main);
    font-size: 0.95rem;
    font-weight: 500;
    white-space: nowrap;
    position: relative;
    padding: 0.5rem 0;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width 0.3s var(--ease-out-expo);
}

@media (hover: hover) {
    .nav-menu a:hover {
        color: var(--brand-purple);
    }
    .nav-menu a:hover::after {
        width: 100%;
    }
}

.nav-menu a.active {
    color: var(--brand-purple);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu a.active::after {
    width: 100%;
}

/* 移动端菜单按钮 */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-main);
    transition: all 0.3s var(--ease-out-expo);
    border-radius: 2px;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(7px, 7px);
    background: var(--brand-purple);
}

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

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
    background: var(--brand-purple);
}

/* --- 5. 容器和布局 --- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 5%;
    position: relative;
}

.section {
    padding: 6rem 0;
    position: relative;
}

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

/* --- 6. 技术标签（Tech Label）--- */
.tech-label,
.tech-tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--brand-purple);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: rgba(255, 107, 157, 0.1);
    padding: 4px 12px;
    border-radius: 20px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 0.8rem;
    border: 1px solid rgba(255, 107, 157, 0.2);
}

.tech-label::before,
.tech-tag::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: inline-block;
}

/* --- 7. 动画类 --- */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s var(--ease-out-expo), transform 0.8s var(--ease-out-expo);
}

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

.reveal {
    opacity: 0;
    animation: revealUp 1s var(--ease-out-expo) forwards;
}

@keyframes revealUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.d-1 { animation-delay: 0.1s; }
.d-2 { animation-delay: 0.2s; }
.d-3 { animation-delay: 0.3s; }

/* --- 8. 流体渐变效果 --- */
.fluid-gradient {
    position: relative;
    background: var(--gradient-primary);
    background-size: 200% 200%;
    animation: gradientShift 8s ease infinite;
}

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

.fluid-bg {
    position: relative;
    overflow: hidden;
}

.fluid-bg::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: var(--gradient-primary);
    opacity: 0.1;
    animation: fluidRotate 20s linear infinite;
    border-radius: 50%;
}

@keyframes fluidRotate {
    0% {
        transform: rotate(0deg) scale(1);
        opacity: 0.1;
    }
    50% {
        transform: rotate(180deg) scale(1.2);
        opacity: 0.15;
    }
    100% {
        transform: rotate(360deg) scale(1);
        opacity: 0.1;
    }
}

/* --- 9. 按钮样式 --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.8rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s var(--ease-out-expo);
    border: none;
    font-size: 1rem;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-pink);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-pink), 0 8px 25px rgba(255, 107, 157, 0.4);
}

.btn-outline {
    border: 2px solid;
    border-image: var(--gradient-primary) 1;
    background: transparent;
    color: var(--text-main);
    position: relative;
}

.btn-outline::after {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity 0.3s;
    z-index: -1;
}

.btn-outline:hover {
    color: white;
}

.btn-outline:hover::after {
    opacity: 1;
}

.btn-white {
    background: white;
    color: var(--text-main);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.btn-white:hover {
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.3);
}

/* --- 10. 卡片样式 --- */
.card {
    background: white;
    border: 1px solid var(--border-light);
    border-radius: 24px;
    padding: 2rem;
    transition: all 0.3s var(--ease-out-expo);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity 0.3s;
    z-index: -1;
}

@media (hover: hover) {
    .card:hover {
        transform: translateY(-5px);
        box-shadow: var(--shadow-float);
        border-color: transparent;
    }
    
    .card:hover::before {
        opacity: 0.05;
    }
}

.hud-card {
    background: white;
    border: 1px solid var(--border-light);
    padding: 2rem;
    position: relative;
    transition: all 0.3s var(--ease-out-expo);
}

.hud-card .corner {
    position: absolute;
    width: 10px;
    height: 10px;
    border: 2px solid;
    border-image: var(--gradient-primary) 1;
    opacity: 0;
    transition: opacity 0.3s;
}

.hud-card .corner.tl {
    top: -1px;
    left: -1px;
    border-right: 0;
    border-bottom: 0;
}

.hud-card .corner.br {
    bottom: -1px;
    right: -1px;
    border-left: 0;
    border-top: 0;
}

@media (hover: hover) {
    .hud-card:hover {
        transform: translateY(-5px);
        border-color: var(--brand-purple);
        box-shadow: var(--shadow-purple);
    }
    
    .hud-card:hover .corner {
        opacity: 1;
    }
}

/* --- 11. 粒子背景 --- */
.particles-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.particle {
    position: absolute;
    width: 3px;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: 50%;
    opacity: 0.3;
    animation: float-particle 20s infinite ease-in-out;
}

@keyframes float-particle {
    0%, 100% {
        transform: translate(0, 0) scale(1);
        opacity: 0.2;
    }
    25% {
        transform: translate(100px, -100px) scale(1.5);
        opacity: 0.4;
    }
    50% {
        transform: translate(-50px, -200px) scale(0.8);
        opacity: 0.3;
    }
    75% {
        transform: translate(-100px, 100px) scale(1.2);
        opacity: 0.35;
    }
}

/* --- 12. 响应式设计 --- */
@media (max-width: 900px) {
    .section {
        padding: 4rem 0;
    }
    
    .container {
        padding: 0 4%;
    }
}

@media (max-width: 768px) {
    nav {
        padding: 0.8rem 4%;
    }
    
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 2rem;
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        gap: 0;
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-menu li {
        width: 100%;
    }
    
    .nav-menu a {
        display: block;
        padding: 1.2rem 0;
        font-size: 1.1rem;
        border-bottom: 1px solid var(--border-light);
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .section {
        padding: 3rem 0;
    }
    
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    h3 { font-size: 1.5rem; }
}

@media (max-width: 480px) {
    .container {
        padding: 0 3%;
    }
    
    .btn {
        padding: 0.7rem 1.5rem;
        font-size: 0.9rem;
    }
}

/* --- 13. 工具类 --- */
.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.mb-3 { margin-bottom: 3rem; }

.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}