/* ===================================
   CSS Variables (Design Tokens)
   基于原博客配色方案
   =================================== */
:root {
    /* Colors - 原博客配色 */
    --primary-color: #3cd6dd;        /* 青色 - design */
    --secondary-color: #7f7ddd;      /* 紫色 - media */
    --accent-color: #b955c5;         /* 粉紫 - art */
    --success-color: #bfed44;        /* 黄绿 - social */
    --dark-color: #08073a;           /* 深蓝黑 */
    --light-color: #fafafa;          /* 浅灰 */
    --gray-color: #777777;
    --white: #ffffff;
    --black: #000000;
    --footer-dark: #06274a;

    /* 轨道圆点颜色 */
    --orbit-pink: #b955c5;
    --orbit-cyan: #3cd6dd;
    --orbit-purple: #7f7ddd;

    /* Gradients - 原博客渐变 */
    --gradient-primary: linear-gradient(115deg, #06274a, #192e3c 43%, #080808);
    --gradient-hero: linear-gradient(135deg, rgba(60, 214, 221, 0.1) 0%, rgba(127, 125, 221, 0.1) 50%, rgba(185, 85, 197, 0.1) 100%);

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB',
                   'Microsoft YaHei', sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Courier New', monospace;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;

    /* Z-index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal: 1040;
    --z-popover: 1050;
    --z-tooltip: 1060;
}

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

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

body {
    font-family: var(--font-family);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

ul, ol {
    list-style: none;
}

/* ===================================
   Utility Classes
   =================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.img-fluid {
    max-width: 100%;
    height: auto;
}

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

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Grid System */
.grid {
    display: grid;
    gap: var(--spacing-xl);
}

.grid-cols-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

/* ===================================
   Header & Navigation
   =================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-fixed);
    background-color: rgba(44, 62, 80, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

/* 滚动时缩小导航栏 */
.header.shrink {
    background-color: rgba(44, 62, 80, 0.98);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.header.shrink .navbar {
    padding: calc(var(--spacing-md) * 0.6) 0;
}

.header.shrink .logo-img {
    width: 32px;
    height: 32px;
}

.header.shrink .navbar-brand a {
    font-size: 1.1rem;
}

.navbar {
    padding: var(--spacing-md) 0;
    transition: padding var(--transition-base);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.navbar-brand a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--white);
    font-size: 1.25rem;
    font-weight: 600;
    transition: font-size var(--transition-base);
}

.logo-img {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.logo-text {
    color: var(--white);
    font-weight: 600;
}

.navbar-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: var(--spacing-sm);
}

.navbar-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--white);
    transition: var(--transition-fast);
}

.navbar-menu {
    display: flex;
}

.navbar-nav {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-link {
    color: var(--white);
    font-size: 0.95rem;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--white);
}

.nav-item.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background-color: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-sm);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-base);
}

.nav-item.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--dark-color);
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.dropdown-menu li a:hover {
    background-color: var(--light-color);
}

/* ===================================
   Hero Section
   =================================== */
.hero-section {
    position: relative;
    min-height: 610px;
    display: flex;
    align-items: center;
    overflow: hidden;
    padding-top: 80px;
    background: transparent;
}

.canvas-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.hero-text {
    color: var(--white);
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    line-height: 1.2;
    color: var(--white);
}

.hero-description {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xl);
    color: rgba(255, 255, 255, 0.85);
}

/* Orbit Animation */
.orbit-container {
    position: relative;
    width: 400px;
    height: 400px;
    margin: 0 auto;
}

.orbit-center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 10;
}

.orbit-logo {
    width: 64px;
    height: 64px;
}

.orbit {
    position: absolute;
    top: 50%;
    left: 50%;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    transform: translate(-50%, -50%);
}

.orbit-1 {
    width: 160px;
    height: 160px;
    border-color: rgba(255, 255, 255, 0.7);
}

.orbit-2 {
    width: 240px;
    height: 240px;
    border-color: rgba(255, 255, 255, 0.5);
    animation: rotate 60s linear infinite;
}

.orbit-3 {
    width: 320px;
    height: 320px;
    border-color: rgba(255, 255, 255, 0.3);
    animation: rotate 70s linear infinite;
}

.orbit-item {
    position: absolute;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.2), inset 0 1px 2px 0 rgba(255, 255, 255, 0.2);
}

.orbit-item-1 {
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--orbit-pink);
}

.orbit-item-2 {
    top: 50%;
    right: 0;
    transform: translateY(-50%);
    background-color: var(--orbit-cyan);
}

.orbit-item-3 {
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--orbit-purple);
}

.orbit-dot {
    position: absolute;
    width: 8px;
    height: 8px;
    background-color: rgba(255, 255, 255, 0.9);
    border-radius: 50%;
    box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.1);
}

.orbit-dot-1 {
    top: 0;
    left: 50%;
    transform: translateX(-50%);
}

.orbit-dot-2 {
    top: 50%;
    right: 0;
    transform: translateY(-50%);
}

.orbit-dot-3 {
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
}

.ripple-effect {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100px;
    height: 100px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    animation: ripple 10s ease-out infinite cubic-bezier(0.21, 0.53, 0.56, 0.8);
}

@keyframes ripple {
    0% {
        width: 100px;
        height: 100px;
        opacity: 1;
    }
    100% {
        width: 460px;
        height: 460px;
        opacity: 0;
    }
}

@keyframes rotate {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.1rem;
    font-weight: 400;
    text-align: center;
    border-radius: 0.1em;
    transition: all 200ms linear;
    cursor: pointer;
    box-shadow: none;
}

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

.btn-primary:hover {
    background-color: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.2), inset 0 1px 2px 0 rgba(255, 255, 255, 0.2);
}

.btn-design {
    color: var(--primary-color);
}

.btn-design:hover {
    color: var(--white);
    background: rgba(60, 214, 221, 0.9) !important;
    box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.2), inset 0 1px 2px 0 rgba(255, 255, 255, 0.2);
}

.btn-media {
    color: var(--secondary-color);
}

.btn-media:hover {
    color: var(--white);
    background: rgba(127, 125, 221, 0.9) !important;
    box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.2), inset 0 1px 2px 0 rgba(255, 255, 255, 0.2);
}

.btn-social {
    color: var(--success-color);
}

.btn-social:hover {
    color: var(--white);
    background: rgba(191, 237, 68, 0.9) !important;
    box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.2), inset 0 1px 2px 0 rgba(255, 255, 255, 0.2);
}

.btn-art {
    color: var(--accent-color);
}

.btn-art:hover {
    color: var(--white);
    background: rgba(185, 85, 197, 0.9) !important;
    box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.2), inset 0 1px 2px 0 rgba(255, 255, 255, 0.2);
}

/* ===================================
   Sections
   =================================== */
.features-section {
    padding: var(--spacing-3xl) 0;
    background-color: var(--light-color);
}

.logo-row {
    display: flex;
    justify-content: space-around;
    align-items: center;
    gap: var(--spacing-xl);
}

.logo-row img {
    width: 80px;
    height: 80px;
    opacity: 0.6;
    transition: var(--transition-base);
}

.logo-row img:hover {
    opacity: 1;
    transform: scale(1.1);
}

.community-section,
.process-section {
    padding: var(--spacing-3xl) 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.section-subtitle {
    text-align: center;
    font-size: 1.125rem;
    color: var(--gray-color);
    margin-bottom: var(--spacing-3xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Cards */
.card {
    background-color: var(--white);
    border-radius: 0.1em;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
    cursor: pointer;
    border: 1px solid #eeeeee;
    padding: 35px 0;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.card-design:hover {
    border: 1px solid var(--primary-color);
}

.card-media:hover {
    border: 1px solid var(--secondary-color);
}

.card-social:hover {
    border: 1px solid var(--success-color);
}

.card-art:hover {
    border: 1px solid var(--accent-color);
}

.card-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.card-body {
    padding: var(--spacing-xl);
}

.card-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.card-text {
    color: var(--gray-color);
    margin-bottom: var(--spacing-lg);
}

/* Process Section */
.process-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.process-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.process-item {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.process-icon {
    width: 48px;
    height: 48px;
    flex-shrink: 0;
}

.process-text h4 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.25rem;
}

/* ===================================
   Footer
   =================================== */
.footer {
    background-color: var(--dark-color);
    color: var(--light-color);
}

.footer-cta {
    background: var(--gradient-primary);
    padding: var(--spacing-3xl) 0;
    text-align: center;
    color: var(--white);
}

.footer-cta p {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
}

.footer-content {
    padding: var(--spacing-3xl) 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
}

.footer-col h4 {
    color: var(--white);
    margin-bottom: var(--spacing-md);
    font-size: 1.125rem;
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-col a {
    color: var(--gray-color);
    transition: var(--transition-fast);
}

.footer-col a:hover {
    color: var(--white);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--spacing-xl) 0;
}

.footer-bottom-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.copyright a {
    color: var(--gray-color);
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

/* ===================================
   Back to Top Button
   =================================== */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 48px;
    height: 48px;
    background-color: var(--primary-color);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-base);
    z-index: var(--z-fixed);
}

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

.back-to-top:hover {
    background-color: #2980b9;
    transform: translateY(-4px);
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
    .navbar-toggle {
        display: flex;
    }

    .navbar-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--dark-color);
        padding: var(--spacing-lg);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-20px);
        transition: all var(--transition-base);
    }

    .navbar-menu.active {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .navbar-nav {
        flex-direction: column;
        align-items: flex-start;
    }

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

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

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

    .footer-bottom-content {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
}