/* ==================== 基础样式 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #00d4ff;
    --primary-dark: #0099cc;
    --secondary: #7c3aed;
    --accent: #f59e0b;
    --bg-dark: #0a0a1a;
    --bg-card: rgba(20, 20, 40, 0.8);
    --bg-card-hover: rgba(30, 30, 60, 0.9);
    --text-primary: #ffffff;
    --text-secondary: #a0a0c0;
    --border-color: rgba(0, 212, 255, 0.3);
    --glow: 0 0 20px rgba(0, 212, 255, 0.5);
    --admin-color: #ff6b6b;
}

body {
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* ==================== 星空背景动画 ==================== */
.stars, .stars2, .stars3 {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.stars {
    background: 
        radial-gradient(2px 2px at 20px 30px, #fff, transparent),
        radial-gradient(2px 2px at 40px 70px, rgba(255,255,255,0.8), transparent),
        radial-gradient(1px 1px at 90px 40px, #fff, transparent),
        radial-gradient(2px 2px at 160px 120px, rgba(255,255,255,0.9), transparent),
        radial-gradient(1px 1px at 230px 80px, #fff, transparent),
        radial-gradient(2px 2px at 300px 150px, rgba(255,255,255,0.7), transparent);
    background-repeat: repeat;
    background-size: 350px 350px;
    animation: starsMove 100s linear infinite;
    opacity: 0.5;
}

.stars2 {
    background: 
        radial-gradient(1px 1px at 50px 100px, #00d4ff, transparent),
        radial-gradient(2px 2px at 150px 50px, rgba(124, 58, 237, 0.8), transparent),
        radial-gradient(1px 1px at 250px 200px, #00d4ff, transparent);
    background-repeat: repeat;
    background-size: 400px 400px;
    animation: starsMove 150s linear infinite;
    opacity: 0.3;
}

.stars3 {
    background: 
        radial-gradient(3px 3px at 100px 150px, rgba(255,255,255,0.5), transparent),
        radial-gradient(2px 2px at 200px 100px, rgba(0, 212, 255, 0.4), transparent);
    background-repeat: repeat;
    background-size: 500px 500px;
    animation: starsMove 200s linear infinite;
    opacity: 0.4;
}

@keyframes starsMove {
    from { transform: translateY(0); }
    to { transform: translateY(-1000px); }
}

/* ==================== 导航栏 ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: rgba(10, 10, 26, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: bold;
}

.logo-icon {
    color: var(--primary);
    text-shadow: var(--glow);
    animation: pulse 2s ease-in-out infinite;
}

.logo-text {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary);
    box-shadow: var(--glow);
}

.nav-user, .nav-user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-name {
    color: var(--primary);
    font-weight: 600;
}

.admin-badge {
    background: linear-gradient(135deg, #ff6b6b, #ee5a24);
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: bold;
    animation: glow 2s ease-in-out infinite;
}

@keyframes glow {
    0%, 100% { box-shadow: 0 0 5px rgba(255, 107, 107, 0.5); }
    50% { box-shadow: 0 0 20px rgba(255, 107, 107, 0.8); }
}

/* ==================== 按钮样式 ==================== */
.btn-login, .btn-register, .btn-logout {
    padding: 0.5rem 1.2rem;
    border: none;
    border-radius: 25px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.btn-login:hover {
    background: var(--primary);
    color: var(--bg-dark);
    box-shadow: var(--glow);
}

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

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

.btn-logout {
    background: rgba(255, 107, 107, 0.2);
    color: #ff6b6b;
    border: 1px solid #ff6b6b;
}

.btn-logout:hover {
    background: #ff6b6b;
    color: white;
}

.btn-primary, .btn-secondary {
    padding: 1rem 2rem;
    border: none;
    border-radius: 30px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 212, 255, 0.4);
}

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

.btn-secondary:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.btn-icon {
    font-size: 0.8rem;
}

/* ==================== 主要内容 ==================== */
.main-content {
    padding-top: 80px;
}

/* ==================== 英雄区域 ==================== */
.hero {
    min-height: calc(100vh - 80px);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 4rem;
    gap: 4rem;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 30px;
    margin-bottom: 2rem;
}

.pulse-dot {
    width: 8px;
    height: 8px;
    background: #10b981;
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
}

.hero-title {
    margin-bottom: 1.5rem;
}

.gradient-text {
    font-size: 4rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--primary), var(--secondary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
    line-height: 1.1;
}

.sub-title {
    display: block;
    font-size: 1.5rem;
    color: var(--text-secondary);
    font-weight: 400;
    margin-top: 0.5rem;
}

.hero-desc {
    color: var(--text-secondary);
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 2rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
}

.hero-stats {
    display: flex;
    gap: 3rem;
}

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

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--primary);
}

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

/* 轨道动画 */
.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.orbit-container {
    position: relative;
    width: 400px;
    height: 400px;
}

.planet {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 50%;
    box-shadow: 
        0 0 60px rgba(0, 212, 255, 0.5),
        inset -20px -20px 40px rgba(0, 0, 0, 0.3);
}

.orbit {
    position: absolute;
    top: 50%;
    left: 50%;
    border: 1px solid rgba(0, 212, 255, 0.2);
    border-radius: 50%;
}

.orbit-1 {
    width: 200px;
    height: 200px;
    margin: -100px 0 0 -100px;
    animation: orbit 10s linear infinite;
}

.orbit-2 {
    width: 280px;
    height: 280px;
    margin: -140px 0 0 -140px;
    animation: orbit 15s linear infinite reverse;
}

.orbit-3 {
    width: 360px;
    height: 360px;
    margin: -180px 0 0 -180px;
    animation: orbit 20s linear infinite;
}

.satellite {
    position: absolute;
    top: -5px;
    left: 50%;
    width: 10px;
    height: 10px;
    background: var(--primary);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--primary);
}

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

/* ==================== 公告区域 ==================== */
.announcements-section {
    padding: 4rem;
    background: linear-gradient(180deg, transparent, rgba(0, 212, 255, 0.05));
}

.section-title {
    font-size: 2rem;
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.section-title .icon {
    color: var(--primary);
}

.announcements-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.announcement-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    padding: 1.5rem;
    transition: all 0.3s ease;
}

.announcement-card:hover {
    background: var(--bg-card-hover);
    transform: translateX(10px);
}

.announcement-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.announcement-title {
    font-size: 1.2rem;
    color: var(--accent);
}

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

.announcement-content {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ==================== 特性区域 ==================== */
.features {
    padding: 4rem;
}

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

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 2rem;
    transition: all 0.3s ease;
}

.feature-card:hover {
    background: var(--bg-card-hover);
    transform: translateY(-10px);
    border-color: var(--primary);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.2), rgba(124, 58, 237, 0.2));
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.feature-icon svg {
    width: 30px;
    height: 30px;
    stroke: var(--primary);
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ==================== 产品展示 ==================== */
.showcase {
    padding: 4rem;
    background: linear-gradient(180deg, rgba(124, 58, 237, 0.05), transparent);
}

.showcase-desc {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 3rem;
}

.showcase-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.showcase-item {
    position: relative;
    border-radius: 20px;
    overflow: hidden;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    transition: all 0.4s ease;
}

.showcase-item:hover {
    transform: translateY(-10px);
    border-color: var(--primary);
    box-shadow: 0 20px 50px rgba(0, 212, 255, 0.3);
}

.showcase-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.4s ease;
}

.showcase-item:hover img {
    transform: scale(1.05);
}

.showcase-large {
    min-height: 350px;
}

.showcase-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(20, 20, 40, 0.9), rgba(10, 10, 26, 0.95));
    padding: 2rem;
}

.showcase-logo img {
    width: auto;
    height: auto;
    max-width: 100%;
    max-height: 100px;
    object-fit: contain;
}

.showcase-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 1.5rem;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.9));
    transform: translateY(100%);
    transition: transform 0.4s ease;
}

.showcase-item:hover .showcase-overlay {
    transform: translateY(0);
}

.showcase-overlay h3 {
    font-size: 1.2rem;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

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

@media (max-width: 768px) {
    .showcase-grid {
        grid-template-columns: 1fr;
    }
    
    .showcase-large {
        grid-row: span 1;
        min-height: 250px;
    }
    
    .showcase {
        padding: 2rem 1rem;
    }
}

/* ==================== 使用说明 ==================== */
.how-to-use {
    padding: 4rem;
    background: linear-gradient(180deg, transparent, rgba(124, 58, 237, 0.05));
}

.steps-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.step {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 2rem;
    text-align: center;
    width: 200px;
    transition: all 0.3s ease;
}

.step:hover {
    transform: translateY(-10px);
    border-color: var(--primary);
}

.step-number {
    font-size: 3rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.step h3 {
    margin: 1rem 0 0.5rem;
}

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

.step-line {
    width: 50px;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
}

/* ==================== 页脚 ==================== */
.footer {
    padding: 2rem 4rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 1.2rem;
    font-weight: bold;
    margin-bottom: 1rem;
}

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

/* ==================== 模态框 ==================== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 2rem;
    width: 100%;
    max-width: 400px;
    animation: modalIn 0.3s ease;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.modal-header h2 {
    font-size: 1.5rem;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 2rem;
    cursor: pointer;
    transition: color 0.3s;
}

.modal-close:hover {
    color: var(--primary);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.form-group input, .form-group textarea, .form-group select {
    width: 100%;
    padding: 0.8rem 1rem;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s;
}

.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 10px rgba(0, 212, 255, 0.3);
}

.form-group textarea {
    min-height: 100px;
    resize: vertical;
}

.btn-submit {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border: none;
    border-radius: 10px;
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

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

.form-switch {
    margin-top: 1.5rem;
    text-align: center;
    color: var(--text-secondary);
}

.form-switch a {
    color: var(--primary);
    text-decoration: none;
}

.form-switch a:hover {
    text-decoration: underline;
}

/* ==================== Toast提示 ==================== */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 1rem 2rem;
    border-radius: 10px;
    color: var(--text-primary);
    z-index: 3000;
    opacity: 0;
    transition: all 0.3s ease;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast.success {
    border-color: #10b981;
    color: #10b981;
}

.toast.error {
    border-color: #ef4444;
    color: #ef4444;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1024px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding: 2rem;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .gradient-text {
        font-size: 3rem;
    }
    
    .orbit-container {
        width: 300px;
        height: 300px;
    }
}

@media (max-width: 768px) {
    .navbar {
        padding: 0.8rem 1rem;
        flex-wrap: wrap;
    }
    
    .nav-brand {
        font-size: 1.2rem;
    }
    
    .nav-links {
        order: 3;
        width: 100%;
        justify-content: center;
        padding-top: 0.8rem;
        gap: 0.8rem;
        flex-wrap: wrap;
    }
    
    .nav-link {
        font-size: 0.85rem;
    }
    
    .nav-user, .nav-user-info {
        gap: 0.5rem;
    }
    
    .btn-login, .btn-register, .btn-logout {
        padding: 0.4rem 0.8rem;
        font-size: 0.85rem;
    }
    
    .hero {
        padding: 1rem;
        margin-top: 100px;
    }
    
    .gradient-text {
        font-size: 1.8rem;
    }
    
    .hero-description {
        font-size: 0.95rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: 0.8rem;
    }
    
    .btn-hero {
        width: 100%;
        padding: 0.8rem 1.5rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 1rem;
    }
    
    .orbit-container {
        width: 200px;
        height: 200px;
        margin: 1rem auto;
    }
    
    .features, .how-to-use, .announcements-section {
        padding: 2rem 1rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .feature-card {
        padding: 1.2rem;
    }
    
    .steps-container {
        flex-direction: column;
    }
    
    .step-line {
        width: 2px;
        height: 30px;
    }
    
    .step-box {
        padding: 1rem;
    }
    
    /* 模态框手机适配 */
    .modal-content {
        width: 95%;
        max-width: none;
        margin: 10px;
        padding: 1.2rem;
        max-height: 90vh;
        overflow-y: auto;
    }
    
    .modal-header h2 {
        font-size: 1.2rem;
    }
    
    .form-group label {
        font-size: 0.9rem;
    }
    
    .form-group input {
        padding: 0.7rem;
        font-size: 1rem;
    }
    
    .btn-submit {
        width: 100%;
        padding: 0.8rem;
    }
    
    /* 公告卡片 */
    .announcement-card {
        padding: 1rem;
    }
    
    .announcement-title {
        font-size: 1rem;
    }
    
    /* Toast提示 */
    .toast {
        width: 90%;
        left: 5%;
        transform: translateX(0) translateY(100px);
        padding: 0.8rem 1rem;
        font-size: 0.9rem;
    }
    
    .toast.show {
        transform: translateX(0) translateY(0);
    }
}

@media (max-width: 480px) {
    .navbar {
        padding: 0.6rem 0.8rem;
    }
    
    .nav-brand {
        font-size: 1rem;
    }
    
    .logo-icon {
        font-size: 1.2rem;
    }
    
    .nav-links {
        gap: 0.5rem;
    }
    
    .nav-link {
        font-size: 0.75rem;
        padding: 0.3rem 0.5rem;
    }
    
    .admin-badge {
        font-size: 0.65rem;
        padding: 0.15rem 0.4rem;
    }
    
    .gradient-text {
        font-size: 1.5rem;
    }
    
    .hero-description {
        font-size: 0.85rem;
    }
    
    .stat-number {
        font-size: 1.5rem;
    }
    
    .orbit-container {
        display: none;
    }
}