/* ===== 全局基础样式 ===== */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #8b5cf6;
    --accent: #06b6d4;
    --dark: #0f172a;
    --darker: #020617;
    --light: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --card-bg: rgba(30, 41, 59, 0.7);
    --glass: rgba(255, 255, 255, 0.06);
    --border-glass: rgba(255, 255, 255, 0.12);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    --radius: 16px;
    --radius-sm: 10px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--darker);
    color: var(--light);
    line-height: 1.6;
    overflow-x: hidden;
}

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

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

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

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

/* ===== 滚动条 ===== */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--darker);
}
::-webkit-scrollbar-thumb {
    background: var(--gray-600);
    border-radius: 8px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--gray-500);
}

/* ===== 导航栏 ===== */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(2, 6, 23, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-glass);
    transition: var(--transition);
}

header.scrolled {
    background: rgba(2, 6, 23, 0.95);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--light);
}

.logo i {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.8rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    color: var(--gray-300);
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
    padding: 4px 0;
    transition: var(--transition);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transition: var(--transition);
    border-radius: 2px;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--light);
}

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

.hamburger {
    display: none;
    background: none;
    border: none;
    color: var(--light);
    font-size: 1.6rem;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 8px;
    transition: var(--transition);
}

.hamburger:hover {
    background: var(--glass);
}

/* ===== 英雄区域 ===== */
#hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 70px;
    background: radial-gradient(ellipse at top left, rgba(99, 102, 241, 0.15), transparent 60%),
                radial-gradient(ellipse at bottom right, rgba(6, 182, 212, 0.1), transparent 60%),
                var(--darker);
    position: relative;
    overflow: hidden;
}

.hero-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 60px;
    padding: 60px 0;
}

.hero-text {
    flex: 1;
    max-width: 620px;
}

.hero-text h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

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

.hero-text p {
    font-size: 1.15rem;
    color: var(--gray-400);
    margin-bottom: 36px;
    max-width: 520px;
}

.hero-search {
    position: relative;
    margin-bottom: 40px;
    max-width: 520px;
}

.hero-search .search-icon {
    position: absolute;
    left: 18px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-500);
    font-size: 1.1rem;
}

.hero-search input {
    width: 100%;
    padding: 16px 18px 16px 52px;
    border-radius: 60px;
    border: 1px solid var(--border-glass);
    background: var(--glass);
    color: var(--light);
    font-size: 1rem;
    font-family: inherit;
    outline: none;
    transition: var(--transition);
    backdrop-filter: blur(8px);
}

.hero-search input::placeholder {
    color: var(--gray-500);
}

.hero-search input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
    background: rgba(255, 255, 255, 0.08);
}

.hero-stats {
    display: flex;
    gap: 40px;
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--light), var(--gray-300));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--gray-500);
    margin-top: 2px;
}

/* 浮动卡片装饰 */
.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    min-height: 400px;
}

.floating-cards {
    position: relative;
    width: 320px;
    height: 320px;
}

.float-card {
    position: absolute;
    width: 80px;
    height: 80px;
    border-radius: 20px;
    background: var(--glass);
    border: 1px solid var(--border-glass);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--accent);
    animation: float 6s ease-in-out infinite;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.float-card i {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.card-1 { top: 0; left: 20%; animation-delay: 0s; }
.card-2 { top: 25%; right: 0; animation-delay: 1.5s; }
.card-3 { bottom: 10%; left: 10%; animation-delay: 3s; }
.card-4 { bottom: 30%; right: 15%; animation-delay: 4.5s; }

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(5deg); }
}

/* ===== 通用Section ===== */
section {
    padding: 80px 0;
    border-bottom: 1px solid var(--border-glass);
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-header h2 {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.section-header p {
    color: var(--gray-400);
    font-size: 1.05rem;
}

/* ===== 分类筛选 ===== */
.category-filters {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    margin-bottom: 20px;
}

.category-btn {
    padding: 10px 24px;
    border-radius: 60px;
    border: 1px solid var(--border-glass);
    background: var(--glass);
    color: var(--gray-300);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    backdrop-filter: blur(4px);
}

.category-btn:hover {
    background: rgba(99, 102, 241, 0.15);
    border-color: var(--primary);
    color: var(--light);
    transform: translateY(-2px);
}

.category-btn.active {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-color: transparent;
    color: #fff;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}

/* ===== 工具卡片网格 ===== */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.tool-card {
    background: var(--card-bg);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius);
    padding: 24px;
    transition: var(--transition);
    position: relative;
    backdrop-filter: blur(8px);
    display: flex;
    flex-direction: column;
}

.tool-card:hover {
    transform: translateY(-6px);
    border-color: rgba(99, 102, 241, 0.3);
    box-shadow: 0 12px 40px rgba(99, 102, 241, 0.15);
}

.tool-card-header {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 16px;
}

.tool-icon {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    background: var(--glass);
    border: 1px solid var(--border-glass);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    flex-shrink: 0;
    overflow: hidden;
}

.tool-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.tool-icon i {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tool-title-area {
    flex: 1;
    min-width: 0;
}

.tool-title-area h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.tool-category-badge {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 500;
    padding: 3px 12px;
    border-radius: 60px;
    background: rgba(99, 102, 241, 0.2);
    color: var(--primary);
    border: 1px solid rgba(99, 102, 241, 0.2);
}

.tool-card p {
    color: var(--gray-400);
    font-size: 0.9rem;
    line-height: 1.5;
    flex: 1;
    margin-bottom: 20px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.tool-card-actions {
    display: flex;
    gap: 10px;
    margin-top: auto;
}

.tool-link {
    flex: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 16px;
    border-radius: 60px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    font-weight: 600;
    font-size: 0.85rem;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.tool-link:hover {
    transform: scale(1.02);
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
    color: #fff;
}

.delete-btn {
    width: 42px;
    height: 42px;
    border-radius: 60px;
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: #ef4444;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
}

.delete-btn:hover {
    background: rgba(239, 68, 68, 0.25);
    transform: scale(1.05);
}

/* ===== 空状态 ===== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--gray-500);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.4rem;
    color: var(--gray-300);
    margin-bottom: 8px;
}

/* ===== 提交表单 ===== */
.add-form-card {
    max-width: 680px;
    margin: 0 auto;
    background: var(--card-bg);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius);
    padding: 40px;
    backdrop-filter: blur(8px);
}

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

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--gray-300);
}

.required {
    color: #ef4444;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-glass);
    background: var(--glass);
    color: var(--light);
    font-family: inherit;
    font-size: 0.95rem;
    outline: none;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.form-group textarea {
    resize: vertical;
}

.form-group select option {
    background: var(--dark);
    color: var(--light);
}

.btn-primary {
    width: 100%;
    padding: 14px 28px;
    border-radius: 60px;
    border: none;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.btn-primary:hover {
    transform: scale(1.02);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.4);
}

.form-message {
    margin-top: 16px;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    display: none;
}

.form-message.success {
    display: block;
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid rgba(16, 185, 129, 0.2);
    color: #34d399;
}

.form-message.error {
    display: block;
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: #ef4444;
}

/* ===== 弹窗 ===== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-card {
    background: var(--dark);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius);
    padding: 32px;
    max-width: 420px;
    width: 100%;
    box-shadow: var(--shadow);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.modal-header h3 {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #ef4444;
}

.modal-close {
    background: none;
    border: none;
    color: var(--gray-500);
    font-size: 1.8rem;
    cursor: pointer;
    transition: var(--transition);
    line-height: 1;
}

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

.modal-card p {
    color: var(--gray-400);
    margin-bottom: 24px;
}

.modal-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

.btn-secondary {
    padding: 10px 24px;
    border-radius: 60px;
    border: 1px solid var(--border-glass);
    background: var(--glass);
    color: var(--gray-300);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--light);
}

.btn-danger {
    padding: 10px 24px;
    border-radius: 60px;
    border: none;
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: #fff;
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-danger:hover {
    transform: scale(1.02);
    box-shadow: 0 4px 20px rgba(239, 68, 68, 0.4);
}

/* ===== 页脚 ===== */
footer {
    padding: 40px 0;
    border-top: 1px solid var(--border-glass);
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.3rem;
    font-weight: 700;
}

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

.footer-content p {
    color: var(--gray-500);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--gray-400);
    font-size: 0.9rem;
}

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

.copyright {
    font-size: 0.8rem !important;
    color: var(--gray-600) !important;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .hero-content {
        flex-direction: column;
        text-align: center;
    }
    .hero-text {
        max-width: 100%;
    }
    .hero-text p {
        margin: 0 auto 36px;
    }
    .hero-search {
        margin: 0 auto 40px;
    }
    .hero-stats {
        justify-content: center;
    }
    .hero-visual {
        min-height: 280px;
    }
    .floating-cards {
        width: 240px;
        height: 240px;
    }
    .float-card {
        width: 64px;
        height: 64px;
        font-size: 1.5rem;
    }
    .hero-text h1 {
        font-size: 2.8rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        flex-direction: column;
        background: rgba(2, 6, 23, 0.98);
        backdrop-filter: blur(20px);
        padding: 24px 0;
        gap: 16px;
        clip-path: polygon(0 0, 100% 0, 100% 0, 0 0);
        transition: clip-path 0.4s ease;
        border-bottom: 1px solid var(--border-glass);
    }
    .nav-links.open {
        clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
    }
    .hamburger {
        display: block;
    }
    .hero-text h1 {
        font-size: 2.2rem;
    }
    .hero-stats {
        gap: 24px;
        flex-wrap: wrap;
    }
    .stat-number {
        font-size: 1.6rem;
    }
    .tools-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    }
    .form-row {
        grid-template-columns: 1fr;
    }
    .add-form-card {
        padding: 24px;
    }
    .section-header h2 {
        font-size: 1.8rem;
    }
    #hero {
        padding-top: 60px;
    }
    section {
        padding: 60px 0;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    .hero-text h1 {
        font-size: 1.8rem;
    }
    .hero-search input {
        padding: 14px 16px 14px 46px;
        font-size: 0.9rem;
    }
    .tools-grid {
        grid-template-columns: 1fr;
    }
    .tool-card {
        padding: 18px;
    }
    .category-btn {
        padding: 8px 16px;
        font-size: 0.8rem;
    }
    .floating-cards {
        width: 180px;
        height: 180px;
    }
    .float-card {
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
        border-radius: 14px;
    }
}