/* ===== 全局重置与基础 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #8b5cf6;
    --accent: #06b6d4;
    --bg: #f8fafc;
    --card-bg: #ffffff;
    --text: #1e293b;
    --text-light: #64748b;
    --border: #e2e8f0;
    --shadow: 0 4px 24px rgba(0,0,0,0.06);
    --shadow-hover: 0 12px 40px rgba(99,102,241,0.15);
    --radius: 16px;
    --radius-sm: 10px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: var(--transition);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 1px 12px rgba(0,0,0,0.06);
    padding: 10px 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text);
}

.logo i {
    color: var(--primary);
    font-size: 1.6rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-links a {
    padding: 8px 18px;
    border-radius: 50px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-light);
    transition: var(--transition);
    position: relative;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
    background: rgba(99,102,241,0.08);
}

.nav-links a.admin-link {
    border: 1.5px solid var(--border);
    color: var(--text-light);
}

.nav-links a.admin-link:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(99,102,241,0.06);
}

.nav-links a.logout-link {
    color: #ef4444;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.hamburger span {
    width: 26px;
    height: 2.5px;
    background: var(--text);
    border-radius: 4px;
    transition: var(--transition);
}

/* ===== Hero 区域 ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #f0f4ff 0%, #e8f0fe 50%, #f5f3ff 100%);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: -30%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(99,102,241,0.08) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

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

.hero-content h1 {
    font-size: 3.2rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
    letter-spacing: -1px;
}

.hero-content p {
    font-size: 1.15rem;
    color: var(--text-light);
    max-width: 550px;
    margin: 0 auto 36px;
}

.hero-search {
    max-width: 480px;
    margin: 0 auto 40px;
    position: relative;
}

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

.hero-search input {
    width: 100%;
    padding: 16px 20px 16px 50px;
    border: 2px solid var(--border);
    border-radius: 60px;
    font-size: 1rem;
    background: var(--card-bg);
    transition: var(--transition);
    outline: none;
    box-shadow: 0 2px 12px rgba(0,0,0,0.04);
}

.hero-search input:focus {
    border-color: var(--primary);
    box-shadow: 0 4px 20px rgba(99,102,241,0.15);
}

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

.stat-item {
    font-size: 0.95rem;
    color: var(--text-light);
}

.stat-item span {
    font-weight: 700;
    color: var(--primary);
    font-size: 1.1rem;
}

/* ===== 工具区域 ===== */
.tools-section {
    padding: 80px 0 100px;
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-header h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
}

.section-header p {
    color: var(--text-light);
    font-size: 1rem;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 24px;
}

.tool-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 32px 24px 24px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.tool-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary);
}

.tool-icon {
    width: 64px;
    height: 64px;
    border-radius: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    margin-bottom: 18px;
    transition: var(--transition);
}

.tool-card:hover .tool-icon {
    transform: scale(1.1);
}

.tool-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text);
}

.tool-card p {
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.5;
    flex: 1;
}

.tool-hover {
    margin-top: 16px;
    opacity: 0;
    transform: translateY(8px);
    transition: var(--transition);
}

.tool-card:hover .tool-hover {
    opacity: 1;
    transform: translateY(0);
}

.tool-hover span {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.tool-hover i {
    font-size: 0.8rem;
    transition: var(--transition);
}

.tool-card:hover .tool-hover i {
    transform: translateX(4px);
}

.no-results {
    display: none;
    flex-direction: column;
    align-items: center;
    padding: 60px 20px;
    color: var(--text-light);
}

.no-results i {
    font-size: 3rem;
    margin-bottom: 16px;
    opacity: 0.5;
}

.no-results.show {
    display: flex;
}

/* ===== 弹窗 ===== */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(4px);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    padding: 20px;
    animation: fadeIn 0.2s ease;
}

.modal-overlay.show {
    display: flex;
}

.modal-content {
    background: var(--card-bg);
    border-radius: var(--radius);
    max-width: 600px;
    width: 100%;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: 0 24px 80px rgba(0,0,0,0.2);
    animation: slideUp 0.3s ease;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 28px 16px;
    border-bottom: 1px solid var(--border);
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.8rem;
    cursor: pointer;
    color: var(--text-light);
    padding: 0 4px;
    line-height: 1;
    transition: var(--transition);
}

.modal-close:hover {
    color: var(--text);
    transform: rotate(90deg);
}

.modal-body {
    padding: 28px;
}

/* 工具内部样式 */
.tool-inner {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.tool-inner label {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text);
}

.tool-inner textarea,
.tool-inner input[type="text"],
.tool-inner input[type="number"],
.tool-inner select {
    width: 100%;
    padding: 12px 14px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-family: inherit;
    transition: var(--transition);
    background: var(--bg);
    resize: vertical;
}

.tool-inner textarea:focus,
.tool-inner input:focus,
.tool-inner select:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(99,102,241,0.1);
}

.tool-inner textarea {
    min-height: 100px;
}

.tool-btn {
    padding: 12px 24px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    align-self: flex-start;
}

.tool-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99,102,241,0.3);
}

.tool-btn:active {
    transform: scale(0.97);
}

.tool-result {
    margin-top: 8px;
    padding: 16px;
    background: var(--bg);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    font-size: 0.95rem;
    word-break: break-all;
    min-height: 50px;
    color: var(--text);
}

.tool-result.success {
    border-color: #10b981;
    background: #ecfdf5;
}

.tool-result.error {
    border-color: #ef4444;
    background: #fef2f2;
}

/* ===== 页脚 ===== */
.footer {
    background: var(--text);
    color: rgba(255,255,255,0.8);
    padding: 40px 0;
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.footer-brand {
    font-size: 1.2rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    color: #fff;
}

.footer-brand i {
    color: var(--primary);
}

/* ===== 登录页面 (后台) ===== */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #f0f4ff, #f5f3ff);
    padding: 20px;
}

.login-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 40px 36px;
    max-width: 400px;
    width: 100%;
    box-shadow: 0 8px 40px rgba(0,0,0,0.08);
    text-align: center;
}

.login-icon {
    font-size: 2.8rem;
    color: var(--primary);
    margin-bottom: 12px;
}

.login-card h2 {
    font-size: 1.5rem;
    margin-bottom: 24px;
    color: var(--text);
}

.login-error {
    background: #fef2f2;
    color: #dc2626;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
    font-size: 0.9rem;
    border: 1px solid #fecaca;
}

.form-group {
    text-align: left;
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text);
}

.form-group label i {
    margin-right: 6px;
    color: var(--text-light);
}

.form-group input {
    width: 100%;
    padding: 12px 14px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    transition: var(--transition);
}

.form-group input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.1);
    outline: none;
}

.btn-login {
    width: 100%;
    padding: 13px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 6px;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99,102,241,0.3);
}

.back-link {
    display: inline-block;
    margin-top: 20px;
    color: var(--text-light);
    font-size: 0.9rem;
    transition: var(--transition);
}

.back-link:hover {
    color: var(--primary);
}

/* ===== 后台管理面板 ===== */
.admin-panel {
    min-height: 100vh;
    background: var(--bg);
}

.admin-header {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
    box-shadow: 0 2px 12px rgba(0,0,0,0.04);
}

.admin-header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.admin-header h1 {
    font-size: 1.3rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}

.admin-header h1 i {
    color: var(--primary);
}

.admin-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.admin-user {
    font-size: 0.9rem;
    color: var(--text-light);
    padding: 6px 12px;
    background: var(--bg);
    border-radius: 50px;
}

.admin-user i {
    margin-right: 4px;
}

.btn-admin {
    padding: 8px 16px;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-admin:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.btn-logout:hover {
    background: #ef4444;
    border-color: #ef4444;
    color: #fff;
}

.admin-main {
    padding: 40px 0;
}

.admin-section h2 {
    font-size: 1.3rem;
    margin-bottom: 6px;
}

.admin-hint {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 24px;
    padding: 12px 16px;
    background: #fef9c3;
    border-radius: var(--radius-sm);
    border: 1px solid #fde68a;
}

.admin-table-wrapper {
    overflow-x: auto;
}

.admin-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.admin-table th,
.admin-table td {
    padding: 14px 18px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    font-size: 0.9rem;
}

.admin-table th {
    background: var(--bg);
    font-weight: 600;
    color: var(--text-light);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.admin-table tr:last-child td {
    border-bottom: none;
}

.admin-table tr:hover td {
    background: #f8faff;
}

.color-badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 50px;
    color: #fff;
    font-size: 0.8rem;
    font-weight: 500;
}

.btn-edit {
    padding: 6px 14px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.85rem;
    transition: var(--transition);
    color: var(--text-light);
}

.btn-edit:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-edit:not(:disabled):hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

/* ===== 动画 ===== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px) scale(0.97); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 16px 20px;
        gap: 6px;
        box-shadow: 0 12px 40px rgba(0,0,0,0.08);
        border-radius: 0 0 var(--radius) var(--radius);
    }

    .nav-links.open {
        display: flex;
    }

    .hamburger {
        display: flex;
    }

    .hero-content h1 {
        font-size: 2.2rem;
    }

    .hero-content p {
        font-size: 1rem;
    }

    .hero-stats {
        gap: 24px;
        flex-wrap: wrap;
    }

    .tools-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
        gap: 16px;
    }

    .admin-header-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .admin-actions {
        width: 100%;
        justify-content: flex-start;
    }

    .modal-content {
        max-height: 90vh;
        border-radius: var(--radius) var(--radius) 0 0;
        margin-top: auto;
    }

    .modal-overlay {
        align-items: flex-end;
        padding: 0;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 1.8rem;
    }

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

    .tool-card {
        padding: 24px 18px;
    }

    .login-card {
        padding: 28px 20px;
    }
}