/* ========================================
   AI 提示词生成器站 - 样式表
   主题色：科技蓝 + 紫色渐变
   ======================================== */

/* --- CSS 变量 --- */
:root {
    --primary: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4338ca;
    --secondary: #a855f7;
    --accent: #06b6d4;
    --dark: #0f172a;
    --gray-900: #1e293b;
    --gray-800: #334155;
    --gray-600: #64748b;
    --gray-400: #94a3b8;
    --gray-200: #e2e8f0;
    --gray-100: #f1f5f9;
    --white: #ffffff;
    --gradient-primary: linear-gradient(135deg, var(--primary), var(--secondary));
    --shadow: 0 4px 20px rgba(99,102,241,0.15);
    --shadow-hover: 0 8px 30px rgba(99,102,241,0.25);
    --radius: 16px;
    --radius-sm: 10px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--gray-900);
    background: var(--gray-100);
    line-height: 1.8;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.3s;
}

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

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

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

/* --- 导航栏 --- */
.navbar {
    background: rgba(15,23,42,0.95);
    backdrop-filter: blur(10px);
    padding: 0.8rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--white) !important;
    font-size: 1.2rem;
    font-weight: 700;
    text-decoration: none;
}

.logo-icon {
    font-size: 1.5rem;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 0.2rem;
}

.nav-links a {
    color: rgba(255,255,255,0.85);
    padding: 0.5rem 0.9rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s;
}

.nav-links a:hover,
.nav-links a.active {
    background: rgba(99,102,241,0.3);
    color: var(--white);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
}

/* --- Hero 区域 --- */
.hero {
    background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #312e81 100%);
    color: white;
    padding: 4rem 0 6rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, rgba(99,102,241,0.2) 0%, transparent 50%),
                radial-gradient(circle at 70% 50%, rgba(168,85,247,0.2) 0%, transparent 50%);
    animation: heroFloat 15s ease-in-out infinite;
}

@keyframes heroFloat {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

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

.hero-badge {
    display: inline-block;
    background: rgba(99,102,241,0.3);
    border: 1px solid rgba(129,140,248,0.5);
    padding: 0.3rem 1rem;
    border-radius: 50px;
    font-size: 0.85rem;
    margin-bottom: 1.5rem;
    color: rgba(255,255,255,0.9);
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #c7d2fe, #e9d5ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.1rem;
    opacity: 0.85;
    max-width: 600px;
    margin: 0 auto 2rem;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 0.85rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s;
    cursor: pointer;
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white) !important;
    box-shadow: 0 4px 15px rgba(99,102,241,0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99,102,241,0.5);
}

.btn-secondary {
    background: rgba(255,255,255,0.1);
    color: var(--white) !important;
    border: 2px solid rgba(255,255,255,0.3);
}

.btn-secondary:hover {
    background: rgba(255,255,255,0.2);
}

.hero-wave {
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
}

.hero-wave svg {
    display: block;
    width: 100%;
    height: 80px;
}

/* --- 提示词生成器区域 --- */
.generator-section {
    padding: 4rem 0;
    background: var(--gray-100);
}

.section-title {
    text-align: center;
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--gray-900);
}

.section-desc {
    text-align: center;
    color: var(--gray-600);
    margin-bottom: 2.5rem;
    font-size: 1rem;
}

.generator-card {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.generator-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: 500px;
}

/* 表单样式 */
.generator-form {
    padding: 2rem;
    background: linear-gradient(135deg, #f8fafc, #eef2ff);
    border-right: 1px solid var(--gray-200);
}

.form-group {
    margin-bottom: 1.2rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.4rem;
    color: var(--gray-800);
    font-size: 0.9rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.7rem 1rem;
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    transition: border-color 0.3s;
    font-family: inherit;
}

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

.btn-generate {
    width: 100%;
    padding: 0.9rem;
    font-size: 1.05rem;
    margin-top: 0.5rem;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s;
}

.btn-generate:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99,102,241,0.4);
}

/* 结果区域 */
.generator-result {
    padding: 2rem;
    display: flex;
    flex-direction: column;
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.result-header h3 {
    font-size: 1.1rem;
    color: var(--gray-800);
}

.btn-copy {
    padding: 0.4rem 1rem;
    background: var(--gray-100);
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.3s;
}

.btn-copy:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.result-eng {
    flex: 1;
    margin-bottom: 1rem;
}

#promptOutput {
    width: 100%;
    height: 100%;
    min-height: 300px;
    padding: 1rem;
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius-sm);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    resize: vertical;
    background: #f8fafc;
}

.result-tips {
    background: #eff6ff;
    border-left: 4px solid var(--primary);
    padding: 1rem 1.2rem;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-size: 0.85rem;
    color: var(--gray-800);
}

.result-tips ul {
    margin: 0.5rem 0 0 1.2rem;
}

.result-tips li {
    margin-bottom: 0.3rem;
}

/* --- 功能特点 --- */
.features-section {
    padding: 4rem 0;
    background: var(--white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    background: var(--gray-100);
    border-radius: var(--radius);
    padding: 2rem;
    text-align: center;
    transition: all 0.3s;
    border: 1.5px solid transparent;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
    border-color: rgba(99,102,241,0.3);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.15rem;
    margin-bottom: 0.5rem;
    color: var(--gray-800);
}

.feature-card p {
    color: var(--gray-600);
    font-size: 0.9rem;
}

/* --- 使用场景 --- */
.scenarios-section {
    padding: 4rem 0;
    background: var(--gray-100);
}

.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
}

.scenario-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 1.8rem;
    box-shadow: var(--shadow);
    transition: all 0.3s;
    border-top: 4px solid var(--primary);
}

.scenario-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

.scenario-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--gray-800);
}

.scenario-card p {
    color: var(--gray-600);
    font-size: 0.9rem;
}

/* --- 文章列表 --- */
.articles-section {
    padding: 4rem 0;
    background: var(--gray-100);
}

.article-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.article-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 1.8rem;
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

.article-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

.article-meta {
    display: flex;
    gap: 0.8rem;
    margin-bottom: 0.8rem;
    font-size: 0.85rem;
}

.article-category {
    background: #eef2ff;
    color: var(--primary-dark);
    padding: 0.2rem 0.7rem;
    border-radius: 20px;
    font-weight: 600;
}

.article-date {
    color: var(--gray-600);
}

.article-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    line-height: 1.5;
}

.article-card h3 a {
    color: var(--gray-900);
}

.article-card p {
    color: var(--gray-600);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.read-more {
    font-weight: 600;
    font-size: 0.9rem;
}

/* --- 页脚 --- */
.footer {
    background: var(--dark);
    color: rgba(255,255,255,0.85);
    padding: 3rem 0 1.5rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer h3 {
    color: var(--white);
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

.footer h4 {
    color: rgba(255,255,255,0.9);
    font-size: 1rem;
    margin-bottom: 0.8rem;
}

.footer p {
    font-size: 0.9rem;
    line-height: 1.7;
    opacity: 0.8;
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: 0.5rem;
}

.footer-col ul li a {
    color: rgba(255,255,255,0.7);
    font-size: 0.9rem;
    transition: color 0.3s;
}

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

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.15);
    padding-top: 1.5rem;
    text-align: center;
    font-size: 0.85rem;
    opacity: 0.6;
}

/* ========================================
   文章页通用样式
   ======================================== */
.article-hero {
    background: linear-gradient(135deg, #0f172a, #312e81);
    color: white;
    padding: 3rem 0;
    text-align: center;
}

.article-hero h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.article-meta {
    justify-content: center;
    display: flex;
    gap: 1rem;
    opacity: 0.85;
    font-size: 0.9rem;
}

.article-body {
    max-width: 750px;
    margin: 3rem auto;
    padding: 0 1.5rem;
    font-size: 1.05rem;
    line-height: 2;
}

.article-body h2 {
    color: var(--primary-dark);
    font-size: 1.5rem;
    margin: 2.5rem 0 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-light);
}

.article-body h3 {
    color: var(--primary);
    font-size: 1.2rem;
    margin: 2rem 0 0.8rem;
}

.article-body p {
    margin-bottom: 1.2rem;
}

.article-body ul,
.article-body ol {
    margin: 1rem 0 1.5rem 1.5rem;
}

.article-body li {
    margin-bottom: 0.5rem;
}

.article-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    font-size: 0.95rem;
}

.article-body th,
.article-body td {
    border: 1px solid var(--gray-200);
    padding: 0.7rem 1rem;
    text-align: left;
}

.article-body th {
    background: var(--primary);
    color: white;
}

.article-body tr:nth-child(even) {
    background: var(--gray-100);
}

.tip-box {
    background: #eff6ff;
    border-left: 4px solid var(--primary);
    padding: 1rem 1.5rem;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin: 1.5rem 0;
}

.tip-box strong {
    color: var(--primary-dark);
}

.warning-box {
    background: #fffbeb;
    border-left: 4px solid #f59e0b;
    padding: 1rem 1.5rem;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin: 1.5rem 0;
}

.code-block {
    background: var(--dark);
    color: #e2e8f0;
    padding: 1rem 1.5rem;
    border-radius: var(--radius-sm);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    overflow-x: auto;
    margin: 1.5rem 0;
    line-height: 1.6;
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 768px) {
    .mobile-menu-btn {
        display: block;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--dark);
        flex-direction: column;
        padding: 1rem;
        box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    }

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

    .hero h1 {
        font-size: 1.8rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

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

    .generator-form {
        border-right: none;
        border-bottom: 1px solid var(--gray-200);
    }

    .features-grid,
    .scenarios-grid,
    .article-list {
        grid-template-columns: 1fr;
    }

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

    .article-hero h1 {
        font-size: 1.5rem;
    }

    .article-body {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        text-align: center;
    }
}