/* HaoQingAi Home Page - V3 Modern Redesign */
/* Design: Clean, professional, gradient accents, smooth animations */

:root {
    --bg-body: #f0f2f8;
    --bg-card: #ffffff;
    --bg-card-alt: rgba(255,255,255,0.85);
    --border-color: #e2e8f0;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-dim: #94a3b8;
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-cyan: #06b6d4;
    --accent-pink: #ec4899;
    --accent-green: #10b981;
    --gradient-primary: linear-gradient(135deg, #6366f1, #8b5cf6);
    --gradient-hero: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
    --gradient-cta: linear-gradient(135deg, #6366f1, #8b5cf6);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.03);
    --shadow-md: 0 4px 16px rgba(99,102,241,0.08), 0 2px 6px rgba(0,0,0,0.04);
    --shadow-lg: 0 12px 40px rgba(99,102,241,0.12), 0 4px 12px rgba(0,0,0,0.06);
    --shadow-cta: 0 8px 24px rgba(99,102,241,0.35);
    --radius: 16px;
    --radius-md: 12px;
    --radius-sm: 8px;
    --radius-pill: 50px;
    --nav-bg: rgba(255,255,255,0.8);
    --nav-border: rgba(226,232,240,0.8);
    --glow-color: rgba(99,102,241,0.08);
}

[data-theme="dark"] {
    --bg-body: #0a0a1a;
    --bg-card: #161628;
    --bg-card-alt: rgba(22,22,40,0.85);
    --border-color: #1e2044;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-dim: #64748b;
    --accent-primary: #818cf8;
    --accent-secondary: #a78bfa;
    --accent-cyan: #22d3ee;
    --accent-pink: #f472b6;
    --accent-green: #34d399;
    --gradient-primary: linear-gradient(135deg, #818cf8, #a78bfa);
    --gradient-hero: linear-gradient(135deg, #818cf8 0%, #a78bfa 50%, #f472b6 100%);
    --gradient-cta: linear-gradient(135deg, #818cf8, #a78bfa);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.2);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.3);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.4);
    --shadow-cta: 0 8px 24px rgba(129,140,248,0.3);
    --nav-bg: rgba(10,10,26,0.85);
    --nav-border: rgba(30,32,68,0.8);
    --glow-color: rgba(129,140,248,0.06);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: transparent;
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* ===== 主题切换按钮 ===== */
.theme-toggle {
    position: fixed;
    top: 16px;
    right: 20px;
    z-index: 100;
    background: var(--bg-card);
    border: 1.5px solid var(--border-color);
    color: var(--text-dim);
    width: 38px; height: 38px;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer;
    font-size: 16px;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}
.theme-toggle:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    transform: rotate(15deg);
}

/* ===== 容器 ===== */
.home-container {
    max-width: 960px;
    width: 100%;
    margin: 0 auto;
    padding: 24px 24px 40px;
    position: relative;
    z-index: 1;
}

/* ===== Hero ===== */
.hero {
    text-align: center;
    padding: 60px 0 56px;
    position: relative;
}

.hero-glow {
    position: absolute;
    top: 20%;
    left: 50%;
    transform: translateX(-50%);
    width: 500px;
    height: 300px;
    background: radial-gradient(ellipse, var(--glow-color) 0%, transparent 70%);
    pointer-events: none;
    z-index: -1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8em;
    font-weight: 600;
    padding: 6px 16px;
    border-radius: var(--radius-pill);
    margin-bottom: 24px;
    background: var(--bg-card);
    color: var(--accent-primary);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    letter-spacing: 0.02em;
}

.badge-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--accent-green);
    animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(0.85); }
}

.hero-title {
    font-size: 3.5em;
    font-weight: 800;
    background: var(--gradient-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.3em;
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-weight: 500;
}

.hero-desc {
    font-size: 0.95em;
    color: var(--text-dim);
    max-width: 480px;
    margin: 0 auto 32px;
    line-height: 1.8;
}

.hero-cta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    background: var(--gradient-cta);
    color: #ffffff;
    font-size: 1em;
    font-weight: 600;
    border-radius: var(--radius-sm);
    text-decoration: none;
    box-shadow: var(--shadow-cta);
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}
.hero-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(99,102,241,0.4);
}
.hero-cta:active {
    transform: translateY(0);
}
.hero-cta .icon-svg {
    transition: transform 0.2s;
}
.hero-cta:hover .icon-svg {
    transform: translateX(3px);
}

/* ===== 功能卡片 ===== */
.features {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 48px;
}

.feature-item {
    text-align: center;
    padding: 28px 16px 24px;
    border-radius: var(--radius);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
}
.feature-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-primary);
}

.feature-icon-wrap {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 14px;
    color: #ffffff;
}
.feature-icon-wrap .icon-svg {
    color: #ffffff;
}

.gradient-blue { background: linear-gradient(135deg, #6366f1, #818cf8); }
.gradient-purple { background: linear-gradient(135deg, #8b5cf6, #a78bfa); }
.gradient-pink { background: linear-gradient(135deg, #ec4899, #f472b6); }
.gradient-cyan { background: linear-gradient(135deg, #06b6d4, #22d3ee); }

.feature-item h4 {
    font-size: 0.95em;
    margin-bottom: 8px;
    font-weight: 700;
    color: var(--text-primary);
}
.feature-item p {
    font-size: 0.8em;
    color: var(--text-dim);
    line-height: 1.7;
}

/* ===== 工作流程 ===== */
.section-title {
    text-align: center;
    font-size: 1.05em;
    font-weight: 700;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.workflow {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 32px 24px;
    margin-bottom: 48px;
    box-shadow: var(--shadow-sm);
}

.workflow-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
}

.wf-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 12px 14px;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
    min-width: 72px;
    cursor: default;
}
.wf-step:hover {
    background: var(--glow-color);
}

.wf-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--glow-color);
    color: var(--accent-primary);
    transition: all 0.2s;
}
.wf-step:hover .wf-icon {
    background: var(--gradient-primary);
    color: #ffffff;
}
.wf-step:hover .wf-icon .icon-svg {
    color: #ffffff;
}

.wf-step span {
    font-size: 0.78em;
    color: var(--text-dim);
    font-weight: 500;
}

.wf-connector {
    display: flex;
    align-items: center;
    padding: 0 4px;
}
.connector-line {
    width: 24px;
    height: 2px;
    background: var(--border-color);
    border-radius: 1px;
    position: relative;
}
.connector-line::after {
    content: '';
    position: absolute;
    right: -2px;
    top: -3px;
    width: 0;
    height: 0;
    border-left: 5px solid var(--border-color);
    border-top: 4px solid transparent;
    border-bottom: 4px solid transparent;
}

/* ===== Footer ===== */
.home-footer {
    text-align: center;
    color: var(--text-dim);
    font-size: 0.82em;
    padding-top: 8px;
}
.home-footer a.footer-link {
    color: var(--accent-primary);
    text-decoration: none;
    font-size: 0.95em;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-weight: 600;
    transition: opacity 0.2s;
}
.home-footer a.footer-link:hover {
    opacity: 0.8;
    text-decoration: underline;
}
.home-footer p + p {
    margin-top: 8px;
}

/* ===== Loading Spinner ===== */
.loading-spinner {
    width: 44px;
    height: 44px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
    .badge-dot { animation: none; }
    .loading-spinner { animation-duration: 1.5s; }
    .feature-item, .hero-cta, .wf-step, .theme-toggle {
        transition: none;
    }
    .hero-cta:hover .icon-svg { transform: none; }
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .home-container { padding: 16px 16px 32px; }
    .hero { padding: 40px 0 40px; }
    .hero-title { font-size: 2.5em; }
    .hero-subtitle { font-size: 1.1em; }
    .hero-desc { font-size: 0.88em; }
    .features { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .workflow-steps { flex-wrap: wrap; gap: 4px; justify-content: center; }
    .wf-connector { display: none; }
    .wf-step { min-width: 64px; padding: 10px 10px; }
}

@media (max-width: 480px) {
    .top-nav { top: 8px; left: 8px; right: 8px; padding: 8px 14px; }
    .hero-title { font-size: 2em; }
    .features { grid-template-columns: 1fr 1fr; gap: 10px; }
    .feature-item { padding: 20px 12px 18px; }
    .feature-icon-wrap { width: 44px; height: 44px; }
    .workflow { padding: 24px 16px; }
}