/* ================================================================
   projects.css — 项目详情页共享样式
   统一 project_1~4.html，去除 AI 模板感
   ================================================================ */

/* ===== CSS Variables ===== */
:root {
    --proj-font-display: 'Playfair Display', Georgia, serif;
    --proj-font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --proj-font-mono: 'JetBrains Mono', 'SF Mono', monospace;
    --proj-text: #1a2332;
    --proj-text-secondary: #5a6d80;
    --proj-text-muted: #8b97a5;
    --proj-accent: #0ea5e9;
    --proj-accent-hover: #0284c7;
    --proj-border: #e8edf2;
    --proj-bg-soft: #faf9f6;
    --proj-radius: 12px;
    --proj-radius-lg: 20px;
    --proj-shadow-sm: 0 1px 3px rgba(26, 35, 50, 0.04);
    --proj-shadow-md: 0 4px 16px rgba(26, 35, 50, 0.06);
    --proj-shadow-lg: 0 12px 32px rgba(26, 35, 50, 0.08);
}

/* ===== Base Reset ===== */
* {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--proj-font-body);
    background-color: var(--proj-bg-soft);
}

/* ===== Header ===== */
.enhanced-header {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--proj-border);
}

/* ===== Hero ===== */
.hero-title {
    font-family: var(--proj-font-display);
    font-weight: 700;
    font-size: clamp(2.25rem, 5vw, 3.5rem);
    line-height: 1.15;
    letter-spacing: -0.015em;
    color: var(--proj-text);
}

.hero-subtitle {
    font-family: var(--proj-font-body);
    font-weight: 400;
    font-size: clamp(1.05rem, 2.5vw, 1.2rem);
    line-height: 1.7;
    color: var(--proj-text-secondary);
    max-width: 65ch;
    margin: 0 auto;
}

/* ===== Tags ===== */
.enhanced-tag {
    display: inline-flex;
    align-items: center;
    padding: 5px 14px;
    background: #fff;
    border: 1px solid var(--proj-border);
    border-radius: 20px;
    font-family: var(--proj-font-body);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--proj-text-secondary);
    letter-spacing: 0.02em;
    transition:
        border-color 0.2s,
        color 0.2s;
}

.enhanced-tag:hover {
    border-color: var(--proj-accent);
    color: var(--proj-accent);
}

/* ===== Section Cards ===== */
.enhanced-section {
    background: #fff;
    border-radius: var(--proj-radius-lg);
    border: 1px solid var(--proj-border);
    padding: 2rem;
    margin-bottom: 1.5rem;
    position: relative;
}

.enhanced-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 1.5rem;
    right: 1.5rem;
    height: 2px;
    background: var(--proj-accent);
    transform: scaleX(0.3);
    transition: transform 0.35s ease;
}

.enhanced-section:hover::before {
    transform: scaleX(1);
}

/* ===== Inner Cards ===== */
.enhanced-card {
    background: var(--proj-bg-soft);
    border: 1px solid var(--proj-border);
    border-radius: var(--proj-radius);
    padding: 1.5rem;
    margin-bottom: 1rem;
    transition:
        border-color 0.2s,
        box-shadow 0.2s;
}

.enhanced-card:hover {
    border-color: var(--proj-accent);
    box-shadow: var(--proj-shadow-md);
}

/* ===== Button ===== */
.enhanced-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    background: var(--proj-accent);
    color: #fff;
    border: none;
    border-radius: var(--proj-radius);
    font-family: var(--proj-font-body);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition:
        background 0.2s,
        box-shadow 0.2s;
    box-shadow: 0 2px 8px rgba(14, 165, 233, 0.2);
    text-decoration: none;
}

.enhanced-button:hover {
    background: var(--proj-accent-hover);
    box-shadow: 0 4px 16px rgba(14, 165, 233, 0.3);
}

.enhanced-button:active {
    background: #0369a1;
}

.enhanced-button:focus-visible {
    outline: 2px solid var(--proj-accent);
    outline-offset: 2px;
}

/* ===== Path Navigation ===== */
.enhanced-path {
    background: #fff;
    border-radius: var(--proj-radius-lg);
    border: 1px solid var(--proj-border);
    padding: 2rem;
}

.path-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    padding: 1rem 1.2rem;
    background: #fff;
    border-radius: var(--proj-radius);
    border: 1px solid var(--proj-border);
    transition:
        border-color 0.2s,
        box-shadow 0.2s;
    min-width: 110px;
    cursor: pointer;
}

.path-link:hover {
    border-color: var(--proj-accent);
    box-shadow: var(--proj-shadow-sm);
}

.current-path {
    border-color: var(--proj-accent);
    box-shadow: 0 0 0 2px rgba(14, 165, 233, 0.12);
}

/* ===== Path Icons ===== */
.step-icon {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--proj-bg-soft);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--proj-border);
    margin-bottom: 0.5rem;
    transition: border-color 0.2s;
}

.path-link:hover .step-icon {
    border-color: var(--proj-accent);
}

.current-icon {
    background: var(--proj-accent);
    border-color: var(--proj-accent);
    color: #fff;
}

/* ===== Evolution Path ===== */
.evolution-path-compact {
    background: #fff;
    border-radius: var(--proj-radius-lg);
    border: 1px solid var(--proj-border);
    padding: 2rem;
}

.path-title {
    font-family: var(--proj-font-display);
    color: var(--proj-text);
    font-size: 1.5rem;
    font-weight: 700;
}

.path-subtitle {
    font-family: var(--proj-font-body);
    color: var(--proj-text-secondary);
    font-size: 0.95rem;
}

.path-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin: 1.5rem 0;
}

/* ===== Motion ===== */
.fadeInUp {
    animation: fadeInUp 0.6s ease-out both;
}

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

.stagger-animation > * {
    animation: fadeInUp 0.5s ease-out both;
}
.stagger-animation > *:nth-child(1) {
    animation-delay: 0.05s;
}
.stagger-animation > *:nth-child(2) {
    animation-delay: 0.15s;
}
.stagger-animation > *:nth-child(3) {
    animation-delay: 0.25s;
}
.stagger-animation > *:nth-child(4) {
    animation-delay: 0.35s;
}

/* ===== Section Divider ===== */
.section-divider {
    height: 1px;
    background: var(--proj-border);
    margin: 2rem 0;
}

/* ===== Code/Data ===== */
code,
pre {
    font-family: var(--proj-font-mono);
    font-size: 0.85rem;
    background: var(--proj-bg-soft);
    padding: 2px 6px;
    border-radius: 4px;
    color: var(--proj-text);
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
    .fadeInUp,
    .stagger-animation > *,
    .path-step {
        animation: none;
    }
    .enhanced-section,
    .enhanced-card {
        transition: none;
    }
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .hero-title {
        font-size: clamp(1.75rem, 8vw, 2.25rem);
    }
    .hero-subtitle {
        font-size: 0.95rem;
    }
    .enhanced-section {
        padding: 1.25rem;
    }
    .enhanced-card {
        padding: 1rem;
    }
    .path-flow {
        flex-direction: column;
        align-items: stretch;
    }
    .step-icon {
        width: 36px;
        height: 36px;
    }
}