/* ============================================
   TUPDI 城市更新工具箱 - Landing Page
   ============================================ */

:root {
    --bg: #0a0f1a;
    --bg-card: rgba(13,19,33,0.7);
    --bg-card-hover: rgba(20,30,55,0.85);
    --text: #e8ecf1;
    --text-secondary: #8b9bb4;
    --text-muted: #5a6a82;
    --accent: #00d4ff;
    --accent-dim: rgba(0,212,255,0.1);
    --border: rgba(0,212,255,0.12);
    --border-hover: rgba(0,212,255,0.25);
    --font: 'Inter','Noto Sans SC',-apple-system,sans-serif;
    --radius: 16px;
    --transition: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
    cursor: default;
}

/* ===== 光标跟随发光 ===== */
#cursor-glow {
    position: fixed;
    width: 300px; height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0,212,255,0.08) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
    transform: translate(-50%, -50%);
    transition: opacity 0.3s;
    opacity: 0;
}
body:hover #cursor-glow { opacity: 1; }

/* ===== 背景网格 ===== */
.bg-grid {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background-image: 
        linear-gradient(rgba(0,212,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,212,255,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

/* ===== 主容器 ===== */
.landing-main {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 24px;
    gap: 48px;
}

/* ===== 标题区 ===== */
.landing-hero {
    text-align: center;
    animation: fadeInUp 0.8s ease forwards;
    opacity: 0;
}
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.hero-badge {
    display: inline-block;
    font-size: 13px;
    color: var(--accent);
    border: 1px solid var(--border);
    padding: 6px 16px;
    border-radius: 20px;
    margin-bottom: 20px;
    letter-spacing: 2px;
    background: var(--accent-dim);
}

.hero-title {
    font-size: 42px;
    font-weight: 800;
    letter-spacing: 4px;
    margin-bottom: 8px;
    background: linear-gradient(135deg, #fff 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-sub {
    font-size: 14px;
    color: var(--text-secondary);
    letter-spacing: 6px;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.hero-line {
    width: 60px;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    margin: 0 auto 16px;
}

.hero-desc {
    font-size: 13px;
    color: var(--text-muted);
    letter-spacing: 1px;
}

/* ===== 工具网格 ===== */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    max-width: 720px;
    width: 100%;
    perspective: 1000px;
}

/* ===== 工具卡片 ===== */
.tool-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 28px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    overflow: hidden;
    transition: all var(--transition);
    transform-style: preserve-3d;
    animation: cardIn 0.6s ease forwards;
    opacity: 0;
}
.tool-card:nth-child(1) { animation-delay: 0.1s; }
.tool-card:nth-child(2) { animation-delay: 0.2s; }
.tool-card:nth-child(3) { animation-delay: 0.3s; }
.tool-card:nth-child(4) { animation-delay: 0.4s; }

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

.tool-card:not(.disabled):hover {
    border-color: var(--border-hover);
    background: var(--bg-card-hover);
    transform: translateY(-6px) scale(1.02);
    box-shadow: 0 20px 40px rgba(0,0,0,0.4), 0 0 0 1px rgba(0,212,255,0.15);
}

.tool-card.disabled {
    cursor: not-allowed;
    opacity: 0.5;
}
.tool-card.disabled:hover {
    border-color: var(--border);
    transform: none;
}

/* 卡片发光层 */
.card-glow {
    position: absolute;
    inset: 0;
    border-radius: var(--radius);
    opacity: 0;
    transition: opacity 0.4s;
    background: radial-gradient(
        600px circle at var(--mouse-x, 50%) var(--mouse-y, 50%),
        rgba(0,212,255,0.08),
        transparent 40%
    );
    pointer-events: none;
}
.tool-card:not(.disabled):hover .card-glow {
    opacity: 1;
}

/* 卡片内容 */
.card-icon {
    font-size: 36px;
    line-height: 1;
    transition: transform 0.3s;
}
.tool-card:not(.disabled):hover .card-icon {
    transform: scale(1.15) rotate(-5deg);
}

.card-content h3 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--text);
}

.card-content p {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.card-arrow {
    position: absolute;
    right: 24px;
    bottom: 28px;
    font-size: 20px;
    color: var(--accent);
    opacity: 0;
    transform: translateX(-10px);
    transition: all 0.3s;
}
.tool-card:not(.disabled):hover .card-arrow {
    opacity: 1;
    transform: translateX(0);
}

.card-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    font-size: 10px;
    color: var(--text-muted);
    border: 1px solid var(--border);
    padding: 3px 10px;
    border-radius: 12px;
    letter-spacing: 1px;
}

/* ===== 底部 ===== */
.landing-footer {
    text-align: center;
    font-size: 11px;
    color: var(--text-muted);
    letter-spacing: 0.5px;
    animation: fadeInUp 0.8s ease 0.5s forwards;
    opacity: 0;
}

/* ===== 响应式 ===== */
@media (max-width: 640px) {
    .tools-grid { grid-template-columns: 1fr; }
    .hero-title { font-size: 28px; letter-spacing: 2px; }
    .hero-sub { font-size: 12px; letter-spacing: 3px; }
    .landing-main { padding: 40px 20px; gap: 36px; }
}