/* ==============================
 * PicViaI User - Modern UI
 * ============================== */

:root {
    --pv-primary: #6366f1;
    --pv-primary-dark: #4f46e5;
    --pv-primary-light: #818cf8;
    --pv-primary-50: #eef2ff;
    --pv-primary-100: #e0e7ff;
    --pv-text: #1e293b;
    --pv-text-muted: #94a3b8;
    --pv-bg: #f8fafc;
    --pv-border: #e2e8f0;
    --pv-success: #10b981;
    --pv-warning: #f59e0b;
    --pv-danger: #ef4444;
    --pv-radius: 12px;
    --pv-radius-sm: 8px;
    --pv-shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
    --pv-shadow-md: 0 4px 12px rgba(0,0,0,.08);
    --pv-shadow-lg: 0 10px 30px rgba(0,0,0,.10);
    --pv-transition: .2s ease all;
}

* { box-sizing: border-box; }

body {
    font-family: 'Inter', -apple-system, 'Microsoft YaHei', sans-serif;
    background: var(--pv-bg);
    color: var(--pv-text);
    margin: 0;
}

/* ---- Navbar ---- */
.pv-navbar {
    background: #fff;
    border-bottom: 1px solid var(--pv-border);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.pv-navbar-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.pv-navbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.pv-navbar-brand .logo {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--pv-primary), var(--pv-primary-light));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 700;
    font-size: 18px;
}

.pv-navbar-brand span {
    font-size: 18px;
    font-weight: 700;
    color: var(--pv-text);
    letter-spacing: -.3px;
}

.pv-navbar-nav {
    display: flex;
    align-items: center;
    gap: 4px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.pv-navbar-nav a {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: var(--pv-radius-sm);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    color: var(--pv-text-muted);
    transition: var(--pv-transition);
}

.pv-navbar-nav a:hover,
.pv-navbar-nav a.active {
    background: var(--pv-primary-50);
    color: var(--pv-primary);
}

.pv-navbar-nav .btn-login {
    background: var(--pv-primary);
    color: #fff;
    padding: 10px 24px;
}

.pv-navbar-nav .btn-login:hover {
    background: var(--pv-primary-dark);
    box-shadow: 0 4px 12px rgba(99,102,241,.3);
    color: #fff;
}

/* ---- Hero ---- */
.pv-hero {
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 24px 60px;
    text-align: center;
}

.pv-hero h1 {
    font-size: 42px;
    font-weight: 800;
    letter-spacing: -1px;
    margin: 0 0 16px;
    line-height: 1.2;
}

.pv-hero h1 .gradient {
    background: linear-gradient(135deg, var(--pv-primary), var(--pv-primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.pv-hero p {
    font-size: 18px;
    color: var(--pv-text-muted);
    margin: 0 0 32px;
    line-height: 1.6;
}

.pv-hero-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
}

/* ---- Buttons ---- */
.pv-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 12px 28px;
    border-radius: var(--pv-radius-sm);
    font-size: 15px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: var(--pv-transition);
    text-decoration: none;
}

.pv-btn-primary {
    background: var(--pv-primary);
    color: #fff;
}

.pv-btn-primary:hover {
    background: var(--pv-primary-dark);
    box-shadow: 0 4px 12px rgba(99,102,241,.3);
    color: #fff;
    transform: translateY(-1px);
}

.pv-btn-ghost {
    background: #fff;
    color: var(--pv-text);
    border: 1px solid var(--pv-border);
}

.pv-btn-ghost:hover {
    border-color: var(--pv-primary-light);
    color: var(--pv-primary);
}

/* ---- Features ---- */
.pv-features {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px 80px;
}

.pv-features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.pv-feature-card {
    background: #fff;
    border-radius: var(--pv-radius);
    padding: 32px;
    border: 1px solid var(--pv-border);
    transition: var(--pv-transition);
}

.pv-feature-card:hover {
    box-shadow: var(--pv-shadow-md);
    transform: translateY(-4px);
}

.pv-feature-card .icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.pv-feature-card .icon svg { width: 28px; height: 28px; }

.pv-feature-card .icon.bg-indigo { background: var(--pv-primary-100); color: var(--pv-primary); }
.pv-feature-card .icon.bg-emerald { background: #d1fae5; color: var(--pv-success); }
.pv-feature-card .icon.bg-amber { background: #fef3c7; color: var(--pv-warning); }

.pv-feature-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin: 0 0 8px;
}

.pv-feature-card p {
    font-size: 14px;
    color: var(--pv-text-muted);
    margin: 0;
    line-height: 1.6;
}

/* ---- Footer ---- */
.pv-footer {
    border-top: 1px solid var(--pv-border);
    padding: 32px 24px;
    text-align: center;
    color: var(--pv-text-muted);
    font-size: 14px;
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
    .pv-hero h1 { font-size: 28px; }
    .pv-hero p { font-size: 16px; }
    .pv-navbar-nav { gap: 0; }
    .pv-navbar-nav a { padding: 6px 10px; font-size: 13px; }
}