/* ===== Team Splitter - Professional Group Generator ===== */
:root {
    --bg: #f8f9fa;
    --bg-card: #ffffff;
    --bg-input: #f1f3f5;
    --text: #1a1a2e;
    --text-secondary: #6c757d;
    --border: #dee2e6;
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: #eef2ff;
    --accent: #f59e0b;
    --success: #10b981;
    --danger: #ef4444;
    --shadow: 0 1px 3px rgba(0,0,0,.1), 0 1px 2px rgba(0,0,0,.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.1), 0 4px 6px -4px rgba(0,0,0,.1);
    --radius: 12px;
    --radius-sm: 8px;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

[data-theme="dark"] {
    --bg: #0f172a;
    --bg-card: #1e293b;
    --bg-input: #334155;
    --text: #e2e8f0;
    --text-secondary: #94a3b8;
    --border: #334155;
    --primary: #818cf8;
    --primary-hover: #6366f1;
    --primary-light: #1e1b4b;
    --shadow: 0 1px 3px rgba(0,0,0,.3), 0 1px 2px rgba(0,0,0,.2);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.5), 0 4px 6px -4px rgba(0,0,0,.4);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font); background: var(--bg); color: var(--text); line-height: 1.6; min-height: 100vh; transition: background .3s, color .3s; }

/* ===== Container ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ===== Header ===== */
.header { background: var(--bg-card); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 100; backdrop-filter: blur(12px); background: rgba(255,255,255,.8); }
[data-theme="dark"] .header { background: rgba(15,23,42,.9); }
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 14px 0; gap: 12px; }
.logo { display: flex; align-items: center; gap: 8px; font-size: 1.25rem; font-weight: 800; color: var(--primary); text-decoration: none; }
.logo-icon { width: 36px; height: 36px; background: var(--primary); color: #fff; border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 1.1rem; font-weight: 700; }
.header-actions { display: flex; align-items: center; gap: 8px; }
.lang-btn { border: none; background: transparent; padding: 6px 12px; border-radius: var(--radius-sm); cursor: pointer; color: var(--text-secondary); font-size: .85rem; font-weight: 500; transition: all .2s; }
.lang-btn.active { background: var(--primary); color: #fff; }
.lang-btn:hover:not(.active) { background: var(--bg-input); }
.theme-toggle { border: none; background: transparent; padding: 8px; border-radius: var(--radius-sm); cursor: pointer; font-size: 1.1rem; color: var(--text); transition: all .2s; }
.theme-toggle:hover { background: var(--bg-input); }

/* ===== Hero ===== */
.hero { padding: 60px 0 40px; text-align: center; }
.hero h1 { font-size: clamp(1.8rem, 4vw, 3rem); font-weight: 800; line-height: 1.2; margin-bottom: 12px; }
.hero h1 span { color: var(--primary); }
.hero-sub { font-size: 1.05rem; color: var(--text-secondary); max-width: 600px; margin: 0 auto 24px; }
.hero-cta { display: inline-flex; align-items: center; gap: 8px; padding: 14px 32px; background: var(--primary); color: #fff; border: none; border-radius: var(--radius); font-size: 1rem; font-weight: 600; cursor: pointer; transition: all .2s; text-decoration: none; }
.hero-cta:hover { background: var(--primary-hover); transform: translateY(-1px); box-shadow: var(--shadow-lg); }

/* ===== Features ===== */
.features { padding: 20px 0 40px; }
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; }
.feature-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; text-align: center; transition: all .2s; }
.feature-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.feature-icon { font-size: 2rem; margin-bottom: 12px; }
.feature-card h3 { font-size: .95rem; font-weight: 700; margin-bottom: 4px; }
.feature-card p { font-size: .85rem; color: var(--text-secondary); }

/* ===== Main App ===== */
.app-section { padding: 20px 0 60px; }
.app-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
@media (max-width: 768px) { .app-layout { grid-template-columns: 1fr; } }

/* ===== Panels ===== */
.panel { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.panel-title { font-size: 1.1rem; font-weight: 700; margin-bottom: 16px; display: flex; align-items: center; gap: 8px; }

/* ===== Form Elements ===== */
.form-group { margin-bottom: 16px; }
.form-label { display: block; font-size: .85rem; font-weight: 600; margin-bottom: 6px; color: var(--text); }
textarea, input[type="text"], input[type="number"], select {
    width: 100%; padding: 10px 14px; border: 1px solid var(--border); border-radius: var(--radius-sm);
    background: var(--bg-input); color: var(--text); font-size: .9rem; font-family: var(--font);
    transition: border-color .2s; outline: none;
}
textarea:focus, input:focus, select:focus { border-color: var(--primary); }
textarea { min-height: 120px; resize: vertical; font-family: 'SF Mono', 'Fira Code', monospace; }

.input-hint { font-size: .8rem; color: var(--text-secondary); margin-top: 4px; }

/* ===== Buttons ===== */
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 10px 20px; border: none; border-radius: var(--radius-sm); font-size: .9rem; font-weight: 600; cursor: pointer; transition: all .2s; font-family: var(--font); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-1px); }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn-outline:hover { background: var(--bg-input); }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { opacity: .9; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-sm { padding: 6px 12px; font-size: .8rem; }
.btn-group { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }

/* ===== Mode Selector ===== */
.mode-selector { display: flex; gap: 12px; margin-bottom: 16px; }
.mode-btn { flex: 1; padding: 12px; border: 2px solid var(--border); border-radius: var(--radius-sm); background: transparent; cursor: pointer; text-align: center; transition: all .2s; }
.mode-btn:hover { border-color: var(--primary); }
.mode-btn.active { border-color: var(--primary); background: var(--primary-light); }
.mode-btn .mode-icon { font-size: 1.3rem; display: block; margin-bottom: 4px; }
.mode-btn .mode-label { font-size: .85rem; font-weight: 600; display: block; }
.mode-btn .mode-desc { font-size: .75rem; color: var(--text-secondary); display: block; }

.mode-config { display: none; }
.mode-config.active { display: block; }

.config-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 16px; }
@media (max-width: 480px) { .config-row { grid-template-columns: 1fr; } }

/* ===== Name Tags ===== */
.name-tags { display: flex; flex-wrap: wrap; gap: 6px; padding: 8px 0; }
.name-tag { display: inline-flex; align-items: center; gap: 4px; background: var(--primary-light); color: var(--primary); padding: 4px 10px; border-radius: 20px; font-size: .82rem; font-weight: 500; }
.name-tag .remove-tag { cursor: pointer; font-size: .9rem; line-height: 1; opacity: .6; transition: opacity .2s; }
.name-tag .remove-tag:hover { opacity: 1; }

/* ===== Results ===== */
.result-area { min-height: 200px; }
.result-empty { text-align: center; padding: 40px 20px; color: var(--text-secondary); }
.result-empty .empty-icon { font-size: 3rem; margin-bottom: 12px; }
.result-empty h3 { font-size: 1.1rem; color: var(--text); margin-bottom: 6px; }

.group-card { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 16px; margin-bottom: 12px; }
.group-card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.group-card-title { font-weight: 700; font-size: .9rem; color: var(--primary); }
.group-card-count { font-size: .8rem; color: var(--text-secondary); }
.group-members { display: flex; flex-wrap: wrap; gap: 6px; }
.group-member { background: var(--bg-card); border: 1px solid var(--border); padding: 4px 12px; border-radius: 16px; font-size: .85rem; }

.export-actions { display: flex; gap: 8px; margin-top: 16px; flex-wrap: wrap; }

/* ===== History/Examples ===== */
.examples { padding: 40px 0; background: var(--bg-card); }
.examples-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.example-card { border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; transition: all .2s; cursor: pointer; }
.example-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.example-card h3 { font-size: 1rem; margin-bottom: 6px; }
.example-card p { font-size: .85rem; color: var(--text-secondary); margin-bottom: 8px; }
.example-badge { display: inline-block; padding: 2px 8px; border-radius: 12px; font-size: .7rem; font-weight: 600; background: var(--primary-light); color: var(--primary); }

/* ===== Testimonials ===== */
.testimonials { padding: 40px 0; }
.testimonial-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.testimonial-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.testimonial-card .stars { color: var(--accent); margin-bottom: 8px; }
.testimonial-card p { font-size: .85rem; color: var(--text-secondary); margin-bottom: 8px; font-style: italic; }
.testimonial-card .author { font-size: .8rem; font-weight: 600; }

/* ===== Footer ===== */
.footer { background: var(--bg-card); border-top: 1px solid var(--border); padding: 40px 0 20px; margin-top: 40px; }
.footer-inner { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 24px; margin-bottom: 24px; }
@media (max-width: 768px) { .footer-inner { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px) { .footer-inner { grid-template-columns: 1fr; } }
.footer-brand .logo { margin-bottom: 8px; }
.footer-desc { font-size: .85rem; color: var(--text-secondary); margin-bottom: 12px; }
.footer-col h4 { font-size: .9rem; font-weight: 700; margin-bottom: 12px; }
.footer-col a { display: block; font-size: .85rem; color: var(--text-secondary); text-decoration: none; padding: 4px 0; transition: color .2s; }
.footer-col a:hover { color: var(--primary); }
.footer-bottom { border-top: 1px solid var(--border); padding-top: 16px; text-align: center; font-size: .82rem; color: var(--text-secondary); }

/* ===== Modal ===== */
.modal-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,.5); z-index: 200; align-items: center; justify-content: center; padding: 20px; }
.modal-overlay.active { display: flex; }
.modal { background: var(--bg-card); border-radius: var(--radius); padding: 32px; max-width: 600px; width: 100%; max-height: 80vh; overflow-y: auto; }
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.modal-header h2 { font-size: 1.2rem; font-weight: 700; }
.modal-close { border: none; background: transparent; font-size: 1.5rem; cursor: pointer; color: var(--text-secondary); padding: 4px; line-height: 1; }
.modal-body { font-size: .9rem; color: var(--text-secondary); line-height: 1.7; }
.modal-body strong { color: var(--text); }

/* ===== Ad Placeholder ===== */
.ad-container { text-align: center; padding: 20px; min-height: 90px; background: var(--bg-input); margin: 20px 0; border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; color: var(--text-secondary); font-size: .85rem; }

/* ===== Animations ===== */
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
.fade-in { animation: fadeIn .3s ease; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .5; } }
.loading { animation: pulse 1.5s ease-in-out infinite; }

/* ===== Responsive ===== */
@media (max-width: 480px) {
    .hero { padding: 40px 0 20px; }
    .panel { padding: 16px; }
    .mode-selector { flex-direction: column; }
    .btn-group { flex-direction: column; }
    .btn-group .btn { width: 100%; justify-content: center; }
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-secondary); }

/* ===== Utility ===== */
.text-center { text-align: center; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.gap-8 { gap: 8px; }
.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }

/* ===== FAQ ===== */
.faq-section { padding: 40px 0; }
.faq-item { border-bottom: 1px solid var(--border); padding: 16px 0; }
.faq-question { font-weight: 600; cursor: pointer; display: flex; justify-content: space-between; align-items: center; }
.faq-question::after { content: '+'; font-size: 1.2rem; transition: transform .2s; }
.faq-item.open .faq-question::after { transform: rotate(45deg); }
.faq-answer { display: none; padding-top: 12px; font-size: .9rem; color: var(--text-secondary); line-height: 1.7; }
.faq-item.open .faq-answer { display: block; }