:root {
    --bg: #f4f6fb;
    --card-bg: #ffffff;
    --text: #1a1d2e;
    --text-muted: #6b7280;
    --border: #e2e5ec;
    --primary: #4f6df5;
    --primary-hover: #3b56d9;
    --success: #1fb978;
    --danger: #ef4444;
    --shadow: 0 2px 10px rgba(0,0,0,0.05);
    --radius: 12px;
}

[data-theme="dark"] {
    --bg: #11131f;
    --card-bg: #1b1e2e;
    --text: #eef0f7;
    --text-muted: #9aa0b4;
    --border: #2c2f42;
    --primary: #6c8aff;
    --primary-hover: #8aa0ff;
    --success: #2ecc8f;
    --danger: #ff6b6b;
    --shadow: 0 2px 14px rgba(0,0,0,0.4);
}

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

body {
    font-family: 'Segoe UI', system-ui, -apple-system, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    transition: background 0.3s, color 0.3s;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a { color: var(--primary); text-decoration: none; }

/* ===== Navbar ===== */
.navbar {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    padding: 14px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.navbar .logo {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--text);
}
.navbar .logo span { color: var(--primary); }

.nav-links {
    display: flex;
    gap: 22px;
    align-items: center;
}

.nav-links a {
    color: var(--text);
    font-weight: 600;
    font-size: 0.95rem;
}
.nav-links a:hover { color: var(--primary); }

.theme-toggle {
    background: var(--border);
    border: none;
    border-radius: 20px;
    width: 46px;
    height: 26px;
    cursor: pointer;
    position: relative;
    flex-shrink: 0;
}
.theme-toggle::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary);
    transition: transform 0.25s;
}
[data-theme="dark"] .theme-toggle::after {
    transform: translateX(20px);
}

/* Mobile menu */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.6rem;
    color: var(--text);
    cursor: pointer;
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--card-bg);
        flex-direction: column;
        padding: 14px 20px;
        border-bottom: 1px solid var(--border);
        gap: 14px;
        box-shadow: var(--shadow);
    }
    .nav-links.open { display: flex; }
    .menu-toggle { display: block; }
}

/* ===== Layout ===== */
.container {
    max-width: 760px;
    margin: 0 auto;
    padding: 24px 16px 60px;
    width: 100%;
    flex: 1;
}

/* ===== Cards ===== */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 22px;
    margin-bottom: 20px;
}

.card h2, .card h3 { margin-bottom: 12px; }
.card p { color: var(--text-muted); margin-bottom: 8px; line-height: 1.5; }

/* ===== Banner ad slots ===== */
.banner-slot {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 18px auto;
    overflow: hidden;
}
.banner-slot.banner-728 {
    max-width: 728px;
    min-height: 90px;
}
.banner-slot.banner-468 {
    max-width: 468px;
    min-height: 60px;
}
.banner-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}
.banner-slot.banner-300 {
    max-width: 300px;
    min-height: 250px;
}

/* Desktop-only banner (728x90) */
.desktop-only-banner {
    display: none;
}
@media (min-width: 800px) {
    .desktop-only-banner { display: flex; }
}

/* ===== Forms ===== */
label {
    display: block;
    font-weight: 600;
    margin-bottom: 6px;
    font-size: 0.92rem;
}

input[type="email"],
input[type="text"],
input[type="password"],
input[type="number"],
select,
textarea {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg);
    color: var(--text);
    font-size: 1rem;
    margin-bottom: 16px;
    transition: border-color 0.2s;
}
input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.btn {
    display: inline-block;
    width: 100%;
    padding: 13px 20px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    text-align: center;
    transition: background 0.2s, transform 0.1s;
}
.btn:hover { background: var(--primary-hover); }
.btn:active { transform: scale(0.98); }
.btn:disabled { opacity: 0.6; cursor: not-allowed; }

.btn-secondary {
    background: transparent;
    color: var(--primary);
    border: 1px solid var(--primary);
}
.btn-secondary:hover { background: var(--primary); color: #fff; }

/* ===== Site Intro (centered, branded) ===== */
.site-intro {
    text-align: center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-hover) 100%);
    border: none;
}
.site-title {
    color: #fff;
    font-size: 1.6rem;
    font-weight: 800;
    letter-spacing: 0.5px;
    margin-bottom: 6px;
}
.site-desc {
    color: #ffffff;
    font-size: 0.95rem;
    font-weight: 500;
    margin-bottom: 0;
    opacity: 0.95;
}

/* ===== Mini stat cards ===== */
.mini-stats-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 20px;
}
.mini-stat-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 12px 8px;
    text-align: center;
}
.mini-stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}
.mini-stat-value {
    font-size: 1rem;
    font-weight: 800;
    color: var(--primary);
    word-break: break-word;
}
@media (max-width: 480px) {
    .mini-stat-value { font-size: 0.85rem; }
}

/* ===== Captcha grid (6 icons: 1 row desktop, 3x3 mobile) ===== */
.captcha-target {
    text-align: center;
    font-size: 1.8rem;
    margin-bottom: 10px;
}
.captcha-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 8px;
    margin-bottom: 16px;
}
.captcha-icon {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 1.3rem;
    padding: 8px 0;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.15s, transform 0.1s;
}
.captcha-icon:hover { border-color: var(--primary); transform: scale(1.04); }
.captcha-icon.selected { border-color: var(--success); background: rgba(31,185,120,0.1); }

@media (max-width: 480px) {
    .captcha-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ===== Alerts ===== */
.alert {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 16px;
    font-size: 0.92rem;
}
.alert-error {
    background: rgba(239,68,68,0.1);
    border: 1px solid var(--danger);
    color: var(--danger);
}
.alert-success {
    background: rgba(46,204,143,0.1);
    border: 1px solid var(--success);
    color: var(--success);
}
.alert-info {
    background: rgba(79,109,245,0.1);
    border: 1px solid var(--primary);
    color: var(--primary);
}

/* ===== Tap Game ===== */
.tap-arena {
    position: relative;
    width: 100%;
    height: 320px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    margin: 16px 0;
}
.tap-ball {
    position: absolute;
    width: 70px;
    height: 70px;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, var(--primary-hover), var(--primary));
    box-shadow: 0 4px 14px rgba(79,109,245,0.4);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 800;
    font-size: 1.6rem;
    user-select: none;
    transition: top 0.25s ease, left 0.25s ease;
}
.tap-ball:active { transform: scale(0.92); }

.round-progress {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    font-weight: 700;
}
.tap-counter-bar {
    height: 10px;
    background: var(--border);
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: 16px;
}
.tap-counter-fill {
    height: 100%;
    background: var(--primary);
    transition: width 0.2s ease;
    border-radius: 6px;
}

.round-dots {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 16px;
}
.round-dot {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--border);
    border: 2px solid var(--border);
}
.round-dot.active { background: var(--primary); border-color: var(--primary); }
.round-dot.done { background: var(--success); border-color: var(--success); }

.success-box {
    text-align: center;
    padding: 30px 16px;
}
.success-box .icon { font-size: 3.5rem; margin-bottom: 10px; }

/* ===== Footer ===== */
.site-footer {
    text-align: center;
    padding: 20px;
    color: var(--text-muted);
    font-size: 0.85rem;
    border-top: 1px solid var(--border);
    background: var(--card-bg);
}

/* ===== Stat Grid (admin) ===== */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 14px;
    margin-bottom: 24px;
}
.stat-box {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 18px;
    text-align: center;
}
.stat-box .value { font-size: 1.6rem; font-weight: 800; color: var(--primary); }
.stat-box .label { font-size: 0.85rem; color: var(--text-muted); margin-top: 4px; }

/* ===== Admin Nav ===== */
.admin-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}
.admin-tabs a {
    padding: 10px 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text);
    background: var(--card-bg);
}
.admin-tabs a.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}
table th, table td {
    border: 1px solid var(--border);
    padding: 10px;
    text-align: left;
    font-size: 0.9rem;
}
table th { background: var(--bg); }

.small-text { font-size: 0.85rem; color: var(--text-muted); }
.text-center { text-align: center; }
.mb-0 { margin-bottom: 0; }
.mt-16 { margin-top: 16px; }