:root {
    --primary: #6d28d9;
    --primary-light: #8b5cf6;
    --accent: #06b6d4;
    --accent2: #f59e0b;
    --success: #16a34a;
    --error: #dc2626;
    --bg: #f1f0fb;
    --card-bg: #ffffff;
    --border: #e5e0f7;
    --text: #1e1b2e;
    --text-muted: #6b6580;
}
* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: linear-gradient(160deg, #f1f0fb 0%, #e9e4ff 40%, #e0f7fa 100%);
    color: var(--text);
    min-height: 100vh;
}
.container { max-width: 960px; margin: 0 auto; padding: 24px 16px 60px; }

/* ===== Preloader ===== */
#preloader {
    position: fixed; inset: 0; z-index: 9999;
    background: linear-gradient(135deg, #6d28d9, #06b6d4);
    display: flex; align-items: center; justify-content: center;
    transition: opacity 0.4s ease;
}
#preloader.preloader-hide { opacity: 0; pointer-events: none; }
.preloader-dollar {
    font-size: 4em;
    font-weight: 800;
    color: #fff;
    text-shadow: 0 0 20px rgba(255,255,255,0.7);
    animation: dollar-spin 1s ease-in-out infinite;
}
@keyframes dollar-spin {
    0%, 100% { transform: scale(1) rotate(0deg); }
    50% { transform: scale(1.3) rotate(180deg); }
}

/* ===== Navbar ===== */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(90deg, #6d28d9, #8b5cf6 60%, #06b6d4);
    padding: 16px 24px;
    box-shadow: 0 4px 14px rgba(109, 40, 217, 0.25);
}
.navbar .logo { font-weight: 800; font-size: 1.4em; color: #fff; text-decoration: none; letter-spacing: 0.5px; }
.navbar nav a { margin-left: 18px; text-decoration: none; color: #f3effe; font-size: 0.95em; transition: color 0.2s, transform 0.2s; display: inline-block; }
.navbar nav a:hover { color: #fff; transform: translateY(-2px); }
.navbar nav a.btn-nav { background: var(--accent2); color: #fff; padding: 8px 16px; border-radius: 8px; box-shadow: 0 4px 0 #b45309; }
.navbar nav a.btn-nav:hover { transform: translateY(-2px); box-shadow: 0 6px 0 #b45309; }
.admin-navbar { background: linear-gradient(90deg, #1e1b2e, #4c1d95); }

.hero { text-align: center; padding: 60px 20px; }
.hero h1 { font-size: 2.4em; margin-bottom: 8px; background: linear-gradient(90deg, #6d28d9, #06b6d4); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p { color: var(--text-muted); margin: 6px 0; }

/* ===== 3D Buttons ===== */
.btn, button.btn {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    color: white;
    padding: 13px 28px;
    border: none;
    border-radius: 10px;
    font-size: 1em;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    margin-top: 16px;
    box-shadow: 0 5px 0 #4c1d95, 0 8px 16px rgba(109, 40, 217, 0.3);
    transition: transform 0.12s ease, box-shadow 0.12s ease, filter 0.2s ease;
}
.btn:hover { filter: brightness(1.08); transform: translateY(-2px); box-shadow: 0 7px 0 #4c1d95, 0 12px 20px rgba(109, 40, 217, 0.35); }
.btn:active { transform: translateY(3px); box-shadow: 0 2px 0 #4c1d95, 0 4px 8px rgba(109, 40, 217, 0.3); }
.btn:disabled { background: #b6b0cc; box-shadow: 0 5px 0 #8b86a3; cursor: not-allowed; filter: none; transform: none; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 18px; margin-top: 24px; }
.card {
    background: var(--card-bg);
    border-radius: 14px;
    padding: 22px;
    box-shadow: 0 6px 18px rgba(109, 40, 217, 0.1);
    border: 1px solid var(--border);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 12px 26px rgba(109, 40, 217, 0.18); }

/* ===== Stat cards (colorful, alternating accents) ===== */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; margin: 22px 0; }
.stat-card {
    background: var(--card-bg);
    border-radius: 14px;
    padding: 20px;
    text-align: center;
    box-shadow: 0 6px 16px rgba(109, 40, 217, 0.12);
    border-top: 4px solid var(--primary);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.stat-card:hover { transform: translateY(-5px) scale(1.02); box-shadow: 0 14px 24px rgba(109, 40, 217, 0.2); }
.stat-card:nth-child(4n+1) { border-top-color: #6d28d9; }
.stat-card:nth-child(4n+2) { border-top-color: #06b6d4; }
.stat-card:nth-child(4n+3) { border-top-color: #f59e0b; }
.stat-card:nth-child(4n+4) { border-top-color: #16a34a; }
.stat-label { display: block; color: var(--text-muted); font-size: 0.85em; margin-bottom: 6px; }
.stat-value { display: block; font-size: 1.6em; font-weight: 800; color: var(--primary); }

.form-page { max-width: 420px; margin: 20px auto; background: var(--card-bg); padding: 30px; border-radius: 16px; box-shadow: 0 10px 30px rgba(109, 40, 217, 0.15); border: 1px solid var(--border); }
.admin-login { margin: 80px auto; }
.form-page label { display: block; margin-top: 14px; margin-bottom: 4px; font-size: 0.9em; color: var(--text-muted); }
.form-page input, .form-page select, .form-page textarea,
form input[type=text], form input[type=email], form input[type=password], form input[type=number], form select, form textarea {
    width: 100%; padding: 11px; border: 1px solid var(--border); border-radius: 8px; font-size: 1em;
    transition: border-color 0.2s, box-shadow 0.2s;
}
form input:focus, form select:focus, form textarea:focus {
    outline: none; border-color: var(--primary-light); box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.2);
}

.alert { padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; font-weight: 500; }
.alert-error { background: #fee2e2; color: var(--error); }
.alert-success { background: #dcfce7; color: var(--success); }

.ad-slot { min-height: 250px; background: linear-gradient(135deg, #ede9fe, #cffafe); border: 2px dashed #a78bfa; border-radius: 14px; display: flex; align-items: center; justify-content: center; margin: 20px 0; }
.timer-box { text-align: center; }
#timer-display { font-size: 2.6em; font-weight: 800; color: var(--primary); margin-bottom: 10px; }

.referral-box { margin-top: 30px; background: linear-gradient(135deg, #fff, #f3effe); padding: 22px; border-radius: 14px; border: 1px solid var(--border); box-shadow: 0 6px 16px rgba(109, 40, 217, 0.1); }
.referral-box input { width: 100%; padding: 11px; margin-top: 8px; border: 1px solid var(--border); border-radius: 8px; }

.data-table { width: 100%; border-collapse: collapse; margin-top: 16px; background: var(--card-bg); border-radius: 12px; overflow: hidden; box-shadow: 0 6px 16px rgba(109, 40, 217, 0.08); }
.data-table th, .data-table td { padding: 12px 14px; border-bottom: 1px solid var(--border); text-align: left; font-size: 0.92em; }
.data-table th { background: linear-gradient(90deg, #6d28d9, #8b5cf6); color: #fff; }
.data-table tr:hover td { background: #f8f6ff; }

.badge { padding: 4px 12px; border-radius: 20px; font-size: 0.8em; font-weight: 700; }
.badge-pending { background: #fef9c3; color: #854d0e; }
.badge-approved { background: #dcfce7; color: var(--success); }
.badge-rejected { background: #fee2e2; color: var(--error); }

.inline-form { display: inline-flex; gap: 6px; align-items: center; margin: 4px 0; }
.mini-input { width: 100px; padding: 7px; border: 1px solid var(--border); border-radius: 6px; }
.btn-sm {
    padding: 7px 14px; border-radius: 7px; border: none;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    color: white; cursor: pointer; font-size: 0.85em; font-weight: 600;
    box-shadow: 0 3px 0 #4c1d95;
    transition: transform 0.12s, box-shadow 0.12s, filter 0.2s;
}
.btn-sm:hover { filter: brightness(1.1); transform: translateY(-1px); }
.btn-sm:active { transform: translateY(2px); box-shadow: 0 1px 0 #4c1d95; }
.btn-approve { background: linear-gradient(135deg, #22c55e, #16a34a); box-shadow: 0 3px 0 #15803d; }
.btn-reject { background: linear-gradient(135deg, #f87171, #dc2626); box-shadow: 0 3px 0 #991b1b; }
.actions-cell { display: flex; flex-direction: column; gap: 6px; }

.tabs { margin: 16px 0; }
.tabs a { padding: 9px 18px; text-decoration: none; color: var(--text-muted); border-bottom: 3px solid transparent; margin-right: 6px; transition: color 0.2s, border-color 0.2s; }
.tabs a:hover { color: var(--primary); }
.tabs a.active { color: var(--primary); border-bottom-color: var(--primary); font-weight: 700; }

.site-footer { text-align: center; padding: 22px; color: var(--text-muted); font-size: 0.85em; }

.btn-spinner {
    display: inline-block;
    animation: dollar-spin 0.8s ease-in-out infinite;
    font-weight: 800;
}

/* ===== User ID tag on dashboard ===== */
.user-uid-tag {
    display: inline-block;
    background: linear-gradient(135deg, #ede9fe, #cffafe);
    border: 1px solid var(--border);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.9em;
    color: var(--primary);
    margin: 4px 0 20px;
}

/* ===== Rain drop effect (dashboard only) ===== */
.rain-container {
    position: fixed;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
    z-index: 1;
}
.raindrop {
    position: absolute;
    top: -30px;
    width: 2px;
    height: 70px;
    background: linear-gradient(to bottom, transparent, #06b6d4, #6d28d9);
    border-radius: 2px;
    animation-name: rain-fall;
    animation-timing-function: linear;
    animation-iteration-count: infinite;
}
@keyframes rain-fall {
    0% { transform: translateY(-10vh); }
    100% { transform: translateY(110vh); }
}
.dashboard, .navbar, .container { position: relative; z-index: 2; }