/* ── Reset & Base ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
    --bg-primary: #0f0f14;
    --bg-secondary: #1a1a24;
    --bg-card: #1e1e2e;
    --bg-card-hover: #252538;
    --bg-input: #16161f;
    --text-primary: #e8e8ed;
    --text-secondary: #8888a0;
    --text-muted: #5c5c72;
    --accent: #7c5cfc;
    --accent-hover: #9478ff;
    --accent-glow: rgba(124, 92, 252, 0.25);
    --accent-soft: rgba(124, 92, 252, 0.1);
    --border: #2a2a3c;
    --border-light: #33334a;
    --success: #3dd68c;
    --danger: #f06565;
    --danger-soft: rgba(240, 101, 101, 0.1);
    --radius: 14px;
    --radius-sm: 10px;
    --radius-xs: 6px;
    --shadow: 0 8px 32px rgba(0,0,0,0.3);
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-hover); }
code {
    background: var(--bg-input);
    padding: 2px 8px;
    border-radius: var(--radius-xs);
    font-size: 0.88em;
    color: var(--accent);
    border: 1px solid var(--border);
}

/* ── Buyer Page ──────────────────────────────────────────── */
.buyer-body {
    background: var(--bg-primary);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}
.buyer-body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 40%, rgba(124, 92, 252, 0.08) 0%, transparent 50%),
                radial-gradient(circle at 70% 60%, rgba(61, 214, 140, 0.05) 0%, transparent 50%);
    animation: bgShift 20s ease-in-out infinite alternate;
    z-index: 0;
}
@keyframes bgShift {
    0% { transform: translate(0, 0); }
    100% { transform: translate(-5%, -3%); }
}

.buyer-container {
    width: 100%;
    max-width: 440px;
    padding: 20px;
    position: relative;
    z-index: 1;
}

.buyer-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 40px 32px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(20px);
    position: relative;
}

.buyer-header { text-align: center; margin-bottom: 32px; }
.buyer-icon { font-size: 44px; margin-bottom: 12px; filter: drop-shadow(0 4px 12px var(--accent-glow)); }
.buyer-header h1 { font-size: 22px; font-weight: 700; color: var(--text-primary); letter-spacing: -0.3px; }
.buyer-subtitle { color: var(--text-secondary); font-size: 13px; margin-top: 6px; }

.buyer-form { display: flex; flex-direction: column; gap: 14px; }

.input-group { display: flex; flex-direction: column; gap: 6px; }
.input-group label { font-size: 12px; font-weight: 600; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.5px; }
.input-group input {
    padding: 13px 16px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--text-primary);
    transition: all var(--transition);
    outline: none;
}
.input-group input::placeholder { color: var(--text-muted); }
.input-group input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }

.buyer-form button, #btn-login {
    padding: 14px;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    letter-spacing: 0.2px;
}
.buyer-form button:hover, #btn-login:hover {
    background: var(--accent-hover);
    box-shadow: 0 4px 20px var(--accent-glow);
    transform: translateY(-1px);
}
.buyer-form button:active, #btn-login:active { transform: translateY(0) scale(0.99); }

.buyer-result { margin-top: 20px; }

.result-loading, .result-found, .result-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 28px 20px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.spinner {
    width: 28px; height: 28px;
    border: 2.5px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.otp-label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-muted);
    font-weight: 600;
}
.otp-code {
    font-family: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
    font-size: 40px;
    font-weight: 700;
    letter-spacing: 10px;
    color: var(--accent);
    cursor: pointer;
    padding: 8px 20px;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    text-shadow: 0 0 30px var(--accent-glow);
}
.otp-code:hover { background: var(--accent-soft); }
.otp-code.pulse { animation: pulse 0.5s ease; }
@keyframes pulse { 0%,100%{transform:scale(1)} 50%{transform:scale(1.04)} }

.copy-btn {
    padding: 8px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-xs);
    cursor: pointer;
    font-size: 12px;
    color: var(--text-secondary);
    transition: all var(--transition);
}
.copy-btn:hover { background: var(--bg-card-hover); color: var(--text-primary); border-color: var(--border-light); }

.otp-meta { display: flex; gap: 16px; font-size: 11px; color: var(--text-muted); }

.auto-refresh {
    display: flex; align-items: center; gap: 8px;
    font-size: 11px; color: var(--text-muted);
}
.refresh-dot {
    width: 6px; height: 6px;
    background: var(--success);
    border-radius: 50%;
    animation: blink 2s infinite;
    box-shadow: 0 0 8px rgba(61, 214, 140, 0.4);
}
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0.3} }

.empty-icon { font-size: 36px; opacity: 0.7; }
.result-empty p { color: var(--text-secondary); font-size: 14px; }
.empty-hint { font-size: 12px !important; color: var(--text-muted) !important; }

.toast {
    position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
    background: var(--accent); color: #fff; padding: 10px 24px;
    border-radius: var(--radius-xs); font-size: 13px; z-index: 999;
    animation: fadeIn 0.3s; font-weight: 500;
    box-shadow: 0 8px 24px var(--accent-glow);
}
@keyframes fadeIn { from{opacity:0;transform:translateX(-50%) translateY(10px)} to{opacity:1;transform:translateX(-50%) translateY(0)} }

.buyer-footer { text-align: center; margin-top: 20px; }
.buyer-footer a { color: var(--text-muted); font-size: 12px; transition: color var(--transition); }
.buyer-footer a:hover { color: var(--accent); }

.form-error { color: var(--danger); font-size: 13px; text-align: center; }

/* ── Admin Page ──────────────────────────────────────────── */
.admin-body { background: var(--bg-primary); min-height: 100vh; }

.admin-topbar {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    color: var(--text-primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 24px;
    height: 52px;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
}
.topbar-left { display: flex; align-items: center; gap: 10px; }
.topbar-icon { font-size: 18px; }
.topbar-left h1 { font-size: 15px; font-weight: 600; letter-spacing: -0.2px; }
.topbar-right { display: flex; align-items: center; gap: 14px; }
.topbar-link { color: var(--text-muted); font-size: 12px; transition: color var(--transition); }
.topbar-link:hover { color: var(--text-primary); text-decoration: none; }
.btn-logout {
    background: transparent; border: 1px solid var(--border); color: var(--text-muted);
    padding: 5px 14px; border-radius: var(--radius-xs); font-size: 12px; cursor: pointer;
    transition: all var(--transition);
}
.btn-logout:hover { border-color: var(--danger); color: var(--danger); }

.admin-content { max-width: 960px; margin: 0 auto; padding: 24px 20px; }

/* Stats */
.stats-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-bottom: 24px; }
.stat-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 20px;
    text-align: center; transition: all var(--transition);
}
.stat-card:hover { border-color: var(--border-light); transform: translateY(-2px); box-shadow: var(--shadow); }
.stat-number { font-size: 30px; font-weight: 700; color: var(--accent); letter-spacing: -1px; }
.stat-label { font-size: 11px; color: var(--text-muted); margin-top: 4px; text-transform: uppercase; letter-spacing: 0.5px; font-weight: 500; }

/* Tabs */
.tabs {
    display: flex; gap: 2px;
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius) var(--radius) 0 0;
    padding: 6px 6px 0;
}
.tab {
    padding: 10px 20px; background: transparent; border: none;
    font-size: 13px; font-weight: 500; color: var(--text-muted); cursor: pointer;
    border-radius: var(--radius-xs) var(--radius-xs) 0 0; transition: all var(--transition);
}
.tab:hover { color: var(--text-secondary); }
.tab.active { background: var(--bg-primary); color: var(--accent); font-weight: 600; }

.tab-panel {
    display: none; background: var(--bg-card); padding: 24px;
    border: 1px solid var(--border); border-top: none;
    border-radius: 0 0 var(--radius) var(--radius);
}
.tab-panel.active { display: block; }

.panel-header {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 16px;
}
.panel-header h2 { font-size: 16px; font-weight: 600; letter-spacing: -0.2px; }

/* Buttons */
.btn-primary {
    padding: 8px 16px; background: var(--accent); color: #fff; border: none;
    border-radius: var(--radius-xs); font-size: 12px; font-weight: 600; cursor: pointer;
    transition: all var(--transition); letter-spacing: 0.2px;
}
.btn-primary:hover { background: var(--accent-hover); box-shadow: 0 4px 16px var(--accent-glow); }
.btn-secondary {
    padding: 8px 16px; background: var(--bg-input); color: var(--text-secondary);
    border: 1px solid var(--border); border-radius: var(--radius-xs);
    font-size: 12px; font-weight: 500; cursor: pointer; transition: all var(--transition);
}
.btn-secondary:hover { background: var(--bg-card-hover); color: var(--text-primary); }
.btn-danger-sm {
    padding: 4px 12px; background: var(--danger-soft); color: var(--danger);
    border: 1px solid rgba(240, 101, 101, 0.2); border-radius: var(--radius-xs);
    font-size: 11px; cursor: pointer; font-weight: 500; transition: all var(--transition);
}
.btn-danger-sm:hover { background: rgba(240, 101, 101, 0.15); border-color: var(--danger); }

/* Forms */
.add-form {
    margin-bottom: 16px; padding: 16px;
    background: var(--bg-input); border: 1px solid var(--border);
    border-radius: var(--radius-sm);
}
.form-row { display: flex; gap: 8px; flex-wrap: wrap; }
.form-row input, .form-row select {
    flex: 1; min-width: 140px; padding: 10px 12px;
    background: var(--bg-primary); border: 1px solid var(--border);
    border-radius: var(--radius-xs); font-size: 13px; outline: none;
    color: var(--text-primary); transition: all var(--transition);
}
.form-row input::placeholder { color: var(--text-muted); }
.form-row input:focus, .form-row select:focus { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-glow); }
.form-row select { color: var(--text-secondary); }
.form-row select option { background: var(--bg-primary); color: var(--text-primary); }
.form-hint { font-size: 11px; color: var(--text-muted); margin-top: 8px; }
.form-hint a { color: var(--accent); }
textarea {
    width: 100%; padding: 12px;
    background: var(--bg-primary); border: 1px solid var(--border);
    border-radius: var(--radius-xs); color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace; font-size: 12px; resize: vertical;
    outline: none; margin-bottom: 8px; transition: border-color var(--transition);
}
textarea::placeholder { color: var(--text-muted); }
textarea:focus { border-color: var(--accent); }

/* Tables */
.data-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.data-table th {
    text-align: left; padding: 10px 12px; font-size: 11px; font-weight: 600;
    color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border);
}
.data-table td { padding: 10px 12px; border-bottom: 1px solid var(--border); color: var(--text-secondary); }
.data-table tr:hover { background: var(--accent-soft); }
.data-table td strong { color: var(--accent); font-family: 'JetBrains Mono', monospace; }

.badge {
    display: inline-block; padding: 3px 10px; border-radius: 20px;
    font-size: 11px; font-weight: 600; letter-spacing: 0.3px;
}
.badge-green { background: rgba(61, 214, 140, 0.1); color: var(--success); border: 1px solid rgba(61, 214, 140, 0.2); }
.badge-red { background: var(--danger-soft); color: var(--danger); border: 1px solid rgba(240, 101, 101, 0.2); }

.text-muted { color: var(--text-muted); }
.empty-msg { text-align: center; padding: 32px; color: var(--text-muted); font-size: 13px; }

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 640px) {
    .stats-row { grid-template-columns: 1fr; }
    .form-row { flex-direction: column; }
    .form-row input, .form-row select { min-width: auto; }
    .buyer-card { padding: 28px 20px; }
    .otp-code { font-size: 30px; letter-spacing: 8px; }
    .panel-header { flex-direction: column; gap: 8px; align-items: flex-start; }
    .data-table { font-size: 11px; }
    .data-table th, .data-table td { padding: 8px 6px; }
    .tabs { overflow-x: auto; }
}