/*
 * Premium Design System
 * Dark Mode + Glassmorphism + Vibrant Accents
 */

:root {
    --primary-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
    --bg-dark: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --accent-cyan: #22d3ee;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background: var(--bg-dark);
    background-image: radial-gradient(circle at top right, rgba(99, 102, 241, 0.15), transparent),
                      radial-gradient(circle at bottom left, rgba(236, 72, 153, 0.15), transparent);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    overflow-x: hidden;
}

/* Glass Container */
.glass-container {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    padding: 2.5rem;
    width: 90%;
    max-width: 600px;
    margin-top: 4rem;
    text-align: center;
    animation: fadeIn 0.8s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

h1 {
    font-size: clamp(1.5rem, 4vw, 2.2rem);
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: var(--text-primary);
    margin-bottom: 1.25rem;
    font-weight: 800;
    letter-spacing: -0.01em;
    text-transform: uppercase;
    text-align: center;
    line-height: 1.1;
}

p.subtitle {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

/* Admin Upload Styles */
.upload-zone {
    border: 2px dashed var(--glass-border);
    border-radius: 16px;
    padding: 3rem 2rem;
    margin-bottom: 2rem;
    transition: var(--transition-smooth);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.upload-zone:hover {
    border-color: #6366f1;
    background: rgba(99, 102, 241, 0.05);
}

.upload-zone i {
    font-size: 3rem;
    margin-bottom: 1rem;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

input[type="file"] {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    opacity: 0;
    cursor: pointer;
}

.btn-primary {
    background: var(--primary-gradient);
    border: none;
    color: white;
    padding: 0.8rem 2rem;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition-smooth);
    box-shadow: 0 4px 14px 0 rgba(99, 102, 241, 0.39);
}

.btn-primary:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.45);
}

/* QR Code Display */
#qrcode {
    background: white;
    padding: 1.5rem;
    border-radius: 16px;
    display: inline-block;
    margin: 2rem auto;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
}

.qr-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 1.5rem;
}

.footer {
    margin-top: auto;
    padding: 2rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    opacity: 0.7;
}

.btn-whatsapp {
    background: #25d366;
    color: white;
    padding: 0.8rem 1.5rem;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: var(--transition-smooth);
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 14px 0 rgba(37, 211, 102, 0.3);
}

.btn-whatsapp:hover {
    background: #128c7e;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 211, 102, 0.4);
}

/* UI Polishing */
.input-control {
    width: 100%;
    padding: 1rem;
    border-radius: 14px;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--glass-border);
    color: white;
    font-size: 1rem;
    transition: var(--transition-smooth);
    outline: none;
}

.input-control:focus {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 0 4px rgba(34, 211, 238, 0.1);
    background: rgba(15, 23, 42, 0.8);
}

.auth-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2.5rem;
    gap: 1rem;
}

.logout-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: #ef4444;
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    border: 1.5px solid rgba(239, 68, 68, 0.2);
    padding: 0.5rem 1.2rem;
    border-radius: 10px;
    transition: var(--transition-smooth);
}

.logout-btn:hover {
    background: rgba(239, 68, 68, 0.1);
    border-color: #ef4444;
}

.section-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 3rem 0 1.5rem 0;
    text-align: left;
}

.section-header h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    white-space: nowrap;
}

.section-line {
    height: 1px;
    background: var(--glass-border);
    flex-grow: 1;
}

/* Responsive */
@media (max-width: 640px) {
    .glass-container {
        padding: 1.5rem;
        margin-top: 2rem;
    }
    h1 { font-size: 1.8rem; }
}