/* ============ GLOBAL STYLES & VARIABLES ============ */
:root {
    --primary: #6c5ce7;
    --secondary: #a29bfe;
    --dark: #2d3436;
    --light: #f8f9fa;
    --success: #00b894;
    --danger: #d63031;
    --warning: #fdcb6e;
    --glass: rgba(255, 255, 255, 0.1);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
    padding: 20px;
}

/* Animated Background */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.bg-animation span {
    position: absolute;
    display: block;
    width: 20px;
    height: 20px;
    background: rgba(255, 255, 255, 0.2);
    animation: float 25s infinite;
    bottom: -150px;
    border-radius: 50%;
}

.bg-animation span:nth-child(1) { left: 25%; width: 80px; height: 80px; animation-delay: 0s; }
.bg-animation span:nth-child(2) { left: 10%; width: 20px; height: 20px; animation-delay: 2s; animation-duration: 12s; }
.bg-animation span:nth-child(3) { left: 70%; width: 20px; height: 20px; animation-delay: 4s; }
.bg-animation span:nth-child(4) { left: 40%; width: 60px; height: 60px; animation-delay: 0s; animation-duration: 18s; }
.bg-animation span:nth-child(5) { left: 65%; width: 20px; height: 20px; animation-delay: 0s; }
.bg-animation span:nth-child(6) { left: 75%; width: 110px; height: 110px; animation-delay: 3s; }
.bg-animation span:nth-child(7) { left: 35%; width: 150px; height: 150px; animation-delay: 7s; }
.bg-animation span:nth-child(8) { left: 50%; width: 25px; height: 25px; animation-delay: 15s; animation-duration: 45s; }
.bg-animation span:nth-child(9) { left: 20%; width: 15px; height: 15px; animation-delay: 2s; animation-duration: 35s; }
.bg-animation span:nth-child(10) { left: 85%; width: 150px; height: 150px; animation-delay: 0s; animation-duration: 11s; }

@keyframes float {
    0% { transform: translateY(0) rotate(0deg); opacity: 1; border-radius: 0; }
    100% { transform: translateY(-1000px) rotate(720deg); opacity: 0; border-radius: 50%; }
}

.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
}

.btn {
    padding: 12px 20px;
    border: none;
    border-radius: 15px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    width: 100%;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(108, 92, 231, 0.4);
}

.btn-success {
    background: linear-gradient(135deg, var(--success), #55efc4);
    color: white;
    width: 100%;
}

.btn-logout {
    width: auto;
    padding: 8px 20px;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    font-size: 0.9em;
}

.hidden {
    display: none !important;
}

.visible {
    display: block !important;
}

.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 15px 25px;
    border-radius: 10px;
    color: white;
    font-weight: 600;
    z-index: 1000;
    animation: slideInRight 0.5s ease, fadeOut 0.5s ease 2.5s forwards;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    max-width: 400px;
    word-wrap: break-word;
}

.notification-success { background: var(--success); }
.notification-error { background: var(--danger); }

@keyframes slideInRight {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(50px); }
    to { opacity: 1; transform: translateY(0); }
}