@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: #818cf8;
    --bg-dark: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.95);
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: rgba(148, 163, 184, 0.2);
    --success: #10b981;
    --error: #ef4444;
}

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

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

body::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background:
        radial-gradient(circle at 20% 50%, rgba(120, 119, 198, 0.3), transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(138, 43, 226, 0.3), transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(30, 144, 255, 0.3), transparent 50%);
    animation: rotate 20s linear infinite;
    z-index: 0;
}

@keyframes rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

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

.login-box {
    background: var(--bg-card);
    backdrop-filter: blur(20px) saturate(180%);
    border-radius: 24px;
    padding: 48px 40px;
    box-shadow:
        0 20px 50px rgba(0, 0, 0, 0.4),
        0 0 0 1px rgba(255, 255, 255, 0.1) inset;
    animation: slideUp 0.6s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-box h1 {
    color: var(--text-primary);
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 8px;
    text-align: center;
    letter-spacing: -0.5px;
}

.login-box p {
    color: var(--text-secondary);
    font-size: 15px;
    text-align: center;
    margin-bottom: 40px;
    font-weight: 400;
}

.input-group {
    margin-bottom: 24px;
    position: relative;
}

.input-group label {
    display: block;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
    transition: color 0.3s ease;
}

.input-group input {
    width: 100%;
    padding: 14px 16px;
    background: rgba(15, 23, 42, 0.6);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    outline: none;
    color: var(--text-primary);
    font-size: 15px;
    font-weight: 400;
    transition: all 0.3s ease;
}

.input-group input::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

.input-group input:focus {
    border-color: var(--primary-color);
    background: rgba(15, 23, 42, 0.8);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

.input-group input:focus + label,
.input-group input:not(:placeholder-shown) + label {
    color: var(--primary-color);
}

button[type="submit"] {
    width: 100%;
    padding: 16px;
    background: var(--primary-color);
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 8px;
    position: relative;
    overflow: hidden;
}

button[type="submit"]::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

button[type="submit"]:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(99, 102, 241, 0.3);
}

button[type="submit"]:hover::before {
    left: 100%;
}

button[type="submit"]:active {
    transform: translateY(0);
}

.footer {
    margin-top: 32px;
    text-align: center;
}

.footer a {
    color: var(--primary-light);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.3s ease;
}

.footer a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

/* Error/Success messages */
.message {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
    font-weight: 500;
    display: none;
}

.message.error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error);
    border: 1px solid rgba(239, 68, 68, 0.3);
    display: block;
}

.message.success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
    border: 1px solid rgba(16, 185, 129, 0.3);
    display: block;
}

/* Loading state */
button[type="submit"]:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

button[type="submit"].loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    left: 50%;
    margin-left: -8px;
    margin-top: -8px;
    border: 2px solid transparent;
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Responsive */
@media (max-width: 480px) {
    .login-box {
        padding: 36px 24px;
    }

    .login-box h1 {
        font-size: 28px;
    }
}