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

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    --card-bg: rgba(255, 255, 255, 0.95);
    --text-main: #1e293b;
    --text-muted: #64748b;
    --radius: 16px;
    --shadow: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

body {
    font-family: 'Inter', 'Sarabun', sans-serif;
    background: var(--bg-gradient);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    color: var(--text-main);
    overflow: hidden;
}

/* Background Animation */
body::before {
    content: "";
    position: absolute;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(37,99,235,0.15) 0%, rgba(37,99,235,0) 70%);
    top: -100px;
    right: -100px;
    z-index: -1;
}

body::after {
    content: "";
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(96,165,250,0.1) 0%, rgba(96,165,250,0) 70%);
    bottom: -150px;
    left: -150px;
    z-index: -1;
}

.login-container {
    background: var(--card-bg);
    padding: 48px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 420px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.2);
    animation: slideUp 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.logo-header {
    margin-bottom: 32px;
    text-align: center;
}

.header-logo {
    width: 90px;
    height: auto;
    margin-bottom: 16px;
    filter: drop-shadow(0 4px 6px rgba(0,0,0,0.1));
}

.logo {
    width: 80px;
    height: 80px;
    background: var(--primary);
    color: white;
    font-size: 32px;
    font-weight: 800;
    border-radius: 20px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    box-shadow: 0 10px 15px -3px rgba(37, 99, 235, 0.4);
}

h2 {
    font-size: 22px;
    font-weight: 800;
    color: #0f172a;
    margin: 0 0 4px 0;
    letter-spacing: -0.025em;
}

.logo-header p {
    color: var(--text-muted);
    font-size: 15px;
    margin: 0;
    font-weight: 500;
}

.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    color: #475569;
    font-weight: 600;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.input-group input {
    width: 100%;
    padding: 12px 16px;
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 10px;
    font-size: 16px;
    transition: all 0.2s;
    font-family: inherit;
}

.input-group input:focus {
    background: #fff;
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
}

button {
    width: 100%;
    padding: 14px;
    border: none;
    border-radius: 10px;
    background: var(--primary);
    color: white;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 4px 6px -1px rgba(37, 99, 235, 0.2);
    margin-top: 10px;
}

button:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 10px 15px -3px rgba(37, 99, 235, 0.3);
}

button:active {
    transform: translateY(0);
}

.extra-links {
    text-align: right;
    margin-top: 16px;
}

.extra-links a, .register-link a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    transition: color 0.2s;
}

.extra-links a:hover, .register-link a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

.register-link {
    text-align: center;
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid #f1f5f9;
    font-size: 14px;
    color: var(--text-muted);
}

.register-link p { margin: 8px 0; }

.error-message {
    background-color: #fee2e2;
    color: #991b1b;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
    font-weight: 500;
    border: 1px solid #fecaca;
}

.success-message {
    background-color: #dcfce7;
    color: #166534;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
    font-weight: 500;
    border: 1px solid #bbf7d0;
}