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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #e0f2fe, #dbeafe, #eff6ff);
    color: #1f2937;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.navbar {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    padding: 0;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(59, 130, 246, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 30px;
    height: 70px;
}

.nav-logo {
    color: #3b82f6;
    font-size: 1.8rem;
    font-weight: 700;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-logo::before {
    content: "⚡";
    font-size: 2rem;
}

.nav-links {
    display: flex;
    gap: 20px;
}

.nav-links a {
    color: #6b7280;
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: #3b82f6;
}

.login-container {
    width: 100%;
    max-width: 420px;
    padding: 40px;
    margin-top: 70px;
}

.login-box {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(59, 130, 246, 0.15), 0 8px 24px rgba(0, 0, 0, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.8);
}

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

.login-logo {
    font-size: 2.5rem;
    font-weight: 700;
    color: #3b82f6;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.login-logo::before {
    content: "⚡";
}

.login-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 8px;
}

.login-subtitle {
    font-size: 0.9rem;
    color: #6b7280;
}

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

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: #374151;
    margin-bottom: 8px;
}

.form-input {
    width: 100%;
    padding: 14px 16px;
    font-size: 1rem;
    border: 2px solid #e5e7eb;
    border-radius: 12px;
    background: #f9fafb;
    color: #1f2937;
    transition: all 0.3s ease;
    outline: none;
}

.form-input:focus {
    border-color: #3b82f6;
    background: #fff;
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.form-input::placeholder {
    color: #9ca3af;
}

.login-btn {
    width: 100%;
    padding: 14px 24px;
    font-size: 1rem;
    font-weight: 600;
    color: #fff;
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 8px;
}

.login-btn:hover {
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(59, 130, 246, 0.3);
}

.login-btn:active {
    transform: translateY(0);
}

.login-btn:disabled {
    background: #9ca3af;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.error-message {
    background: #fef2f2;
    border: 1px solid #fecaca;
    color: #dc2626;
    padding: 12px 16px;
    border-radius: 10px;
    font-size: 0.875rem;
    margin-bottom: 20px;
    display: none;
}

.error-message.show {
    display: block;
}

.footer {
    text-align: center;
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid #e5e7eb;
}

.footer-link {
    color: #6b7280;
    font-size: 0.875rem;
    text-decoration: none;
}

.footer-link:hover {
    color: #3b82f6;
}

.back-home {
    text-align: center;
    margin-top: 20px;
}

.back-home a {
    color: #6b7280;
    text-decoration: none;
    font-size: 0.875rem;
    transition: color 0.3s ease;
}

.back-home a:hover {
    color: #3b82f6;
}

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #ffffff;
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 1s linear infinite;
    margin-right: 8px;
    vertical-align: middle;
}

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