/* CSS Variables */
:root {
    /* Colors */
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #06b6d4;

    /* Text Colors */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;

    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-dark: #0f172a;

    /* Border Colors */
    --border-color: #e2e8f0;
    --border-focus: #3b82f6;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 200ms ease-in-out;
    --transition-slow: 300ms ease-in-out;
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
                 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
                 sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    color: var(--text-primary);
    line-height: 1.6;
    background-color: var(--bg-secondary);
}

/* Login Page Styles */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    background: #0f172a;
}

/* Background */
.login-background {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
}

.bg-slide {
    position: absolute;
    inset: 0;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    opacity: 0;
    transform: scale(1.02);
    transition: opacity 1.2s ease, transform 8s ease;
    will-change: opacity, transform;
}

.bg-slide.is-active {
    opacity: 1;
    transform: scale(1.08);
}

.bg-slide-a {
    background-image: url('/frontend/assets/login-bg-1.jpg');
}

.bg-slide-b {
    background-image: url('/frontend/assets/login-bg-2.jpg');
}

.bg-mask {
    position: absolute;
    inset: 0;
    background: linear-gradient(120deg, rgba(15, 23, 42, 0.06) 0%, rgba(15, 23, 42, 0.02) 55%, rgba(15, 23, 42, 0.08) 100%);
}

.gradient-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 14% 18%, rgba(59, 130, 246, 0.12), transparent 34%),
        radial-gradient(circle at 88% 20%, rgba(14, 165, 233, 0.08), transparent 30%);
    opacity: 1;
}

.pattern-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
    animation: patternMove 20s ease-in-out infinite;
}

@keyframes patternMove {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(2deg); }
}

/* Login Container */
.login-container {
    position: relative;
    z-index: 1;
    display: flex;
    width: 100%;
    max-width: 1200px;
    margin: 0 var(--spacing-lg);
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.10);
    border-radius: var(--radius-xl);
    box-shadow: 0 26px 60px rgba(2, 6, 23, 0.10);
    overflow: hidden;
    min-height: 600px;
    backdrop-filter: none;
}

/* Left Info Section */
.login-info {
    flex: 1;
    background: linear-gradient(145deg, rgba(30, 41, 59, 0.25), rgba(37, 99, 235, 0.18));
    padding: var(--spacing-2xl);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    position: relative;
    overflow: hidden;
}

.login-info::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    animation: rotate 30s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.info-content {
    position: relative;
    z-index: 1;
    max-width: 450px;
    text-shadow: 0 2px 20px rgba(2, 6, 23, 0.35);
}

.system-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    line-height: 1.2;
}

.system-subtitle {
    font-size: 1rem;
    opacity: 0.9;
    margin-bottom: var(--spacing-2xl);
    font-weight: 300;
    letter-spacing: 0.5px;
}

.feature-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.feature-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 1rem;
    opacity: 0.95;
    transition: all var(--transition-base);
}

.feature-item:hover {
    opacity: 1;
    transform: translateX(5px);
}

.feature-item svg {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
}

/* Right Form Section */
.login-form-wrapper {
    flex: 1;
    padding: var(--spacing-2xl);
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(248, 250, 252, 0.06);
}

.login-form-card {
    width: 100%;
    max-width: 420px;
    padding: 28px 26px 24px;
    background: rgba(255, 255, 255, 0.86);
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.65);
    box-shadow: 0 22px 44px rgba(15, 23, 42, 0.18);
    backdrop-filter: blur(12px);
}

.login-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.login-header h2 {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.login-header p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Form Styles */
.login-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-wrapper .input-icon {
    position: absolute;
    left: var(--spacing-md);
    color: var(--text-light);
    pointer-events: none;
}

.input-wrapper input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-md);
    padding-left: 2.75rem;
    font-size: 0.9375rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: all var(--transition-base);
}

.input-wrapper input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.input-wrapper input::placeholder {
    color: var(--text-light);
}

/* Password Toggle */
.toggle-password {
    position: absolute;
    right: var(--spacing-md);
    background: none;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.toggle-password:hover {
    color: var(--text-secondary);
    background: var(--bg-secondary);
}

/* Captcha */
.captcha-wrapper {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.captcha-wrapper input {
    flex: 1;
    padding: var(--spacing-md);
    font-size: 0.9375rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: all var(--transition-base);
}

.captcha-wrapper input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.captcha-wrapper img,
.captcha-wrapper .captcha-display {
    height: 42px;
    padding: 4px 6px;
    border-radius: var(--radius-md);
    cursor: pointer;
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    overflow: hidden;
    background: var(--bg-secondary);
    min-width: 120px;
    user-select: none;
}

.captcha-wrapper .captcha-display .captcha-char {
    min-width: 22px;
    padding: 4px 0;
    border-radius: 6px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    text-align: center;
    font-size: 16px;
    font-weight: 700;
    line-height: 1.1;
    box-shadow: 0 4px 10px rgba(102, 126, 234, 0.25);
    flex: 0 0 auto;
}

.captcha-wrapper img:hover,
.captcha-wrapper .captcha-display:hover {
    border-color: var(--primary-color);
    background: var(--bg-tertiary);
}

/* Form Options */
.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    cursor: pointer;
    color: var(--text-secondary);
    user-select: none;
}

.checkbox-label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

.forgot-password {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.forgot-password:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* Login Button */
.login-btn {
    width: 100%;
    padding: var(--spacing-md);
    font-size: 1rem;
    font-weight: 600;
    color: white;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.login-btn::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;
}

.login-btn:hover::before {
    left: 100%;
}

.login-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

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

.login-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.spinner {
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Footer */
.login-footer {
    text-align: center;
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.login-footer p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-xs);
}

.register-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition-fast);
}

.register-link:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

.admin-login-link {
    font-size: 0.8125rem;
}

.admin-login-link a {
    color: var(--text-light);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.admin-login-link a:hover {
    color: var(--primary-color);
}

/* Toast */
.toast {
    position: fixed;
    top: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%) translateY(-100px);
    background: white;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    z-index: 1000;
    opacity: 0;
    transition: all var(--transition-slow);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.toast-icon {
    flex-shrink: 0;
}

.toast.success .toast-icon {
    color: var(--success-color);
}

.toast.error .toast-icon {
    color: var(--danger-color);
}

.toast.warning .toast-icon {
    color: var(--warning-color);
}

.toast.info .toast-icon {
    color: var(--info-color);
}

.toast-message {
    font-size: 0.9375rem;
    color: var(--text-primary);
    font-weight: 500;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .login-container {
        flex-direction: column;
        margin: var(--spacing-md);
        min-height: 0;
    }

    .login-info {
        padding: var(--spacing-xl) var(--spacing-lg);
    }

    .system-title {
        font-size: 2rem;
    }

    .login-form-wrapper {
        padding: var(--spacing-xl) var(--spacing-lg);
    }
}

@media (max-width: 640px) {
    .login-container {
        margin: 0;
        border-radius: 0;
        min-height: 100vh;
        min-height: 100dvh;
        backdrop-filter: none;
        border: 0;
        flex-direction: column;
    }

    .login-info {
        padding: 24px 20px;
        min-height: 0;
        flex: 0 0 auto;
    }

    .login-info::before { display: none; }

    .system-title {
        font-size: 1.4rem;
        margin-bottom: 4px;
    }

    .system-subtitle {
        font-size: 0.8rem;
        margin-bottom: 14px;
    }

    .feature-list {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
    }

    .feature-item {
        font-size: 0.8rem;
        gap: 6px;
    }

    .feature-item svg {
        width: 18px;
        height: 18px;
    }

    .login-form-wrapper {
        padding: 20px 18px 28px;
        flex: 1 1 auto;
    }

    .login-form-card {
        padding: 22px 18px 20px;
        border-radius: 18px;
    }

    .login-header h2 {
        font-size: 1.4rem;
    }

    .login-header p {
        font-size: 0.8rem;
    }

    .captcha-wrapper {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
    }

    .captcha-wrapper img,
    .captcha-wrapper .captcha-display {
        width: 100%;
        min-height: 38px;
    }

    .login-footer {
        margin-top: 16px;
    }

    .login-footer p {
        font-size: 0.85rem;
    }
}