/* Liquid Glass Design - iOS 26 Inspired */
:root {
    --primary-color: #007AFF;
    --primary-hover: #0051D5;
    --secondary-color: #5856D6;
    --success-color: #34C759;
    --error-color: #FF3B30;
    --warning-color: #FF9500;
    
    --bg-primary: #F2F2F7;
    --bg-secondary: #FFFFFF;
    --bg-glass: rgba(255, 255, 255, 0.72);
    --bg-glass-hover: rgba(255, 255, 255, 0.85);
    
    --text-primary: #000000;
    --text-secondary: #3C3C43;
    --text-tertiary: #8E8E93;
    
    --border-color: rgba(0, 0, 0, 0.08);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    
    --radius-sm: 12px;
    --radius-md: 16px;
    --radius-lg: 24px;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

a {
    color: var(--bg-glass);
    text-decoration: none;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 
                 'Microsoft YaHei', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 16px;
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 16px;
    padding: 20px 20px;
    background: var(--bg-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0) 100%);
    pointer-events: none;
}

.header h1 {
    font-size: clamp(20px, 4vw, 26px);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 6px;
    letter-spacing: -0.5px;
    position: relative;
}

.subtitle {
    font-size: clamp(12px, 2.5vw, 14px);
    color: var(--text-secondary);
    font-weight: 500;
    position: relative;
}

.language-switch {
    margin-top: 12px;
    position: relative;
}

.lang-btn {
    display: inline-block;
    padding: 5px 14px;
    background: rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(10px);
    border-radius: 14px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 12px;
    font-weight: 600;
    transition: var(--transition);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.lang-btn:hover {
    background: rgba(255, 255, 255, 0.7);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Main Content */
.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

/* Card */
.card {
    background: var(--bg-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-radius: var(--radius-sm);
    padding: clamp(18px, 3vw, 22px);
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0) 100%);
    pointer-events: none;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.section-title {
    font-size: clamp(16px, 3vw, 19px);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 14px;
    letter-spacing: -0.3px;
    position: relative;
}

/* Form Elements */
.form-group {
    margin-bottom: 12px;
    position: relative;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 5px;
}

.input-field {
    width: 100%;
    padding: 10px 14px;
    font-size: 14px;
    border: 2px solid rgba(0, 0, 0, 0.1);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.9);
    color: var(--text-primary);
    transition: var(--transition);
    font-family: inherit;
}

.input-field:focus {
    outline: none;
    border-color: var(--primary-color);
    background: rgba(255, 255, 255, 1);
    box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.1);
}

.input-field::placeholder {
    color: var(--text-tertiary);
}

/* Buttons */
.primary-btn,
.secondary-btn {
    width: 100%;
    padding: 11px 18px;
    font-size: 14px;
    font-weight: 600;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-family: inherit;
    position: relative;
    overflow: hidden;
}

.primary-btn {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 4px 12px rgba(0, 122, 255, 0.3);
}

.primary-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 122, 255, 0.4);
}

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

.secondary-btn {
    background: var(--secondary-color);
    color: white;
    box-shadow: 0 4px 12px rgba(88, 86, 214, 0.3);
}

.secondary-btn:hover {
    background: #4745C7;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(88, 86, 214, 0.4);
}

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

.btn-icon {
    font-size: 16px;
}

.icon-btn {
    background: rgba(0, 122, 255, 0.1);
    border: none;
    padding: 8px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 18px;
    transition: var(--transition);
}

.icon-btn:hover {
    background: rgba(0, 122, 255, 0.2);
    transform: scale(1.05);
}

/* Result Card */
.result-card {
    margin-top: 14px;
    padding: 16px;
    background: rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(10px);
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.4);
    animation: slideIn 0.4s ease-out;
    position: relative;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.result-header h3 {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary);
}

.id-number {
    font-size: clamp(16px, 3vw, 19px);
    font-weight: 700;
    color: var(--primary-color);
    text-align: center;
    padding: 12px;
    background: rgba(0, 122, 255, 0.08);
    border-radius: 10px;
    margin-bottom: 14px;
    letter-spacing: 1px;
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
    word-break: break-all;
}

/* Info Grid */
.info-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: 3px;
    padding: 10px 12px;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 8px;
    transition: var(--transition);
}

.info-item:hover {
    background: rgba(255, 255, 255, 0.8);
    transform: translateY(-2px);
}

.info-item.full-width {
    grid-column: 1 / -1;
}

.info-label {
    font-size: 10px;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.info-value {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

/* Validate Status */
.validate-status {
    padding: 10px 14px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
    text-align: center;
    margin-bottom: 12px;
}

.validate-status.valid {
    background: rgba(52, 199, 89, 0.15);
    color: var(--success-color);
    border: 2px solid rgba(52, 199, 89, 0.3);
}

.validate-status.invalid {
    background: rgba(255, 59, 48, 0.15);
    color: var(--error-color);
    border: 2px solid rgba(255, 59, 48, 0.3);
}

/* Toast */
.toast {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(-100px);
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(20px);
    color: white;
    padding: 16px 24px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
    max-width: 90%;
}

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

/* Footer */
.footer {
    text-align: center;
    padding: 20px 20px 16px;
    margin-top: 20px;
    color: rgba(255, 255, 255, 0.9);
    font-size: 12px;
    font-weight: 500;
}

.footer p {
    margin-bottom: 12px;
}

.footer-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 16px;
    margin-top: 12px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    font-size: 12px;
    transition: var(--transition);
}

.footer-links a:hover {
    color: rgba(255, 255, 255, 1);
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 900px) {
    .main-content {
        grid-template-columns: 1fr;
        gap: 16px;
    }
}

@media (max-width: 768px) {
    body {
        padding: 12px;
    }
    
    .header {
        padding: 20px 16px;
        margin-bottom: 16px;
    }
    
    .card {
        padding: 18px;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
    }
    
    .id-number {
        font-size: 18px;
        padding: 14px;
        letter-spacing: 1px;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 24px;
    }
    
    .subtitle {
        font-size: 14px;
    }
    
    .section-title {
        font-size: 20px;
    }
    
    .primary-btn,
    .secondary-btn {
        padding: 14px 20px;
        font-size: 16px;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #1C1C1E;
        --bg-secondary: #2C2C2E;
        --bg-glass: rgba(28, 28, 30, 0.72);
        --bg-glass-hover: rgba(28, 28, 30, 0.85);
        
        --text-primary: #FFFFFF;
        --text-secondary: #EBEBF5;
        --text-tertiary: #8E8E93;
        
        --border-color: rgba(255, 255, 255, 0.1);
    }
    
    .input-field {
        background: rgba(28, 28, 30, 0.6);
        border-color: rgba(255, 255, 255, 0.1);
        color: var(--text-primary);
    }
    
    .input-field:focus {
        background: rgba(28, 28, 30, 0.8);
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Print Styles */
@media print {
    body {
        background: white;
    }
    
    .header,
    .card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
    
    .primary-btn,
    .secondary-btn,
    .language-switch {
        display: none;
    }
}