/* ============================================
   IBAN Validator - Premium Modern Styles
   ============================================ */

/* CSS Variables */
:root {
    /* Light Theme Colors */
    --bg-primary: #f8f9fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f3f5;
    --text-primary: #1a1a1a;
    --text-secondary: #6c757d;
    --text-tertiary: #adb5bd;
    --border-color: #e9ecef;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);

    /* Accent Colors */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --color-success: #10b981;
    --color-error: #ef4444;
    --color-warning: #f59e0b;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --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: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #64748b;
    --border-color: #334155;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    transition: background-color var(--transition-base), color var(--transition-base);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Theme Toggle Button */
/* Bottom Controls (Theme + Lang) */
.bottom-controls {
    position: fixed;
    bottom: 24px;
    right: 24px;
    display: flex;
    gap: 12px;
    z-index: 9999;
}

/* Theme Toggle Button */
.theme-toggle {
    width: 44px;
    height: 44px;
    border: none;
    border-radius: 50%;
    background: var(--bg-secondary);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
}

.theme-toggle:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
    border-color: #667eea;
    color: #667eea;
}

.theme-toggle:active {
    transform: translateY(0);
}

.theme-toggle .sun-icon {
    display: block;
}

.theme-toggle .moon-icon {
    display: none;
}

[data-theme="dark"] .theme-toggle .sun-icon {
    display: none;
}

[data-theme="dark"] .theme-toggle .moon-icon {
    display: block;
}

/* Language Toggle */
.lang-toggle {
    height: 44px;
    padding: 0 16px;
    border: none;
    border-radius: 22px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-weight: 700;
    font-size: 0.875rem;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
}

.lang-toggle:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
    border-color: #667eea;
    color: #667eea;
}

.lang-toggle:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Main Content */
.main-content {
    padding: var(--spacing-xl) 0 var(--spacing-2xl);
}

/* Validator Card */
.validator-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-2xl);
    transition: all var(--transition-base);
}

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

.card-header h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.card-header p {
    color: var(--text-secondary);
    font-size: 0.938rem;
}

/* Input Section */
.input-wrapper {
    margin-bottom: var(--spacing-2xl);
}

.input-wrapper label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.input-group {
    position: relative;
}

.iban-input {
    width: 100%;
    padding: var(--spacing-lg) var(--spacing-xl);
    padding-right: 56px;
    font-size: 1.125rem;
    font-family: 'Monaco', 'Courier New', monospace;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: all var(--transition-base);
    letter-spacing: 0.5px;
}

.iban-input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

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

.clear-btn {
    position: absolute;
    right: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    width: 32px;
    height: 32px;
    border: none;
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--text-tertiary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-base);
}

.clear-btn.visible {
    opacity: 1;
    pointer-events: auto;
}

.clear-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* Validation Message */
.validation-message {
    margin-top: var(--spacing-sm);
    font-size: 0.875rem;
    font-weight: 500;
    min-height: 20px;
}

.validation-message.error {
    color: var(--color-error);
}

.validation-message.success {
    color: var(--color-success);
}

/* Result Section */
.result-section {
    padding: var(--spacing-xl);
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
    transition: all var(--transition-base);
}

.result-section.hidden {
    display: none;
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.status-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 0.875rem;
    background: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
}

.status-badge.invalid {
    background: rgba(239, 68, 68, 0.1);
    color: var(--color-error);
}

.status-badge .check-icon {
    flex-shrink: 0;
}

.copy-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-base);
}

.copy-btn:hover {
    background: var(--gradient-primary);
    color: white;
    border-color: transparent;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Formatted IBAN Display */
.formatted-iban {
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 1.5rem;
    font-weight: 600;
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
    letter-spacing: 2px;
    word-break: break-all;
    color: var(--text-primary);
}

/* Info Grid */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--spacing-lg);
}

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

.info-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-tertiary);
}

.info-value {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Examples Section */
.examples-section {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-2xl);
    border-top: 1px solid var(--border-color);
}

.examples-title {
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-secondary);
}

.examples-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: var(--spacing-md);
}

.example-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-base);
}

.example-btn:hover {
    background: var(--gradient-primary);
    color: white;
    border-color: transparent;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.example-btn .flag {
    font-size: 1.5rem;
}

/* Info Cards */
.info-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.info-card {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    text-align: center;
}

.info-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.info-card-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto var(--spacing-lg);
    border-radius: var(--radius-lg);
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.info-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.info-card p {
    color: var(--text-secondary);
    font-size: 0.938rem;
    line-height: 1.6;
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    opacity: 0;
    transition: all var(--transition-base);
    z-index: 2000;
}

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

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

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .logo h1 {
        font-size: 1.5rem;
    }

    .tagline {
        font-size: 0.875rem;
    }

    .validator-card {
        padding: var(--spacing-xl);
    }

    .card-header h2 {
        font-size: 1.5rem;
    }

    .iban-input {
        font-size: 1rem;
        padding: var(--spacing-md) var(--spacing-lg);
    }

    .formatted-iban {
        font-size: 1.125rem;
        letter-spacing: 1px;
    }

    .info-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .examples-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .bottom-controls {
        bottom: 16px;
        right: 16px;
    }
}

@media (max-width: 480px) {
    .info-grid {
        grid-template-columns: 1fr;
    }

    .examples-grid {
        grid-template-columns: 1fr;
    }

    .result-header {
        flex-direction: column;
        align-items: stretch;
    }

    .copy-btn {
        justify-content: center;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-section {
    animation: fadeIn var(--transition-base);
}

/* Print Styles */
@media print {

    .theme-toggle,
    .lang-toggle,
    .copy-btn,
    .examples-section,
    .info-cards {
        display: none;
    }
}