/* ============================================
   2FA Code Generator - Modern Blue/White Theme
   Dark Mode Support
   ============================================ */

:root {
    /* Light theme - Blue/White */
    --bg-primary: #F8FAFC;
    --bg-card: #FFFFFF;
    --bg-input: #FFFFFF;
    --bg-button: #3B82F6;
    --bg-button-hover: #2563EB;
    --bg-secondary: #EFF6FF;
    
    --text-primary: #0F172A;
    --text-secondary: #64748B;
    --text-on-button: #FFFFFF;
    
    --border-color: #E2E8F0;
    --border-focus: #3B82F6;
    
    --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-hover: 0 4px 6px rgba(0, 0, 0, 0.1), 0 2px 4px rgba(0, 0, 0, 0.06);
    
    --accent-success: #10B981;
    --accent-error: #EF4444;
    --accent-info: #3B82F6;
    
    --code-bg: #EFF6FF;
    --code-text: #1E40AF;
    --progress-bg: #E0E7FF;
    --progress-fill: #3B82F6;
}

[data-theme="dark"] {
    /* Dark theme - Deep Navy/Slate */
    --bg-primary: #0F172A;
    --bg-card: #1E293B;
    --bg-input: #334155;
    --bg-button: #3B82F6;
    --bg-button-hover: #60A5FA;
    --bg-secondary: #334155;
    
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --text-on-button: #FFFFFF;
    
    --border-color: #475569;
    --border-focus: #60A5FA;
    
    --shadow-card: 0 4px 6px rgba(0, 0, 0, 0.3), 0 2px 4px rgba(0, 0, 0, 0.2);
    --shadow-hover: 0 10px 15px rgba(0, 0, 0, 0.4), 0 4px 6px rgba(0, 0, 0, 0.2);
    
    --accent-success: #34D399;
    --accent-error: #F87171;
    --accent-info: #60A5FA;
    
    --code-bg: #1E3A8A;
    --code-text: #93C5FD;
    --progress-bg: #334155;
    --progress-fill: #60A5FA;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', 'SF Pro Display', 
                 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* ============================================
   Top Controls (Language & Theme)
   ============================================ */
.top-controls {
    position: fixed;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 12px;
    z-index: 1000;
}

/* Language Switcher */
.lang-switcher {
    position: relative;
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-card);
}

.lang-btn:hover {
    border-color: var(--border-focus);
    box-shadow: var(--shadow-hover);
}

.lang-btn svg {
    flex-shrink: 0;
}

.lang-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 160px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-hover);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.2s ease;
    overflow: hidden;
}

.lang-switcher:hover .lang-dropdown,
.lang-dropdown:hover {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-item {
    display: block;
    padding: 10px 16px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 14px;
    transition: background-color 0.2s ease;
}

.lang-item:hover {
    background: var(--bg-secondary);
}

.lang-item.active {
    background: var(--accent-info);
    color: var(--text-on-button);
    font-weight: 600;
}

/* Theme Toggle */
.theme-toggle {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-card);
}

.theme-toggle:hover {
    border-color: var(--border-focus);
    box-shadow: var(--shadow-hover);
    transform: rotate(15deg);
}

.theme-toggle svg {
    color: var(--text-primary);
    transition: opacity 0.2s ease;
}

[data-theme="light"] .icon-moon {
    display: none;
}

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

/* ============================================
   Main Container
   ============================================ */
.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 100px 24px 40px;
    width: 100%;
}

/* Tab Navigation */
.tabs {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 32px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0;
}

.tab-btn {
    padding: 14px 28px;
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    margin-bottom: -2px;
}

.tab-btn:hover {
    color: var(--text-primary);
    background: var(--bg-secondary);
    border-radius: 8px 8px 0 0;
}

.tab-btn.active {
    color: var(--accent-info);
    border-bottom-color: var(--accent-info);
}

/* Tab Panel */
.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

/* Header */
.header {
    text-align: center;
    margin-bottom: 40px;
}

.brand {
    font-size: 42px;
    font-weight: 700;
    color: var(--accent-info);
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 480px;
    margin: 0 auto;
}

/* Main Card */
.main-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
    box-shadow: var(--shadow-card);
    transition: box-shadow 0.3s ease;
}

.main-card:hover {
    box-shadow: var(--shadow-hover);
}

/* ============================================
   Input Section
   ============================================ */
.input-section {
    margin-bottom: 32px;
}

.input-label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.input-group {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
}

.secret-input {
    flex: 1;
    padding: 12px 16px;
    font-size: 15px;
    font-family: 'SF Mono', 'Monaco', 'Menlo', 'Courier New', monospace;
    background: var(--bg-input);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    transition: all 0.2s ease;
    letter-spacing: 0.05em;
}

.secret-input:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.secret-input::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

.btn-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--text-secondary);
}

.btn-icon:hover {
    background: var(--bg-button);
    border-color: var(--bg-button);
    color: var(--text-on-button);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

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

/* Checkbox */
.checkbox-wrapper {
    margin-bottom: 12px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--text-secondary);
    cursor: pointer;
    user-select: none;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--accent-info);
}

/* Status Message */
.status-message {
    font-size: 13px;
    padding: 10px 14px;
    border-radius: 6px;
    display: none;
    animation: slideIn 0.3s ease;
}

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

.status-message.info {
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent-info);
    border-left: 3px solid var(--accent-info);
}

.status-message.success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--accent-success);
    border-left: 3px solid var(--accent-success);
}

.status-message.error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--accent-error);
    border-left: 3px solid var(--accent-error);
}

/* ============================================
   Code Display Section
   ============================================ */
.code-section {
    text-align: center;
}

.code-label {
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.code-display {
    background: var(--code-bg);
    padding: 24px;
    border-radius: 12px;
    margin-bottom: 24px;
    position: relative;
    border: 2px solid var(--border-color);
}

.code-digits {
    font-size: 48px;
    font-weight: 700;
    font-family: 'SF Mono', 'Monaco', 'Menlo', 'Courier New', monospace;
    color: var(--code-text);
    letter-spacing: 0.15em;
    display: block;
    margin-bottom: 16px;
}

.copy-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--bg-button);
    color: var(--text-on-button);
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.copy-btn:hover:not(:disabled) {
    background: var(--bg-button-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.copy-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.copy-btn:active:not(:disabled) {
    transform: translateY(0);
}

/* Timer Bar */
.timer-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
}

.progress-ring {
    position: relative;
    width: 48px;
    height: 48px;
}

.progress-ring svg {
    transform: rotate(-90deg);
}

.progress-bg {
    fill: none;
    stroke: var(--progress-bg);
    stroke-width: 3;
}

.progress-fill {
    fill: none;
    stroke: var(--progress-fill);
    stroke-width: 3;
    stroke-linecap: round;
    stroke-dasharray: 125.6;
    stroke-dashoffset: 0;
    transition: stroke-dashoffset 0.3s linear;
}

.timer-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 16px;
    font-weight: 700;
    font-family: 'SF Mono', 'Monaco', monospace;
    color: var(--text-primary);
}

.timer-label {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    margin-top: 40px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
    max-width: 520px;
    margin: 0 auto;
}

/* ============================================
   FB Check Section
   ============================================ */
.fb-check-section {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.section-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.section-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.uid-textarea {
    width: 100%;
    min-height: 180px;
    padding: 14px 16px;
    font-size: 14px;
    font-family: 'SF Mono', 'Monaco', 'Menlo', 'Courier New', monospace;
    background: var(--bg-input);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    resize: vertical;
    transition: all 0.2s ease;
    line-height: 1.6;
}

.uid-textarea:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.uid-textarea::placeholder {
    color: var(--text-secondary);
    opacity: 0.5;
}

.uid-textarea.input-error {
    border-color: var(--accent-error);
    animation: shake 0.3s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-4px); }
    75% { transform: translateX(4px); }
}

.button-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.btn-primary,
.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-primary {
    background: var(--bg-button);
    color: var(--text-on-button);
}

.btn-primary:hover:not(:disabled) {
    background: var(--bg-button-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-input);
    border-color: var(--border-focus);
}

.btn-primary:disabled,
.btn-secondary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary:active:not(:disabled),
.btn-secondary:active:not(:disabled) {
    transform: translateY(0);
}

/* Results Section */
.results-section {
    margin-top: 24px;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    flex-wrap: wrap;
    gap: 12px;
}

.results-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
}

.results-stats {
    font-size: 13px;
    color: var(--text-secondary);
    padding: 6px 12px;
    background: var(--bg-secondary);
    border-radius: 6px;
}

/* Dual-column results layout */
.results-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.result-column {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    background: var(--bg-primary);
    display: flex;
    flex-direction: column;
    min-height: 200px;
}

.column-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--border-color);
}

.column-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
}

.column-count {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 24px;
    height: 24px;
    padding: 0 8px;
    background: var(--bg-secondary);
    border-radius: 12px;
    font-size: 12px;
    font-weight: 700;
    color: var(--text-primary);
}

.accounts-list {
    flex: 1;
    overflow-y: auto;
    margin-bottom: 12px;
    max-height: 400px;
}

.account-item {
    padding: 10px 12px;
    margin-bottom: 6px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', 'Droid Sans Mono', monospace;
    font-size: 13px;
    color: var(--text-primary);
    transition: all 0.2s ease;
}

.account-item:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent-info);
}

.account-item:last-child {
    margin-bottom: 0;
}

.copy-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 14px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.copy-btn:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent-info);
    color: var(--accent-info);
}

.copy-btn:active {
    transform: scale(0.97);
}

.copy-btn.copied {
    background: rgba(16, 185, 129, 0.15);
    border-color: var(--accent-success);
    color: var(--accent-success);
}

.copy-btn svg {
    width: 16px;
    height: 16px;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
}

.status-badge.alive {
    background: rgba(16, 185, 129, 0.15);
    color: var(--accent-success);
}

.status-badge.dead {
    background: rgba(239, 68, 68, 0.15);
    color: var(--accent-error);
}

.status-badge.error {
    background: rgba(251, 146, 60, 0.15);
    color: #F97316;
}

.status-badge.checking {
    background: rgba(59, 130, 246, 0.15);
    color: var(--accent-info);
}

.status-icon {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.status-badge.alive .status-icon {
    background: var(--accent-success);
}

.status-badge.dead .status-icon {
    background: var(--accent-error);
}

.status-badge.error .status-icon {
    background: #F97316;
}

.status-badge.checking .status-icon {
    background: var(--accent-info);
    animation: pulse 1.5s ease-in-out infinite;
}

/* Disclaimer */
.disclaimer {
    display: flex;
    gap: 12px;
    padding: 14px 16px;
    background: rgba(251, 146, 60, 0.1);
    border-left: 3px solid #F97316;
    border-radius: 6px;
    margin-top: 24px;
}

.disclaimer svg {
    flex-shrink: 0;
    color: #F97316;
    margin-top: 2px;
}

.disclaimer p {
    font-size: 13px;
    line-height: 1.6;
    color: var(--text-secondary);
    margin: 0;
}

/* ============================================
   Animations
   ============================================ */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.6;
    }
}

.pulse {
    animation: pulse 1s ease-in-out infinite;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 640px) {
    .container {
        padding: 100px 16px 32px;
    }
    
    .top-controls {
        top: 12px;
        right: 12px;
        gap: 8px;
    }
    
    .brand {
        font-size: 32px;
    }
    
    .subtitle {
        font-size: 14px;
    }
    
    .main-card {
        padding: 24px;
        border-radius: 12px;
    }
    
    .code-digits {
        font-size: 36px;
    }
    
    .input-group {
        flex-wrap: wrap;
    }
    
    .secret-input {
        width: 100%;
        font-size: 14px;
    }
    
    .tab-btn {
        padding: 12px 16px;
        font-size: 14px;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .btn-primary,
    .btn-secondary {
        width: 100%;
        justify-content: center;
    }
    
    .results-columns {
        grid-template-columns: 1fr;
    }
    
    .accounts-list {
        max-height: 300px;
    }
}

/* ============================================
   Floating Ad Banner
   ============================================ */
.floating-ad {
    position: fixed;
    right: 20px;
    bottom: 20px;
    z-index: 9999;
    width: 140px;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
    overflow: visible;
    animation: floatingAdIn 0.4s ease-out;
}

.floating-ad a {
    display: block;
    border-radius: 12px;
    overflow: hidden;
    line-height: 0;
}

.floating-ad img {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 12px;
}

.floating-ad .ad-close {
    position: absolute;
    top: -10px;
    right: -10px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--bg-primary, #fff);
    color: var(--text-primary, #333);
    border: 1px solid var(--border-color, rgba(0, 0, 0, 0.15));
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    padding: 0;
    z-index: 10000;
    transition: transform 0.15s ease, background 0.15s ease;
}

.floating-ad .ad-close:hover {
    transform: scale(1.1);
    background: var(--bg-secondary, #f0f0f0);
}

@keyframes floatingAdIn {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@media (max-width: 480px) {
    .floating-ad {
        width: 100px;
        right: 12px;
        bottom: 12px;
    }
}

/* ============================================
   Accessibility
   ============================================ */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

:focus-visible {
    outline: 2px solid var(--border-focus);
    outline-offset: 2px;
}

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