/* ===== CSS Variables ===== */
:root {
    /* Colors - Deep Ocean Theme */
    --color-bg: #0a0e14;
    --color-bg-elevated: #111820;
    --color-bg-card: #161d27;
    --color-bg-hover: #1c2533;
    
    --color-coral: #FF6B4A;
    --color-coral-light: #FF8A70;
    --color-coral-dark: #E5523A;
    --color-coral-glow: rgba(255, 107, 74, 0.3);
    
    --color-success: #3fb950;
    --color-warning: #d29922;
    --color-info: #58a6ff;
    
    --color-text-primary: #F0F4F8;
    --color-text-secondary: #8BA3B8;
    --color-text-muted: #5C7080;
    
    --color-border: rgba(139, 163, 184, 0.15);
    --color-border-light: rgba(139, 163, 184, 0.08);
    
    /* Typography */
    --font-display: 'Instrument Serif', Georgia, serif;
    --font-body: 'Lexend', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 9999px;
}

/* ===== Reset ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--color-bg);
    min-height: 100vh;
}

/* ===== Navigation ===== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: var(--space-md) 0;
    background: rgba(10, 14, 20, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 500;
    font-size: 1rem;
    color: var(--color-text-primary);
    text-decoration: none;
}

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

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.nav-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--color-text-primary);
}

.nav-links a.active {
    font-weight: 500;
}

.nav-github {
    display: flex;
    align-items: center;
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-github:hover {
    background: var(--color-bg-hover);
}

/* ===== Main Content ===== */
.main {
    padding-top: calc(64px + var(--space-2xl));
    padding-bottom: var(--space-3xl);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

/* ===== Header ===== */
.app-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.header-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
}

.badge-icon {
    font-size: 1.25rem;
}

.app-header h1 {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 400;
    line-height: 1.1;
    margin-bottom: var(--space-md);
}

.header-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.7;
}

/* ===== App Grid ===== */
.app-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr 300px;
    gap: var(--space-xl);
    align-items: start;
}

/* ===== Input Section ===== */
.input-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
}

.input-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-md);
}

.input-header label {
    font-weight: 500;
    font-size: 0.9rem;
}

.char-count {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

#char-count {
    color: var(--color-text-secondary);
}

textarea {
    width: 100%;
    min-height: 300px;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    color: var(--color-text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    line-height: 1.6;
    resize: vertical;
    transition: border-color var(--transition-fast);
}

textarea:focus {
    outline: none;
    border-color: var(--color-coral);
}

textarea::placeholder {
    color: var(--color-text-muted);
}

.url-hint {
    margin-top: 0.5rem;
    padding: 0.5rem 0.75rem;
    font-size: 0.8rem;
    color: #FBBF24;
    background: rgba(251, 191, 36, 0.08);
    border: 1px solid rgba(251, 191, 36, 0.2);
    border-radius: 6px;
    line-height: 1.4;
}

.input-examples {
    margin: var(--space-lg) 0;
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border-light);
}

.examples-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    display: block;
    margin-bottom: var(--space-sm);
}

.example-buttons {
    display: flex;
    gap: var(--space-sm);
}

.example-btn {
    padding: var(--space-xs) var(--space-md);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-size: 0.8rem;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.example-btn:hover {
    border-color: var(--color-coral);
    color: var(--color-text-primary);
}

.analyze-btn {
    width: 100%;
    padding: var(--space-md) var(--space-xl);
    background: var(--color-coral);
    color: var(--color-bg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    transition: all var(--transition-base);
}

.analyze-btn:hover:not(:disabled) {
    background: var(--color-coral-light);
    transform: translateY(-2px);
    box-shadow: 0 8px 30px var(--color-coral-glow);
}

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

.analyze-btn.loading .btn-icon,
.analyze-btn.loading .btn-text {
    display: none;
}

.analyze-btn.loading .btn-spinner {
    display: block !important;
}

/* Spinner */
.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

/* ===== Results Section ===== */
.results-placeholder {
    background: var(--color-bg-card);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-3xl);
    text-align: center;
    color: var(--color-text-muted);
}

.placeholder-icon {
    font-size: 3rem;
    margin-bottom: var(--space-md);
    opacity: 0.5;
}

.results-placeholder h3 {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-sm);
}

/* Error State */
.results-error {
    background: var(--color-bg-card);
    border: 2px dashed rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-lg);
    padding: var(--space-3xl);
    text-align: center;
    animation: fadeIn 0.4s ease-out;
}

.results-error .error-icon {
    font-size: 3rem;
    margin-bottom: var(--space-md);
}

.results-error h3 {
    font-size: 1.25rem;
    color: #ef4444;
    margin-bottom: var(--space-sm);
}

.results-error p {
    color: var(--color-text-muted);
    line-height: 1.6;
    margin-bottom: var(--space-lg);
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

.retry-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.retry-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-accent);
}

.results-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
    animation: fadeIn 0.4s ease-out;
}

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

/* Classification */
.result-classification {
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--color-border-light);
}

.classification-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-full);
    font-size: 1.125rem;
    font-weight: 500;
    margin-bottom: var(--space-lg);
}

/*
 * Classification badge styles.
 * Internal CSS class names: autonomous = AI Generated, prompted = AI Revised, human = Human Written.
 * The JS maps API labels to these class names via transformApiResponse().
 */
.classification-badge.autonomous,
.classification-badge.ai_generated {
    background: rgba(52, 211, 153, 0.15);
    border: 1px solid rgba(52, 211, 153, 0.4);
    color: #34D399;
}

.classification-badge.prompted,
.classification-badge.ai_revised {
    background: rgba(251, 191, 36, 0.15);
    border: 1px solid rgba(251, 191, 36, 0.4);
    color: #FBBF24;
}

.classification-badge.human {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.4);
    color: #F87171;
}

.classification-icon {
    font-size: 1.25rem;
}

.confidence-meter {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.confidence-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.confidence-value {
    font-weight: 600;
    color: var(--color-text-primary);
}

.confidence-bar {
    height: 8px;
    background: var(--color-bg-elevated);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.confidence-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-coral) 0%, var(--color-coral-light) 100%);
    border-radius: var(--radius-full);
    transition: width 0.6s ease-out;
}

/* Detection Scores */
.result-scores h3 {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
}

.scores-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.score-item {
    display: grid;
    grid-template-columns: 100px 1fr 48px;
    align-items: center;
    gap: var(--space-sm);
}

.score-label {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    font-weight: 500;
}

.score-bar-container {
    height: 8px;
    background: var(--color-bg-elevated);
    border-radius: 4px;
    overflow: hidden;
}

.score-bar {
    height: 100%;
    border-radius: 4px;
    transition: width 0.6s ease;
    min-width: 0;
}

.score-bar-ai {
    background: linear-gradient(90deg, #ff6b6b, #ee5a24);
}

.score-bar-revised {
    background: linear-gradient(90deg, #ffa726, #f57c00);
}

.score-bar-human {
    background: linear-gradient(90deg, #66bb6a, #388e3c);
}

.score-value {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text);
    text-align: right;
}

.score-meta {
    display: flex;
    justify-content: space-between;
    margin-top: var(--space-sm);
    padding-top: var(--space-sm);
    border-top: 1px solid var(--color-border);
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

/* Indicators */
.result-indicators h3 {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
}

.indicators-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.indicator-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm);
    background: var(--color-bg-elevated);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
}

.indicator-item svg {
    flex-shrink: 0;
}

.indicator-positive {
    color: var(--color-success);
}

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

/* Smart CTA */
.result-cta {
    padding: var(--space-xl);
    background: linear-gradient(135deg, rgba(255, 107, 74, 0.1) 0%, rgba(255, 138, 112, 0.05) 100%);
    border: 1px solid rgba(255, 107, 74, 0.3);
    border-radius: var(--radius-lg);
}

.cta-content h3 {
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
}

.cta-content p {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
    line-height: 1.6;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    background: var(--color-coral);
    color: var(--color-bg);
    border-radius: var(--radius-md);
    font-weight: 500;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.cta-button:hover {
    background: var(--color-coral-light);
    transform: translateX(2px);
}

/* ===== Info Sidebar ===== */
.info-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.info-card h3,
.info-card h4 {
    font-size: 1rem;
    margin-bottom: var(--space-md);
}

.info-list {
    list-style: none;
    counter-reset: info-counter;
}

.info-list li {
    counter-increment: info-counter;
    margin-bottom: var(--space-lg);
}

.info-list li::before {
    content: counter(info-counter);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: var(--color-coral);
    color: var(--color-bg);
    border-radius: 50%;
    font-size: 0.75rem;
    font-weight: 600;
    margin-right: var(--space-sm);
    margin-bottom: var(--space-xs);
}

.info-list strong {
    display: block;
    margin-bottom: var(--space-xs);
    color: var(--color-text-primary);
}

.info-list span {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.check-list {
    list-style: none;
}

.check-list li {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.check-list svg {
    color: var(--color-coral);
    flex-shrink: 0;
}

.info-cta {
    background: linear-gradient(135deg, var(--color-bg-elevated) 0%, var(--color-bg-card) 100%);
}

.info-cta h4 {
    font-size: 0.95rem;
}

.info-cta p {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
}

.info-link {
    color: var(--color-coral);
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.info-link:hover {
    color: var(--color-coral-light);
}

/* ===== Certificate Button ===== */
.result-certificate {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.certificate-btn {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    width: 100%;
    padding: 1rem 1.5rem;
    background: rgba(255, 107, 74, 0.1);
    border: 1px solid rgba(255, 107, 74, 0.3);
    border-radius: 8px;
    color: #FF6B4A;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.certificate-btn:hover {
    background: rgba(255, 107, 74, 0.15);
    border-color: rgba(255, 107, 74, 0.5);
    transform: translateY(-1px);
}

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

/* ===== Certificate Modal ===== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    background: #0A1628;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    z-index: 1001;
    animation: modalSlideIn 0.3s ease;
}

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

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: rgba(255, 255, 255, 0.05);
    border: none;
    border-radius: 8px;
    padding: 0.5rem;
    color: rgba(255, 255, 255, 0.6);
    cursor: pointer;
    transition: all 0.2s ease;
    z-index: 1002;
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.9);
}

/* ===== Certificate Design ===== */
.certificate {
    padding: 2.5rem;
}

.certificate-header {
    text-align: center;
    padding-bottom: 2rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.certificate-logo {
    font-size: 3rem;
    margin-bottom: 1rem;
    animation: bounce 1s ease;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.certificate-header h2 {
    margin: 0 0 0.5rem;
    font-size: 1.75rem;
    font-family: 'Instrument Serif', serif;
    color: rgba(255, 255, 255, 0.95);
}

.certificate-subtitle {
    margin: 0;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
}

.certificate-body {
    padding: 2rem 0;
}

.certificate-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.5rem;
    border-radius: 100px;
    font-weight: 600;
    margin-bottom: 2rem;
    width: 100%;
    justify-content: center;
}

.certificate-badge.autonomous,
.certificate-badge.ai_generated {
    background: rgba(52, 211, 153, 0.1);
    border: 2px solid rgba(52, 211, 153, 0.3);
    color: #34D399;
}

.certificate-badge.prompted,
.certificate-badge.ai_revised {
    background: rgba(251, 191, 36, 0.1);
    border: 2px solid rgba(251, 191, 36, 0.3);
    color: #FBBF24;
}

.certificate-badge.human {
    background: rgba(239, 68, 68, 0.1);
    border: 2px solid rgba(239, 68, 68, 0.3);
    color: #F87171;
}

.cert-badge-icon {
    font-size: 1.25rem;
}

.certificate-details {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.cert-detail {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.02);
    border-radius: 8px;
}

.cert-detail-primary {
    padding: 1.25rem;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.cert-detail-primary .cert-value {
    font-size: 1.1rem;
    font-weight: 600;
}

.cert-detail-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
}

.cert-detail-small {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding: 0.875rem;
    background: rgba(255, 255, 255, 0.02);
    border-radius: 8px;
    text-align: center;
}

.cert-detail-small .cert-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.cert-detail-small .cert-value {
    font-size: 0.95rem;
    font-weight: 600;
}

.cert-label {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.5);
}

.cert-value {
    font-weight: 500;
    color: rgba(255, 255, 255, 0.9);
}

.cert-id {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    color: #FF6B4A;
}

.certificate-share {
    padding: 1.5rem;
    background: rgba(255, 107, 74, 0.08);
    border: 2px solid rgba(255, 107, 74, 0.3);
    border-radius: 12px;
    margin-top: 0.5rem;
}

.share-title {
    margin: 0 0 1rem;
    font-size: 1rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.95);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.share-link-container {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.share-link-input {
    flex: 1;
    padding: 0.875rem 1rem;
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 8px;
    color: rgba(255, 255, 255, 0.95);
    font-size: 0.875rem;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 500;
}

.copy-link-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    background: #FF6B4A;
    border: none;
    border-radius: 8px;
    color: white;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.copy-link-btn:hover {
    background: #E85A39;
    transform: translateY(-1px);
}

.copy-link-btn.copied {
    background: #34D399;
}

.tweet-cert-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.7rem 1rem;
    margin-top: 0.75rem;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 8px;
    color: #F0F4F8;
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
}

.tweet-cert-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
}

.share-hint {
    margin: 0.75rem 0 1rem;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.6);
    text-align: center;
}

.cert-id-display {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    margin-top: 0.75rem;
}

.cert-id-label {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.6);
}

.cert-id-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    font-weight: 600;
    color: #FF6B4A;
    letter-spacing: 0.05em;
}

.certificate-footer {
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.certificate-footer p {
    margin: 0 0 1rem;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.5);
}

.cert-learn-more {
    display: inline-flex;
    align-items: center;
    color: #FF6B4A;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: opacity 0.2s ease;
}

.cert-learn-more:hover {
    opacity: 0.8;
}

/* ===== Embed Badge ===== */
.certificate-embed {
    padding-top: 1.5rem;
    margin-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.certificate-embed .share-title {
    margin-bottom: 0.25rem;
}

.embed-hint {
    font-size: 0.82rem;
    color: rgba(255, 255, 255, 0.5);
    margin-bottom: 1rem;
}

.embed-preview {
    margin-bottom: 1rem;
    display: flex;
    justify-content: center;
}

.embed-tabs {
    display: flex;
    gap: 0;
    margin-bottom: 0;
}

.embed-tab {
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-bottom: none;
    color: #8BA3B8;
    font-size: 0.78rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s;
    border-radius: 8px 8px 0 0;
}

.embed-tab:first-child {
    border-right: none;
}

.embed-tab.active {
    background: rgba(255, 255, 255, 0.06);
    color: #F0F4F8;
    border-color: rgba(255, 255, 255, 0.12);
}

.embed-code-container {
    position: relative;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 0 8px 8px 8px;
    margin-bottom: 0.75rem;
}

.embed-code {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.72rem;
    line-height: 1.6;
    color: #C4D4E0;
    padding: 1rem;
    padding-right: 4rem;
    margin: 0;
    white-space: pre-wrap;
    word-break: break-all;
    overflow-x: auto;
}

.embed-code-container .copy-link-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    padding: 0.3rem 0.6rem;
    font-size: 0.72rem;
}

.embed-learn-more {
    display: inline-block;
    color: #FF6B4A;
    text-decoration: none;
    font-size: 0.82rem;
    font-weight: 500;
    transition: opacity 0.2s;
}

.embed-learn-more:hover {
    opacity: 0.8;
}

/* ===== Share Card + Claim ===== */
.certificate-card-share,
.certificate-claim {
    padding-top: 1.5rem;
    margin-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.card-preview-wrap {
    margin-bottom: 0.9rem;
}

.card-preview-img {
    width: 100%;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(255, 255, 255, 0.02);
}

.card-actions {
    display: flex;
    gap: 0.6rem;
    margin-top: 0.75rem;
}

.card-actions .tweet-cert-btn {
    flex: 1;
    justify-content: center;
    margin-top: 0;
}

.claim-status {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: #8BA3B8;
    margin-bottom: 0.75rem;
}

.claim-status.claimed {
    color: #60A5FA;
    font-weight: 600;
}

.claim-btn {
    width: 100%;
}

.claim-mini-guide {
    margin: 0.35rem 0 0.9rem;
    padding: 0.7rem 0.85rem;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.claim-mini-title {
    margin: 0 0 0.35rem;
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.72);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 600;
}

.claim-mini-steps {
    margin: 0;
    padding-left: 1.1rem;
    color: rgba(255, 255, 255, 0.72);
    font-size: 0.8rem;
    line-height: 1.5;
}

.claim-mini-steps li + li {
    margin-top: 0.18rem;
}

.claim-code-wrap {
    margin-top: 0.85rem;
}

.claim-code {
    margin-bottom: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    background: rgba(59, 130, 246, 0.14);
    border: 1px solid rgba(59, 130, 246, 0.35);
    color: #93C5FD;
    font-family: 'JetBrains Mono', monospace;
    text-align: center;
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.04em;
}

/* ===== Responsive ===== */
@media (max-width: 1200px) {
    .app-grid {
        grid-template-columns: 1fr 1.2fr;
    }
    
    .info-sidebar {
        grid-column: 1 / -1;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: var(--space-lg);
    }
    
    .info-card {
        margin-bottom: 0;
    }
}

@media (max-width: 768px) {
    .nav-links {
        gap: var(--space-md);
    }
    
    .nav-links a:not(.nav-github) {
        display: none;
    }
    
    .app-grid {
        grid-template-columns: 1fr;
    }
    
    .info-sidebar {
        grid-template-columns: 1fr;
    }
    
    .example-buttons {
        flex-wrap: wrap;
    }
    
    .certificate {
        padding: 1.5rem;
    }
    
    .cert-detail-grid {
        grid-template-columns: 1fr;
    }
    
    .share-link-container {
        flex-direction: column;
    }
    
    .copy-link-btn {
        width: 100%;
        justify-content: center;
    }
}


/* ===== Auth Section ===== */
.auth-section {
    margin-bottom: 1rem;
}

.auth-login-prompt {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1.25rem;
    background: rgba(255, 107, 53, 0.05);
    border: 1px solid rgba(255, 107, 53, 0.15);
    border-radius: 12px;
}

.auth-x-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.7rem 1.5rem;
    background: #fff;
    color: #000;
    border: none;
    border-radius: 999px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
}

.auth-x-btn:hover {
    background: #e0e0e0;
    transform: translateY(-1px);
}

.auth-x-btn svg {
    flex-shrink: 0;
}

.auth-hint {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin: 0;
}

.auth-user-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1rem;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 10px;
    flex: 1;
}

.auth-avatar {
    display: flex;
    align-items: center;
    color: var(--text-muted);
}

.auth-username {
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.auth-remaining {
    margin-left: auto;
    font-size: 0.8rem;
    color: var(--accent);
    font-weight: 500;
    white-space: nowrap;
}

.auth-section > :first-child {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.auth-logout-btn {
    padding: 0.5rem 0.9rem;
    background: transparent;
    color: var(--text-muted);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
    white-space: nowrap;
}

.auth-logout-btn:hover {
    color: #ff4444;
    border-color: rgba(255, 68, 68, 0.3);
}