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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    background: #f3f4f6;
    color: #1f2937;
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== Screenshot Section ===== */
.screenshot-section {
    background: #f3f4f6;
    padding: 40px 0 60px;
}

.site-header {
    text-align: center;
    margin-bottom: 30px;
}

.site-logo {
    font-size: 32px;
    font-weight: 800;
    color: #1f2937;
    letter-spacing: -0.5px;
}

.logo-dot {
    color: #2563eb;
}

.site-tagline {
    color: #6b7280;
    font-size: 14px;
    margin-top: 2px;
}

/* Input Area */
.input-area {
    background: #fff;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    margin-bottom: 24px;
}

#text-input {
    width: 100%;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    padding: 14px;
    font-size: 15px;
    font-family: inherit;
    resize: vertical;
    min-height: 120px;
    transition: border-color 0.2s;
    line-height: 1.6;
}

#text-input:focus {
    outline: none;
    border-color: #2563eb;
}

/* Collapsible input */
.input-area.collapsed {
    max-height: 0;
    overflow: hidden;
    padding: 0 20px;
    margin-bottom: 0;
    opacity: 0;
    transition: max-height 0.4s ease, opacity 0.3s ease, padding 0.4s ease, margin 0.4s ease;
}

.input-area:not(.collapsed) {
    max-height: 500px;
    opacity: 1;
    transition: max-height 0.4s ease, opacity 0.3s ease;
}

.expand-btn {
    display: block;
    margin: 0 auto 16px;
    background: none;
    border: 1px solid #d1d5db;
    padding: 6px 18px;
    border-radius: 6px;
    font-size: 13px;
    color: #6b7280;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
}

.expand-btn:hover {
    background: #f3f4f6;
    color: #1f2937;
}

.expand-btn.hidden {
    display: none;
}

.input-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 12px;
}

#char-count-input {
    color: #9ca3af;
    font-size: 13px;
}

#analyze-btn {
    background: #1e3a5f;
    color: #fff;
    border: none;
    padding: 12px 28px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
}

#analyze-btn:hover {
    background: #15294a;
    transform: translateY(-1px);
}

#analyze-btn:active {
    transform: translateY(0);
}

#analyze-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

#analyze-btn.loading {
    background: #374151;
}

/* Results Panel */
.results-panel {
    background: #fff;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: opacity 0.4s, transform 0.4s;
}

.results-panel.hidden {
    display: none;
}

.results-panel.revealing {
    opacity: 0.7;
}

.results-panel.revealed {
    opacity: 1;
}

.results-header {
    text-align: center;
    margin-bottom: 8px;
}

.results-header h2 {
    font-size: 20px;
    font-weight: 700;
    color: #1f2937;
}

/* Gauge */
.gauge-container {
    display: flex;
    justify-content: center;
    margin: 0 auto 16px;
    max-width: 260px;
}

.gauge-svg {
    width: 100%;
    height: auto;
}

/* Model Prediction */
.model-prediction {
    text-align: center;
    margin-bottom: 20px;
    padding: 10px 16px;
    background: #f9fafb;
    border-radius: 8px;
    font-size: 14px;
}

.prediction-label {
    color: #6b7280;
}

.prediction-value {
    font-weight: 700;
    color: #dc2626;
    margin: 0 6px;
}

.prediction-confidence {
    color: #6b7280;
    font-size: 13px;
    display: block;
    margin-top: 2px;
}

/* Highlighted Text */
.highlighted-text {
    padding: 16px;
    background: #fefefe;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    font-size: 15px;
    line-height: 2;
    margin-bottom: 16px;
    max-height: 400px;
    overflow-y: auto;
}

.highlight {
    padding: 2px 0;
    border-radius: 2px;
    position: relative;
    cursor: default;
}

.highlight-red {
    background: rgba(239, 68, 68, 0.18);
    border-bottom: 2px solid rgba(239, 68, 68, 0.5);
}

.highlight-orange {
    background: rgba(234, 179, 8, 0.18);
    border-bottom: 2px solid rgba(234, 179, 8, 0.5);
}

.highlight-purple {
    background: rgba(168, 85, 247, 0.18);
    border-bottom: 2px solid rgba(168, 85, 247, 0.5);
}

.highlight-blue {
    background: rgba(59, 130, 246, 0.18);
    border-bottom: 2px solid rgba(59, 130, 246, 0.5);
}

.highlight-yellow {
    background: rgba(250, 204, 21, 0.18);
    border-bottom: 2px solid rgba(250, 204, 21, 0.5);
}

.highlight-pink {
    background: rgba(236, 72, 153, 0.18);
    border-bottom: 2px solid rgba(236, 72, 153, 0.5);
}

.highlight:hover::after {
    content: attr(data-label);
    position: absolute;
    bottom: calc(100% + 4px);
    left: 50%;
    transform: translateX(-50%);
    background: #1f2937;
    color: #fff;
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 500;
    white-space: nowrap;
    z-index: 10;
    pointer-events: none;
}

/* Legend */
.legend {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 18px;
    margin-bottom: 16px;
    padding: 10px 0;
    font-size: 12px;
    color: #6b7280;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 5px;
}

.legend-color {
    display: inline-block;
    width: 14px;
    height: 14px;
    border-radius: 3px;
    flex-shrink: 0;
}

/* Results Footer */
.results-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 12px;
    border-top: 1px solid #e5e7eb;
}

.stats {
    font-size: 13px;
    color: #6b7280;
}

.stats-sep {
    margin: 0 8px;
    color: #d1d5db;
}

.watermark {
    font-size: 14px;
    font-weight: 700;
    color: #6b7280;
    letter-spacing: 0.3px;
}

/* ===== Explanation Section ===== */
.explanation-section {
    background: #fff;
    padding: 60px 0 40px;
    border-top: 4px solid #2563eb;
}

.parody-notice {
    margin-bottom: 40px;
}

.parody-notice h2 {
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 16px;
    color: #1f2937;
}

.parody-notice p {
    font-size: 16px;
    color: #4b5563;
    margin-bottom: 12px;
    max-width: 680px;
}

.real-detection {
    margin-bottom: 40px;
}

.real-detection h2 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 12px;
    color: #1f2937;
}

.real-detection > p {
    font-size: 16px;
    color: #4b5563;
    margin-bottom: 24px;
    max-width: 680px;
}

/* Pangram Card */
.pangram-card {
    background: #f0f4ff;
    border: 1px solid #c7d2fe;
    border-radius: 12px;
    padding: 28px;
}

.pangram-card h3 {
    font-size: 22px;
    font-weight: 700;
    color: #1e3a5f;
    margin-bottom: 4px;
}

.pangram-subtitle {
    color: #6b7280;
    font-size: 14px;
    margin-bottom: 20px;
}

.evidence-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 20px;
}

.evidence-item {
    background: #fff;
    border-radius: 8px;
    padding: 16px;
    border: 1px solid #e0e7ff;
}

.evidence-stat {
    font-size: 24px;
    font-weight: 800;
    color: #2563eb;
    margin-bottom: 6px;
}

.evidence-desc {
    font-size: 13px;
    color: #4b5563;
    line-height: 1.5;
    margin-bottom: 8px;
}

.evidence-source {
    font-size: 12px;
}

.evidence-source a {
    color: #2563eb;
    text-decoration: none;
}

.evidence-source a:hover {
    text-decoration: underline;
}

.pangram-cta {
    display: inline-block;
    background: #2563eb;
    color: #fff;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 15px;
    transition: background 0.2s;
}

.pangram-cta:hover {
    background: #1d4ed8;
}

.pangram-disclaimer {
    margin-top: 16px;
    font-size: 12px;
    color: #9ca3af;
    line-height: 1.5;
    font-style: italic;
}

/* Footer */
.site-footer {
    text-align: center;
    padding: 24px 0;
    color: #9ca3af;
    font-size: 13px;
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
    .screenshot-section {
        padding: 24px 0 40px;
    }

    .site-logo {
        font-size: 26px;
    }

    .results-panel {
        padding: 20px 16px;
    }

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

    .input-footer {
        flex-direction: column;
        gap: 10px;
        align-items: stretch;
    }

    #analyze-btn {
        text-align: center;
    }

    .legend {
        gap: 6px 12px;
    }

    .results-footer {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }
}