@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ============================
   DESIGN TOKENS
   ============================ */
:root {
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Colors */
    --bg: #0a0a0f;
    --bg-elevated: #12121a;
    --bg-card: rgba(18, 18, 26, 0.85);
    --bg-card-hover: rgba(24, 24, 36, 0.95);
    --bg-input: rgba(255, 255, 255, 0.06);

    --text: #e4e4e7;
    --text-muted: #71717a;
    --text-dim: #52525b;

    --border: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.15);

    --accent: #818cf8;
    --accent-glow: rgba(129, 140, 248, 0.15);
    --accent-strong: #6366f1;

    --positive: #10b981;
    --positive-bg: rgba(16, 185, 129, 0.12);
    --negative: #ef4444;
    --negative-bg: rgba(239, 68, 68, 0.12);
    --neutral: #64748b;
    --neutral-bg: rgba(100, 116, 139, 0.12);

    --radius: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 999px;

    --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.6);
}


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

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: #a5b4fc; }

.container { max-width: 1100px; margin: 0 auto; padding: 0 1.5rem; }


/* ============================
   LANDING PAGE
   ============================ */
.landing {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.landing-glow {
    position: absolute;
    top: -200px;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.12) 0%, transparent 65%);
    pointer-events: none;
}

.landing-container { text-align: center; width: 100%; }

.hero { margin-bottom: 3rem; }

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    border-radius: var(--radius-full);
    background: var(--accent-glow);
    color: var(--accent);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(129, 140, 248, 0.2);
}

.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    color: #fff;
    letter-spacing: -1.5px;
    line-height: 1.1;
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-muted);
    max-width: 520px;
    margin: 0 auto;
    line-height: 1.7;
}


/* ============================
   SCAN FORM (Landing)
   ============================ */
.scan-form { max-width: 600px; margin: 0 auto 3rem; }

.input-group {
    display: flex;
    gap: 0;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 6px;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.input-group:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.input-group input {
    flex: 1;
    background: transparent;
    border: none;
    padding: 14px 20px;
    color: var(--text);
    font-size: 1rem;
    font-family: var(--font);
    outline: none;
}

.input-group input::placeholder { color: var(--text-dim); }

.input-hint {
    margin-top: 0.75rem;
    font-size: 0.8rem;
    color: var(--text-dim);
}


/* ============================
   BUTTONS
   ============================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-full);
    font-family: var(--font);
    font-size: 0.9rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all 0.25s ease;
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--accent-strong);
    color: #fff;
}
.btn-primary:hover {
    background: #4f46e5;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
    color: #fff;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text);
    border: 1px solid var(--border);
}
.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: var(--border-hover);
    color: #fff;
}

.btn-sm { padding: 8px 16px; font-size: 0.8rem; }

.btn-brief {
    width: 100%;
    background: rgba(129, 140, 248, 0.1);
    color: var(--accent);
    border: 1px solid rgba(129, 140, 248, 0.2);
    padding: 10px 20px;
    font-family: var(--font);
    border-radius: var(--radius);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s ease;
}
.btn-brief:hover {
    background: rgba(129, 140, 248, 0.2);
    border-color: rgba(129, 140, 248, 0.4);
    box-shadow: 0 4px 16px rgba(129, 140, 248, 0.15);
}

.btn-loader {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.btn-loader svg {
    animation: spin 1.2s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }


/* ============================
   HOW IT WORKS
   ============================ */
.how-it-works {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    margin-top: 1rem;
}

.step {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
}

.step-number {
    width: 36px; height: 36px;
    border-radius: 50%;
    background: var(--accent-glow);
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
    flex-shrink: 0;
    border: 1px solid rgba(129, 140, 248, 0.2);
}

.step-content h3 {
    font-size: 0.9rem;
    font-weight: 700;
    color: #fff;
    text-align: left;
}

.step-content p {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: left;
    max-width: 180px;
}

.step-connector {
    width: 40px;
    height: 1px;
    background: var(--border);
}

@media (max-width: 768px) {
    .how-it-works { flex-direction: column; gap: 0.5rem; }
    .step-connector { width: 1px; height: 24px; }
}


/* ============================
   RESULTS PAGE
   ============================ */
.results-container { padding-top: 2rem; padding-bottom: 4rem; }

.results-header {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
}

.results-header h1 {
    font-size: 1.6rem;
    font-weight: 700;
    color: #fff;
    margin: 0.5rem 0;
}

.topic-highlight { color: var(--accent); }

.back-link {
    font-size: 0.85rem;
    color: var(--text-muted);
    transition: color 0.2s;
}
.back-link:hover { color: var(--accent); }

.meta { color: var(--text-muted); font-size: 0.85rem; }

.actions { margin-top: 1rem; display: flex; gap: 0.5rem; flex-wrap: wrap; }


/* ============================
   SUMMARY BAR
   ============================ */
.summary-bar {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
}

.summary-stat {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    text-align: center;
    backdrop-filter: blur(12px);
}

.summary-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 4px;
}

.summary-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.sentiment-color-positive { color: var(--positive) !important; font-size: 1rem !important; }
.sentiment-color-negative { color: var(--negative) !important; font-size: 1rem !important; }
.sentiment-color-neutral { color: var(--neutral) !important; font-size: 1rem !important; }

@media (max-width: 768px) {
    .summary-bar { grid-template-columns: repeat(2, 1fr); }
}


/* ============================
   RESULTS GRID
   ============================ */
.results-grid {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 2rem;
    align-items: start;
}

@media (max-width: 900px) {
    .results-grid { grid-template-columns: 1fr; }
}

.section-title {
    font-size: 1rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}


/* ============================
   GAP CARDS
   ============================ */
.gap-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    margin-bottom: 1rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(12px);
}

.gap-card:hover {
    border-color: var(--border-hover);
    background: var(--bg-card-hover);
    box-shadow: var(--shadow);
}

.gap-card-header {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1rem;
}

.gap-rank {
    width: 32px; height: 32px;
    border-radius: 8px;
    background: var(--accent-glow);
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.8rem;
    flex-shrink: 0;
}

.gap-info { flex: 1; }

.gap-title {
    font-size: 1.05rem;
    font-weight: 600;
    color: #fff;
    margin-bottom: 4px;
    text-transform: capitalize;
}

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

.gap-score-badge {
    text-align: center;
    padding: 8px 14px;
    background: var(--accent-glow);
    border-radius: var(--radius);
    border: 1px solid rgba(129, 140, 248, 0.15);
    flex-shrink: 0;
}

.score-value {
    display: block;
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--accent);
    line-height: 1;
}

.score-label {
    font-size: 0.6rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}


/* ============================
   GAP SIGNALS
   ============================ */
.gap-card-body { margin-top: 0.75rem; }

.gap-signals {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1rem;
}

.signal {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 8px;
}

.signal-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.3px;
    min-width: 70px;
}

.signal-bar {
    flex: 1;
    height: 4px;
    background: rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.signal-fill {
    height: 100%;
    border-radius: var(--radius-full);
    transition: width 0.8s ease;
}

.so-fill { background: linear-gradient(90deg, var(--accent), #a78bfa); }

.signal-value {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text);
    min-width: 36px;
    text-align: right;
}


/* ============================
   DIFFICULTY DOTS
   ============================ */
.difficulty-dots {
    display: flex;
    gap: 4px;
    flex: 1;
    justify-content: center;
}

.dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.08);
    transition: background 0.3s;
}

.dot.active { background: #fbbf24; box-shadow: 0 0 6px rgba(251, 191, 36, 0.4); }


/* ============================
   SENTIMENT BADGES (inline)
   ============================ */
.sentiment-positive { color: var(--positive); font-weight: 600; }
.sentiment-negative { color: var(--negative); font-weight: 600; }
.sentiment-neutral { color: var(--neutral); font-weight: 600; }


/* ============================
   SIDEBAR CARDS
   ============================ */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    backdrop-filter: blur(12px);
}

.sidebar-card {
    margin-bottom: 1rem;
}

.sidebar-card h3 {
    font-size: 0.85rem;
    font-weight: 700;
    color: #fff;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 1rem;
}

.chart-container {
    position: relative;
    height: 180px;
    width: 100%;
    margin-bottom: 1rem;
}

.sentiment-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.legend-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
}
.legend-dot.positive { background: var(--positive); }
.legend-dot.negative { background: var(--negative); }
.legend-dot.neutral { background: var(--neutral); }


/* ============================
   SO QUESTIONS LIST
   ============================ */
.so-questions-list {
    list-style: none;
}

.so-question {
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
}
.so-question:last-child { border-bottom: none; }

.so-q-title {
    font-size: 0.85rem;
    color: var(--text);
    display: block;
    margin-bottom: 4px;
    line-height: 1.4;
}
.so-q-title:hover { color: var(--accent); }

.so-q-stats {
    display: flex;
    gap: 10px;
    font-size: 0.7rem;
    color: var(--text-dim);
}

.opp-score {
    color: var(--accent);
    font-weight: 600;
}


/* ============================
   BRIEF MODAL
   ============================ */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    padding: 2rem;
}

.modal-overlay.visible {
    opacity: 1;
    pointer-events: all;
}

.modal {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    max-width: 640px;
    width: 100%;
    max-height: 85vh;
    overflow-y: auto;
    padding: 2rem;
    position: relative;
    box-shadow: var(--shadow-lg);
    animation: modalIn 0.3s ease;
}

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

.modal-close {
    position: absolute;
    top: 16px; right: 16px;
    width: 32px; height: 32px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}
.modal-close:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
}


/* ============================
   BRIEF CONTENT
   ============================ */
.brief-loading {
    text-align: center;
    padding: 3rem 1rem;
}

.brief-loading p {
    margin-top: 1rem;
    color: var(--text-muted);
}

.spinner {
    width: 40px; height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto;
}

.brief-error {
    text-align: center;
    padding: 2rem 1rem;
}
.brief-error h3 { color: var(--negative); margin-bottom: 0.5rem; }
.brief-error p { color: var(--text-muted); margin-bottom: 1rem; }

.brief-header {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}

.brief-diff {
    font-size: 0.8rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.brief-diff-label {
    font-weight: 400;
    color: var(--text-muted);
    margin-left: 8px;
}

.brief-title {
    font-size: 1.35rem;
    font-weight: 700;
    color: #fff;
    line-height: 1.3;
}

.brief-section {
    margin-bottom: 1.5rem;
}

.brief-section h4 {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.5rem;
}

.brief-section p {
    font-size: 0.95rem;
    color: var(--text);
    line-height: 1.6;
}

.brief-points, .brief-questions {
    list-style: none;
}

.brief-points li {
    padding: 6px 0 6px 20px;
    position: relative;
    font-size: 0.9rem;
    color: var(--text);
}

.brief-points li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 14px;
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--accent);
}

.brief-question {
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
}
.brief-question:last-child { border-bottom: none; }

.brief-question a {
    font-size: 0.9rem;
    color: var(--text);
    display: block;
    margin-bottom: 4px;
}
.brief-question a:hover { color: var(--accent); }

.brief-q-stats {
    font-size: 0.7rem;
    color: var(--text-dim);
}

.brief-actions {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
    display: flex;
    gap: 0.5rem;
}


/* ============================
   UTILITY
   ============================ */
.text-muted { color: var(--text-muted); font-size: 0.85rem; }

.error-card {
    background: var(--negative-bg);
    color: var(--negative);
    padding: 1.25rem;
    border-radius: var(--radius);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-muted);
}


/* ============================
   SCROLLBAR
   ============================ */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover { background: rgba(255, 255, 255, 0.2); }


/* ============================
   v1 BACKWARD COMPAT STYLES
   ============================ */
.landing-container.legacy { text-align: center; }

.scan-form.legacy { max-width: 500px; }
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; margin-bottom: 0.5rem; font-weight: 500; color: var(--text); }
.form-group input {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-input);
    color: var(--text);
    font-family: var(--font);
    outline: none;
    box-sizing: border-box;
}
.form-group input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.data-table { width: 100%; border-collapse: collapse; }
.data-table th, .data-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}
.data-table th {
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.85rem;
    text-transform: uppercase;
}

.badge {
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}
.sentiment-positive-bg { background: var(--positive-bg); color: var(--positive); }
.sentiment-negative-bg { background: var(--negative-bg); color: var(--negative); }
.sentiment-neutral-bg { background: var(--neutral-bg); color: var(--neutral); }
.score-badge { background: var(--accent-glow); color: var(--accent); }

.grid { display: grid; gap: 1.5rem; }
.col-2 { grid-template-columns: 1fr 1fr; }
@media (max-width: 768px) { .col-2 { grid-template-columns: 1fr; } }

.platform-cards { display: flex; gap: 2rem; justify-content: center; }
.platform-cards .card {
    width: 300px;
    text-align: left;
    transition: transform 0.2s, box-shadow 0.2s;
}
.platform-cards .card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}
.llm-summary { color: var(--text); line-height: 1.6; }