@import url('https://fonts.googleapis.com/css2?family=Lexend:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* ============================================================================
   CSS VARIABLES - Brand Colors & Design Tokens
   See BRAND_COLORS.md for full documentation and contrast ratios
   ============================================================================ */

:root {
    /* ----------------------------------------
       FONTS
       ---------------------------------------- */
    --font-sans: "Lexend", "Atkinson Hyperlegible", "Open Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    --font-mono: "JetBrains Mono", "Fira Code", "Cascadia Code", "Source Code Pro", Consolas, monospace;

    /* ----------------------------------------
       BRAND COLORS
       ---------------------------------------- */
    /* Primary */
    --primary: #5984FF;
    --accent-yellow: #FFA700;

    /* Secondary */
    --accent-magenta: #D72274;
    --accent-orange: #FE5600;
    --accent-purple: #6D53EE;

    /* ----------------------------------------
       HOVER VARIANTS (contrast-safe)
       Use with white text for WCAG compliance
       ---------------------------------------- */
    --primary-hover: #4a73e8;
    --orange-hover: #e04d00;

    /* ----------------------------------------
       SURFACES
       ---------------------------------------- */
    --bg: #FFFFFF;
    --surface: #F9FAFC;
    --surface-alt: #F1F2F6;

    /* ----------------------------------------
       TEXT COLORS
       ---------------------------------------- */
    --ink: #050810;
    --muted: #5F6F9B;

    /* ----------------------------------------
       LINKS
       ---------------------------------------- */
    --link: #5984FF;
    --link-visited: #6D53EE;

    /* ----------------------------------------
       PASTELS (derived from primaries)
       ---------------------------------------- */
    --pastel-blue: #D5E0FF;
    --pastel-peach: #FFE9BF;
    --pastel-lavender: #E0DBFD;
    --pastel-pink: #F5D6E8;

    /* ----------------------------------------
       DARK ACCENTS
       ---------------------------------------- */
    --accent-navy: #0F182D;

    /* ----------------------------------------
       EFFECTS
       ---------------------------------------- */
    --shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

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

body {
    font-family: var(--font-sans);
    font-weight: 400;
    background: var(--surface);
    min-height: 100vh;
    padding: 20px;
    padding-bottom: 50vh;
    color: var(--ink);
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: var(--bg);
    border-radius: 10px;
    box-shadow: var(--shadow);
    padding: 40px;
    border: 1px solid var(--surface);
}

.section-default {
    background: var(--bg);
    color: var(--ink);
}

.section-soft {
    background: var(--surface);
    color: var(--ink);
}

.section-spotlight {
    background: var(--accent-purple);
    color: #ffffff;
}

.section-spotlight.navy {
    background: var(--accent-navy);
}

.section-hero {
    background: var(--bg);
    color: var(--ink);
}

.brand-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-bottom: 28px;
    flex-wrap: wrap;
}

.brand-logo-wrap {
    background: var(--muted);             /* 4.96:1 contrast with white - PASS AA */
    padding: 10px 16px;
    border-radius: 8px;
}

.brand-logo {
    max-height: 54px;
    width: auto;
    display: block;
}

.brand-copy {
    max-width: 420px;
}

.brand-copy h1,
.brand-copy .subtitle {
    text-align: left;
}

h1 {
    color: var(--ink);
    text-align: center;
    margin-bottom: 8px;
    font-size: 1.875em;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.subtitle {
    text-align: center;
    color: var(--muted);
    margin-bottom: 32px;
    font-size: 1em;
    font-weight: 400;
}

a {
    color: var(--link);
    text-decoration: none;
    font-weight: 500;
}

a:hover,
a:focus {
    color: var(--accent-purple);
    text-decoration: underline;
}

a:visited {
    color: var(--link-visited);
}

.footer-note {
    text-align: center;
    margin-top: 18px;
    color: var(--muted);
    font-size: 0.85em;
    letter-spacing: 0.03em;
    opacity: 0.8;
}

.controls {
    background: var(--surface-alt);
    padding: 24px;
    border-radius: 6px;
    margin-bottom: 24px;
    border: 1px solid var(--surface-alt);
}

.input-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 700;
    color: var(--ink);
    font-size: 0.875em;
}

textarea {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--muted);
    border-radius: 4px;
    font-size: 15px;
    font-family: inherit;
    resize: vertical;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
    background: var(--bg);
}

textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(89, 131, 255, 0.15);
}

.button-group {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

/* ============================================================================
   BUTTONS
   Contrast ratios documented in BRAND_COLORS.md
   - Primary/Secondary: dark text (--ink) on brand color = PASS AA
   - Hover states: white text on darker variant = PASS Large
   - Danger: white on magenta/purple = PASS AA
   ============================================================================ */

.btn {
    padding: 10px 20px;
    border: 1px solid transparent;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s ease;
    flex: 1;
    min-width: 140px;
}

.btn-primary {
    background: var(--primary-hover);
    color: white;                         /* 4.28:1 contrast - PASS Large */
    border-color: var(--primary-hover);
}

.btn-primary:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--ink);                    /* 5.88:1 contrast - PASS AA */
}

.btn-secondary {
    background: var(--orange-hover);
    color: white;                         /* 4.01:1 contrast - PASS Large */
    border-color: var(--orange-hover);
}

.btn-secondary:hover {
    background: var(--accent-orange);
    color: var(--ink);                    /* 6.24:1 contrast - PASS AA */
    border-color: var(--accent-orange);
}

.btn-danger {
    background: var(--accent-magenta);
    color: white;                         /* 4.81:1 contrast - PASS AA */
    border-color: var(--accent-magenta);
}

.btn-danger:hover {
    background: var(--accent-magenta);
    color: white;
    opacity: 0.85;                        /* Subtle hover without jarring color shift */
    border-color: var(--accent-magenta);
}

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

.btn:focus-visible {
    outline: 3px solid rgba(89, 131, 255, 0.35);
    outline-offset: 2px;
}

.model-indicator {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--pastel-blue);
}

.model-label {
    font-weight: 700;
    color: var(--ink);
    font-size: 0.875em;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.model-select {
    background: var(--primary-hover);
    color: white;                         /* 4.28:1 contrast - PASS Large */
    padding: 6px 12px;
    border-radius: 4px;
    font-size: 0.85em;
    font-family: var(--font-mono);
    border: none;
    cursor: pointer;
    outline: none;
}

.model-select:hover {
    background: var(--primary);
    color: var(--ink);                    /* 5.88:1 contrast - PASS AA */
}

.model-select option {
    background: var(--bg);
    color: var(--ink);
}

.output {
    background: var(--bg);
    border: 1px solid var(--pastel-blue);
    border-radius: 6px;
    padding: 24px;
    min-height: 200px;
    line-height: 2;
    font-size: 16px;
}

/* Ensure multiple <br> tags create visible line breaks */
.output br {
    display: block;
    content: "";
    margin-top: 0.5em;  /* Each <br> creates about half a line of space */
}

.empty-state {
    text-align: center;
    color: var(--muted);
    padding: 40px;
}

.empty-state p:first-child {
    font-size: 1.1em;
    margin-bottom: 8px;
}

.error-state {
    color: var(--accent-magenta);
    background: var(--pastel-pink);
    border-radius: 6px;
}

.hint-text {
    color: var(--muted);
    font-size: 0.875em;
    margin-top: 10px;
}

.token {
    display: inline-block;
    padding: 3px 6px;
    margin: 2px;
    border-radius: 3px;
    cursor: pointer;
    position: relative;
    border: 1px solid transparent;
    color: var(--ink);
    font-family: var(--font-mono);
    font-size: 0.9em;
}

.token:hover {
    border-color: var(--primary);
}

.token.selected {
    border: 1px solid var(--primary);
    box-shadow: 0 0 0 2px rgba(89, 131, 255, 0.2);
}

.token.newline-token {
    background: var(--surface-alt);
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.8em;
    padding: 2px 5px;
    border: 1px dashed var(--muted);
}

.token.special-token {
    background: var(--pastel-lavender);
    color: var(--accent-purple);
    font-family: var(--font-mono);
    font-size: 0.75em;
    padding: 2px 6px;
    border: 1px solid var(--accent-purple);
    border-radius: 4px;
    font-weight: 600;
}

.loading {
    text-align: center;
    padding: 30px;
}

.spinner {
    border: 3px solid var(--surface);
    border-top: 3px solid var(--primary);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto 15px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.tooltip {
    position: fixed;
    background: var(--bg);
    border: 1px solid var(--primary);
    border-radius: 6px;
    padding: 14px;
    box-shadow: var(--shadow);
    z-index: 1000;
    max-width: 280px;
    pointer-events: none;
}

.tooltip-header {
    font-weight: 700;
    color: var(--ink);
    margin-bottom: 10px;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.alternative {
    padding: 8px 10px;
    margin: 4px 0;
    background: var(--surface);
    border-radius: 4px;
    cursor: pointer;
    pointer-events: all;
    transition: all 0.15s ease;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid var(--pastel-blue);
}

.alternative:hover {
    background: var(--pastel-blue);
    border-color: var(--primary);
}

.alternative-selected {
    background: var(--pastel-blue);
    border-color: var(--primary);
    box-shadow: inset 3px 0 0 var(--primary);
}

.alternative-selected .alternative-token {
    color: var(--primary);
}

/* Replacement character tokens */
.replacement-char-token {
    font-family: var(--font-mono);
    font-size: 0.85em;
    opacity: 0.8;
}

.replacement-preview {
    font-family: 'Segoe UI Emoji', 'Apple Color Emoji', 'Noto Color Emoji', sans-serif;
    font-size: 1.1em;
    margin-left: 6px;
    opacity: 0.9;
}

.alternative-token {
    font-family: var(--font-mono);
    font-weight: 500;
}

.alternative-prob {
    color: var(--muted);
    font-size: 0.85em;
}

/* Probability-based coloring - green/yellow/red */
.prob-high {
    background: #d4edda;
    color: var(--ink);
}

.prob-medium {
    background: #fff3cd;
    color: var(--ink);
}

.prob-low {
    background: #f8d7da;
    color: var(--ink);
}

/* Markdown formatting */
.token.md-bold {
    font-weight: 700;
}

.token.md-italic {
    font-style: italic;
}

.token.md-delimiter {
    color: var(--muted);
    opacity: 0.7;
}

@media (max-width: 768px) {
    .container {
        padding: 20px;
    }
    
    h1 {
        font-size: 1.5em;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .legend-items {
        flex-direction: column;
        gap: 15px;
    }
}

/* ============================================================================
   COST DISPLAY
   ============================================================================ */

.cost-display {
    font-family: var(--font-mono);
    font-size: 0.85em;
    color: var(--muted);
    text-align: right;
    padding: 8px 0;
    margin-bottom: 8px;
}