/* CSS Variables */
:root {
    /* Brand Colors */
    --color-fresh: #60a5fa;  /* blue-400 */
    --color-context: #9499a1;  /* gray */
    --color-accent: #60a5fa;
    --color-accent-hover: #93c5fd;

    /* Font loading strategy */
    font-display: swap;

    /* Text Colors */
    --color-heading: #c4c8cd;
    --color-body: #9ca3af;
    --color-white: #ffffff;
    --color-black: #000000;

    /* Background Colors */
    --bg-gray-900: #111827;
    --bg-gray-800: #1f2937;
    --bg-gray-700: #374151;
    --bg-code: rgba(17, 24, 39, 0.5);
    --bg-code-inline: rgba(31, 41, 55, 0.5);

    /* Border Colors */
    --border-gray: #4b5563;

    /* Avatar Colors */
    --avatar-user: #a855f7;  /* purple */
    --avatar-bot: #374151;   /* gray */

    /* Spacing */
    --avatar-size: 40px;

    /* Z-index */
    --z-skip-link: 100;
    --z-decoration: 1;
    --z-content: 2;
}

/* Skip link for keyboard navigation */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-accent);
    color: var(--color-black);
    padding: 8px 16px;
    text-decoration: none;
    font-weight: bold;
    z-index: var(--z-skip-link);
}

.skip-link:focus {
    top: 0;
}

/* Screen reader only text */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Avatar styles */
.avatar {
    width: var(--avatar-size);
    height: var(--avatar-size);
    min-width: var(--avatar-size);
    min-height: var(--avatar-size);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 14px;
    flex-shrink: 0;
    font-family: system-ui, -apple-system, sans-serif;
    overflow: hidden;
    color: var(--color-white);
}

/* Markdown code blocks */
.markdown-content pre {
    background: var(--bg-code);
    border: 1px solid var(--bg-gray-700);
    border-radius: 6px;
    padding: 16px;
    overflow-x: auto;
    margin: 16px 0;
}

.markdown-content code {
    background: var(--bg-code-inline);
    color: var(--color-accent);
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 0.9em;
}

.markdown-content pre code {
    background: transparent;
    padding: 0;
    color: #e5e7eb;
}

.markdown-content h1,
.markdown-content h2,
.markdown-content h3 {
    font-weight: bold;
    margin-top: 24px;
    margin-bottom: 12px;
}

.markdown-content h1 { font-size: 1.5em; }
.markdown-content h2 { font-size: 1.3em; }
.markdown-content h3 { font-size: 1.1em; }

.markdown-content p {
    margin-bottom: 16px;
}

.markdown-content p:last-child {
    margin-bottom: 0;
}

.markdown-content ul,
.markdown-content ol {
    margin: 12px 0;
    padding-left: 24px;
}

.markdown-content li {
    margin-bottom: 6px;
}

.markdown-content a {
    color: var(--color-accent);
    text-decoration: underline;
}

.markdown-content blockquote {
    border-left: 4px solid var(--border-gray);
    padding-left: 16px;
    color: var(--color-body);
    font-style: italic;
    margin: 16px 0;
}

/* Streaming wave animation - GrowthBot style */
.streaming-waves {
    width: 100%;
    height: 60px;
    margin-top: 16px;
}

.wave-path {
    stroke: currentColor;
    fill: none;
    stroke-linecap: round;
}

.wave-1 {
    stroke-width: 2;
    opacity: 0.2;
}

.wave-2 {
    stroke-width: 2.5;
    opacity: 0.35;
}

.wave-3 {
    stroke-width: 3;
    opacity: 0.6;
}

.logo {
    color: var(--color-fresh);
    font-weight: inherit;
}

/* Two-tone gradient approach - split after "Fresh" (5 characters) */
.logo[data-name] {
    background: linear-gradient(to right, var(--color-fresh) 3.9ch, var(--color-context) 3.9ch);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Fallback for browsers that don't support background-clip */
@supports not (background-clip: text) {
    .logo[data-name] {
        color: var(--color-fresh);
        background: none;
        -webkit-text-fill-color: unset;
    }
}
.accent-blue { background: linear-gradient(135deg, var(--color-fresh) 0%, #3b82f6 100%); }
.border-accent { border-color: var(--color-accent); }

/* Body text - lighter and more readable */
.text-body { color: var(--color-body); }

/* Softer heading color */
.text-heading { color: var(--color-heading); }

/* Logomark animation */
@keyframes rotate-pulse {
    0%, 100% { transform: rotate(0deg) scale(1); }
    50% { transform: rotate(180deg) scale(1.1); }
}
.logomark {
    animation: rotate-pulse 8s ease-in-out infinite;
}

/* Scroll fade-in animation */
.fade-in-section {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
    /* Prevent layout shift - content will reserve space even when invisible */
    will-change: opacity, transform;
    contain: layout;
}
.fade-in-section.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Subtle scan line effect */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: var(--z-decoration);
    background: repeating-linear-gradient(
        0deg,
        rgba(0, 0, 0, 0.15) 0px,
        transparent 1px,
        transparent 2px,
        rgba(0, 0, 0, 0.15) 3px
    );
}

body > * {
    position: relative;
    z-index: var(--z-content);
}

/* Giant logo decoration */
.logo-decoration {
    position: fixed;
    bottom: -900px;
    right: -900px;
    width: 1800px;
    height: 1800px;
    opacity: 0.04;
    z-index: var(--z-decoration);
    pointer-events: none;
}

.logo-decoration .logo-pulse {
    animation: rotate-pulse 12s linear infinite;
    transform-origin: center;
}

/* Navigation Links */
.nav-link {
    color: var(--color-accent);
    text-decoration: underline;
    text-decoration-thickness: 2px;
    text-underline-offset: 4px;
    transition: text-decoration-thickness 0.2s ease, color 0.2s ease;
}

.nav-link:hover {
    color: var(--color-accent-hover);
    text-decoration-thickness: 3px;
}

/* Progressive Enhancement - hide demo toggle without JS */
#demo-toggle {
    display: none;
}

/* Show demo toggle when JS is enabled */
body.has-js #demo-toggle {
    display: inline-block;
}

/* Without JS, show full demo content */
body:not(.has-js) #demo-content {
    max-height: none !important;
}

body:not(.has-js) #demo-fade {
    display: none;
}