/* ============================================
   GSAP VAULT DESIGN SYSTEM
   ============================================ */

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

:root {
    /* Core colors */
    --black: #0a0a0a;
    --dark: #111111;
    --surface: #1a1a1a;
    --surface-light: #242424;
    --border: #2a2a2a;
    --border-light: #3a3a3a;

    /* Text hierarchy */
    --text: #ffffff;
    --text-secondary: #b0b0b0;
    --text-muted: #999999;

    /* Accent: cyan */
    --cyan: #00e5ff;
    --accent: var(--cyan);

    /* Easing - matches GSAP patterns */
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
    --ease-out-cubic: cubic-bezier(0.33, 1, 0.68, 1);
}

html {
    scroll-behavior: auto;
}

body {
    background: var(--black);
    color: var(--text);
    font-family: 'Space Grotesk', system-ui, sans-serif;
    font-weight: 400;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    line-height: 1.6;
}

::selection {
    background: var(--accent);
    color: var(--black);
}

/* ============================================
   CUSTOM SCROLLBAR
   ============================================ */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--black);
}

::-webkit-scrollbar-thumb {
    background: var(--surface-light);
    border-radius: 5px;
    border: 2px solid var(--black);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-light);
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

/* Syne for display/headlines */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Syne', system-ui, sans-serif;
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.03em;
}

/* JetBrains Mono for code/labels */
code {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85em;
    background: var(--surface);
    padding: 0.15em 0.4em;
    border-radius: 4px;
}

/* ============================================
   LAYOUT
   ============================================ */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 5rem 2rem;
}

/* ============================================
   PAGE HEADER
   ============================================ */
.page-header {
    text-align: center;
    margin-bottom: 6rem;
    padding-top: 2rem;
}

.page-title {
    font-size: clamp(2.5rem, 7vw, 4rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 1rem;
}

.page-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin: 0 auto;
}

/* ============================================
   EXAMPLE SECTIONS
   ============================================ */
.example {
    margin-bottom: 8rem;
    padding-bottom: 4rem;
    border-bottom: 1px solid var(--border);
}

.example:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.example-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.example-number {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent);
    letter-spacing: 0.1em;
}

.example-title {
    font-family: 'Space Grotesk', system-ui, sans-serif;
    font-size: 0.875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
}

.example-content {
    padding-left: 3rem;
}

.example-instruction {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.7;
}

/* ============================================
   EFFECT-SPECIFIC STYLES
   ============================================ */

/* Spacer pushes examples below the fold so the
   scroll trigger is visible in the demo */
.demo-spacer {
    min-height: 45vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.demo-spacer p {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--text-muted);
}

/* Typed headline */
.typewriter-headline {
    font-size: clamp(2rem, 6vw, 3.5rem);
    min-height: 2.2em; /* reserve space, avoid layout shift while typing */
    color: var(--text);
}

/* Looping phrase line */
.typewriter-line {
    font-size: clamp(1.25rem, 3.5vw, 1.75rem);
    font-weight: 500;
    min-height: 1.6em;
}

.typewriter-line [data-typewriter] {
    color: var(--accent);
}

/* Blinking cursor */
.typewriter__cursor {
    display: inline-block;
    width: 0.09em;
    height: 1em;
    margin-left: 0.1em;
    background: var(--accent);
    vertical-align: -0.1em;
    animation: typewriter-blink 1s steps(2, start) infinite;
}

@keyframes typewriter-blink {
    0%, 49% {
        opacity: 1;
    }
    50%, 100% {
        opacity: 0;
    }
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    .container {
        padding: 3rem 1.5rem;
    }

    .page-header {
        margin-bottom: 4rem;
    }

    .example {
        margin-bottom: 5rem;
        padding-bottom: 3rem;
    }

    .example-content {
        padding-left: 0;
    }
}

/* ============================================
   REDUCED MOTION
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .typewriter__cursor {
        display: none;
        animation: none;
    }
}

/* ============================================
   SCREEN READER ONLY (for ARIA live regions)
   ============================================ */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}