/* =========================================================
   Design tokens — single source of truth for the site.
   Extends the existing wave palette upward into "sky" and
   downward into "abyss". Every other stylesheet references
   these variables.
   ========================================================= */

@font-face {
    font-family: 'RobotoMono';
    src: url('../fonts/RobotoMono-Regular.ttf') format('truetype');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'RobotoMono';
    src: url('../fonts/RobotoMono-Medium.ttf') format('truetype');
    font-weight: 500;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'RobotoMono';
    src: url('../fonts/RobotoMono-Bold.ttf') format('truetype');
    font-weight: 700;
    font-style: normal;
    font-display: swap;
}

:root {
    /* ---- Sea palette (surface -> seabed) ------------------ */
    --sky:            #f7fbff;
    --foam:           #e6f2ff;
    --wave:           #0099ff;
    --wave-darker:    #0066cc;
    --wave-darkest:   #003366;
    --abyss:          #011a33;

    /* ---- Ink, accents, medals ----------------------------- */
    --ink:            #0a1929;
    --ink-muted:      #4a5a6e;
    --on-dark:        #eaf3ff;
    --on-dark-muted:  #9ab4cc;
    --border-soft:    rgba(10, 25, 41, 0.08);
    --border-on-dark: rgba(234, 243, 255, 0.14);

    --accent:         #7fd3ff;   /* bioluminescent cyan */
    --accent-strong:  #00c2ff;

    --gold:           #d4a84b;
    --silver:         #c0c7cf;
    --bronze:         #b87333;

    /* ---- Typography --------------------------------------- */
    --font-mono:      'RobotoMono', ui-monospace, SFMono-Regular, Menlo, monospace;
    --font-sans:      'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;

    --fs-hero:        clamp(2.5rem, 7vw, 5rem);
    --fs-h2:          clamp(1.75rem, 3.2vw, 2.5rem);
    --fs-h3:          1.25rem;
    --fs-body:        1.0625rem;
    --fs-small:       0.9rem;
    --fs-mono:        0.85rem;

    /* ---- Layout ------------------------------------------- */
    --content-max:    1100px;
    --gutter:         clamp(1.25rem, 4vw, 3rem);
    --section-pad-y:  clamp(4rem, 9vw, 7rem);
    --radius-sm:      6px;
    --radius-md:      12px;
    --radius-lg:      20px;

    /* ---- Motion ------------------------------------------- */
    --ease:           cubic-bezier(0.22, 1, 0.36, 1);
    --dur:            240ms;

    /* ---- Elevation ---------------------------------------- */
    --shadow-sm:      0 2px 6px rgba(0, 30, 60, 0.08);
    --shadow-md:      0 10px 30px rgba(0, 30, 60, 0.12);
    --shadow-on-dark: 0 20px 45px rgba(0, 0, 0, 0.35);
}

/* =========================================================
   Base reset + global defaults
   ========================================================= */

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

html,
body {
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-sans);
    font-size: var(--fs-body);
    line-height: 1.6;
    color: var(--ink);
    background: var(--sky);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

img,
svg {
    display: block;
    max-width: 100%;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--dur) var(--ease);
}

:focus-visible {
    outline: 2px solid var(--accent-strong);
    outline-offset: 3px;
    border-radius: 3px;
}

/* Users with reduced motion preference get a calmer experience. */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    *,
    *::before,
    *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
    }
}

/* =========================================================
   Generic layout utilities used across sections
   ========================================================= */

.container {
    width: 100%;
    max-width: var(--content-max);
    margin-inline: auto;
    padding-inline: var(--gutter);
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    font-family: var(--font-mono);
    font-size: var(--fs-mono);
    font-weight: 500;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--accent);
    margin: 0 0 1rem;
}

.eyebrow .eyebrow-num {
    color: currentColor;
    opacity: 0.7;
}

.section {
    position: relative;
    padding-block: var(--section-pad-y);
}

.section-heading {
    font-family: var(--font-sans);
    font-size: var(--fs-h2);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.01em;
    margin: 0 0 2.5rem;
    color: inherit;
}

.section-lead {
    font-size: 1.15rem;
    line-height: 1.6;
    max-width: 60ch;
    margin: 0 0 2.5rem;
    color: inherit;
    opacity: 0.85;
}

/* Surfaces for layering in the depth metaphor */
.surface-sky    { background: var(--sky);         color: var(--ink); }
.surface-foam   { background: var(--foam);        color: var(--ink); }
.surface-wave   { background: var(--wave);        color: var(--on-dark); }
.surface-darker { background: var(--wave-darker); color: var(--on-dark); }
.surface-deep   { background: var(--wave-darkest);color: var(--on-dark); }
.surface-abyss  { background: var(--abyss);       color: var(--on-dark); }

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

/* Skip-to-content link reveals itself on keyboard focus. */
.visually-hidden:focus,
.visually-hidden:focus-visible {
    position: fixed;
    top: 0.75rem;
    left: 0.75rem;
    width: auto;
    height: auto;
    padding: 0.6rem 1rem;
    margin: 0;
    overflow: visible;
    clip: auto;
    white-space: normal;
    background: var(--ink);
    color: var(--sky);
    border-radius: var(--radius-sm);
    z-index: 2000;
    font-family: var(--font-mono);
    font-size: 0.85rem;
}