/* ─────────────────────────────────────────────
   TOKENS
───────────────────────────────────────────── */
:root {
    --bg: #f5f7f5;
    --surface: #ffffff;
    --text: #1c271e;
    --muted: #6a7a6b;
    --accent: #306e41;
    --border: #dde5dd;
    --serif: "Instrument Serif", Georgia, serif;
    --sans: "DM Sans", "Helvetica Neue", sans-serif;
    --mono: "DM Mono", "SF Mono", monospace;
    --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ─────────────────────────────────────────────
   RESET
───────────────────────────────────────────── */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
html {
    scroll-behavior: smooth;
}
body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--sans);
    font-weight: 300;
    line-height: 1.6;
    overflow-x: hidden;
}
img {
    display: block;
    max-width: 100%;
}
a {
    color: inherit;
}

/* ─────────────────────────────────────────────
   KEYFRAMES
───────────────────────────────────────────── */
@keyframes pageIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}
@keyframes driftA {
    to {
        transform: translate(4%, 9%);
    }
}
@keyframes driftB {
    to {
        transform: translate(-5%, -6%);
    }
}
@keyframes trackDrop {
    0% {
        top: -50%;
    }
    100% {
        top: 110%;
    }
}

/* ─────────────────────────────────────────────
   SCROLL PROGRESS
───────────────────────────────────────────── */
#progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: var(--accent);
    transform: scaleX(0);
    transform-origin: left;
    z-index: 200;
    transition: transform 80ms linear;
}

/* ─────────────────────────────────────────────
   AMBIENT BACKGROUND
───────────────────────────────────────────── */
.ambient {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
}
.ambient::before {
    content: "";
    position: absolute;
    top: -15%;
    left: -5%;
    width: 55%;
    height: 55%;
    border-radius: 50%;
    background: radial-gradient(
        circle,
        rgba(50, 69, 55, 0.07) 0%,
        transparent 68%
    );
    animation: driftA 32s ease-in-out infinite alternate;
}
.ambient::after {
    content: "";
    position: absolute;
    bottom: -8%;
    right: -8%;
    width: 45%;
    height: 45%;
    border-radius: 50%;
    background: radial-gradient(
        circle,
        rgba(50, 69, 55, 0.05) 0%,
        transparent 65%
    );
    animation: driftB 26s ease-in-out infinite alternate;
}

/* ─────────────────────────────────────────────
   NAVIGATION
───────────────────────────────────────────── */
#nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 28px 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition:
        background 500ms ease,
        backdrop-filter 500ms ease,
        border-color 400ms ease;
    border-bottom: 1px solid transparent;
}
#nav.scrolled {
    background: rgba(245, 247, 245, 0.88);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom-color: var(--border);
}

/* Skip-to-content ─────────────────────────── */
.skip-link {
    position: absolute;
    left: 24px;
    top: 16px;
    z-index: 200;
    padding: 10px 14px;
    background: var(--accent);
    color: var(--bg);
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    text-decoration: none;
    transform: translateY(-180%);
    transition: transform 220ms var(--ease);
}
.skip-link:focus-visible {
    transform: translateY(0);
}

.nav-mark {
    font-family: var(--mono);
    font-size: 12px;
    font-weight: 400;
    letter-spacing: 0.16em;
    color: var(--accent);
    text-decoration: none;
}
.nav-list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 16px 40px;
}
.nav-list a {
    font-size: 11px;
    font-weight: 400;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--muted);
    text-decoration: none;
    transition: color 200ms var(--ease);
}
.nav-list a:hover,
.nav-list a:focus-visible {
    color: var(--accent);
    outline: none;
}

/* ─────────────────────────────────────────────
   SCROLL REVEAL
───────────────────────────────────────────── */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition:
        opacity 750ms var(--ease) var(--d, 0ms),
        transform 750ms var(--ease) var(--d, 0ms);
}
.reveal.in {
    opacity: 1;
    transform: translateY(0);
}

/* ─────────────────────────────────────────────
   FOOTER
───────────────────────────────────────────── */
footer {
    position: relative;
    z-index: 1;
    padding: 28px 56px;
    border-top: 1px solid var(--border);
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}
footer span,
footer a {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--muted);
}
.footer-meta {
    display: inline-flex;
    align-items: center;
    justify-content: flex-end;
    gap: 10px;
}
footer a {
    text-decoration: none;
    transition: color 200ms var(--ease);
}
footer a:hover,
footer a:focus-visible {
    color: var(--accent);
    outline: none;
}
.footer-credit {
    text-transform: none;
}
.footer-left {
    display: flex;
    align-items: center;
    gap: 10px;
}
.footer-ig {
    display: flex;
    align-items: center;
    line-height: 0;
}
.footer-ig svg {
    width: 14px;
    height: 14px;
}

/* ─────────────────────────────────────────────
   RESPONSIVE
───────────────────────────────────────────── */
@media (max-width: 960px) {
    #nav,
    footer {
        padding-left: 28px;
        padding-right: 28px;
    }
}
@media (max-width: 720px) {
    #nav {
        align-items: flex-start;
        flex-direction: column;
        gap: 12px;
        padding-top: 20px;
        padding-bottom: 20px;
    }
    .nav-list {
        gap: 10px 16px;
    }
}

/* ─────────────────────────────────────────────
   CUE TRACK (scroll indicator)
───────────────────────────────────────────── */
.cue-track {
    width: 1px;
    height: 68px;
    background: var(--border);
    position: relative;
    overflow: hidden;
}
.cue-track::after {
    content: "";
    position: absolute;
    top: -60%;
    left: 0;
    width: 100%;
    height: 50%;
    background: var(--accent);
    animation: trackDrop 2s 1.8s ease-in-out infinite;
}
.cue-label {
    font-family: var(--mono);
    font-size: 9px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--muted);
    writing-mode: vertical-lr;
}