/* ============================================================
   bada.studio — styles.css
   "The Studio as a Tidepool" — grainy, paper-forward, hand-touched
   ============================================================ */

/* ---------- Tokens ---------- */
:root {
    /* Palette — muted coastal */
    --color-paper:   #EFE8DD; /* Dune  — page background */
    --color-ink:     #2C2A26; /* Kelp  — body text */
    --color-tide:    #5B7A84; /* Haenyeo Blue — accent */
    --color-sand:    #C8B9A1; /* Byeoreum — dividers */
    --color-salt:    #F6F1E8; /* Sogeum — elevated surface */
    --color-seal:    #1A1916; /* Meok — strongest ink */

    /* Spacing scale */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.5rem;
    --space-6: 2.25rem;
    --space-7: 3.5rem;
    --space-8: 5rem;
    --space-9: 7rem;

    /* Type scale anchored at 19px / 1.2 modular */
    --step--1: 0.875rem;
    --step-0:  1.1875rem; /* 19px */
    --step-1:  1.425rem;
    --step-2:  1.71rem;
    --step-3:  2.05rem;
    --step-4:  2.46rem;
    --step-5:  3.0rem;
    --step-6:  4.2rem;

    /* Layout */
    --measure: 64ch;
    --grain-opacity: 0.07;

    /* Fonts: EB Garamond (display + body), Inter (utility), Noto Serif KR */
    --font-serif: "EB Garamond", "Noto Serif KR", Georgia, serif;
    --font-sans:  "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
}

/* ---------- Reset (light) ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
img, svg { display: block; max-width: 100%; }
button { font: inherit; cursor: pointer; background: none; border: none; color: inherit; padding: 0; }
ul, ol { padding: 0; margin: 0; list-style: none; }
a { color: inherit; text-decoration: none; }

/* ---------- Base ---------- */
html {
    background: var(--color-paper);
    color: var(--color-ink);
    font-family: var(--font-serif);
    font-size: 100%;
    line-height: 1.65;
    scroll-behavior: smooth;
}
body {
    font-size: var(--step-0);
    color: rgba(44, 42, 38, 0.94);   /* 94% — ink absorbed into paper */
    background: var(--color-paper);
    overflow-x: hidden;
    position: relative;
    min-height: 100vh;
}

p { margin: 0 0 var(--space-5); max-width: var(--measure); }
strong { font-weight: 500; }
em { font-style: italic; }

/* ---------- Grain overlay ---------- */
.grain {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 50;
    opacity: var(--grain-opacity);
    mix-blend-mode: multiply;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='256' height='256'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.17  0 0 0 0 0.16  0 0 0 0 0.15  0 0 0 0.55 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
    background-size: 256px 256px;
}

/* ---------- Header & Primary Nav ---------- */
.site-header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 40;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-5) var(--space-6);
    background: linear-gradient(to bottom, rgba(239, 232, 221, 0.94) 0%, rgba(239, 232, 221, 0.0) 100%);
    backdrop-filter: blur(0.5px);
}

.studio-mark {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    color: var(--color-ink);
    font-family: var(--font-serif);
    font-size: var(--step-1);
    font-weight: 500;
    letter-spacing: 0.01em;
}
.studio-mark .wave-glyph {
    width: 36px;
    height: 18px;
    color: var(--color-tide);
}
.studio-name em {
    color: var(--color-tide);
    font-style: normal;
}

.primary-nav ul {
    display: flex;
    gap: var(--space-6);
}
.nav-link {
    font-family: var(--font-sans);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--color-ink);
    padding: var(--space-2) 0;
    position: relative;
    transition: color 220ms ease;
}
.nav-link::after {
    content: "";
    position: absolute;
    left: 0; right: 100%;
    bottom: 0;
    height: 1px;
    background: var(--color-tide);
    transition: right 600ms cubic-bezier(.2,.6,.2,1);
}
.nav-link:hover { color: var(--color-tide); }
.nav-link:hover::after { right: 0; }
.nav-link.is-current { color: var(--color-tide); }
.nav-link.is-current::after { right: 0; }

/* Mobile nav toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 28px;
    height: 22px;
    justify-content: center;
}
.nav-toggle span {
    display: block;
    height: 1.5px;
    background: var(--color-ink);
    transition: transform 300ms ease, opacity 200ms ease;
}

/* Mobile nav overlay */
.mobile-nav {
    position: fixed;
    inset: 0;
    z-index: 90;
    background: var(--color-paper);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}
.mobile-nav[hidden] { display: none; }
.mobile-nav .grain { z-index: 1; }
.mobile-nav-close {
    position: absolute;
    top: var(--space-5);
    right: var(--space-6);
    font-size: 2.4rem;
    line-height: 1;
    color: var(--color-ink);
    z-index: 2;
}
.mobile-nav ul {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
    text-align: center;
}
.mobile-nav a {
    font-family: var(--font-serif);
    font-size: var(--step-5);
    font-weight: 400;
    color: var(--color-ink);
    transition: color 240ms ease;
}
.mobile-nav a:hover { color: var(--color-tide); }

/* ---------- Section rail (right vertical) ---------- */
.section-rail {
    position: fixed;
    top: 50%;
    right: var(--space-5);
    transform: translateY(-50%);
    z-index: 30;
}
.section-rail ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}
.rail-tick {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    height: 18px;
    color: var(--color-ink);
    position: relative;
}
.rail-tick::before {
    content: "";
    display: block;
    width: 18px;
    height: 1px;
    background: var(--color-ink);
    opacity: 0.45;
    transition: width 320ms ease, background 320ms ease, opacity 320ms ease;
}
.rail-tick.is-active::before {
    width: 32px;
    background: var(--color-tide);
    opacity: 1;
}
.rail-label {
    font-family: var(--font-sans);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    opacity: 0;
    transform: translateX(-4px);
    transition: opacity 240ms ease, transform 240ms ease;
    color: var(--color-ink);
}
.rail-tick:hover .rail-label,
.rail-tick.is-active .rail-label {
    opacity: 1;
    transform: translateX(0);
}

/* ---------- Panels ---------- */
main { padding-top: var(--space-9); }

.panel {
    position: relative;
    padding: var(--space-8) var(--space-7);
    container-type: inline-size;
}

.panel-split {
    display: grid;
    gap: var(--space-7);
    align-items: center;
    min-height: 88vh;
}
.panel-50-50 { grid-template-columns: 1fr 1fr; }
.panel-60-40 { grid-template-columns: 1.5fr 1fr; }
.panel-45-55 { grid-template-columns: 1fr 1.22fr; }
.panel-55-45 { grid-template-columns: 1.22fr 1fr; }

.panel-half {
    position: relative;
    padding-block: var(--space-5);
}
.panel-illustration { display: flex; justify-content: center; align-items: center; }

.panel-light {
    background: var(--color-salt);
    padding: var(--space-7);
    border: 1px solid rgba(200, 185, 161, 0.6);
}

.panel-banner {
    text-align: center;
    padding: var(--space-9) var(--space-6) var(--space-7);
    border-block: 1px solid var(--color-sand);
    margin-block: var(--space-6);
}
.panel-banner--alt {
    background: var(--color-salt);
    border-block: 1px solid var(--color-sand);
}
.banner-lede {
    margin-inline: auto;
    margin-top: var(--space-4);
    font-style: italic;
    color: rgba(44, 42, 38, 0.78);
}

.panel-group { padding: 0; }

/* ---------- Typography ---------- */
.display-heading {
    font-family: var(--font-serif);
    font-weight: 400;
    color: var(--color-ink);
    line-height: 1.05;
    letter-spacing: -0.01em;
    margin: var(--space-3) 0 var(--space-6);
    font-size: clamp(2.4rem, 6vw + 1rem, 4.8rem);
}
.display-heading em {
    color: var(--color-tide);
    font-style: italic;
}
.display-heading--md {
    font-size: clamp(1.8rem, 3vw + 0.8rem, 2.6rem);
    line-height: 1.18;
}
.display-heading--lg {
    font-size: clamp(2.2rem, 4vw + 0.8rem, 3.6rem);
}
.display-heading--xl {
    font-size: clamp(2.6rem, 6vw + 1rem, 5.2rem);
    margin-inline: auto;
    max-width: 16ch;
}

.utility-label {
    font-family: var(--font-sans);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: rgba(44, 42, 38, 0.7);
    margin: 0 0 var(--space-4);
    display: inline-flex;
    align-items: center;
    gap: var(--space-3);
}
.utility-label .separator { opacity: 0.55; }

.lede {
    font-size: var(--step-1);
    line-height: 1.6;
    margin-bottom: var(--space-6);
    max-width: 56ch;
}

/* Drop cap */
.dropcap {
    float: left;
    font-family: var(--font-serif);
    font-size: 3.2em;
    line-height: 0.92;
    color: var(--color-tide);
    padding: 0.05em var(--space-3) 0 0;
    margin-top: 0.04em;
    font-weight: 500;
}

/* Pull quote */
.pull-quote {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: var(--step-2);
    color: var(--color-ink);
    border-inline-start: 1px solid var(--color-tide);
    padding-inline-start: var(--space-5);
    margin: var(--space-6) 0;
    max-width: 50ch;
}

/* ---------- Underline-draw link ---------- */
.underline-link {
    position: relative;
    display: inline-block;
    color: var(--color-ink);
    font-family: var(--font-serif);
    font-size: var(--step-0);
    padding-bottom: 4px;
    background-image: linear-gradient(to right, var(--color-tide), var(--color-tide));
    background-repeat: no-repeat;
    background-position: 0 100%;
    background-size: 0% 1.5px;
    transition: background-size 600ms cubic-bezier(.2,.6,.2,1), color 240ms ease;
    border-bottom: 1px dotted rgba(44, 42, 38, 0.35);
}
.underline-link:hover,
.underline-link.is-drawn {
    background-size: 100% 1.5px;
    color: var(--color-tide);
}

/* ---------- CTA Button ---------- */
.cta-button {
    display: inline-block;
    font-family: var(--font-serif);
    font-size: var(--step-0);
    color: var(--color-ink);
    border: 1px solid var(--color-ink);
    padding: var(--space-3) var(--space-5);
    margin-top: var(--space-4);
    transition: border-width 240ms ease, background 320ms ease, color 240ms ease, padding 240ms ease;
    letter-spacing: 0.01em;
    line-height: 1.2;
}
.cta-button:hover {
    background: var(--color-salt);
    border-color: var(--color-seal);
    box-shadow: inset 0 0 0 1px var(--color-seal);
    color: var(--color-seal);
}
.cta-button--filled {
    background: var(--color-ink);
    color: var(--color-paper);
}
.cta-button--filled:hover {
    background: var(--color-seal);
    color: var(--color-salt);
    box-shadow: inset 0 0 0 1px var(--color-seal);
}

/* ---------- Tide drift line ---------- */
.tide-drift-line {
    position: relative;
    height: 1px;
    width: 220px;
    margin: var(--space-6) 0 0;
    background: var(--color-tide);
    opacity: 0.5;
    transform-origin: left center;
    animation: tide-drift 12s ease-in-out infinite;
}
@keyframes tide-drift {
    0%, 100% { transform: translateX(-6px); }
    50%      { transform: translateX(6px); }
}

/* ---------- Illustrations ---------- */
.illustration {
    width: min(100%, 460px);
    max-height: 560px;
    margin: 0 auto;
}
.draw-path {
    transition: stroke-dashoffset 1100ms cubic-bezier(.2,.6,.2,1);
}
.draw-path.is-undrawn { /* set by JS, hides until in-view */
    stroke-dashoffset: var(--dash-len, 1000);
}

/* ---------- Work meta list ---------- */
.work-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
    margin: 0 0 var(--space-5);
    font-family: var(--font-sans);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: rgba(44, 42, 38, 0.7);
}
.work-meta li {
    position: relative;
    padding-inline-end: var(--space-4);
}
.work-meta li:not(:last-child)::after {
    content: "·";
    position: absolute;
    right: 0; top: 0;
    color: var(--color-sand);
}

/* ---------- Practice steps ---------- */
.practice-steps {
    margin: var(--space-5) 0 var(--space-6);
    counter-reset: step;
    display: grid;
    gap: var(--space-4);
}
.practice-steps li {
    display: grid;
    grid-template-columns: 56px 1fr;
    gap: var(--space-4);
    align-items: baseline;
    padding-block-end: var(--space-4);
    border-block-end: 1px solid var(--color-sand);
}
.practice-steps li:last-child { border-block-end: none; }
.step-number {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: var(--step-2);
    color: var(--color-tide);
}
.step-body { color: var(--color-ink); }

/* ---------- Tag rail (Journal) ---------- */
.tag-rail {
    display: flex;
    justify-content: center;
    gap: var(--space-5);
    margin-top: var(--space-5);
}
.tag-link {
    font-family: var(--font-sans);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--color-ink);
    padding-block-end: var(--space-1);
    border-block-end: 1px solid var(--color-sand);
    transition: color 240ms ease, border-color 240ms ease;
}
.tag-link:hover {
    color: var(--color-tide);
    border-color: var(--color-tide);
}

/* ---------- Journal list ---------- */
.journal-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-7) var(--space-8);
    padding: var(--space-7) var(--space-7) var(--space-9);
    max-width: 1200px;
    margin: 0 auto;
}
.journal-entry {
    border-block-start: 1px solid var(--color-sand);
    padding-block-start: var(--space-5);
    transition: border-color 320ms ease;
}
.journal-entry:hover { border-block-start-color: var(--color-tide); }

.entry-heading {
    font-family: var(--font-serif);
    font-weight: 400;
    font-size: var(--step-3);
    line-height: 1.18;
    margin: 0 0 var(--space-4);
}
.entry-excerpt {
    color: rgba(44, 42, 38, 0.86);
    max-width: 48ch;
}

.new-asterisk {
    display: inline-flex;
    width: 14px;
    height: 14px;
    margin-inline-start: var(--space-2);
}
.new-asterisk svg { width: 100%; height: 100%; }

/* ---------- Contact ---------- */
.panel-contact {
    background: var(--color-salt);
    padding: var(--space-9) var(--space-6);
    border-block: 1px solid var(--color-sand);
}
.contact-inner {
    max-width: 720px;
    margin: 0 auto;
}
.contact-lede {
    font-size: var(--step-1);
    margin-bottom: var(--space-7);
    color: rgba(44, 42, 38, 0.86);
}

.contact-form {
    display: grid;
    gap: var(--space-5);
    margin-bottom: var(--space-7);
}
.form-row {
    display: grid;
    gap: var(--space-2);
}
.form-row label {
    font-family: var(--font-sans);
    font-size: 0.74rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: rgba(44, 42, 38, 0.78);
}
.form-row input,
.form-row textarea {
    background: transparent;
    border: none;
    border-block-end: 1px solid var(--color-ink);
    padding: var(--space-3) 0;
    font-family: var(--font-serif);
    font-size: var(--step-0);
    color: var(--color-ink);
    resize: vertical;
    transition: border-color 240ms ease;
}
.form-row input:focus,
.form-row textarea:focus {
    outline: none;
    border-block-end-color: var(--color-tide);
}

.form-status {
    margin: var(--space-3) 0 0;
    font-family: var(--font-sans);
    font-size: 0.85rem;
    color: var(--color-tide);
    min-height: 1.4em;
}

.contact-meta {
    border-block-start: 1px solid var(--color-sand);
    padding-block-start: var(--space-5);
    color: rgba(44, 42, 38, 0.82);
}

/* ---------- Footer ---------- */
.site-footer {
    padding: var(--space-7) var(--space-6);
    text-align: center;
    border-block-start: 1px solid var(--color-sand);
    color: rgba(44, 42, 38, 0.7);
    font-family: var(--font-sans);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
}
.site-footer p {
    display: inline-flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    justify-content: center;
    margin: 0;
}
.site-footer .separator { opacity: 0.55; }

/* ---------- Paper-lift hover ---------- */
.work-panel { transition: background 360ms ease; }
.work-panel:hover { background: rgba(246, 241, 232, 0.55); }

/* ---------- Container queries (split panels) ---------- */
@container (max-width: 720px) {
    .panel-split {
        grid-template-columns: 1fr !important;
        gap: var(--space-6);
    }
    .panel-illustration { order: 2; }
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
    .section-rail { display: none; }
    .panel { padding: var(--space-7) var(--space-5); }
    .panel-split { grid-template-columns: 1fr; min-height: auto; }
    .panel-illustration { order: 2; }
    .journal-list { grid-template-columns: 1fr; padding: var(--space-6) var(--space-5); gap: var(--space-6); }
}

@media (max-width: 720px) {
    .primary-nav { display: none; }
    .nav-toggle { display: flex; }
    .site-header { padding: var(--space-4) var(--space-5); }
    main { padding-top: var(--space-7); }
    .display-heading { font-size: clamp(2rem, 8vw, 3rem); }
    .display-heading--xl { font-size: clamp(2.2rem, 8vw, 3.4rem); }
    .panel-banner { padding: var(--space-7) var(--space-4); }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    .tide-drift-line { animation: none; }
    .draw-path { stroke-dashoffset: 0 !important; }
}