/* ============================================================
   iisugi.com — Reductive Architectural Design
   Cool-gray palette, no gradients, no warm tones
   ============================================================ */

/* --- CSS Custom Properties --- */
:root {
    /* Palette */
    --fog-white: #f4f4f8;
    --cloud-ash: #e8e8f0;
    --silver-veil: #d0d0da;
    --pewter-mist: #b0b0bc;
    --light-veil: #c0c0cc;
    --slate-echo: #8a8a9a;
    --graphite-dusk: #4a4a5a;
    --iron-shadow: #3a3a48;
    --obsidian-ink: #1a1a28;
    --highlight-cap: #f0f0f4;

    /* Typography scale */
    --hero-size: clamp(2rem, 5vw, 4rem);
    --heading-size: clamp(1.5rem, 3vw, 2.5rem);
    --pull-quote-size: clamp(1.2rem, 2.5vw, 2rem);
    --body-size: clamp(0.9rem, 1.1vw, 1.05rem);
    --caption-size: clamp(0.65rem, 0.8vw, 0.75rem);
    --mono-size: clamp(0.6rem, 0.7vw, 0.7rem);
    --nav-link-size: clamp(1.2rem, 2vw, 1.6rem);
    --subtitle-size: clamp(0.75rem, 1.2vw, 1rem);
    --colophon-size: clamp(0.9rem, 1.5vw, 1.2rem);

    /* Spacing */
    --gutter: clamp(24px, 3vw, 48px);
    --section-gap: clamp(120px, 15vh, 200px);
}

/* --- Reset & Base --- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    background-color: var(--fog-white);
    color: var(--iron-shadow);
    font-family: 'Libre Baskerville', serif;
    font-size: var(--body-size);
    line-height: 1.8;
    letter-spacing: 0.02em;
    overflow-x: hidden;
    position: relative;
}

/* --- Paper Grain Texture --- */
#paper-grain {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    opacity: 0.02;
}

#paper-grain svg {
    width: 100%;
    height: 100%;
}

/* --- Navigation Monogram --- */
#nav-monogram {
    position: fixed;
    top: 32px;
    left: 32px;
    z-index: 1000;
}

#nav-trigger {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: none;
    border: none;
    cursor: pointer;
    font-family: 'Cormorant Garamond', serif;
    font-style: italic;
    font-size: 14px;
    color: #9a9aaa;
    transition: color 200ms ease;
    padding: 0;
    line-height: 1;
}

#nav-trigger:hover {
    color: var(--graphite-dusk);
}

/* --- Navigation Overlay --- */
#nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: clamp(240px, 30vw, 360px);
    height: 100vh;
    background-color: var(--fog-white);
    border-right: 0.5px solid var(--silver-veil);
    z-index: 999;
    transform: translateX(-100%);
    transition: transform 300ms ease-out;
    display: flex;
    align-items: center;
}

#nav-overlay.is-open {
    transform: translateX(0);
}

#nav-overlay-inner {
    padding: 0 48px;
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.nav-link {
    font-family: 'Cormorant Garamond', serif;
    font-weight: 400;
    font-size: var(--nav-link-size);
    color: var(--graphite-dusk);
    text-decoration: none;
    letter-spacing: 0.15em;
    opacity: 0;
    transform: translateX(-20px);
    transition: opacity 400ms ease-out, transform 400ms ease-out, color 400ms ease;
}

#nav-overlay.is-open .nav-link {
    opacity: 1;
    transform: translateX(0);
}

.nav-link:hover {
    color: var(--obsidian-ink);
}

/* Nav link stagger delays */
#nav-overlay.is-open .nav-link[data-stagger="0"] { transition-delay: 60ms; }
#nav-overlay.is-open .nav-link[data-stagger="1"] { transition-delay: 120ms; }
#nav-overlay.is-open .nav-link[data-stagger="2"] { transition-delay: 180ms; }
#nav-overlay.is-open .nav-link[data-stagger="3"] { transition-delay: 240ms; }
#nav-overlay.is-open .nav-link[data-stagger="4"] { transition-delay: 300ms; }
#nav-overlay.is-open .nav-link[data-stagger="5"] { transition-delay: 360ms; }
#nav-overlay.is-open .nav-link[data-stagger="6"] { transition-delay: 420ms; }

/* Reset delays when closing */
#nav-overlay:not(.is-open) .nav-link {
    transition-delay: 0ms;
}

/* --- The Vestibule (Hero) --- */
.vestibule {
    width: 100%;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 1;
}

.vestibule-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.vestibule-title {
    font-family: 'Cormorant Garamond', serif;
    font-weight: 300;
    font-size: var(--hero-size);
    letter-spacing: 0.3em;
    color: var(--graphite-dusk);
    line-height: 1.3;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 600ms ease-out, transform 600ms ease-out;
    margin-right: -0.3em; /* compensate for letter-spacing */
}

.vestibule-title.is-revealed {
    opacity: 1;
    transform: translateY(0);
}

.vestibule-rule {
    width: 40vw;
    height: 0.5px;
    background-color: var(--light-veil); /* #c0c0cc */
    margin: 24px 0;
    opacity: 0;
    transition: opacity 400ms ease;
}

.vestibule-rule.is-revealed {
    opacity: 1;
}

.vestibule-subtitle {
    font-family: 'Libre Baskerville', serif;
    font-style: italic;
    font-size: var(--subtitle-size);
    color: var(--slate-echo);
    letter-spacing: 0.08em;
    opacity: 0;
    transform: translateY(6px);
    transition: opacity 600ms ease-out, transform 600ms ease-out;
}

.vestibule-subtitle.is-revealed {
    opacity: 1;
    transform: translateY(0);
}

/* --- Section Dividers --- */
.section-divider {
    width: 100%;
    height: 0.5px;
    background-color: var(--silver-veil);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 800ms ease-in-out;
    margin: 0;
}

.section-divider.is-revealed {
    transform: scaleX(1);
}

/* --- Passage Grid Layout --- */
.passage-section {
    position: relative;
    z-index: 1;
    padding: var(--section-gap) 0;
}

.passage-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 0 var(--gutter);
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--gutter);
}

/* Content positioned in left third (columns 2-5) */
.content-left {
    grid-column: 2 / 6;
}

/* Content positioned in right third (columns 8-11) */
.content-right {
    grid-column: 8 / 12;
}

/* --- Typography --- */
.section-heading {
    font-family: 'Cormorant Garamond', serif;
    font-weight: 300;
    font-size: var(--heading-size);
    color: var(--graphite-dusk);
    letter-spacing: 0.2em;
    line-height: 1.3;
    margin-bottom: 32px;
    transition: color 400ms ease;
}

.section-heading:hover {
    color: var(--obsidian-ink);
}

.body-text {
    font-family: 'Libre Baskerville', serif;
    font-weight: 400;
    font-size: var(--body-size);
    color: var(--iron-shadow);
    line-height: 1.8;
    letter-spacing: 0.02em;
    margin-bottom: 24px;
}

.body-text:last-child {
    margin-bottom: 0;
}

.pull-quote-container {
    position: relative;
    margin: 48px 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.pull-quote {
    font-family: 'Cormorant Garamond', serif;
    font-weight: 300;
    font-style: italic;
    font-size: var(--pull-quote-size);
    color: var(--graphite-dusk);
    letter-spacing: 0.05em;
    line-height: 1.5;
    text-align: center;
    position: relative;
    z-index: 2;
    padding: 24px 0;
}

.timestamp {
    font-family: 'DM Mono', monospace;
    font-weight: 300;
    font-size: var(--mono-size);
    color: #9a9aaa;
    letter-spacing: 0.12em;
    margin-top: 48px;
    display: block;
}

/* --- Photography Frames --- */
.photo-frame {
    margin-bottom: 24px;
    position: relative;
}

.photo-placeholder {
    aspect-ratio: 3 / 2;
    overflow: hidden;
    background-color: var(--highlight-cap); /* #f0f0f4 - photo highlight cap */
    filter: saturate(0.75) contrast(0.95);
    transition: filter 500ms ease;
}

.photo-placeholder svg {
    width: 100%;
    height: 100%;
    display: block;
}

.photo-placeholder.is-focused {
    filter: saturate(1) contrast(1);
}

.photo-caption {
    display: block;
    font-family: 'Libre Baskerville', serif;
    font-size: var(--caption-size);
    color: var(--slate-echo);
    letter-spacing: 0.08em;
    text-transform: lowercase;
    line-height: 1.5;
    margin-top: 8px;
}

/* --- Geometric Motifs --- */

/* Open Square */
.geo-open-square {
    position: absolute;
    width: 200px;
    height: 200px;
    opacity: 0.4;
    z-index: 0;
    pointer-events: none;
}

.content-left .geo-open-square {
    right: -120px;
    top: 20px;
}

.geo-open-square-2 {
    right: auto !important;
    left: -80px !important;
    top: auto !important;
    bottom: -60px !important;
}

.geo-open-square-3 {
    right: -150px !important;
    top: auto !important;
    bottom: 40px !important;
}

.geo-open-square rect {
    stroke-dasharray: 720;
    stroke-dashoffset: 720;
    transition: stroke-dashoffset 1200ms ease-in-out;
}

.geo-open-square.is-revealed rect {
    stroke-dashoffset: 0;
}

/* Bisected Circle */
.geo-bisected-circle {
    position: absolute;
    width: 240px;
    height: 240px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: opacity 800ms ease;
    z-index: 1;
    pointer-events: none;
}

.geo-bisected-circle.is-revealed {
    opacity: 0.2;
}

/* Parallel Lines */
.geo-parallel-lines {
    margin-top: 48px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.parallel-line {
    width: 400px;
    max-width: 100%;
    height: 0.5px;
    background-color: var(--silver-veil);
    opacity: 0;
    transition: opacity 500ms ease;
    transition-delay: var(--line-delay, 0ms);
}

.geo-parallel-lines.is-revealed .parallel-line {
    opacity: 0.35;
}

/* --- Reveal Animation System --- */
.reveal-item {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 500ms ease-out, transform 500ms ease-out;
    transition-delay: var(--reveal-delay, 0ms);
}

.reveal-item.is-revealed {
    opacity: 1;
    transform: translateY(0);
}

/* --- Colophon --- */
.colophon {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 50vh;
    padding-bottom: 200px;
    position: relative;
    z-index: 1;
}

.colophon-content {
    text-align: center;
}

.colophon-name {
    font-family: 'Cormorant Garamond', serif;
    font-weight: 300;
    font-size: var(--colophon-size);
    color: var(--pewter-mist);
    letter-spacing: 0.3em;
}

/* --- Responsive Adjustments --- */
@media (max-width: 1024px) {
    .content-left {
        grid-column: 2 / 7;
    }

    .content-right {
        grid-column: 7 / 12;
    }
}

@media (max-width: 768px) {
    .content-left,
    .content-right {
        grid-column: 2 / 12;
    }

    .vestibule-rule {
        width: 60vw;
    }

    #nav-monogram {
        top: 20px;
        left: 20px;
    }

    .passage-grid {
        padding: 0 20px;
    }

    .geo-open-square {
        width: 120px;
        height: 120px;
        opacity: 0.25;
    }

    .geo-open-square-2,
    .geo-open-square-3 {
        display: none;
    }

    .geo-bisected-circle {
        width: 160px;
        height: 160px;
    }

    .parallel-line {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .content-left,
    .content-right {
        grid-column: 1 / -1;
    }

    .vestibule-rule {
        width: 70vw;
    }

    .geo-open-square {
        display: none;
    }
}

/* --- Selection Style --- */
::selection {
    background-color: var(--cloud-ash);
    color: var(--obsidian-ink);
}