/* ==========================================================================
   yongjoon.dev — Rain on Stone
   Japanese zen portfolio with karesansui garden composition
   ========================================================================== */

/* --- Custom Properties --- */
:root {
    --washi: #F4F2EE;
    --keshizumi: #E8E4DD;
    --sumi: #2B2B2B;
    --usuzumi: #6B7280;
    --ai: #4A6FA5;
    --kitsuchi: #B8860B;
    --nezumi: #9BA3AF;
    --yoru: #1A1D23;

    --font-display: 'Zen Kaku Gothic New', sans-serif;
    --font-body: 'Space Grotesk', sans-serif;
    --font-mono: 'IBM Plex Mono', monospace;

    --baseline: 1.5rem; /* 24px at root */
    --engawa-width: 48px;

    --ease-enter: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-exit: cubic-bezier(0, 0, 0.2, 1);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    background-color: var(--washi);
    color: var(--sumi);
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(0.9rem, 1.1vw, 1.05rem);
    letter-spacing: 0.01em;
    line-height: 1.7;
    overflow-x: hidden;
    cursor: default;
}

a {
    color: var(--ai);
    text-decoration: none;
    transition: color 300ms var(--ease-enter);
}

a:hover {
    color: var(--kitsuchi);
}

/* --- Engawa Navigation --- */
.engawa-nav {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--engawa-width);
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: calc(var(--baseline) * 2);
    z-index: 100;
    background: transparent;
}

.engawa-monogram {
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 400;
    letter-spacing: 0.03em;
    color: var(--sumi);
    margin-bottom: calc(var(--baseline) * 3);
    user-select: none;
}

.engawa-dots {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: calc(var(--baseline) * 1.5);
}

.engawa-dot {
    position: relative;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--nezumi);
    border: none;
    cursor: pointer;
    padding: 0;
    transition: height 400ms var(--ease-enter),
                border-radius 400ms var(--ease-enter),
                background-color 400ms var(--ease-enter);
}

.engawa-dot.active {
    height: 24px;
    border-radius: 3px;
    background: var(--ai);
}

.engawa-label {
    position: absolute;
    left: calc(100% + 8px);
    top: 50%;
    transform: translateY(-50%);
    white-space: nowrap;
    font-family: var(--font-body);
    font-size: 11px;
    font-weight: 500;
    color: var(--sumi);
    opacity: 0;
    transition: opacity 300ms var(--ease-enter);
    pointer-events: none;
}

.engawa-dot:hover .engawa-label {
    opacity: 0.6;
}

/* --- Ma (Negative Space) --- */
.ma-space {
    height: 20vh;
}

.ma-space-small {
    height: 10vh;
}

/* --- Section: Tokonoma (Hero) --- */
.section-tokonoma {
    min-height: 100vh;
    display: flex;
    align-items: flex-start;
    padding-left: calc(var(--engawa-width) + 8.333vw); /* column 2 of 12 */
    padding-right: calc(var(--baseline) * 2);
}

.tokonoma-content {
    padding-top: 38vh; /* golden ratio vertical point */
    max-width: 900px;
}

.hero-name {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(3rem, 8vw, 7rem);
    letter-spacing: 0.02em;
    line-height: 1.15;
    color: var(--sumi);
    opacity: 0;
    transform: translateY(8px);
    animation: fadeInUp 800ms var(--ease-enter) 200ms forwards;
}

.hero-subtitle {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(0.9rem, 1.1vw, 1.05rem);
    color: var(--usuzumi);
    margin-top: var(--baseline);
    letter-spacing: 0.01em;
    line-height: 1.7;
    opacity: 0;
    transform: translateY(8px);
    animation: fadeInUp 800ms var(--ease-enter) 600ms forwards;
}

/* --- Horizon Lines --- */
.horizon-line {
    position: relative;
    width: 100%;
    overflow: visible;
    padding-left: calc(var(--engawa-width) + 8.333vw);
}

.horizon-line-1 {
    margin-top: calc(var(--baseline) * 1.5);
    padding-left: 0;
    opacity: 0;
    animation: fadeIn 400ms var(--ease-enter) 1000ms forwards;
}

.horizon-svg {
    width: 100%;
    height: 2px;
    display: block;
}

.horizon-stroke {
    stroke: var(--nezumi);
    stroke-width: 1;
    stroke-dasharray: 1200;
    stroke-dashoffset: 1200;
}

.horizon-line.animate .horizon-stroke {
    animation: drawLine 1200ms ease-out forwards;
}

.horizon-line-1 .horizon-stroke {
    animation: drawLine 1200ms ease-out 1200ms forwards;
}

.horizon-stroke-light {
    stroke: var(--washi);
}

/* --- Section: Stone Garden (Projects) --- */
.section-stone-garden {
    padding-left: var(--engawa-width);
    padding-right: calc(var(--baseline) * 2);
}

.section-stone-garden .section-heading {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: clamp(1.25rem, 2.5vw, 2rem);
    letter-spacing: 0.02em;
    line-height: 1.15;
    color: var(--sumi);
    padding-left: 8.333vw;
    margin-bottom: calc(var(--baseline) * 3);
}

.garden-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--baseline);
    padding: 0 calc(var(--baseline));
}

/* Project cards — stone placement (fukinsei) */
.stone-card {
    background: var(--keshizumi);
    background-image: radial-gradient(circle, rgba(155, 163, 175, 0.08) 1px, transparent 1px);
    background-size: 24px 24px;
    border: 1px solid rgba(155, 163, 175, 0.2);
    border-radius: 0;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
    padding: calc(var(--baseline) * 1.5);
    transition: box-shadow 300ms var(--ease-enter),
                border-color 300ms var(--ease-enter);
    opacity: 0;
    transform: translateY(12px);
}

.stone-card.visible {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 500ms var(--ease-enter),
                transform 500ms var(--ease-enter),
                box-shadow 300ms var(--ease-enter),
                border-color 300ms var(--ease-enter);
}

.stone-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    border-color: rgba(155, 163, 175, 0.5);
}

/* Irregular grid placement — karesansui composition */
.stone-card-1 {
    grid-column: 2 / 7;
    grid-row: 1;
}

.stone-card-2 {
    grid-column: 9 / 12;
    grid-row: 1;
}

.stone-card-3 {
    grid-column: 1 / 5;
    grid-row: 2;
}

.stone-card-4 {
    grid-column: 6 / 11;
    grid-row: 2;
}

.stone-card-5 {
    grid-column: 3 / 7;
    grid-row: 3;
}

.card-title {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: clamp(1.1rem, 1.5vw, 1.35rem);
    letter-spacing: 0.02em;
    line-height: 1.15;
    color: var(--sumi);
    margin-bottom: calc(var(--baseline) * 0.5);
}

.card-description {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(0.85rem, 1vw, 0.95rem);
    color: var(--usuzumi);
    line-height: 1.7;
    margin-bottom: calc(var(--baseline) * 0.75);
}

.card-tech {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 0.75rem;
    letter-spacing: 0.03em;
    line-height: 1.6;
    color: var(--usuzumi);
}

/* --- Section: Meditation Bench (About) --- */
.section-meditation {
    padding-left: calc(var(--engawa-width) + 16.666vw); /* column 3 on desktop */
    padding-right: calc(var(--baseline) * 2);
}

.meditation-content {
    max-width: 600px;
}

.section-meditation .section-heading {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: clamp(1.25rem, 2.5vw, 2rem);
    letter-spacing: 0.02em;
    line-height: 1.15;
    color: var(--sumi);
    margin-bottom: calc(var(--baseline) * 2);
}

.meditation-text {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(0.9rem, 1.1vw, 1.05rem);
    letter-spacing: 0.01em;
    line-height: 1.7;
    color: var(--sumi);
    margin-bottom: var(--baseline);
    opacity: 0;
    transition: opacity 600ms var(--ease-enter);
}

.meditation-text.visible {
    opacity: 1;
}

/* --- Section: Gate (Footer) --- */
.section-gate {
    background-color: var(--yoru);
    padding: calc(var(--baseline) * 4) calc(var(--baseline) * 2);
    padding-left: var(--engawa-width);
}

.section-gate .horizon-line {
    padding-left: 8.333vw;
    margin-bottom: calc(var(--baseline) * 3);
}

.gate-content {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: calc(var(--baseline) * 3);
    flex-wrap: wrap;
}

.gate-link {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(0.85rem, 1vw, 0.95rem);
    color: var(--washi);
    letter-spacing: 0.01em;
    transition: color 300ms var(--ease-enter);
}

.gate-link:hover {
    color: var(--kitsuchi);
}

.gate-year {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 0.85rem;
    letter-spacing: 0.03em;
    color: var(--washi);
    opacity: 0.6;
}

/* --- Cursor Glow (Rake) --- */
.cursor-glow {
    position: fixed;
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(74, 111, 165, 0.03) 0%, transparent 70%);
    pointer-events: none;
    z-index: 9999;
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: opacity 300ms var(--ease-enter);
}

.cursor-glow.active {
    opacity: 1;
}

/* Custom crosshair cursor for empty space */
body.cursor-rake {
    cursor: crosshair;
}

/* --- Animations --- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes drawLine {
    from {
        stroke-dashoffset: 1200;
    }
    to {
        stroke-dashoffset: 0;
    }
}

/* --- Responsive: Mobile (below 768px) --- */
@media (max-width: 767px) {
    :root {
        --engawa-width: 0px;
    }

    .engawa-nav {
        position: fixed;
        left: 0;
        top: auto;
        bottom: 0;
        width: 100%;
        height: 48px;
        flex-direction: row;
        justify-content: center;
        align-items: center;
        padding-top: 0;
        padding: 0 var(--baseline);
        background: rgba(244, 242, 238, 0.95);
        backdrop-filter: blur(8px);
        -webkit-backdrop-filter: blur(8px);
        border-top: 1px solid rgba(155, 163, 175, 0.2);
    }

    .engawa-monogram {
        margin-bottom: 0;
        margin-right: calc(var(--baseline) * 2);
    }

    .engawa-dots {
        flex-direction: row;
        gap: calc(var(--baseline) * 1.5);
    }

    .engawa-dot.active {
        height: 6px;
        width: 24px;
        border-radius: 3px;
    }

    .engawa-label {
        left: 50%;
        top: auto;
        bottom: calc(100% + 8px);
        transform: translateX(-50%);
    }

    .section-tokonoma {
        padding-left: calc(var(--baseline) * 1.5);
        padding-right: calc(var(--baseline) * 1.5);
    }

    .tokonoma-content {
        padding-top: 30vh;
    }

    .section-stone-garden {
        padding-left: calc(var(--baseline) * 1.5);
        padding-right: calc(var(--baseline) * 1.5);
    }

    .section-stone-garden .section-heading {
        padding-left: 0;
    }

    .garden-grid {
        display: flex;
        flex-direction: column;
        gap: var(--baseline);
        padding: 0;
    }

    .stone-card-1,
    .stone-card-2,
    .stone-card-3,
    .stone-card-4,
    .stone-card-5 {
        grid-column: auto;
        grid-row: auto;
    }

    .section-meditation {
        padding-left: calc(var(--baseline) * 1.5);
        padding-right: calc(var(--baseline) * 1.5);
    }

    .horizon-line {
        padding-left: calc(var(--baseline) * 1.5);
    }

    .section-gate {
        padding-left: calc(var(--baseline) * 1.5);
        padding-bottom: calc(var(--baseline) * 2 + 48px); /* account for bottom nav */
    }

    .section-gate .horizon-line {
        padding-left: 0;
    }

    .gate-content {
        flex-direction: column;
        gap: var(--baseline);
        text-align: center;
    }

    .ma-space {
        height: 12vh;
    }

    .cursor-glow {
        display: none;
    }
}

/* --- Tablet (768px - 1199px) --- */
@media (min-width: 768px) and (max-width: 1199px) {
    .garden-grid {
        grid-template-columns: repeat(8, 1fr);
    }

    .stone-card-1 {
        grid-column: 1 / 5;
    }

    .stone-card-2 {
        grid-column: 5 / 8;
    }

    .stone-card-3 {
        grid-column: 1 / 4;
    }

    .stone-card-4 {
        grid-column: 4 / 8;
    }

    .stone-card-5 {
        grid-column: 2 / 6;
    }
}

/* Engawa color inversion for gate section */
.engawa-nav.inverted .engawa-monogram {
    color: var(--washi);
}

.engawa-nav.inverted .engawa-dot {
    background: rgba(244, 242, 238, 0.5);
}

.engawa-nav.inverted .engawa-dot.active {
    background: var(--washi);
}

.engawa-nav.inverted .engawa-label {
    color: var(--washi);
}