/* ============================================================
   hil.st -- Swiss International Style Grid System
   ============================================================ */

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

:root {
    --ink-black: #1a1a1a;
    --graphite: #3d3d3d;
    --slate: #6b6b6b;
    --grid-medium: #9a9a9a;
    --grid-light: #c8c8c8;
    --paper: #f5f5f3;
    --bright-white: #ffffff;
    --grid-line-light: #d0d0d0;

    --font-heading: 'Space Grotesk', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'Space Mono', monospace;

    --container: 1440px;
    --gutter: 24px;
    --columns: 12;
    --baseline: 8px;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(0.95rem, 1.1vw, 1.1rem);
    line-height: 1.7;
    letter-spacing: 0.005em;
    color: var(--ink-black);
    background-color: var(--paper);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Baseline Grid (always visible) */
body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
    background: repeating-linear-gradient(
        to bottom,
        rgba(0, 0, 0, 0.03) 0px,
        rgba(0, 0, 0, 0.03) 1px,
        transparent 1px,
        transparent 8px
    );
}

/* ============================================================
   Grid Overlay (Column Rules)
   ============================================================ */

.grid-overlay {
    position: fixed;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: var(--container);
    height: 100vh;
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 0 var(--gutter);
    padding: 0 var(--gutter);
    pointer-events: none;
    z-index: 2;
}

.grid-column {
    position: relative;
    border-right: 1px solid rgba(200, 200, 200, 0.15);
    transform: scaleY(0);
    transform-origin: top;
    transition: none;
}

.grid-column:first-child {
    border-left: 1px solid rgba(200, 200, 200, 0.15);
}

.grid-column.revealed {
    transform: scaleY(1);
}

.grid-column.highlight {
    border-right-color: rgba(200, 200, 200, 0.4);
}

.grid-column:first-child.highlight {
    border-left-color: rgba(200, 200, 200, 0.4);
}

.grid-label {
    position: absolute;
    top: 12px;
    left: 4px;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.04em;
    color: var(--grid-medium);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.grid-column.labels-visible .grid-label {
    opacity: 1;
}

/* Intersection markers */
.grid-column::after {
    content: '';
    position: absolute;
    top: 0;
    right: -2px;
    width: 3px;
    height: 3px;
    background: var(--grid-light);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.grid-column.labels-visible::after {
    opacity: 1;
}

/* ============================================================
   Crosshair System
   ============================================================ */

.crosshair {
    position: fixed;
    pointer-events: none;
    z-index: 3;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.crosshair-v {
    top: 0;
    width: 1px;
    height: 100vh;
    background: rgba(200, 200, 200, 0.4);
}

.crosshair-h {
    left: 0;
    width: 100vw;
    height: 1px;
    background: rgba(200, 200, 200, 0.4);
}

.crosshair.active {
    opacity: 1;
}

/* ============================================================
   Entry Screen
   ============================================================ */

.entry-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: var(--paper);
    display: flex;
    align-items: center;
    z-index: 100;
    padding-left: calc((100% - var(--container)) / 2 + var(--gutter));
    opacity: 1;
    transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.entry-screen.fade-out {
    opacity: 0;
    pointer-events: none;
}

.entry-screen.hidden {
    display: none;
}

.entry-title-wrap {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: clamp(2.4rem, 6vw, 5rem);
    letter-spacing: 0.12em;
    color: var(--ink-black);
    text-transform: lowercase;
}

.entry-char {
    display: inline-block;
    opacity: 0;
    transform: translateX(-12px);
    transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1), transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.entry-char.visible {
    opacity: 1;
    transform: translateX(0);
}

/* ============================================================
   Main Content
   ============================================================ */

.main-content {
    position: relative;
    z-index: 5;
    opacity: 0;
    transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--gutter);
}

.main-content.visible {
    opacity: 1;
}

/* ============================================================
   Header Zone
   ============================================================ */

.header {
    padding-top: calc(var(--baseline) * 4);
    padding-bottom: calc(var(--baseline) * 2);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
}

.site-title {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.2rem;
    letter-spacing: 0.12em;
    color: var(--ink-black);
    text-transform: lowercase;
}

.main-nav {
    display: flex;
    gap: calc(var(--gutter) * 2);
}

.nav-link {
    font-family: var(--font-heading);
    font-weight: 500;
    font-size: 0.75rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--ink-black);
    text-decoration: none;
    position: relative;
    padding-bottom: 10px;
    background-image: linear-gradient(var(--graphite), var(--graphite));
    background-size: 0% 1px;
    background-position: 0 100%;
    background-repeat: no-repeat;
    transition: background-size 0.25s ease, color 0.2s ease;
}

.nav-link:hover {
    color: var(--graphite);
    background-size: 100% 1px;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) scale(1);
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--ink-black);
    animation: dot-appear 0.2s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes dot-appear {
    from { transform: translateX(-50%) scale(0); }
    to { transform: translateX(-50%) scale(1); }
}

.header-rule {
    width: 100%;
    height: 1px;
    background: var(--ink-black);
    margin-top: calc(var(--baseline) * 2);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.header-rule.revealed {
    transform: scaleX(1);
}

/* ============================================================
   Hero Zone
   ============================================================ */

.hero {
    padding: calc(var(--baseline) * 4) 0;
}

.hero-inner {
    width: 100%;
}

.hero-image-container {
    width: 100%;
    overflow: hidden;
    border: 1px solid var(--ink-black);
}

.hero-image {
    width: 100%;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.hero-image-container:hover .hero-image {
    transform: scale(1.02);
}

.hero-image svg {
    display: block;
    width: 100%;
    height: auto;
}

/* ============================================================
   Content Sections
   ============================================================ */

.content-section {
    padding: calc(var(--baseline) * 4) 0;
}

/* Section Dividers */
.section-divider {
    position: relative;
    margin-bottom: calc(var(--baseline) * 6);
}

.divider-line {
    width: 100%;
    height: 1px;
    background: var(--ink-black);
}

.divider-label {
    position: absolute;
    right: 0;
    top: calc(var(--baseline) * 1);
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.04em;
    color: var(--grid-medium);
}

/* Content Grid */
.content-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--gutter);
    margin-bottom: calc(var(--baseline) * 8);
}

.content-grid:nth-child(odd) {
    grid-template-columns: 1fr 2fr;
}

/* Reverse order for alternating rows */
.content-grid:nth-child(odd) .content-card--narrow {
    order: -1;
}

/* Content Cards */
.content-card {
    display: flex;
    flex-direction: column;
    gap: calc(var(--baseline) * 2);
}

.card-image-wrap {
    overflow: hidden;
    border: 1px solid var(--ink-black);
}

.card-image {
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.card-image-wrap:hover .card-image {
    transform: scale(1.02);
}

.card-image svg {
    display: block;
    width: 100%;
    height: auto;
}

.card-meta {
    display: flex;
    flex-direction: column;
    gap: calc(var(--baseline) * 1);
}

.card-coord {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.04em;
    color: var(--grid-medium);
}

.card-title {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: clamp(1.1rem, 2vw, 1.6rem);
    letter-spacing: -0.02em;
    line-height: 1.1;
    color: var(--ink-black);
    transition: letter-spacing 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
}

.card-title:hover {
    letter-spacing: 0.01em;
}

.card-desc {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(0.95rem, 1.1vw, 1.1rem);
    line-height: 1.7;
    letter-spacing: 0.005em;
    color: var(--ink-black);
}

.card-date {
    font-family: var(--font-body);
    font-weight: 500;
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--slate);
}

/* ============================================================
   About Section
   ============================================================ */

.about-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: calc(var(--gutter) * 3);
}

.section-heading {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: clamp(1.8rem, 4vw, 3.6rem);
    letter-spacing: -0.02em;
    line-height: 1.1;
    color: var(--ink-black);
    margin-bottom: calc(var(--baseline) * 4);
    transition: letter-spacing 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
}

.section-heading:hover {
    letter-spacing: 0.01em;
}

.body-text {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(0.95rem, 1.1vw, 1.1rem);
    line-height: 1.7;
    letter-spacing: 0.005em;
    color: var(--ink-black);
    margin-bottom: calc(var(--baseline) * 3);
}

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

.about-details {
    display: flex;
    flex-direction: column;
    gap: calc(var(--baseline) * 4);
    padding-top: calc(var(--baseline) * 8);
}

.detail-block {
    display: flex;
    flex-direction: column;
    gap: calc(var(--baseline) * 0.5);
}

.detail-label {
    font-family: var(--font-body);
    font-weight: 500;
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--slate);
}

.detail-value {
    font-family: var(--font-heading);
    font-weight: 500;
    font-size: 1rem;
    color: var(--ink-black);
}

/* ============================================================
   Contact Section
   ============================================================ */

.contact-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: calc(var(--gutter) * 3);
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: calc(var(--baseline) * 4);
    padding-top: calc(var(--baseline) * 8);
}

.contact-item {
    display: flex;
    flex-direction: column;
    gap: calc(var(--baseline) * 0.5);
}

.contact-link {
    font-family: var(--font-heading);
    font-weight: 500;
    font-size: 1rem;
    color: var(--ink-black);
    text-decoration: none;
    background-image: linear-gradient(var(--graphite), var(--graphite));
    background-size: 0% 1px;
    background-position: 0 100%;
    background-repeat: no-repeat;
    transition: background-size 0.25s ease;
    display: inline-block;
}

.contact-link:hover {
    background-size: 100% 1px;
}

/* ============================================================
   Footer Zone
   ============================================================ */

.footer {
    padding: calc(var(--baseline) * 4) 0 calc(var(--baseline) * 6);
    margin-top: calc(var(--baseline) * 8);
}

.footer-rule {
    width: 100%;
    height: 1px;
    background: var(--ink-black);
    margin-bottom: calc(var(--baseline) * 3);
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
}

.footer-copy {
    font-family: var(--font-body);
    font-weight: 500;
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--slate);
}

.footer-nav {
    display: flex;
    gap: calc(var(--gutter) * 2);
}

.footer-link {
    font-family: var(--font-heading);
    font-weight: 500;
    font-size: 0.75rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--slate);
    text-decoration: none;
    background-image: linear-gradient(var(--graphite), var(--graphite));
    background-size: 0% 1px;
    background-position: 0 100%;
    background-repeat: no-repeat;
    transition: background-size 0.25s ease, color 0.2s ease;
}

.footer-link:hover {
    color: var(--ink-black);
    background-size: 100% 1px;
}

/* ============================================================
   Reveal Animation
   ============================================================ */

.reveal-block {
    opacity: 0;
    transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal-block.revealed {
    opacity: 1;
}

/* ============================================================
   Responsive Grid Degradation
   ============================================================ */

/* 768px - 1200px: 8-column grid */
@media (max-width: 1200px) {
    .grid-overlay {
        grid-template-columns: repeat(8, 1fr);
    }

    .grid-column:nth-child(n+9) {
        display: none;
    }

    .grid-column {
        border-right-color: rgba(200, 200, 200, 0.08);
    }

    .grid-column:first-child {
        border-left-color: rgba(200, 200, 200, 0.08);
    }

    .grid-label {
        display: none;
    }

    .grid-column::after {
        display: none;
    }

    .content-grid {
        grid-template-columns: 1fr 1fr;
    }

    .content-grid:nth-child(odd) {
        grid-template-columns: 1fr 1fr;
    }

    .about-grid,
    .contact-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--gutter);
    }

    .about-details,
    .contact-details {
        padding-top: calc(var(--baseline) * 4);
    }
}

/* < 768px: 4-column grid, single column content */
@media (max-width: 768px) {
    .grid-overlay {
        display: none;
    }

    body::after {
        display: none;
    }

    .crosshair {
        display: none;
    }

    .main-content {
        background: var(--bright-white);
        margin: calc(var(--baseline) * 2);
        padding: calc(var(--baseline) * 3);
        max-width: none;
    }

    .entry-screen {
        padding-left: calc(var(--baseline) * 3);
    }

    .header-inner {
        flex-direction: column;
        gap: calc(var(--baseline) * 2);
    }

    .main-nav {
        gap: var(--gutter);
    }

    .content-grid {
        grid-template-columns: 1fr;
    }

    .content-grid:nth-child(odd) {
        grid-template-columns: 1fr;
    }

    .content-grid:nth-child(odd) .content-card--narrow {
        order: 0;
    }

    .about-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }

    .about-details,
    .contact-details {
        padding-top: 0;
    }

    .footer-inner {
        flex-direction: column;
        gap: calc(var(--baseline) * 2);
    }

    .footer-nav {
        gap: var(--gutter);
    }

    .section-heading {
        font-size: clamp(1.4rem, 5vw, 2rem);
    }

    .card-coord {
        display: none;
    }
}

/* ============================================================
   Selection Style
   ============================================================ */

::selection {
    background: var(--ink-black);
    color: var(--paper);
}