/* ============================================
   perso.news — Isometric Broken-Grid Layout
   Retro-Futuristic Brass and Midnight Palette
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
    --bg-primary: #0f1923;
    --bg-secondary: #1c2a3a;
    --accent-primary: #e8733a;
    --accent-secondary: #c4a265;
    --accent-tertiary: #3aafa9;
    --text-primary: #ede6d6;
    --text-secondary: #a89f8f;
    --surface-highlight: #f5efe0;
    --iso-top: #263546;
    --iso-right: #0a1118;
    --iso-depth: 20px;
    --iso-depth-nav: 10px;
    --iso-depth-hero: 40px;
    --base-spacing: 64px;
    --micro-spacing: 16px;
}

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

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

body {
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: 'Cutive Mono', monospace;
    font-size: clamp(0.875rem, 1.2vw, 1.05rem);
    line-height: 1.85;
    letter-spacing: 0.01em;
    overflow-x: hidden;
    position: relative;
}

/* --- Isometric Grid Background --- */
#iso-grid-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    background-image:
        linear-gradient(60deg, rgba(28, 42, 58, 0.15) 1px, transparent 1px),
        linear-gradient(-60deg, rgba(28, 42, 58, 0.15) 1px, transparent 1px),
        linear-gradient(60deg, rgba(28, 42, 58, 0.15) 1px, transparent 1px);
    background-size: 60px 104px;
    background-position: 0 0, 0 0, 30px 52px;
}

#iso-grid-bg::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle 2px at center, rgba(58, 175, 169, 0.08) 0%, transparent 100%);
    background-size: 60px 104px;
}

/* --- Collage Layer --- */
#collage-layer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
    overflow: hidden;
}

.collage-char {
    position: absolute;
    font-family: 'Jost', sans-serif;
    font-weight: 700;
    font-size: 20vw;
    line-height: 1;
    color: var(--accent-primary);
    opacity: 0.06;
    will-change: transform;
}

.collage-char-1 {
    top: 10%;
    left: -5%;
    transform: rotate(-12deg);
    animation: collage-drift-1 30s linear infinite;
}

.collage-char-2 {
    top: 50%;
    right: -8%;
    color: var(--accent-secondary);
    opacity: 0.08;
    transform: rotate(8deg);
    animation: collage-drift-2 25s linear infinite;
}

.collage-char-3 {
    bottom: 15%;
    left: 30%;
    opacity: 0.05;
    transform: rotate(-5deg);
    animation: collage-drift-3 35s linear infinite;
}

.collage-shape {
    position: absolute;
}

.collage-circle {
    width: 15vw;
    height: 15vw;
    border-radius: 50%;
    border: 2px solid var(--accent-secondary);
    opacity: 0.07;
    top: 25%;
    right: 15%;
    animation: collage-drift-2 40s linear infinite;
}

.collage-triangle {
    width: 0;
    height: 0;
    border-left: 8vw solid transparent;
    border-right: 8vw solid transparent;
    border-bottom: 14vw solid var(--accent-tertiary);
    opacity: 0.05;
    bottom: 30%;
    left: 10%;
    animation: collage-drift-1 28s linear infinite;
}

.collage-line {
    position: absolute;
    background: var(--accent-primary);
    opacity: 0.08;
}

.collage-line-1 {
    width: 1px;
    height: 40vh;
    top: 5%;
    left: 20%;
    transform: rotate(15deg);
    animation: collage-drift-3 22s linear infinite;
}

.collage-line-2 {
    width: 30vw;
    height: 1px;
    top: 60%;
    right: 5%;
    background: var(--accent-secondary);
    opacity: 0.06;
    animation: collage-drift-1 32s linear infinite;
}

.collage-line-3 {
    width: 1px;
    height: 25vh;
    bottom: 10%;
    right: 30%;
    background: var(--accent-tertiary);
    opacity: 0.07;
    transform: rotate(-20deg);
    animation: collage-drift-2 26s linear infinite;
}

@keyframes collage-drift-1 {
    0% { transform: translateY(0); }
    100% { transform: translateY(-80px); }
}

@keyframes collage-drift-2 {
    0% { transform: translateY(0); }
    100% { transform: translateY(-60px); }
}

@keyframes collage-drift-3 {
    0% { transform: translateY(0); }
    100% { transform: translateY(-100px); }
}

/* --- Folio Header --- */
#folio-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--base-spacing);
    padding-left: 100px;
    font-family: 'Jost', sans-serif;
    font-weight: 500;
    font-size: 0.7rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--text-secondary);
    background: rgba(15, 25, 35, 0.9);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid rgba(38, 53, 70, 0.5);
    z-index: 100;
}

#folio-title {
    color: var(--accent-secondary);
}

#folio-section {
    transition: opacity 0.3s ease;
}

/* --- Navigation Sidebar --- */
#iso-nav {
    position: fixed;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 4px;
    z-index: 99;
    padding-left: 8px;
}

.nav-tab {
    position: relative;
    display: flex;
    flex-direction: column;
    padding: 10px 16px;
    background: var(--bg-secondary);
    text-decoration: none;
    color: var(--text-primary);
    font-family: 'Jost', sans-serif;
    font-weight: 500;
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    transition: transform 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94), background 0.3s ease;
    transform-origin: left center;
}

.nav-tab::before {
    content: '';
    position: absolute;
    top: calc(-1 * var(--iso-depth-nav));
    left: 0;
    right: 0;
    height: var(--iso-depth-nav);
    background: var(--iso-top);
    transform: skewX(-45deg);
    transform-origin: bottom left;
    transition: background 0.3s ease;
}

.nav-tab::after {
    content: '';
    position: absolute;
    top: 0;
    right: calc(-1 * var(--iso-depth-nav));
    bottom: 0;
    width: var(--iso-depth-nav);
    background: var(--iso-right);
    transform: skewY(-45deg);
    transform-origin: top left;
    transition: background 0.3s ease;
}

.nav-tab-sub {
    font-family: 'Cutive Mono', monospace;
    font-size: 0.6rem;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
    text-transform: none;
    max-width: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-width 0.4s ease, opacity 0.3s ease, margin-top 0.3s ease;
    margin-top: 0;
    white-space: nowrap;
}

.nav-tab:hover {
    transform: translateX(12px);
    background: var(--accent-primary);
    color: var(--bg-primary);
}

.nav-tab:hover::before {
    background: #c45a28;
}

.nav-tab:hover::after {
    background: #8a4520;
}

.nav-tab:hover .nav-tab-sub {
    max-width: 120px;
    opacity: 1;
    margin-top: 4px;
    color: var(--bg-primary);
}

.nav-tab.active {
    background: var(--accent-primary);
    color: var(--bg-primary);
}

.nav-tab.active::before {
    background: #c45a28;
}

.nav-tab.active::after {
    background: #8a4520;
}

.nav-tab.active .nav-tab-sub {
    max-width: 120px;
    opacity: 1;
    margin-top: 4px;
    color: var(--bg-primary);
}

/* --- Isometric Block Base --- */
.iso-block {
    position: relative;
}

.iso-block::before {
    content: '';
    position: absolute;
    top: calc(-1 * var(--iso-depth));
    left: 0;
    right: 0;
    height: var(--iso-depth);
    background: var(--iso-top);
    transform: skewX(-45deg);
    transform-origin: bottom left;
    pointer-events: none;
}

.iso-block::after {
    content: '';
    position: absolute;
    top: 0;
    right: calc(-1 * var(--iso-depth));
    bottom: 0;
    width: var(--iso-depth);
    background: var(--iso-right);
    transform: skewY(-45deg);
    transform-origin: top left;
    pointer-events: none;
}

/* --- Hero Section --- */
#hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 2;
    padding-top: 40px;
    overflow: hidden;
}

.page-number {
    position: absolute;
    top: 10%;
    right: 8%;
    font-family: 'Jost', sans-serif;
    font-weight: 700;
    font-size: 15vw;
    line-height: 1;
    color: var(--text-primary);
    opacity: 0.04;
    pointer-events: none;
    z-index: 0;
    user-select: none;
}

#hero-tower {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
    animation: tower-breathe 8s ease-in-out infinite alternate;
    position: relative;
    z-index: 1;
}

@keyframes tower-breathe {
    0% { transform: skewX(-0.5deg); }
    100% { transform: skewX(0.5deg); }
}

.tower-block {
    --iso-depth: var(--iso-depth-hero);
    width: clamp(280px, 50vw, 600px);
    background: var(--bg-secondary);
}

.tower-block-top {
    height: 60px;
    background: var(--iso-top);
}

.tower-block-mid {
    padding: clamp(24px, 4vw, 48px) clamp(32px, 5vw, 64px);
    display: flex;
    align-items: center;
    justify-content: center;
}

.tower-block-bottom {
    height: 40px;
    background: rgba(28, 42, 58, 0.6);
}

.tower-block::before {
    height: var(--iso-depth-hero);
    top: calc(-1 * var(--iso-depth-hero));
}

.tower-block::after {
    width: var(--iso-depth-hero);
    right: calc(-1 * var(--iso-depth-hero));
}

#hero-title {
    font-family: 'Jost', sans-serif;
    font-weight: 700;
    font-size: clamp(3rem, 8vw, 7rem);
    letter-spacing: 0.15em;
    color: var(--text-primary);
    text-transform: lowercase;
    white-space: nowrap;
}

#hero-tagline {
    font-family: 'Cutive Mono', monospace;
    font-size: clamp(0.8rem, 1.2vw, 1rem);
    color: var(--text-secondary);
    margin-top: var(--base-spacing);
    letter-spacing: 0.05em;
    z-index: 1;
    position: relative;
}

/* --- Bookshelf Strips --- */
.bookshelf-strip {
    position: relative;
    width: 100%;
    height: 80px;
    overflow: hidden;
    z-index: 2;
    background: linear-gradient(
        to bottom,
        rgba(15, 25, 35, 0) 0%,
        rgba(28, 42, 58, 0.3) 20%,
        rgba(28, 42, 58, 0.3) 80%,
        rgba(15, 25, 35, 0) 100%
    );
}

.bookshelf-svg {
    width: 100%;
    height: 100%;
}

.book-spine {
    opacity: 0;
    transform-origin: bottom center;
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.bookshelf-strip.in-view .book-spine {
    opacity: 1;
    transform: scaleY(1);
}

/* --- Floor Sections --- */
.floor {
    position: relative;
    z-index: 2;
    padding: calc(var(--base-spacing) * 2) var(--base-spacing);
    padding-left: 120px;
    min-height: 80vh;
}

.floor-grid {
    display: grid;
    grid-template-columns: 200px 1fr 1fr;
    gap: var(--base-spacing);
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
}

/* --- Marginalia --- */
.marginalia {
    grid-column: 1;
    grid-row: 1 / -1;
    position: relative;
    padding-right: var(--micro-spacing);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.marginalia-line {
    display: block;
    width: 100%;
    height: 1px;
    background: var(--iso-top);
    margin-bottom: 8px;
}

.marginalia p {
    font-family: 'Cutive Mono', monospace;
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.6;
    max-width: 180px;
}

/* --- Content Blocks --- */
.content-block {
    --iso-depth: 20px;
    background: var(--bg-secondary);
    padding: clamp(24px, 3vw, 40px);
    position: relative;
    transition: transform 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                z-index 0s,
                box-shadow 0.5s ease;
    z-index: 1;
    will-change: transform;
    margin-top: var(--offset-y, 0);
    /* Scroll reveal initial state */
    opacity: 0;
    transform: translateX(80px);
}

.content-block.revealed {
    opacity: 1;
    transform: translateX(0) translate(var(--mag-x, 0px), var(--mag-y, 0px));
}

.content-block:hover {
    z-index: 10;
    box-shadow: 0 20px 60px rgba(15, 25, 35, 0.6);
}

.block-a { grid-column: 2; grid-row: 1; }
.block-b { grid-column: 3; grid-row: 1; }
.block-c { grid-column: 2 / span 2; grid-row: 2; max-width: 70%; }

.block-d { grid-column: 2; grid-row: 1; }
.block-e { grid-column: 2 / span 2; grid-row: 2; }
.block-f { grid-column: 3; grid-row: 1; }

.block-g { grid-column: 3; grid-row: 1; }
.block-h { grid-column: 2; grid-row: 1; }
.block-i { grid-column: 2 / span 2; grid-row: 2; max-width: 65%; }

/* --- Typography --- */
.section-heading {
    font-family: 'Jost', sans-serif;
    font-weight: 700;
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    letter-spacing: 0.08em;
    color: var(--accent-primary);
    margin-bottom: var(--micro-spacing);
    clip-path: inset(0 100% 0 0);
    transition: clip-path 0.6s cubic-bezier(0.77, 0, 0.175, 1);
}

.content-block.revealed .section-heading {
    clip-path: inset(0 0% 0 0);
}

.body-text {
    font-family: 'Cutive Mono', monospace;
    font-size: clamp(0.875rem, 1.2vw, 1.05rem);
    line-height: 1.85;
    letter-spacing: 0.01em;
    color: var(--text-primary);
    max-width: 58ch;
    margin-bottom: var(--micro-spacing);
}

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

.pull-quote {
    font-family: 'Archivo Black', sans-serif;
    font-weight: 400;
    font-size: clamp(1.8rem, 4vw, 3.5rem);
    letter-spacing: -0.02em;
    line-height: 1.05;
    color: var(--accent-secondary);
    border: none;
    padding: 0;
    transform: translateY(30px) rotate(-1deg);
    opacity: 0;
    transition: transform 0.6s cubic-bezier(0.77, 0, 0.175, 1),
                opacity 0.6s ease;
}

.content-block.revealed .pull-quote {
    transform: translateY(0) rotate(0deg);
    opacity: 1;
}

/* --- Colophon --- */
#colophon {
    position: relative;
    z-index: 2;
    padding: calc(var(--base-spacing) * 2) var(--base-spacing);
    padding-left: 120px;
    min-height: 60vh;
    display: flex;
    align-items: center;
}

.colophon-content {
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

.colophon-block {
    --iso-depth: 20px;
    background: var(--bg-secondary);
    padding: clamp(32px, 4vw, 56px);
    max-width: 700px;
    opacity: 0;
    transform: translateX(80px);
    transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.colophon-block.revealed {
    opacity: 1;
    transform: translateX(0);
}

.colophon-meta {
    color: var(--text-secondary);
    font-style: italic;
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--iso-top);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-secondary);
}

/* --- Selection --- */
::selection {
    background: var(--accent-primary);
    color: var(--bg-primary);
}

/* --- Responsive --- */
@media (max-width: 1200px) {
    .marginalia {
        display: none;
    }

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

    .block-a, .block-d, .block-h { grid-column: 1; grid-row: 1; }
    .block-b, .block-f, .block-g { grid-column: 2; grid-row: 1; }
    .block-c, .block-e, .block-i { grid-column: 1 / span 2; grid-row: 2; max-width: 100%; }
}

@media (max-width: 900px) {
    :root {
        --base-spacing: 32px;
    }

    .floor {
        padding-left: 80px;
    }

    #colophon {
        padding-left: 80px;
    }

    .floor-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .block-a, .block-b, .block-c,
    .block-d, .block-e, .block-f,
    .block-g, .block-h, .block-i {
        grid-column: 1;
        grid-row: auto;
        max-width: 100%;
    }

    .content-block {
        margin-top: 0;
    }

    #folio-header {
        padding-left: 80px;
    }

    .nav-tab-text {
        font-size: 0.65rem;
    }
}

@media (max-width: 600px) {
    .floor {
        padding-left: 16px;
        padding-right: 16px;
    }

    #colophon {
        padding-left: 16px;
        padding-right: 16px;
    }

    #iso-nav {
        display: none;
    }

    #folio-header {
        padding-left: 16px;
    }

    .tower-block {
        --iso-depth: 20px;
    }

    .tower-block::before {
        height: 20px;
        top: -20px;
    }

    .tower-block::after {
        width: 20px;
        right: -20px;
    }
}