/* ============================================
   SSETTL.com - Design System
   Palette: Warm-earthy (terracotta, walnut, linen)
   Layout: F-pattern reading flow
   Motifs: Sharp angles, measurement notation
   ============================================ */

:root {
    /* Palette */
    --kiln-white: #FAF6F0;
    --raw-clay: #F0E4D4;
    --charred-walnut: #2C1E12;
    --aged-bark: #5C4A3A;
    --burnt-sienna: #A0522D;
    --iron-sand: #8B6914;
    --desert-clay: #C4A882;
    --kiln-black: #1A0E06;

    /* Spacing (8px baseline x golden ratio) */
    --space-1: 8px;
    --space-2: 13px;
    --space-3: 21px;
    --space-4: 34px;
    --space-5: 55px;
    --space-6: 89px;

    /* Typography */
    --font-heading: 'Josefin Sans', sans-serif;
    --font-body: 'Nunito Sans', sans-serif;
    --font-mono: 'DM Mono', monospace;

    /* Gutter */
    --gutter-width: 80px;
}

/* ============================================
   Reset & Base
   ============================================ */

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    border-radius: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--charred-walnut);
    background-color: var(--kiln-white);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   Typography
   ============================================ */

h1 {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    letter-spacing: 0.04em;
    line-height: 1.15;
    color: var(--charred-walnut);
}

h2 {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: clamp(1.75rem, 3.5vw, 3rem);
    letter-spacing: 0.04em;
    line-height: 1.2;
    color: var(--charred-walnut);
    margin-bottom: var(--space-4);
}

h3 {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: clamp(1.1rem, 2vw, 1.5rem);
    letter-spacing: 0.03em;
    line-height: 1.3;
    color: var(--charred-walnut);
    margin-bottom: var(--space-2);
}

p {
    margin-bottom: var(--space-3);
    color: var(--aged-bark);
}

/* ============================================
   Left Gutter - Measurement Notation
   ============================================ */

.gutter {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--gutter-width);
    height: 100vh;
    z-index: 100;
    pointer-events: none;
}

.tick-group {
    position: absolute;
    left: 0;
    width: 100%;
}

.tick {
    position: absolute;
    top: var(--top);
    left: 30px;
    display: block;
    width: 2px;
    height: 16px;
    background-color: var(--iron-sand);
    transform: rotate(var(--rotation));
    transform-origin: center center;
}

.tick-label {
    position: absolute;
    top: var(--top);
    left: 48px;
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    color: var(--iron-sand);
    line-height: 1;
}

/* ============================================
   Section Base
   ============================================ */

.section {
    position: relative;
    width: 100%;
    padding-left: var(--gutter-width);
}

/* Angled clip-path section transitions (4-degree shear) */
.section-narrative,
.section-evidence,
.section-approach,
.section-method {
    clip-path: polygon(0 0, 100% 2%, 100% 100%, 0 98%);
}

/* ============================================
   Section 1: Top Band
   ============================================ */

.section-top {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    background-color: var(--kiln-white);
    padding-top: var(--space-5);
    padding-right: var(--space-5);
}

.top-band {
    position: relative;
    width: 100%;
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding-left: var(--space-4);
}

.wordmark {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: clamp(1.5rem, 2.5vw, 2.2rem);
    letter-spacing: 0.08em;
    color: var(--charred-walnut);
    cursor: pointer;
    transition: transform 200ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
    flex-shrink: 0;
    text-transform: uppercase;
}

.wordmark:hover {
    transform: scale(1.03);
}

.horizon-rule {
    height: 1px;
    width: 70%;
    background-color: var(--burnt-sienna);
    flex-shrink: 1;
}

.triangle-accent {
    width: 0;
    height: 0;
    border-left: 20px solid transparent;
    border-right: 20px solid transparent;
    border-bottom: 28px solid var(--burnt-sienna);
    flex-shrink: 0;
    clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
}

.statement {
    padding-left: var(--space-4);
    padding-top: var(--space-6);
    max-width: 680px;
    opacity: 0;
}

.statement.visible {
    opacity: 1;
    transition: opacity 150ms linear;
}

.statement h1 {
    color: var(--charred-walnut);
}

/* ============================================
   Section 2: Secondary Scan Row - Narrative
   ============================================ */

.section-narrative {
    position: relative;
    min-height: 70vh;
    background-color: var(--kiln-white);
    padding-top: var(--space-6);
    padding-bottom: var(--space-6);
    padding-right: var(--space-5);
}

.narrative-content {
    max-width: 680px;
    padding-left: var(--space-4);
}

.narrative-content h2 {
    cursor: pointer;
    transition: transform 200ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
    display: inline-block;
}

.narrative-content h2:hover {
    transform: scale(1.03);
}

.diagonal-accent {
    position: absolute;
    right: 0;
    top: 30%;
    width: 40%;
    height: 60%;
    z-index: 1;
    overflow: visible;
}

.diagonal-accent line {
    stroke-dasharray: 500;
    stroke-dashoffset: 500;
}

.diagonal-accent.animated line {
    animation: drawLine 1.2s ease-out 0.5s forwards;
}

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

/* ============================================
   Section 3: Evidence Band
   ============================================ */

.section-evidence {
    background-color: var(--raw-clay);
    padding-top: calc(var(--space-6) + 20px);
    padding-bottom: var(--space-6);
    padding-right: var(--space-5);
}

.evidence-content {
    padding-left: var(--space-4);
    max-width: 780px;
}

.evidence-content h2 {
    cursor: pointer;
    transition: transform 200ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
    display: inline-block;
}

.evidence-content h2:hover {
    transform: scale(1.03);
}

.evidence-block {
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
}

.evidence-item {
    position: relative;
    padding-left: var(--space-5);
}

/* Chevron Icons */
.chevron-icon {
    position: absolute;
    left: 0;
    top: 4px;
    width: 24px;
    height: 24px;
    cursor: pointer;
    transition: transform 200ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.chevron-icon:hover {
    transform: scale(1.03);
}

.chevron-stroke {
    position: absolute;
    width: 12px;
    height: 1px;
    background-color: var(--burnt-sienna);
    top: 50%;
    left: 50%;
    transform-origin: left center;
}

.chevron-stroke-1 {
    transform: translate(-6px, -1px) rotate(45deg);
}

.chevron-stroke-2 {
    transform: translate(-6px, 1px) rotate(-45deg);
}

/* Expanded state */
.chevron-icon[data-state="expanded"] {
    transform: rotate(90deg);
}

.chevron-icon[data-state="expanded"]:hover {
    transform: rotate(90deg) scale(1.03);
}

.evidence-item p {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 300ms ease, opacity 200ms ease;
    margin-bottom: 0;
}

.evidence-item.expanded p {
    max-height: 300px;
    opacity: 1;
    margin-bottom: var(--space-3);
}

/* ============================================
   Section 4: Approach Band
   ============================================ */

.section-approach {
    background-color: var(--kiln-white);
    padding-top: calc(var(--space-6) + 20px);
    padding-bottom: var(--space-6);
    padding-right: var(--space-5);
}

.approach-content {
    max-width: 680px;
    padding-left: var(--space-4);
}

.approach-content h2 {
    cursor: pointer;
    transition: transform 200ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
    display: inline-block;
}

.approach-content h2:hover {
    transform: scale(1.03);
}

.approach-accent {
    margin-top: var(--space-4);
    width: 300px;
    height: 60px;
}

.approach-line {
    width: 100%;
    height: 100%;
}

/* ============================================
   Section 5: Methodology Band
   ============================================ */

.section-method {
    background-color: var(--raw-clay);
    padding-top: calc(var(--space-6) + 20px);
    padding-bottom: var(--space-6);
    padding-right: var(--space-5);
}

.method-content {
    padding-left: var(--space-4);
    max-width: 900px;
}

.method-content h2 {
    cursor: pointer;
    transition: transform 200ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
    display: inline-block;
}

.method-content h2:hover {
    transform: scale(1.03);
}

.method-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-5) var(--space-5);
}

.method-item {
    position: relative;
    padding-left: var(--space-4);
}

.method-number {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    color: var(--iron-sand);
    display: block;
    margin-bottom: var(--space-1);
}

/* ============================================
   Section 6: Concluded State
   ============================================ */

.section-concluded {
    background-color: var(--kiln-black);
    padding-top: var(--space-6);
    padding-bottom: var(--space-6);
    min-height: 50vh;
    display: flex;
    align-items: center;
    clip-path: polygon(0 0, 100% 2%, 100% 100%, 0 100%);
}

.concluded-content {
    padding-left: var(--space-4);
    max-width: 680px;
}

.concluded-wordmark {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: clamp(1.5rem, 2.5vw, 2.2rem);
    letter-spacing: 0.08em;
    color: var(--kiln-white);
    text-transform: uppercase;
    margin-bottom: var(--space-3);
}

.concluded-rule {
    width: 120px;
    height: 1px;
    background-color: var(--burnt-sienna);
    margin-bottom: var(--space-4);
}

.concluded-statement {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
    letter-spacing: 0.04em;
    color: var(--raw-clay);
    margin-bottom: var(--space-4);
}

.concluded-meta {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.meta-label {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    color: var(--aged-bark);
}

.meta-separator {
    width: 30px;
    height: 1px;
    background-color: var(--aged-bark);
    transform: rotate(22deg);
}

/* ============================================
   Scale-Hover: Universal interaction pattern
   ============================================ */

.nav-link,
.section h2 {
    cursor: pointer;
}

/* Active state for touch devices */
@media (hover: none) {
    .wordmark:active,
    .narrative-content h2:active,
    .evidence-content h2:active,
    .approach-content h2:active,
    .method-content h2:active,
    .chevron-icon:active {
        transform: scale(1.03);
    }
}

/* ============================================
   Responsive: Mobile (< 768px)
   ============================================ */

@media (max-width: 767px) {
    :root {
        --gutter-width: 40px;
    }

    .gutter {
        width: 40px;
    }

    .tick {
        left: 12px;
        height: 10px;
    }

    .tick-label {
        left: 26px;
        font-size: 0.625rem;
    }

    /* Reduce clip-path angle on mobile */
    .section-narrative,
    .section-evidence,
    .section-approach,
    .section-method {
        clip-path: polygon(0 0, 100% 1%, 100% 100%, 0 99%);
    }

    .section-concluded {
        clip-path: polygon(0 0, 100% 1%, 100% 100%, 0 100%);
    }

    .section-top {
        padding-top: var(--space-4);
        padding-right: var(--space-3);
    }

    .top-band {
        padding-left: var(--space-2);
        flex-wrap: wrap;
    }

    .horizon-rule {
        width: 60%;
    }

    .statement {
        padding-left: var(--space-2);
        padding-top: var(--space-5);
    }

    .narrative-content,
    .evidence-content,
    .approach-content,
    .method-content,
    .concluded-content {
        padding-left: var(--space-2);
    }

    .section-narrative,
    .section-evidence,
    .section-approach,
    .section-method {
        padding-right: var(--space-3);
    }

    .diagonal-accent {
        width: 30%;
        height: 40%;
        top: 40%;
    }

    .method-grid {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }

    .approach-accent {
        width: 200px;
        height: 40px;
    }

    .concluded-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-2);
    }

    .meta-separator {
        display: none;
    }
}

/* ============================================
   Responsive: Tablet (768px - 1024px)
   ============================================ */

@media (min-width: 768px) and (max-width: 1024px) {
    :root {
        --gutter-width: 60px;
    }

    .gutter {
        width: 60px;
    }

    .tick {
        left: 20px;
    }

    .tick-label {
        left: 36px;
    }
}