:root {
    --bg: #F7F7F5;
    --surface: #EFEFED;
    --rule-light: #D0D0D0;
    --mid: #808080;
    --body: #3D3D3D;
    --display: #1A1A1A;
    --hover-accent: #000000;
    --caption: #AAAAAA;
}

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

html, body {
    background-color: var(--bg);
    color: var(--body);
    font-family: 'Urbanist', sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    overflow-x: hidden;
}

.document {
    width: 100%;
}

.panel {
    min-height: 100vh;
    width: 100%;
    display: flex;
    align-items: flex-start;
    position: relative;
}

.panel-inner {
    max-width: 720px;
    width: 100%;
    margin: 0 auto;
    padding: 0 clamp(20px, 5vw, 48px);
    position: relative;
}

/* Panel transitions (entry animation) */
.panel:not(.panel-1) .panel-inner > *:not(.notch-marker) {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 500ms cubic-bezier(0.33, 1, 0.68, 1),
                transform 500ms cubic-bezier(0.33, 1, 0.68, 1);
}

.panel:not(.panel-1) .notch-marker {
    transform: scale(0);
    transition: transform 300ms cubic-bezier(0.33, 1, 0.68, 1) 200ms;
}

.panel.is-active:not(.panel-1) .panel-inner > *:not(.notch-marker) {
    opacity: 1;
    transform: translateY(0);
}

.panel.is-active:not(.panel-1) .notch-marker {
    transform: scale(1);
}

/* Panel 1 - The Identifier */
.panel-1 {
    align-items: flex-end;
}

.panel-1 .panel-inner {
    padding-bottom: 40vh;
}

.domain-display {
    font-family: 'Urbanist', sans-serif;
    font-weight: 700;
    font-size: clamp(3.5rem, 10vw, 7.5rem);
    line-height: 0.95;
    letter-spacing: -0.035em;
    color: var(--display);
    text-align: left;
}

.metadata-line {
    font-family: 'Urbanist', sans-serif;
    font-weight: 300;
    font-size: 11px;
    line-height: 1.5;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--mid);
    margin-top: 16px;
}

/* Notch marker - section indicator */
.notch-marker {
    display: block;
    width: 0;
    height: 0;
    border-left: 8px solid var(--display);
    border-top: 6px solid transparent;
    border-bottom: 6px solid transparent;
    position: absolute;
    left: clamp(20px, 5vw, 48px);
    top: 80px;
    transform-origin: left center;
}

/* Panel 2 - The Statement */
.panel-2 {
    align-items: flex-start;
}

.panel-2 .panel-inner {
    padding-top: 80px;
    padding-bottom: 80px;
}

.statement-body {
    font-family: 'Urbanist', sans-serif;
    font-weight: 400;
    font-size: clamp(0.95rem, 1.6vw, 1.05rem);
    line-height: 1.9;
    letter-spacing: 0.01em;
    color: var(--body);
    margin-top: 56px;
}

.rule-truncated {
    width: 120px;
    border: none;
    border-top: 1px solid var(--rule-light);
    margin: 48px 0 0 0;
}

/* Panel 3 - The Index */
.panel-3 {
    align-items: center;
}

.panel-3 .panel-inner {
    padding-top: 120px;
    padding-bottom: 80px;
}

.section-label {
    font-family: 'Urbanist', sans-serif;
    font-weight: 300;
    font-size: clamp(0.75rem, 1.2vw, 0.85rem);
    line-height: 1.5;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--mid);
    margin-top: 56px;
    margin-bottom: 48px;
}

.index-list {
    list-style: none;
}

.index-item {
    display: flex;
    align-items: baseline;
    gap: 14px;
    padding: 0;
    margin-bottom: 40px;
    cursor: pointer;
    transform: translateX(0) scaleY(1);
    transform-origin: left center;
    transition:
        transform 400ms cubic-bezier(0.25, 1, 0.5, 1),
        color 400ms cubic-bezier(0.25, 1, 0.5, 1);
    color: var(--body);
}

.index-item:last-child {
    margin-bottom: 0;
}

.bullet-triangle {
    display: inline-block;
    width: 0;
    height: 0;
    border-left: 6px solid var(--mid);
    border-top: 4.5px solid transparent;
    border-bottom: 4.5px solid transparent;
    transform: rotate(0deg);
    transform-origin: 3px center;
    transition:
        transform 250ms ease-out,
        border-left-color 250ms ease-out;
    flex-shrink: 0;
    align-self: center;
}

.item-title {
    font-family: 'Urbanist', sans-serif;
    font-weight: 600;
    font-size: 1.1rem;
    line-height: 1.3;
    letter-spacing: 0em;
    color: inherit;
    transition: color 200ms ease-out;
}

.item-dash {
    font-weight: 300;
    color: var(--mid);
    margin: 0 4px;
}

.item-descriptor {
    font-family: 'Urbanist', sans-serif;
    font-weight: 300;
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--mid);
}

.index-item.is-hover {
    transform: translateX(12px) scaleY(1.02);
    color: var(--display);
    transition:
        transform 300ms cubic-bezier(0.25, 1, 0.5, 1),
        color 200ms cubic-bezier(0.25, 1, 0.5, 1);
}

.index-item.is-hover .item-title {
    color: var(--display);
}

.index-item.is-hover .bullet-triangle {
    transform: rotate(90deg);
    border-left-color: var(--display);
}

/* Panel 4 - The Close */
.panel-4 {
    align-items: flex-start;
}

.panel-4 .panel-inner {
    padding-top: 120px;
    padding-bottom: 60px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.closing-domain {
    font-family: 'Urbanist', sans-serif;
    font-weight: 400;
    font-size: 1.4rem;
    line-height: 1.3;
    letter-spacing: -0.01em;
    color: var(--display);
    margin-top: 56px;
}

.contact-line {
    font-family: 'Urbanist', sans-serif;
    font-weight: 300;
    font-size: 11px;
    line-height: 1.4;
    letter-spacing: 0.06em;
    color: var(--caption);
    margin-top: 12px;
}

.rule-full {
    width: 100%;
    border: none;
    border-top: 1px solid var(--display);
    margin-top: auto;
}

/* Cursor-following triangle (desktop only) */
#cursor-triangle {
    position: fixed;
    top: 0;
    left: 0;
    width: 0;
    height: 0;
    border-left: 4px solid var(--rule-light);
    border-top: 3px solid transparent;
    border-bottom: 3px solid transparent;
    pointer-events: none;
    z-index: 9999;
    opacity: 0;
    transform: translate(-50%, -50%) rotate(0deg);
    transform-origin: center center;
    transition: opacity 300ms ease-out;
    display: none;
}

@media (min-width: 1024px) {
    #cursor-triangle {
        display: block;
    }
}

/* Responsive */
@media (max-width: 600px) {
    .index-item {
        flex-wrap: wrap;
        gap: 8px;
    }
    .item-descriptor {
        flex-basis: 100%;
        margin-left: 18px;
    }
    .notch-marker {
        top: 60px;
    }
    .panel-2 .panel-inner,
    .panel-3 .panel-inner,
    .panel-4 .panel-inner {
        padding-top: 100px;
    }
}