/* =====================================================
   kaguya.stream — Complete Styles
   Design: anti-design, sidebar layout, frutiger-clean typography
   Palette: triadic bioluminescent moss / circuit copper / indigo void
   ===================================================== */

/* === Google Fonts === */
@import url('https://fonts.googleapis.com/css2?family=Nunito+Sans:wght@300;600&family=Space+Mono:wght@400&display=swap');

/* === CSS Custom Properties === */
:root {
    --indigo-void: #1B1F3A;
    --deep-indigo: #2C3154;
    --bio-moss: #4A7C59;
    --light-moss: #6B9E7A;
    --circuit-copper: #B87333;
    --washi-paper: #E8E4DA;
    --warm-copper-light: #D4A853;

    --sidebar-width: 260px;
    --sidebar-width-mobile: 48px;

    --font-primary: 'Nunito Sans', 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'Space Mono', 'Courier New', monospace;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--indigo-void);
    color: var(--washi-paper);
    font-family: var(--font-primary);
    font-weight: 300;
    font-size: 19px;
    line-height: 1.85;
    overflow-x: hidden;
    display: flex;
}

/* === Sidebar === */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background-color: var(--deep-indigo);
    border-right: 1px solid rgba(184, 115, 51, 0.3);
    z-index: 100;
    display: flex;
    flex-direction: column;
    align-items: center;
    overflow: hidden;
    transition: transform 0.35s ease;
}

/* Moon phase dot */
.moon-dot {
    width: 8px;
    height: 8px;
    background-color: var(--washi-paper);
    border-radius: 50%;
    position: absolute;
    top: 40px;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0.85;
    flex-shrink: 0;
}

/* Moon dot variants via data-phase attribute */
.moon-dot[data-phase="new"] {
    border-radius: 0%;
    background-color: transparent;
    border: 1px solid rgba(232, 228, 218, 0.5);
}

.moon-dot[data-phase="crescent"] {
    border-radius: 50% 50% 50% 0%;
}

/* Vertical domain wordmark */
.sidebar-wordmark {
    font-family: var(--font-primary);
    font-weight: 600;
    font-size: 11px;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--warm-copper-light);
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    position: absolute;
    top: 24px;
    left: 50%;
    transform: translateX(-50%) rotate(180deg);
    white-space: nowrap;
}

/* Golden ratio horizontal rule — at 61.8% from top */
.sidebar-rule {
    position: absolute;
    top: 61.8%;
    left: 16px;
    right: 16px;
    height: 1px;
    background-color: var(--circuit-copper);
    opacity: 0.5;
}

/* Navigation — below the golden rule with irregular spacing */
.sidebar-nav {
    position: absolute;
    top: calc(61.8% + 20px);
    left: 0;
    right: 0;
    display: flex;
    flex-direction: column;
    padding: 0 20px;
}

.nav-item {
    font-family: var(--font-primary);
    font-weight: 300;
    font-size: 10px;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: rgba(232, 228, 218, 0.7);
    text-decoration: none;
    display: block;
    position: relative;
    transition: color 0.2s ease;
    overflow: hidden;
}

/* Irregular margin-top values — bamboo grove irregularity */
.nav-item:nth-child(1) { margin-top: 0; }
.nav-item:nth-child(2) { margin-top: 16px; }
.nav-item:nth-child(3) { margin-top: 8px; }
.nav-item:nth-child(4) { margin-top: 24px; }
.nav-item:nth-child(5) { margin-top: 10px; }

/* Copper underline on hover — width 0→100%, 200ms ease-out */
.nav-item::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--circuit-copper);
    transition: width 0.2s ease-out;
}

.nav-item:hover {
    color: var(--washi-paper);
}

.nav-item:hover::after {
    width: 100%;
}

.nav-item.active {
    color: var(--warm-copper-light);
}

/* Circuit trace at sidebar bottom */
.sidebar-circuit {
    position: absolute;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0.7;
}

/* Mobile sidebar toggle — hidden on desktop */
.sidebar-toggle {
    display: none;
    position: absolute;
    top: 50%;
    right: 8px;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

/* === Main Content === */
.main-content {
    margin-left: var(--sidebar-width);
    width: calc(100vw - var(--sidebar-width));
    min-height: 100vh;
}

/* === Panel Base === */
.panel {
    position: relative;
    width: 100%;
    height: 100vh;
    overflow: hidden;
    display: flex;
    align-items: stretch;
}

.panel-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    transform-origin: center center;
    transition: transform 0.6s ease-out;
}

.panel-inner {
    position: relative;
    z-index: 1;
    width: 100%;
    display: flex;
}

/* === Panel 1: The Bamboo Discovery === */
.panel-1 {
    background-color: var(--indigo-void);
}

.panel-1-bg {
    background-color: var(--indigo-void);
}

.panel-1 .panel-inner {
    justify-content: center;
    align-items: center;
}

.panel-1-center {
    text-align: center;
    transform: scale(0.96);
    opacity: 0;
    transition: transform 0.6s ease-out, opacity 0.6s ease-out;
}

.panel-1-center.entered {
    transform: scale(1);
    opacity: 1;
}

/* Main domain wordmark on panel 1 */
.domain-wordmark-main {
    font-family: var(--font-primary);
    font-weight: 600;
    font-size: 13px;
    letter-spacing: 0.4em;
    text-transform: uppercase;
    color: var(--washi-paper);
}

/* Subtitle — only one on the page */
.subtitle-line {
    margin-top: 3em;
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 10px;
    letter-spacing: 0.2em;
    color: rgba(232, 228, 218, 0.55);
}

/* === Panel 2: The Circuit Grove === */
.panel-2 {
    background-color: var(--indigo-void);
}

.panel-2-bg {
    background-color: var(--indigo-void);
}

.circuit-overlay {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

.panel-2 .panel-inner {
    align-items: flex-start;
    padding-top: 25vh;
}

.panel-2-inner {
    padding-left: calc(2 / 7 * 100%);
    padding-right: calc(1 / 7 * 100%);
}

.panel-2-content {
    transform: scale(0.96);
    opacity: 0;
    transition: transform 0.6s ease-out, opacity 0.5s ease-out;
}

.panel-2-content.entered {
    transform: scale(1);
    opacity: 1;
}

/* === Panel 3: The Moss Light === */
.panel-3 {
    background-color: var(--deep-indigo);
}

.panel-3-bg {
    background-color: var(--deep-indigo);
}

/* Bioluminescent bloom pool */
.panel-3-bloom {
    position: absolute;
    width: 500px;
    height: 500px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(107, 158, 122, 0.12) 0%, transparent 70%);
    top: 30%;
    right: 15%;
    z-index: 0;
    pointer-events: none;
}

.panel-3 .panel-inner {
    align-items: flex-end;
    padding-bottom: 12vh;
}

.panel-3-inner {
    padding-left: calc(2 / 7 * 100%);
    padding-right: calc(1 / 7 * 100%);
}

.panel-3-content {
    text-align: right;
    width: 100%;
    transform: scale(0.96);
    opacity: 0;
    transition: transform 0.6s ease-out, opacity 0.5s ease-out;
}

.panel-3-content.entered {
    transform: scale(1);
    opacity: 1;
}

/* === Panel 4: The Via === */
.panel-4 {
    background-color: var(--indigo-void);
}

.panel-4-bg {
    background-color: var(--indigo-void);
}

.panel-4 .panel-inner {
    flex-direction: column;
    justify-content: center;
    padding: 0 calc(1 / 7 * 100%);
}

.panel-4-inner {
    padding-left: calc(1 / 7 * 100%);
    padding-right: calc(1 / 7 * 100%);
}

.panel-4-upper {
    width: calc(5 / 7 * 100%);
    margin-left: calc(1 / 7 * 100%);
    margin-bottom: 3vh;
    transform: scale(0.96);
    opacity: 0;
    transition: transform 0.6s ease-out, opacity 0.5s ease-out;
}

.panel-4-upper.entered {
    transform: scale(1);
    opacity: 1;
}

/* Via SVG full-width divider */
.via-divider {
    width: 100%;
    padding: 0 calc(1 / 7 * 100%);
    margin: 2vh 0;
}

.via-svg {
    display: block;
    width: 100%;
    height: 8px;
}

.panel-4-lower {
    width: calc(5 / 7 * 100%);
    margin-left: calc(2 / 7 * 100%);
    margin-top: 3vh;
    transform: scale(0.96);
    opacity: 0;
    transition: transform 0.6s ease-out, opacity 0.5s ease-out 0.1s;
}

.panel-4-lower.entered {
    transform: scale(1);
    opacity: 1;
}

/* === Panel 5: The Return === */
.panel-5 {
    background-color: var(--deep-indigo);
}

.panel-5-bg {
    background-color: var(--deep-indigo);
}

.panel-5 .panel-inner {
    flex-direction: column;
    justify-content: space-between;
    padding-top: 8vh;
    padding-bottom: 10vh;
}

.panel-5-inner {
    padding-left: calc(1 / 7 * 100%);
    padding-right: calc(2 / 7 * 100%);
}

/* Bamboo node divider */
.bamboo-divider {
    width: calc(6 / 7 * 100%);
    margin-bottom: auto;
}

.bamboo-svg {
    display: block;
    width: 100%;
    height: 16px;
}

/* Final content — sparse, bottom-aligned, left margin column 2 */
.panel-5-content {
    padding-left: calc(1 / 7 * 100%);
    width: calc(5 / 7 * 100%);
    transform: scale(0.96);
    opacity: 0;
    transition: transform 0.6s ease-out, opacity 0.5s ease-out;
}

.panel-5-content.entered {
    transform: scale(1);
    opacity: 1;
}

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

/* Section headings — anti-design: smaller than body (13px vs 19px body) */
.section-heading {
    font-family: var(--font-primary);
    font-weight: 300;
    font-size: 13px;
    line-height: 1.4;
    letter-spacing: 0.4em;
    text-transform: uppercase;
    color: rgba(232, 228, 218, 0.5);
    margin-bottom: 2em;
    display: block;
}

/* Body text — oversized, text-as-landscape */
.body-text {
    font-family: var(--font-primary);
    font-weight: 300;
    font-size: 19px;
    line-height: 1.85;
    color: var(--washi-paper);
    margin-bottom: 1.6em;
}

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

/* Mono annotations — technical-looking inline metadata */
.mono-annotation {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.1em;
    color: rgba(184, 115, 51, 0.7);
    white-space: nowrap;
    margin: 0 0.5em;
    vertical-align: middle;
}

/* === Background counter-zoom animation === */
/* Applied via JS on panel backgrounds during zoom-focus entrance */
.panel-bg.zoom-entering {
    transform: scale(1.04);
}

.panel-bg.zoom-entered {
    transform: scale(1.0);
    transition: transform 0.6s ease-out;
}

/* === Mobile Styles === */
@media (max-width: 768px) {
    .sidebar {
        width: var(--sidebar-width-mobile);
        overflow: visible;
    }

    .sidebar.expanded {
        width: var(--sidebar-width);
        background-color: rgba(44, 49, 84, 0.96);
    }

    .sidebar-wordmark {
        font-size: 9px;
        letter-spacing: 0.15em;
    }

    .sidebar-rule {
        display: none;
    }

    .sidebar-nav {
        display: none;
    }

    .sidebar.expanded .sidebar-nav {
        display: flex;
    }

    .sidebar.expanded .sidebar-rule {
        display: block;
    }

    .sidebar-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .main-content {
        margin-left: var(--sidebar-width-mobile);
        width: calc(100vw - var(--sidebar-width-mobile));
    }

    .panel-2-inner,
    .panel-3-inner,
    .panel-4-inner,
    .panel-5-inner {
        padding-left: 24px;
        padding-right: 24px;
    }

    .panel-4-upper,
    .panel-4-lower {
        width: 100%;
        margin-left: 0;
    }

    .panel-5-content {
        width: 100%;
        padding-left: 0;
    }

    .bamboo-divider {
        width: 100%;
    }
}