/* ============================================
   economics.day — Japanese-Minimal Economics
   Design: layered-depth, cool-grays, sci-fi-hud
   ============================================ */

/* --- Custom Properties --- */
:root {
    /* Palette */
    --sumiiro: #2B3038;
    --nezumiiro: #3D4550;
    --ginnezu: #6B7A8A;
    --shironeri: #E8ECF0;
    --hai: #9AACBA;
    --akebono: #D4896A;
    --asagi: #5B9EAD;
    --usuai: #4A5A6A;

    /* Depth layers */
    --layer-0-z: 0;
    --layer-1-z: 10px;
    --layer-2-z: 20px;
    --layer-3-z: 30px;
    --layer-4-z: 40px;

    /* Animation */
    --elastic-bezier: cubic-bezier(0.68, -0.55, 0.27, 1.55);

    /* Typography */
    --font-primary: 'Space Grotesk', sans-serif;
    --font-jp: 'Noto Sans JP', sans-serif;
    --font-mono: 'IBM Plex Mono', monospace;
}

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

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

body {
    background-color: var(--sumiiro);
    color: var(--shironeri);
    font-family: var(--font-primary);
    font-weight: 400;
    font-size: clamp(1rem, 1.2vw, 1.15rem);
    letter-spacing: 0.01em;
    line-height: 1.72;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.svg-defs {
    position: absolute;
    width: 0;
    height: 0;
    overflow: hidden;
}

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

.asanoha-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.02;
    transition: opacity 1.5s ease;
}

.grid-lines {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(to right, rgba(160, 176, 192, 0.03) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(160, 176, 192, 0.03) 1px, transparent 1px);
    background-size: 80px 80px;
}

/* --- Layer 3: HUD Overlay --- */
#hud-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 100;
    pointer-events: none;
    mix-blend-mode: screen;
}

/* Radial navigation indicator */
#nav-indicator {
    position: fixed;
    top: 32px;
    left: 32px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--usuai);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    pointer-events: all;
    z-index: 200;
    transition: background 0.3s ease;
}

#nav-indicator:hover {
    background: var(--ginnezu);
}

#nav-indicator .nav-kanji {
    font-family: var(--font-jp);
    font-size: 10px;
    font-weight: 500;
    color: var(--shironeri);
    line-height: 1;
    user-select: none;
}

.pulse-ring {
    position: absolute;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 1px solid var(--hai);
    animation: pulse-expand 4s ease-out infinite;
    pointer-events: none;
}

@keyframes pulse-expand {
    0% {
        transform: scale(1);
        opacity: 0.6;
    }
    100% {
        transform: scale(1.33);
        opacity: 0;
    }
}

/* Radial menu */
#radial-menu {
    position: absolute;
    top: -8px;
    left: -8px;
    width: 200px;
    height: 120px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

#nav-indicator.menu-open #radial-menu {
    opacity: 1;
    visibility: visible;
}

.radial-item {
    position: absolute;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--nezumiiro);
    border: 1px solid var(--usuai);
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: transform 0.5s var(--elastic-bezier), background 0.3s ease;
    pointer-events: all;
}

.radial-item .radial-icon {
    display: none;
}

.radial-item span {
    font-family: var(--font-jp);
    font-size: 12px;
    font-weight: 500;
    color: var(--shironeri);
}

.radial-item:hover {
    background: var(--ginnezu);
    transform: scale(1.15);
}

.radial-item.active {
    border-color: var(--akebono);
}

.radial-item[data-index="0"] { top: 0; left: 44px; }
.radial-item[data-index="1"] { top: 24px; left: 88px; }
.radial-item[data-index="2"] { top: 60px; left: 112px; }
.radial-item[data-index="3"] { top: 92px; left: 100px; }
.radial-item[data-index="4"] { top: 108px; left: 60px; }

/* Data ticks */
#data-ticks {
    position: fixed;
    top: 0;
    right: 24px;
    width: 16px;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 40px 0;
}

.data-tick {
    height: 1px;
    background: #7A8FA3;
    width: 8px;
    margin-left: auto;
    opacity: 0;
    transition: opacity 0.6s ease;
}

.data-tick.visible {
    opacity: 0.6;
}

.data-tick.major {
    width: 12px;
}

.data-tick .tick-label {
    position: absolute;
    right: 20px;
    font-family: var(--font-mono);
    font-size: 8px;
    color: #7A8FA3;
    letter-spacing: 0.04em;
    white-space: nowrap;
    transform: translateY(-50%);
}

/* Progress bar */
#progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    z-index: 150;
    pointer-events: none;
}

#progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--asagi), var(--akebono));
    transition: width 0.15s linear;
}

/* --- Viewport Wrapper --- */
#viewport-wrapper {
    position: relative;
    z-index: 10;
    perspective: 1200px;
    transform-style: preserve-3d;
}

/* --- Chapter Sections --- */
.chapter {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    padding: 80px;
    overflow: hidden;
    transition: opacity 0.8s ease;
}

.section-content {
    position: relative;
    max-width: 70%;
    padding-left: 8%;
    z-index: 10;
}

/* --- Scan Line --- */
.scan-line {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, var(--asagi) 50%, transparent 100%);
    transform: translateY(-100%);
    opacity: 0;
    z-index: 20;
    pointer-events: none;
}

.scan-line.active {
    animation: scan-sweep 200ms linear forwards;
}

@keyframes scan-sweep {
    0% {
        transform: translateY(-1vh);
        opacity: 0.8;
    }
    100% {
        transform: translateY(100vh);
        opacity: 0;
    }
}

/* --- HUD Brackets --- */
.hud-brackets {
    position: absolute;
    top: -20px;
    left: 4%;
    right: 8%;
    bottom: -20px;
    pointer-events: none;
    opacity: 0;
    transform: scale(0.8);
    transition: opacity 0.5s var(--elastic-bezier), transform 0.5s var(--elastic-bezier);
}

.hud-brackets.visible {
    opacity: 1;
    transform: scale(1);
}

.bracket-tl,
.bracket-br {
    position: absolute;
    width: 16px;
    height: 16px;
}

.bracket-tl {
    top: 0;
    left: 0;
    border-top: 2px solid var(--usuai);
    border-left: 2px solid var(--usuai);
}

.bracket-br {
    bottom: 0;
    right: 0;
    border-bottom: 2px solid var(--usuai);
    border-right: 2px solid var(--usuai);
}

/* Fading brackets for outlook section */
.fading-brackets .bracket-tl,
.fading-brackets .bracket-br {
    border-color: rgba(74, 90, 106, 0.3);
}

/* --- Typography --- */
.section-title {
    display: flex;
    align-items: baseline;
    gap: 20px;
    margin-bottom: 24px;
    opacity: 0;
    transform: translateX(-20px);
    transition: opacity 0.8s var(--elastic-bezier), transform 0.8s var(--elastic-bezier);
    transition-delay: 200ms;
}

.section-title.visible {
    opacity: 1;
    transform: translateX(0);
}

.kanji-marker {
    font-family: var(--font-jp);
    font-size: clamp(1.6rem, 3vw, 2.8rem);
    font-weight: 300;
    color: var(--hai);
    line-height: 1;
}

.title-text {
    font-family: var(--font-primary);
    font-size: clamp(2.4rem, 5vw, 4.8rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.08;
    color: var(--shironeri);
}

.title-text .letter {
    display: inline-block;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.title-text .letter.visible {
    opacity: 1;
    transform: translateY(0);
}

.section-thesis {
    font-family: var(--font-primary);
    font-weight: 300;
    font-size: clamp(1rem, 1.4vw, 1.25rem);
    line-height: 1.8;
    color: var(--hai);
    max-width: 560px;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.7s ease 0.4s, transform 0.7s ease 0.4s;
}

.section-thesis.visible {
    opacity: 1;
    transform: translateY(0);
}

.mono-text {
    font-family: var(--font-mono);
    font-weight: 400;
    letter-spacing: 0.04em;
}

.hud-annotation {
    font-size: clamp(0.7rem, 0.8vw, 0.82rem);
    font-weight: 300;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--hai);
    opacity: 0;
    margin-top: 48px;
    transition: opacity 0.6s ease 0.6s;
}

.hud-annotation.visible {
    opacity: 0.5;
}

/* --- Hero Icon (Section 1) --- */
.hero-icon {
    width: 96px;
    height: 96px;
    margin-bottom: 40px;
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s var(--elastic-bezier), transform 0.7s var(--elastic-bezier);
}

.hero-icon.visible {
    opacity: 1;
    transform: translateY(0) translateX(0);
}

.icon-demand {
    width: 96px;
    height: 96px;
}

/* --- Pinned Icon (Section 2) --- */
.pinned-icon {
    position: absolute;
    left: 2%;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 48px;
    opacity: 0;
    transition: opacity 0.7s var(--elastic-bezier);
}

.pinned-icon.visible {
    opacity: 0.4;
}

/* --- Diamond Constellation (Section 2) --- */
.diamond-constellation {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    max-width: 640px;
    margin-top: 40px;
    transform: rotate(-2deg);
}

/* --- Icon Cards --- */
.icon-card {
    background: rgba(61, 69, 80, 0.5);
    border: 1px solid rgba(160, 176, 192, 0.2);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 4px;
    padding: 28px;
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s var(--elastic-bezier), transform 0.7s var(--elastic-bezier), box-shadow 0.3s ease;
    position: relative;
}

.icon-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.icon-card:hover {
    box-shadow: 0 8px 32px rgba(40, 50, 65, 0.25);
    border-color: rgba(212, 137, 106, 0.3);
}

.card-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 16px;
    display: block;
}

.card-label {
    display: block;
    font-family: var(--font-primary);
    font-weight: 700;
    font-size: 0.95rem;
    letter-spacing: -0.01em;
    color: var(--shironeri);
    margin-bottom: 8px;
}

.card-desc {
    font-family: var(--font-primary);
    font-weight: 300;
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--hai);
}

/* Diamond layout offsets */
.diamond-constellation .icon-card:nth-child(2) {
    transform: translateY(60px);
}

.diamond-constellation .icon-card:nth-child(2).visible {
    transform: translateY(20px);
}

.diamond-constellation .icon-card:nth-child(3) {
    transform: translateY(-20px);
}

.diamond-constellation .icon-card:nth-child(3).visible {
    transform: translateY(-20px);
}

.diamond-constellation .icon-card:nth-child(4) {
    transform: translateY(40px);
}

.diamond-constellation .icon-card:nth-child(4).visible {
    transform: translateY(0);
}

/* --- Equilibrium Section --- */
#section-equilibrium {
    background: var(--nezumiiro);
}

#section-equilibrium .asanoha-boost {
    opacity: 0.04;
}

.merge-icon {
    width: 96px;
    height: 96px;
    margin-bottom: 32px;
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s var(--elastic-bezier), transform 0.7s var(--elastic-bezier);
}

.merge-icon.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Vertical poem */
.vertical-poem {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin: 48px 0;
}

.poem-word {
    font-family: var(--font-primary);
    font-size: clamp(2rem, 4vw, 3.6rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.15;
    color: var(--shironeri);
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.6s var(--elastic-bezier), transform 0.6s var(--elastic-bezier);
}

.poem-word.visible {
    opacity: 1;
    transform: translateX(0);
}

/* --- Movement Section --- */
#section-movement {
    background: transparent;
}

.movement-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 28px;
    max-width: 680px;
    margin-top: 40px;
}

.bounce-card {
    transition: opacity 0.7s var(--elastic-bezier), transform 0.7s var(--elastic-bezier);
}

/* --- Outlook Section --- */
#section-outlook {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.outlook-content {
    text-align: center;
    padding-left: 0;
    max-width: 600px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.outlook-icon {
    width: 128px;
    height: 128px;
    margin-bottom: 48px;
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.9s var(--elastic-bezier), transform 0.9s var(--elastic-bezier);
}

.outlook-icon.visible {
    opacity: 1;
    transform: translateY(0);
}

.icon-bonsai {
    width: 128px;
    height: 128px;
}

#section-outlook .section-title {
    justify-content: center;
}

.outlook-thesis {
    max-width: 520px;
    text-align: center;
    font-size: clamp(1rem, 1.2vw, 1.15rem);
}

.closing-mark {
    margin-top: 64px;
    font-size: 0.82rem;
    letter-spacing: 0.15em;
    text-transform: lowercase;
    color: var(--akebono);
    opacity: 0;
    transition: opacity 1s ease 0.8s;
}

.closing-mark.visible {
    opacity: 0.7;
}

/* Akebono warmth for outlook section */
#section-outlook .icon-card {
    border-color: rgba(212, 137, 106, 0.15);
}

#section-outlook .kanji-marker {
    color: var(--akebono);
}

/* --- Floating Elements (Layer 2) --- */
.floating-element {
    transform-style: preserve-3d;
}

.floating-element.elevated {
    box-shadow: 0 8px 32px rgba(40, 50, 65, 0.12);
}

/* --- Section Focus State (Layer 4) --- */
.chapter.focused .section-content {
    transform: scale(1.02);
    transition: transform 0.6s ease;
}

/* --- Isometric Grid Decorations --- */
.chapter::after {
    content: '';
    position: absolute;
    bottom: -20px;
    right: 10%;
    width: 200px;
    height: 120px;
    background-image:
        linear-gradient(30deg, rgba(74, 90, 106, 0.05) 1px, transparent 1px),
        linear-gradient(-30deg, rgba(74, 90, 106, 0.05) 1px, transparent 1px);
    background-size: 20px 34px;
    pointer-events: none;
    opacity: 0.5;
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .chapter {
        padding: 40px 24px;
    }

    .section-content {
        max-width: 100%;
        padding-left: 0;
    }

    .diamond-constellation,
    .movement-cards {
        grid-template-columns: 1fr;
        gap: 20px;
        transform: rotate(0deg);
    }

    .diamond-constellation .icon-card:nth-child(2),
    .diamond-constellation .icon-card:nth-child(2).visible {
        transform: translateY(0);
    }

    .diamond-constellation .icon-card:nth-child(3),
    .diamond-constellation .icon-card:nth-child(3).visible {
        transform: translateY(0);
    }

    .diamond-constellation .icon-card:nth-child(4),
    .diamond-constellation .icon-card:nth-child(4).visible {
        transform: translateY(0);
    }

    #data-ticks {
        display: none;
    }

    #nav-indicator {
        top: 16px;
        left: 16px;
    }

    .pinned-icon {
        display: none;
    }

    .outlook-content {
        padding: 0 16px;
    }

    .vertical-poem {
        margin: 32px 0;
    }
}

@media (max-width: 480px) {
    .title-text {
        font-size: clamp(1.8rem, 8vw, 2.4rem);
    }

    .kanji-marker {
        font-size: 1.4rem;
    }

    .hud-brackets {
        display: none;
    }
}