/* naru.day — Swiss + Aurora Design */

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

:root {
    --void: #0b0d1a;
    --ice: #f0f1f7;
    --cyan: #06b6d4;
    --silver: #c8c9d4;
    --violet: #8b5cf6;
    --amber: #f59e0b;
    --mint: #5de8b5;
    --deep: #151829;
    --deep-alt: #1a1c2e;
    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'DM Mono', monospace;
}

html, body {
    height: 100%;
    overflow: hidden;
    background: var(--void);
    color: var(--ice);
    font-family: var(--font-body);
}

/* Aurora background */
.aurora-bg {
    position: fixed;
    inset: 0;
    z-index: 0;
    opacity: 0.15;
    background: 
        radial-gradient(ellipse 80% 50% at 20% 50%, #5de8b520 0%, transparent 70%),
        radial-gradient(ellipse 60% 40% at 80% 30%, #8b5cf615 0%, transparent 60%),
        radial-gradient(ellipse 70% 60% at 50% 80%, #06b6d410 0%, transparent 50%);
    animation: aurora-shift 20s ease-in-out infinite alternate;
    pointer-events: none;
}

@keyframes aurora-shift {
    0% { transform: scale(1) translateY(0); }
    100% { transform: scale(1.1) translateY(-5%); }
}

/* Grid overlay */
.grid-overlay {
    position: fixed;
    inset: 0;
    z-index: 1;
    pointer-events: none;
    background-image: 
        linear-gradient(to right, rgba(240, 241, 247, 0.03) 1px, transparent 1px);
    background-size: calc(100% / 12) 100%;
    opacity: 0.4;
}

/* Split layout */
.split-layout {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 40fr 60fr;
    height: 100vh;
    width: 100vw;
}

/* Left panel */
.panel-left {
    position: relative;
    height: 100vh;
    border-right: 1px solid rgba(240, 241, 247, 0.06);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--deep);
    border-color: var(--deep-alt);
}

.panel-left-inner {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    padding: 3rem 2rem;
}

.logo {
    font-family: var(--font-display);
    font-weight: 300;
    font-size: 1.2rem;
    letter-spacing: 0.1em;
    color: var(--silver);
    text-transform: lowercase;
}

/* Navigation dots */
.nav-chapters {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    position: absolute;
    left: 2rem;
    top: 50%;
    transform: translateY(-50%);
}

.nav-dot {
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.25rem 0;
}

.nav-dot::before {
    content: '';
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--silver);
    opacity: 0.3;
    transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.nav-dot.active::before {
    background: var(--mint);
    opacity: 1;
    box-shadow: 0 0 12px rgba(93, 232, 181, 0.5);
    transform: scale(1.4);
}

.nav-dot span {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--silver);
    opacity: 0;
    transform: translateX(-8px);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    text-transform: lowercase;
}

.nav-dot.active span,
.nav-dot:hover span {
    opacity: 0.7;
    transform: translateX(0);
}

/* Flowing curve SVG */
.flowing-curve {
    position: absolute;
    width: 80%;
    height: 60%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0.8;
}

.curve-main {
    transition: d 1.2s cubic-bezier(0.16, 1, 0.3, 1);
    filter: drop-shadow(0 0 6px rgba(93, 232, 181, 0.4));
}

.curve-ghost {
    transition: d 1.8s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Chapter counter */
.chapter-counter {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--silver);
    opacity: 0.5;
}

.counter-current {
    color: var(--mint);
    font-size: 1.2rem;
    opacity: 1;
}

.counter-divider {
    margin: 0 0.3rem;
}

/* Right panel */
.panel-right {
    position: relative;
    height: 100vh;
    overflow: hidden;
}

/* Chapters */
.chapter {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    pointer-events: none;
}

.chapter.active {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.chapter-content {
    max-width: 540px;
    padding: 2rem;
}

.headline {
    font-family: var(--font-display);
    font-size: clamp(3rem, 8vw, 7.5rem);
    font-weight: 300;
    letter-spacing: -0.03em;
    line-height: 0.95;
    margin-bottom: 2rem;
    background: linear-gradient(135deg, var(--ice) 0%, var(--mint) 50%, var(--cyan) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% 200%;
    animation: gradient-text 8s ease-in-out infinite alternate;
}

@keyframes gradient-text {
    0% { background-position: 0% 50%; }
    100% { background-position: 100% 50%; }
}

.body-text {
    font-family: var(--font-body);
    font-size: 1.05rem;
    font-weight: 400;
    line-height: 1.7;
    color: var(--silver);
    margin-bottom: 1.5rem;
    max-width: 420px;
}

.mono-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--cyan);
    opacity: 0.6;
    text-transform: lowercase;
}

/* Scroll indicator */
.scroll-indicator {
    position: absolute;
    bottom: 3rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    opacity: 0.5;
    transition: opacity 0.5s;
}

.scroll-text {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--silver);
    text-transform: lowercase;
    letter-spacing: 0.05em;
}

.scroll-arrow {
    width: 1px;
    height: 24px;
    background: linear-gradient(to bottom, var(--mint), transparent);
    animation: arrow-pulse 2s ease-in-out infinite;
}

@keyframes arrow-pulse {
    0%, 100% { opacity: 1; transform: scaleY(1); }
    50% { opacity: 0.3; transform: scaleY(0.6); }
}

/* Mobile */
@media (max-width: 768px) {
    .split-layout {
        grid-template-columns: 1fr;
        grid-template-rows: 120px 1fr;
    }

    .panel-left {
        height: 120px;
        border-right: none;
        border-bottom: 1px solid rgba(240, 241, 247, 0.06);
    }

    .panel-left-inner {
        flex-direction: row;
        padding: 1rem 1.5rem;
    }

    .nav-chapters {
        position: static;
        flex-direction: row;
        transform: none;
        gap: 1rem;
    }

    .nav-dot span { display: none; }

    .flowing-curve { display: none; }

    .chapter-counter { display: none; }

    .headline {
        font-size: clamp(2rem, 10vw, 4rem);
    }
}