/* ========================================
   Editorial Redesign — Warm Academic Style
   ======================================== */

:root {
    --bg-color: #FAF8F5;
    --text-color: #2D2A26;
    --vr-color: #8B3A3A;
    --desktop-color: #5C6B73;
    --control-color: #3A5A8B;
    --accent-color: #C4A35A;
    --axis-color: #D4CFC8;
    --dot-neutral: #A39E96;

    --font-display: 'Playfair Display', Georgia, 'Times New Roman', serif;
    --font-body: 'Libre Baskerville', Georgia, serif;
    --font-ui: 'Inter', 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

/* ---- Reset & Base ---- */

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

body, html {
    margin: 0;
    padding: 0;
    font-family: var(--font-body);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 400;
    margin-top: 0;
    line-height: 1.3;
}

a {
    color: var(--vr-color);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
}

a:hover {
    color: var(--accent-color);
}

/* ---- Progress Bar ---- */

#progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    width: 0%;
    background-color: var(--accent-color);
    z-index: 1000;
    transition: width 50ms linear;
}

/* ---- Hero Section ---- */

#hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem;
}

#hero h1 {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 2rem;
    max-width: 700px;
    margin-bottom: 1.5rem;
    line-height: 1.25;
}

#hero .hook {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 1.15rem;
    margin-bottom: 1rem;
    opacity: 0.85;
}

#hero .author {
    font-family: var(--font-ui);
    font-size: 0.85rem;
    letter-spacing: 0.03em;
    opacity: 0.6;
    margin-bottom: 3rem;
}

.scroll-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    opacity: 0.5;
    animation: pulse 2.5s ease-in-out infinite;
    transition: opacity 0.6s ease;
}

.scroll-indicator span {
    font-family: var(--font-ui);
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

.scroll-indicator.hidden {
    opacity: 0;
    pointer-events: none;
}

@keyframes pulse {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(6px); }
}

/* ---- Scrolltelling Layout ---- */

#scroll-container {
    display: flex;
    flex-direction: column-reverse;
    position: relative;
}

#text-column {
    padding: 0 1.5rem;
    z-index: 5;
}

/* ---- Steps ---- */

.step {
    padding: 3rem 1.5rem;
    margin-bottom: 60vh;
    border-left: 4px solid transparent;
    opacity: 0.4;
    transition: opacity 0.4s ease, border-color 0.4s ease;
}

.step:last-child {
    margin-bottom: 20vh;
}

.step.active {
    opacity: 1;
    border-left-color: var(--accent-color);
}

.step-label {
    display: block;
    font-family: var(--font-ui);
    font-weight: 500;
    font-size: 0.8rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--accent-color);
    margin-bottom: 0.75rem;
}

.step h2 {
    font-family: var(--font-display);
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

.step p {
    font-size: 1.05rem;
    margin-bottom: 1rem;
}

.step p:last-child {
    margin-bottom: 0;
}

/* ---- Chart Container ---- */

#chart-container {
    position: sticky;
    top: 0;
    height: 50vh;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    padding: 1rem;
}

/* ---- Coda / Footer ---- */

#coda {
    max-width: 640px;
    margin: 0 auto;
    padding: 6rem 2rem 4rem;
    text-align: center;
}

#coda h2 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
}

#coda p {
    font-size: 1.05rem;
    margin-bottom: 1.25rem;
    text-align: left;
}

.coda-attribution {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--axis-color);
    font-family: var(--font-ui);
    font-size: 0.9rem;
    text-align: center !important;
    line-height: 1.8;
}

/* ---- Chart Tooltip ---- */

.chart-tooltip {
    position: absolute;
    background: var(--text-color);
    color: var(--bg-color);
    font-family: var(--font-ui);
    font-size: 0.75rem;
    padding: 0.4rem 0.6rem;
    border-radius: 4px;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.15s ease;
    z-index: 100;
    white-space: nowrap;
}

/* ---- Desktop Layout ---- */

@media (min-width: 768px) {
    #hero h1 {
        font-size: 3rem;
    }

    #scroll-container {
        flex-direction: row;
        max-width: 1200px;
        margin: 0 auto;
    }

    #text-column {
        width: 50%;
        padding: 0 3rem 0 2rem;
    }

    .step {
        padding: 50vh 0;
        margin-bottom: 0;
        padding-right: 2rem;
        border-left: 4px solid transparent;
    }

    .step.active {
        border-left-color: var(--accent-color);
    }

    #chart-container {
        width: 50%;
        height: 100vh;
        padding: 2rem;
    }
}