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

html {
    overflow-x: hidden;
    max-width: 100%;
}

/* ---- Dark theme (default) ---- */
:root, [data-theme="dark"] {
    --bg: #0a0a12;
    --bg-rgb: 10, 10, 18;
    --text: #e6e6f4;
    --text-dim: #a3a3c4;
    --accent: #6366f1;
    --accent-2: #a78bfa;
    --accent-glow: rgba(99, 102, 241, 0.3);
    --card-bg: rgba(18, 18, 32, 0.92);
    --card-border: rgba(99, 102, 241, 0.12);
    --card-shadow: rgba(0, 0, 0, 0.4);
    --green: #34d399;
    --green-dim: rgba(52, 211, 153, 0.12);
    --blue: #60a5fa;
    --blue-dim: rgba(96, 165, 250, 0.12);
    --purple: #a78bfa;
    --purple-dim: rgba(167, 139, 250, 0.12);
    --gold: #fbbf24;
    --gold-dim: rgba(251, 191, 36, 0.12);
    --fig-bg: rgba(255,255,255,0.03);
    --token-removed-bg: rgba(239, 68, 68, 0.15);
    --token-removed-text: #fca5a5;
    --token-added-bg: rgba(52, 211, 153, 0.15);
    --token-added-text: #6ee7b7;
}

/* ---- Light theme ---- */
[data-theme="light"] {
    --bg: #f8f7ff;
    --bg-rgb: 248, 247, 255;
    --text: #15122e;
    --text-dim: #4a466f;
    --accent: #4f46e5;
    --accent-2: #7c3aed;
    --accent-glow: rgba(79, 70, 229, 0.2);
    --card-bg: rgba(255, 255, 255, 0.92);
    --card-border: rgba(79, 70, 229, 0.12);
    --card-shadow: rgba(79, 70, 229, 0.08);
    --green: #059669;
    --green-dim: rgba(5, 150, 105, 0.08);
    --blue: #2563eb;
    --blue-dim: rgba(37, 99, 235, 0.08);
    --purple: #7c3aed;
    --purple-dim: rgba(124, 58, 237, 0.08);
    --gold: #d97706;
    --gold-dim: rgba(217, 119, 6, 0.08);
    --fig-bg: rgba(0,0,0,0.02);
    --token-removed-bg: rgba(239, 68, 68, 0.1);
    --token-removed-text: #dc2626;
    --token-added-bg: rgba(5, 150, 105, 0.1);
    --token-added-text: #059669;
}

body {
    font-family: 'JetBrains Mono', 'Courier New', monospace;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
    max-width: 100%;
}

/* Canvas */
#landscape-canvas {
    position: fixed;
    top: 0; left: 0;
    width: 100%;
    /* 100vh: fallback. 100lvh ≈ height with mobile browser chrome retracted, so backing store
       doesn’t change when the URL bar hides after the first scroll (avoids WebGL scale jump). */
    height: 100vh;
    height: 100lvh;
    z-index: 0;
    pointer-events: none;
    /* Match page bg under WebGL so clearing hasn’t happened yet */
    background: var(--bg);
}

/* Scroll progress */
.scroll-progress {
    position: fixed;
    top: 0; left: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), var(--gold));
    z-index: 100;
    transition: width 0.1s linear;
}

/* Theme toggle */
.theme-toggle {
    position: fixed;
    top: max(1rem, env(safe-area-inset-top, 0px));
    right: max(1rem, env(safe-area-inset-right, 0px));
    z-index: 50;
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--card-border);
    border-radius: 50%;
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text);
    transition: all 0.2s ease;
}

.theme-toggle:hover {
    transform: scale(1.1);
    box-shadow: 0 0 16px var(--accent-glow);
}

.theme-toggle svg {
    width: 1.1rem;
    height: 1.1rem;
}

/* Show sun in dark, moon in light */
[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }

/* Main content */
main {
    position: relative;
    z-index: 1;
    max-width: 48rem;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ---- Funding / compute acknowledgments ---- */
.ack-banner {
    position: relative;
    width: calc(100% + 3rem);
    max-width: none;
    margin: 1.75rem -1.5rem 2rem;
    padding: 1.1rem 1.5rem 1.2rem;
    border-radius: 0.85rem;
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--card-border);
    border-left: 3px solid var(--gold);
    box-shadow:
        0 4px 28px var(--card-shadow),
        0 0 0 1px var(--gold-dim),
        inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

[data-theme="light"] .ack-banner {
    box-shadow:
        0 4px 24px var(--card-shadow),
        0 0 0 1px var(--gold-dim);
}

.ack-line {
    margin: 0;
    text-align: center;
    font-size: 0.88rem;
    line-height: 1.55;
    font-weight: 500;
    letter-spacing: 0.03em;
    background: linear-gradient(
        120deg,
        var(--gold) 0%,
        color-mix(in srgb, var(--gold) 75%, #fff 25%) 45%,
        var(--gold) 100%
    );
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 20px color-mix(in srgb, var(--gold) 35%, transparent));
}

[data-theme="light"] .ack-line {
    background: linear-gradient(
        120deg,
        #b45309 0%,
        var(--gold) 50%,
        #ca8a04 100%
    );
    -webkit-background-clip: text;
    background-clip: text;
}

.ack-line a {
    font-weight: 700;
    text-decoration: none;
    border-bottom: 1px solid color-mix(in srgb, var(--gold) 55%, transparent);
    transition: border-color 0.15s ease, filter 0.15s ease;
    /* Keep links readable inside gradient text */
    -webkit-text-fill-color: var(--gold);
    background: none;
    -webkit-background-clip: unset;
    background-clip: unset;
    filter: none;
}

.ack-line a:hover {
    border-bottom-color: var(--gold);
    filter: drop-shadow(0 0 8px color-mix(in srgb, var(--gold) 40%, transparent));
}

[data-theme="light"] .ack-line a {
    -webkit-text-fill-color: #b45309;
}

[data-theme="light"] .ack-line a:hover {
    -webkit-text-fill-color: var(--gold);
}

/* ---- Hero ---- */
#hero {
    text-align: center;
    padding: 8rem 0 4rem;
    position: relative;
    isolation: isolate;
}

#hero::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 42%;
    transform: translate(-50%, -50%);
    /* 140% + overflow-x on #hero caused a nested vertical scrollbar (overflow-y → auto). */
    width: 100%;
    height: 120%;
    z-index: -1;
    pointer-events: none;
    background: radial-gradient(
        ellipse 100% 75% at 50% 45%,
        rgba(var(--bg-rgb), 0.82) 0%,
        rgba(var(--bg-rgb), 0.45) 52%,
        transparent 72%
    );
}

.title {
    font-size: 4rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 50%, var(--purple) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    outline: none;
    filter: drop-shadow(0 2px 16px rgba(0, 0, 0, 0.65)) drop-shadow(0 0 40px rgba(10, 10, 18, 0.55));
}

[data-theme="light"] .title {
    filter: drop-shadow(0 1px 2px rgba(255, 255, 255, 0.95)) drop-shadow(0 2px 14px rgba(21, 18, 46, 0.18));
}

.subtitle {
    font-size: 1.1rem;
    color: color-mix(in srgb, var(--text) 82%, var(--text-dim));
    max-width: 40rem;
    margin: 0 auto 2rem;
    line-height: 1.6;
    font-weight: 400;
    outline: none;
    text-shadow: 0 1px 2px rgba(var(--bg-rgb), 0.9), 0 0 24px rgba(var(--bg-rgb), 0.75);
}

.meta {
    font-size: 0.85rem;
    color: color-mix(in srgb, var(--text) 70%, var(--text-dim));
    margin-bottom: 2rem;
    text-shadow: 0 1px 2px rgba(var(--bg-rgb), 0.88), 0 0 20px rgba(var(--bg-rgb), 0.65);
}

.meta a { color: var(--accent-2); text-decoration: none; text-shadow: 0 1px 2px rgba(var(--bg-rgb), 0.9); }
.meta a:hover { text-decoration: underline; }
.sep { margin: 0 0.5rem; }

.venue {
    font-size: 0.8rem;
    line-height: 1.5;
    color: color-mix(in srgb, var(--text-dim) 92%, var(--text));
    max-width: 36rem;
    margin: 0 auto 1.75rem;
    text-align: center;
    text-shadow: 0 1px 2px rgba(var(--bg-rgb), 0.88), 0 0 18px rgba(var(--bg-rgb), 0.6);
    outline: none;
}

.venue a {
    position: relative;
    z-index: 2;
    color: var(--accent-2);
    text-decoration: none;
    text-shadow: 0 1px 2px rgba(var(--bg-rgb), 0.9);
    cursor: pointer;
}

.venue a:hover {
    text-decoration: underline;
}

/* Buttons */
.links {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 0.6rem 1.8rem;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 0.5rem;
    color: var(--accent-2);
    text-decoration: none;
    font-family: inherit;
    font-size: 0.9rem;
    transition: all 0.2s ease;
    backdrop-filter: blur(8px);
}

.btn:hover {
    border-color: var(--accent);
    box-shadow: 0 0 20px var(--accent-glow);
    transform: translateY(-1px);
}

/* ---- Cards ---- */
.card {
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--card-border);
    border-radius: 1rem;
    padding: 2rem 2.5rem;
    box-shadow: 0 4px 24px var(--card-shadow);
    transition: box-shadow 0.3s ease, border-color 0.3s ease;
}

.card:hover {
    box-shadow: 0 8px 32px var(--accent-glow);
}

.card-accent-green { border-color: rgba(52, 211, 153, 0.2); }
.card-accent-green:hover { box-shadow: 0 8px 32px rgba(52, 211, 153, 0.1); }
.card-accent-blue { border-color: rgba(96, 165, 250, 0.2); }
.card-accent-blue:hover { box-shadow: 0 8px 32px rgba(96, 165, 250, 0.1); }
.card-accent-purple { border-color: rgba(167, 139, 250, 0.2); }
.card-accent-purple:hover { box-shadow: 0 8px 32px rgba(167, 139, 250, 0.1); }

[data-theme="light"] .card-accent-green { border-color: rgba(5, 150, 105, 0.2); }
[data-theme="light"] .card-accent-blue { border-color: rgba(37, 99, 235, 0.2); }
[data-theme="light"] .card-accent-purple { border-color: rgba(124, 58, 237, 0.2); }

.card h2 {
    font-size: 1.6rem;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    border-bottom: 1px solid var(--card-border);
    padding-bottom: 0.5rem;
    margin-bottom: 1.25rem;
    outline: none;
}

.card-accent-green h2 {
    background: linear-gradient(135deg, var(--green), #6ee7b7);
    -webkit-background-clip: text;
    background-clip: text;
}

[data-theme="light"] .card-accent-green h2 {
    background: linear-gradient(135deg, #059669, #10b981);
    -webkit-background-clip: text;
    background-clip: text;
}

.card-accent-blue h2 {
    background: linear-gradient(135deg, var(--blue), #93c5fd);
    -webkit-background-clip: text;
    background-clip: text;
}

[data-theme="light"] .card-accent-blue h2 {
    background: linear-gradient(135deg, #2563eb, #3b82f6);
    -webkit-background-clip: text;
    background-clip: text;
}

.card p { margin-bottom: 1rem; outline: none; }
.card p:last-child { margin-bottom: 0; }

/* ---- Styled lists ---- */
.styled-list {
    list-style: none;
    padding: 0;
    margin: 1rem 0;
}

.styled-list li {
    padding: 0.5rem 0 0.5rem 1.5rem;
    position: relative;
    outline: none;
    border-left: 2px solid var(--card-border);
    margin-bottom: 0.25rem;
}

.styled-list li::before {
    content: '';
    position: absolute;
    left: -5px;
    top: 50%;
    transform: translateY(-50%);
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--accent);
}

/* ---- Insight callouts ---- */
.callout {
    border-left: 3px solid var(--accent);
    background: var(--purple-dim);
    border-radius: 0 0.5rem 0.5rem 0;
    padding: 1rem 1.25rem;
    margin: 1.5rem 0;
}

.callout-green {
    border-left-color: var(--green);
    background: var(--green-dim);
}

.callout-blue {
    border-left-color: var(--blue);
    background: var(--blue-dim);
}

.callout-label {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 0.5rem;
    opacity: 0.7;
}

.callout-green .callout-label { color: var(--green); }
.callout-blue .callout-label { color: var(--blue); }

.callout p {
    margin: 0;
    font-size: 0.95rem;
}

/* ---- Figures ---- */
.fig {
    margin: 1.5rem 0;
}

.fig img {
    width: 100%;
    border-radius: 0.5rem;
    border: 1px solid var(--card-border);
    background: var(--fig-bg);
}

.fig figcaption {
    font-size: 0.8rem;
    color: var(--text-dim);
    margin-top: 0.75rem;
    line-height: 1.5;
    font-style: italic;
}

/* ---- PGD before/after example ---- */
.pgd-example {
    background: rgba(var(--bg-rgb), 0.5);
    border: 1px solid var(--card-border);
    border-radius: 0.75rem;
    overflow: hidden;
    margin: 1.5rem 0;
}

.pgd-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1.25rem;
    background: var(--purple-dim);
    border-bottom: 1px solid var(--card-border);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent-2);
}

.pgd-meta {
    font-size: 0.7rem;
    font-weight: 400;
    color: var(--text-dim);
    font-style: italic;
}

.pgd-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
}

.pgd-col {
    padding: 1rem 1.25rem;
}

.pgd-col:first-child {
    border-right: 1px solid var(--card-border);
}

.pgd-col-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-dim);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.pgd-text {
    font-size: 0.85rem;
    line-height: 1.7;
}

.token-highlight {
    padding: 0.1rem 0.3rem;
    border-radius: 0.2rem;
    font-weight: 600;
}

.token-removed {
    background: var(--token-removed-bg);
    color: var(--token-removed-text);
    text-decoration: line-through;
    text-decoration-color: rgba(239, 68, 68, 0.4);
}

.token-added {
    background: var(--token-added-bg);
    color: var(--token-added-text);
}

.pgd-note {
    padding: 0.75rem 1.25rem;
    font-size: 0.78rem;
    color: var(--text-dim);
    border-top: 1px solid var(--card-border);
    font-style: italic;
    margin: 0;
}

/* ---- Editable focus ---- */
[contenteditable]:focus {
    outline: none;
    text-shadow: 0 0 8px var(--accent-glow);
}

[contenteditable="true"] { cursor: text; }

/* Math blocks */
.math-block {
    margin: 1.5rem 0;
    text-align: center;
    overflow-x: auto;
}

/* Section animation */
section {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
    margin-bottom: 3rem;
}

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

#hero {
    opacity: 1;
    transform: none;
}

/* Dividers */
.divider {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    margin: 0 0 3rem;
    opacity: 0.3;
}

.divider span {
    display: block;
    width: 4px; height: 4px;
    border-radius: 50%;
    background: var(--accent);
}

.divider span:nth-child(2) {
    width: 6px; height: 6px;
    opacity: 0.8;
}

/* Footer */
footer {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 3rem 1rem 2rem;
    font-size: 0.8rem;
    color: color-mix(in srgb, var(--text-dim) 85%, var(--text));
    opacity: 0.85;
    text-shadow: 0 1px 2px rgba(var(--bg-rgb), 0.85);
}

footer p { outline: none; }

/* Strong/bold */
strong {
    color: var(--accent-2);
    font-weight: 600;
}

em {
    color: var(--accent-2);
    font-style: italic;
}

/* ---- Responsive ---- */
@media (max-width: 640px) {
    .title { font-size: 2.5rem; }
    .card { padding: 1.5rem 1.25rem; }
    /* Full-bleed calc + neg margins caused horizontal scroll on mobile; keep in flow */
    .ack-banner {
        width: 100%;
        max-width: 100%;
        margin: 1.5rem 0 1.75rem;
        padding: 1rem 1.25rem 1.1rem;
    }
    .ack-line { font-size: 0.82rem; }
    #hero { padding-top: 5rem; }

    .pgd-columns {
        grid-template-columns: 1fr;
    }
    .pgd-col:first-child {
        border-right: none;
        border-bottom: 1px solid var(--card-border);
    }
}

@media (prefers-reduced-motion: reduce) {
    section {
        opacity: 1;
        transform: none;
        transition: none;
    }
}