/* ===== Variables ===== */
:root {
    --color-bg: #000000;
    --color-text: #F5F5F7;
    --color-text-secondary: #A1A1A6;
    --color-text-muted: #86868B;
    --color-accent: #2997FF;
    --color-accent-hover: #6FB7FF;
    --color-border: rgba(255, 255, 255, 0.12);
    --color-hairline: rgba(255, 255, 255, 0.08);
    --color-surface: #0B0B0D;
    --color-surface-alt: #131316;
    --color-surface-muted: #1A1A1D;
    --color-overlay: rgba(0, 0, 0, 0.78);
    --color-shadow: rgba(0, 0, 0, 0.5);
    --color-shadow-soft: rgba(0, 0, 0, 0.18);
    --color-cta-bg: #F5F5F7;
    --color-cta-text: #0B0B0D;
    --color-nav-bg: rgba(0, 0, 0, 0.72);

    /* Fonts — Apple system stack */
    --font-display: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", "Inter", system-ui, sans-serif;
    --font-body: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Helvetica Neue", "Inter", system-ui, sans-serif;

    /* Layout */
    --max-width: 1040px;
    --max-width-narrow: 800px;
    --nav-height: 56px;

    /* Motion */
    --ease-apple: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Light Theme ===== */
[data-theme="light"] {
    --color-bg: #FBFBFD;
    --color-text: #1D1D1F;
    --color-text-secondary: #515154;
    --color-text-muted: #6E6E73;
    --color-accent: #0071E3;
    --color-accent-hover: #0077ED;
    --color-border: rgba(0, 0, 0, 0.12);
    --color-hairline: rgba(0, 0, 0, 0.08);
    --color-surface: #FFFFFF;
    --color-surface-alt: #F5F5F7;
    --color-surface-muted: #EEEEF1;
    --color-overlay: rgba(0, 0, 0, 0.55);
    --color-shadow: rgba(0, 0, 0, 0.18);
    --color-shadow-soft: rgba(0, 0, 0, 0.06);
    --color-cta-bg: #1D1D1F;
    --color-cta-text: #FFFFFF;
    --color-nav-bg: rgba(251, 251, 253, 0.72);
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
    scroll-behavior: smooth;
    background: var(--color-bg);
    color-scheme: dark;
    -webkit-text-size-adjust: 100%;
}
html[data-theme="light"] { color-scheme: light; }
body {
    font-family: var(--font-body);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    font-size: 17px;
    font-weight: 400;
    letter-spacing: -0.01em;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 240ms var(--ease-apple), color 240ms var(--ease-apple);
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

main { position: relative; z-index: 1; }

/* ===== Container ===== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Header ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: var(--nav-height);
    background: var(--color-nav-bg);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--color-hairline);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--nav-height);
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 32px;
}

.logo {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 17px;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 14px;
}

.nav-link {
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 400;
    letter-spacing: -0.01em;
    color: var(--color-text);
    opacity: 0.78;
    transition: opacity 200ms var(--ease-apple);
}
.nav-link:hover { opacity: 1; }

.nav-link[aria-current="page"] {
    opacity: 1;
    font-weight: 500;
}

/* ===== Buttons ===== */
.btn-primary,
.footer-contact-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-family: var(--font-body);
    font-size: 15px;
    font-weight: 500;
    letter-spacing: -0.01em;
    padding: 10px 22px;
    border-radius: 980px;
    background: var(--color-cta-bg);
    color: var(--color-cta-text);
    border: none;
    cursor: pointer;
    transition: opacity 220ms var(--ease-apple), transform 220ms var(--ease-apple);
}

.btn-primary:hover,
.footer-contact-btn:hover {
    opacity: 0.88;
}

.btn-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-family: var(--font-body);
    font-size: 16px;
    font-weight: 400;
    color: var(--color-accent);
    letter-spacing: -0.01em;
    transition: color 200ms var(--ease-apple);
}
.btn-link::after {
    content: "›";
    font-size: 18px;
    line-height: 1;
    transition: transform 220ms var(--ease-apple);
}
.btn-link:hover { color: var(--color-accent-hover); }
.btn-link:hover::after { transform: translateX(3px); }

.theme-toggle {
    width: 32px;
    height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    border: 1px solid var(--color-hairline);
    background: transparent;
    color: var(--color-text);
    cursor: pointer;
    font-size: 12px;
    opacity: 0.78;
    transition: opacity 200ms var(--ease-apple), border-color 200ms var(--ease-apple);
    flex-shrink: 0;
}
.theme-toggle:hover { opacity: 1; border-color: var(--color-border); }

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.1rem;
    cursor: pointer;
    color: var(--color-text);
    padding: 4px;
}

.mobile-menu-btn span,
.mobile-menu-btn span::before,
.mobile-menu-btn span::after {
    display: block;
    width: 18px;
    height: 1.5px;
    border-radius: 999px;
    background: currentColor;
}

.mobile-menu-btn span {
    position: relative;
}

.mobile-menu-btn span::before,
.mobile-menu-btn span::after {
    content: "";
    position: absolute;
    left: 0;
}

.mobile-menu-btn span::before { top: -6px; }
.mobile-menu-btn span::after { top: 6px; }

/* ===== Hero ===== */
.hero {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 160px 24px 120px;
    overflow: hidden;
}

.hero-layout {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-text {
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 880px;
}

.hero-eyebrow {
    font-family: var(--font-body);
    font-size: 19px;
    font-weight: 400;
    letter-spacing: -0.01em;
    color: var(--color-accent);
    margin-bottom: 16px;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(48px, 8vw, 88px);
    font-weight: 600;
    line-height: 1.05;
    letter-spacing: -0.035em;
    color: var(--color-text);
    margin-bottom: 22px;
}

.hero-line { display: block; }
.hero-line--accent { color: var(--color-text-muted); }

.hero-description {
    font-family: var(--font-body);
    font-size: 21px;
    font-weight: 400;
    line-height: 1.42;
    letter-spacing: -0.015em;
    color: var(--color-text-secondary);
    max-width: 640px;
    margin-bottom: 36px;
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px 14px;
}

.hero-tag {
    font-family: var(--font-body);
    font-size: 13px;
    font-weight: 400;
    color: var(--color-text-secondary);
    letter-spacing: -0.005em;
}

.hero-tag + .hero-tag::before {
    content: "·";
    margin-right: 14px;
    color: var(--color-text-muted);
    opacity: 0.6;
}

/* ===== Section Shared ===== */
.section-heading {
    font-family: var(--font-display);
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 600;
    line-height: 1.08;
    letter-spacing: -0.025em;
    margin-bottom: 16px;
    color: var(--color-text);
}

.section-eyebrow {
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: 12px;
}

.section-subheading {
    font-family: var(--font-body);
    font-size: 19px;
    font-weight: 400;
    letter-spacing: -0.012em;
    color: var(--color-text-secondary);
    margin-bottom: 64px;
    max-width: 640px;
}

/* ===== Projects ===== */
.projects {
    padding: 80px 0 120px;
    border-top: 1px solid var(--color-hairline);
}

.projects-grid {
    display: flex;
    flex-direction: column;
    gap: 96px;
}

.project-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.project-item:nth-child(even) .project-image-link {
    order: 2;
}

.project-image-link {
    display: block;
    position: relative;
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--color-hairline);
    background: var(--color-surface-alt);
    transition: transform 320ms var(--ease-apple), border-color 320ms var(--ease-apple);
}

.project-image-link:hover {
    border-color: var(--color-border);
}

.project-img {
    width: 100%;
    height: auto;
    display: block;
}

.project-meta {
    margin-bottom: 12px;
}

.project-category {
    font-family: var(--font-body);
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    color: var(--color-text-muted);
}

.project-title {
    font-family: var(--font-display);
    font-size: clamp(28px, 3.4vw, 40px);
    font-weight: 600;
    letter-spacing: -0.025em;
    line-height: 1.1;
    margin-bottom: 16px;
}

.project-title a {
    color: var(--color-text);
    transition: color 200ms var(--ease-apple);
}
.project-title a:hover { color: var(--color-accent); }

.project-description {
    font-family: var(--font-body);
    font-size: 17px;
    font-weight: 400;
    line-height: 1.5;
    letter-spacing: -0.01em;
    color: var(--color-text-secondary);
    margin-bottom: 24px;
    max-width: 520px;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 18px;
    align-items: center;
}

.project-tag {
    font-family: var(--font-body);
    font-size: 15px;
    font-weight: 400;
    color: var(--color-accent);
    letter-spacing: -0.005em;
    transition: color 200ms var(--ease-apple);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.project-tag::after {
    content: "›";
    transition: transform 220ms var(--ease-apple);
}
.project-tag:hover { color: var(--color-accent-hover); }
.project-tag:hover::after { transform: translateX(3px); }

.project-tag-plain {
    font-family: var(--font-body);
    font-size: 13px;
    color: var(--color-text-muted);
    letter-spacing: -0.005em;
}

/* ===== Teaser sections (index) ===== */
.learn-teaser,
.about-teaser {
    padding: 96px 0;
    border-top: 1px solid var(--color-hairline);
}

.learn-teaser-layout,
.about-teaser-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(280px, 0.7fr);
    gap: 64px;
    align-items: start;
}

.learn-teaser-text,
.about-teaser-text {
    font-family: var(--font-body);
    font-size: 19px;
    line-height: 1.5;
    letter-spacing: -0.012em;
    color: var(--color-text-secondary);
    max-width: 560px;
    margin-bottom: 28px;
}

.learn-teaser-card,
.about-teaser-panel {
    padding: 28px 32px;
    border-radius: 16px;
    background: var(--color-surface);
    border: 1px solid var(--color-hairline);
}

.learn-teaser-label,
.about-teaser-label {
    font-family: var(--font-body);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: 14px;
}

.learn-teaser-list {
    color: var(--color-text);
    font-size: 16px;
    line-height: 1.5;
    letter-spacing: -0.01em;
}
.learn-teaser-list li {
    padding: 10px 0;
    border-bottom: 1px solid var(--color-hairline);
}
.learn-teaser-list li:last-child { border-bottom: none; }

.skills-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 16px;
}

.skill {
    font-family: var(--font-body);
    font-size: 14px;
    color: var(--color-text-secondary);
    font-weight: 400;
    letter-spacing: -0.005em;
}
.skill + .skill::before {
    content: "·";
    margin-right: 16px;
    color: var(--color-text-muted);
    opacity: 0.5;
}

/* ===== Page intro (about + learn) ===== */
.page-intro {
    padding: calc(var(--nav-height) + 96px) 0 56px;
}

.page-title {
    font-family: var(--font-display);
    font-size: clamp(40px, 6vw, 64px);
    font-weight: 600;
    line-height: 1.07;
    letter-spacing: -0.03em;
    color: var(--color-text);
    margin-bottom: 20px;
    max-width: 880px;
}

.page-description {
    max-width: 720px;
    font-family: var(--font-body);
    font-size: 21px;
    font-weight: 400;
    line-height: 1.42;
    letter-spacing: -0.015em;
    color: var(--color-text-secondary);
}

/* ===== Decks Section ===== */
.decks-section {
    padding: 80px 0 96px;
    border-top: 1px solid var(--color-hairline);
}

.decks-heading {
    margin-bottom: 56px;
    max-width: 720px;
}

.decks-series-summary {
    margin-top: 12px;
}

.decks-series-count {
    display: inline-block;
    margin-bottom: 12px;
    font-family: var(--font-body);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--color-text-muted);
}

.decks-series-copy {
    font-family: var(--font-body);
    font-size: 19px;
    line-height: 1.5;
    letter-spacing: -0.012em;
    color: var(--color-text-secondary);
}

.decks-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 32px;
}

.deck-item {
    appearance: none;
    width: 100%;
    border: none;
    background: transparent;
    color: inherit;
    text-align: left;
    padding: 0;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    transition: opacity 220ms var(--ease-apple);
}

.deck-item:hover { opacity: 0.85; }
.deck-item:hover .deck-thumb { border-color: var(--color-border); }

.deck-thumb {
    width: 100%;
    aspect-ratio: 960 / 535;
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 16px;
    background: var(--color-surface-alt);
    border: 1px solid var(--color-hairline);
    transition: border-color 220ms var(--ease-apple);
}

.deck-preview-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    object-position: top;
    display: block;
}

.deck-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}

.deck-number {
    font-family: var(--font-body);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
}

.deck-topic {
    font-family: var(--font-body);
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--color-text-muted);
}

.deck-title {
    font-family: var(--font-display);
    font-size: 19px;
    font-weight: 600;
    letter-spacing: -0.018em;
    line-height: 1.25;
    color: var(--color-text);
    margin-bottom: 6px;
}

.deck-description {
    font-family: var(--font-body);
    font-size: 14px;
    line-height: 1.45;
    letter-spacing: -0.005em;
    color: var(--color-text-secondary);
}

.deck-series-note {
    margin-top: 40px;
    max-width: 720px;
    font-family: var(--font-body);
    font-size: 14px;
    line-height: 1.5;
    color: var(--color-text-muted);
}

/* ===== Prompts Section ===== */
.prompts-section {
    padding: 80px 0 96px;
    border-top: 1px solid var(--color-hairline);
}

.prompts-heading {
    margin-bottom: 40px;
    max-width: 760px;
}

.prompts-section-copy {
    margin-top: 14px;
    font-family: var(--font-body);
    font-size: 18px;
    line-height: 1.5;
    letter-spacing: -0.01em;
    color: var(--color-text-secondary);
}

.prompts-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0;
}

.prompt-card {
    display: grid;
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 40px;
    padding: 28px 0;
    border-top: 1px solid var(--color-hairline);
    color: inherit;
}
.prompt-card:last-child { border-bottom: 1px solid var(--color-hairline); }

.prompt-card-meta {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    margin-bottom: 0;
}

.prompt-card-type,
.prompt-card-status {
    font-family: var(--font-body);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-text-muted);
}

.prompt-card-status {
    letter-spacing: 0.04em;
    text-transform: none;
}

.prompt-card-title {
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: var(--color-text);
    margin-bottom: 10px;
}

.prompt-card-description {
    font-family: var(--font-body);
    font-size: 15px;
    line-height: 1.5;
    letter-spacing: -0.005em;
    color: var(--color-text-secondary);
}

.prompt-card-link {
    display: inline-flex;
    align-items: center;
    margin-top: 16px;
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: -0.005em;
    color: var(--color-accent);
    transition: color 200ms var(--ease-apple);
}
.prompt-card-link:hover { color: var(--color-accent-hover); }

/* ===== GitHub Repos Section ===== */
.github-section {
    padding: 80px 0 96px;
    border-top: 1px solid var(--color-hairline);
}

.repo-list {
    display: flex;
    flex-direction: column;
    margin-top: 40px;
}

.repo-list-item {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 32px;
    align-items: start;
    padding: 28px 0;
    border-top: 1px solid var(--color-hairline);
}
.repo-list-item:last-child {
    border-bottom: 1px solid var(--color-hairline);
}

.repo-list-title {
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 600;
    letter-spacing: -0.018em;
    margin-bottom: 8px;
}

.repo-list-title a {
    color: var(--color-text);
    transition: color 200ms var(--ease-apple);
}
.repo-list-title a:hover { color: var(--color-accent); }

.repo-list-description {
    max-width: 640px;
    font-family: var(--font-body);
    font-size: 16px;
    font-weight: 400;
    line-height: 1.5;
    letter-spacing: -0.01em;
    color: var(--color-text-secondary);
}

.repo-list-meta {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 12px;
    min-width: 200px;
}

.repo-list-tags {
    font-family: var(--font-body);
    font-size: 13px;
    color: var(--color-text-muted);
    text-align: right;
    letter-spacing: -0.005em;
}

/* ===== Learn Sections (placeholders) ===== */
.learn-sections {
    padding: 80px 0 96px;
    border-top: 1px solid var(--color-hairline);
}

.learn-section-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 32px;
    margin-top: 40px;
}

.learn-section-card {
    padding: 0;
}

.learn-section-label {
    font-family: var(--font-body);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: 12px;
}

.learn-section-title {
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 10px;
    color: var(--color-text);
}

.learn-section-description {
    font-family: var(--font-body);
    font-size: 15px;
    font-weight: 400;
    line-height: 1.5;
    letter-spacing: -0.005em;
    color: var(--color-text-secondary);
}

body[data-page="about"] .page-intro {
    padding-bottom: 0;
}

body[data-page="privacy"] .page-intro {
    padding-bottom: 0;
}

/* ===== About Page ===== */
.about-page {
    padding: 36px 0 96px;
}

.policy-page {
    padding: 36px 0 96px;
}

.policy-content {
    max-width: 760px;
}

.policy-section {
    padding: 40px 0;
    border-top: 1px solid var(--color-hairline);
}
.policy-section:first-of-type { border-top: none; padding-top: 0; }

.policy-section h2 {
    font-family: var(--font-display);
    font-size: clamp(22px, 3vw, 28px);
    font-weight: 600;
    line-height: 1.15;
    color: var(--color-text);
    margin-bottom: 16px;
}

.policy-section p {
    font-family: var(--font-body);
    font-size: 17px;
    line-height: 1.6;
    color: var(--color-text-secondary);
    margin-bottom: 16px;
}
.policy-section p:last-child { margin-bottom: 0; }

.policy-section a,
.footer-copy a {
    color: var(--color-text);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
}

.about-section {
    padding: 56px 0;
    border-top: 1px solid var(--color-hairline);
}
.about-section:first-of-type { border-top: none; padding-top: 0; }

.about-section-header {
    margin-bottom: 32px;
}

.about-section-eyebrow {
    font-family: var(--font-body);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: 10px;
}

.about-section-heading {
    font-family: var(--font-display);
    font-size: clamp(28px, 4vw, 36px);
    font-weight: 600;
    letter-spacing: -0.025em;
    line-height: 1.1;
    color: var(--color-text);
}

.about-prose p {
    font-family: var(--font-body);
    font-size: 19px;
    line-height: 1.5;
    letter-spacing: -0.012em;
    color: var(--color-text-secondary);
    margin-bottom: 18px;
    max-width: 760px;
}
.about-prose p:last-child { margin-bottom: 0; }

/* Experience timeline */
.experience-list {
    display: flex;
    flex-direction: column;
}

.experience-item {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 48px;
    padding: 28px 0;
    border-top: 1px solid var(--color-hairline);
    align-items: start;
}
.experience-item:last-child { border-bottom: 1px solid var(--color-hairline); }

.experience-dates {
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-muted);
    letter-spacing: -0.005em;
    padding-top: 4px;
}

.experience-role {
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-text);
    margin-bottom: 4px;
}

.experience-company {
    font-family: var(--font-body);
    font-size: 15px;
    color: var(--color-text-secondary);
    margin-bottom: 14px;
    letter-spacing: -0.005em;
}

.experience-bullets {
    margin: 0;
    padding: 0;
    list-style: none;
}

.experience-bullets li {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.5;
    letter-spacing: -0.008em;
    color: var(--color-text-secondary);
    padding-left: 20px;
    position: relative;
    margin-bottom: 8px;
    max-width: 760px;
}
.experience-bullets li:last-child { margin-bottom: 0; }
.experience-bullets li::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 11px;
    width: 4px;
    height: 4px;
    background: var(--color-text-muted);
    border-radius: 50%;
}

/* Education + Capabilities lists */
.fact-list {
    display: flex;
    flex-direction: column;
}
.fact-item {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 48px;
    padding: 18px 0;
    border-top: 1px solid var(--color-hairline);
    align-items: baseline;
}
.fact-item:last-child { border-bottom: 1px solid var(--color-hairline); }
.fact-label {
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-muted);
    letter-spacing: -0.005em;
}
.fact-value {
    font-family: var(--font-body);
    font-size: 17px;
    color: var(--color-text);
    letter-spacing: -0.01em;
    line-height: 1.45;
}
.fact-value-secondary {
    color: var(--color-text-secondary);
    font-size: 15px;
    margin-top: 2px;
}

.resume-download {
    margin-top: 32px;
}

/* ===== Footer ===== */
.footer {
    padding: 80px 0 32px;
    text-align: center;
    border-top: 1px solid var(--color-hairline);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.footer-thanks {
    font-family: var(--font-display);
    font-size: clamp(22px, 2.5vw, 28px);
    font-weight: 600;
    letter-spacing: -0.022em;
    color: var(--color-text);
    margin-bottom: 4px;
}

.footer-cta-text {
    font-family: var(--font-body);
    font-size: 17px;
    font-weight: 400;
    line-height: 1.5;
    letter-spacing: -0.01em;
    color: var(--color-text-secondary);
    max-width: 540px;
    margin-bottom: 12px;
}

.footer-social {
    display: flex;
    gap: 24px;
    margin-top: 24px;
}

.social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    color: var(--color-text-muted);
    transition: color 200ms var(--ease-apple);
}
.social-link:hover { color: var(--color-text); }
.social-link svg {
    display: block;
    width: 20px;
    height: 20px;
    fill: currentColor;
}

.footer-copy {
    font-family: var(--font-body);
    font-size: 12px;
    font-weight: 400;
    color: var(--color-text-muted);
    margin-top: 32px;
    letter-spacing: -0.005em;
}

/* ===== Focus styles ===== */
:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 3px;
    border-radius: 4px;
}
.deck-item:focus-visible,
.btn-primary:focus-visible,
.footer-contact-btn:focus-visible {
    outline-offset: 4px;
}

/* ===== PDF Modal ===== */
.pdf-modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 500;
    background: var(--color-overlay);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.pdf-modal.open { display: flex; }

.pdf-modal-inner {
    background: var(--color-surface);
    border-radius: 18px;
    width: 100%;
    max-width: 960px;
    height: 90vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border: 1px solid var(--color-hairline);
    box-shadow: 0 40px 80px var(--color-shadow);
}

.pdf-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--color-hairline);
    flex-shrink: 0;
}

.pdf-modal-title {
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text);
    letter-spacing: -0.005em;
}

.pdf-modal-close {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 14px;
    color: var(--color-text-muted);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    transition: color 200ms var(--ease-apple), background 200ms var(--ease-apple);
}

.pdf-modal-close:hover {
    color: var(--color-text);
    background: var(--color-surface-alt);
}

.pdf-modal-body { flex: 1; overflow: hidden; }

.pdf-frame {
    width: 100%;
    height: 100%;
    border: none;
    display: block;
}

/* ===== Fade-in animation ===== */
.fade-in {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 600ms var(--ease-apple), transform 600ms var(--ease-apple);
}
.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Hero entrance ===== */
@media (prefers-reduced-motion: no-preference) {
    .hero-eyebrow,
    .hero-line,
    .hero-description,
    .hero-tags {
        opacity: 0;
        transform: translateY(12px);
        animation: heroReveal 0.7s var(--ease-apple) forwards;
    }
    .hero-eyebrow             { animation-delay: 0.05s; }
    .hero-line:nth-child(1)   { animation-delay: 0.15s; }
    .hero-line:nth-child(2)   { animation-delay: 0.25s; }
    .hero-description         { animation-delay: 0.4s; }
    .hero-tags                { animation-delay: 0.55s; }
}

@keyframes heroReveal {
    to { opacity: 1; transform: translateY(0); }
}

/* ===== Responsive ===== */
@media (max-width: 960px) {
    .project-item {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    .project-item:nth-child(even) .project-image-link { order: 0; }
    .learn-teaser-layout,
    .about-teaser-layout {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .repo-list-item {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    .repo-list-meta {
        align-items: flex-start;
        min-width: 0;
    }
    .repo-list-tags { text-align: left; }
    .experience-item,
    .fact-item {
        grid-template-columns: 1fr;
        gap: 8px;
    }
    .decks-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .prompt-card {
        grid-template-columns: 1fr;
        gap: 18px;
    }
    .learn-section-grid { grid-template-columns: 1fr; gap: 40px; }
}

@media (max-width: 720px) {
    .nav { padding: 0 20px; }
    .nav-links {
        position: fixed;
        top: var(--nav-height);
        left: 0; right: 0;
        background: var(--color-bg);
        flex-direction: column;
        align-items: center;
        padding: 32px;
        gap: 24px;
        border-bottom: 1px solid var(--color-hairline);
        transform: translateY(-110%);
        opacity: 0;
        visibility: hidden;
        transition: all 280ms var(--ease-apple);
    }
    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    .mobile-menu-btn { display: block; }

    .decks-grid { grid-template-columns: 1fr; }
    .hero { padding: 120px 20px 80px; }
    .projects { padding: 56px 0 80px; }
    .projects-grid { gap: 64px; }
    .learn-teaser, .about-teaser, .decks-section, .prompts-section, .github-section, .learn-sections { padding: 64px 0; }
}

@media (max-width: 480px) {
    .container { padding: 0 20px; }
    .hero-title { letter-spacing: -0.025em; }
    .footer { padding: 56px 0 24px; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-delay: 0ms !important;
        transition-duration: 0.01ms !important;
        transition-delay: 0ms !important;
    }
    .fade-in { opacity: 1; transform: none; }
}