/* ── Theme Variables ── */
:root {
    --bg-color: #ffffff;
    --bg-secondary: #f2f2f7;
    --primary-color: #000000;
    --secondary-color: #8e8e93;
    --card-bg-center: rgba(255, 255, 255, 0.8);
    --card-bg-edge: rgba(0, 0, 0, 0.08);
    --border-color: rgba(0, 0, 0, 0.1);
    --hover-bg: rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] {
    --bg-color: #000000;
    --bg-secondary: #1c1c1e;
    --primary-color: #ffffff;
    --secondary-color: #8e8e93;
    --card-bg-center: rgba(255, 255, 255, 0.08);
    --card-bg-edge: rgba(255, 255, 255, 0.08);
    --border-color: rgba(255, 255, 255, 0.1);
    --hover-bg: rgba(255, 255, 255, 0.12);
}

@media (prefers-color-scheme: dark) {
    [data-theme="system"] {
        --bg-color: #000000;
        --bg-secondary: #1c1c1e;
        --primary-color: #ffffff;
        --secondary-color: #8e8e93;
        --card-bg-center: rgba(255, 255, 255, 0.08);
        --card-bg-edge: rgba(255, 255, 255, 0.08);
        --border-color: rgba(255, 255, 255, 0.1);
        --hover-bg: rgba(255, 255, 255, 0.12);
    }
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', sans-serif;
    background: var(--bg-color);
    color: var(--primary-color);
    transition: background 0.4s ease-in-out, color 0.4s ease-in-out;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; text-decoration: none; }

/* ── Theme Switcher ── */
.theme-switcher {
    display: flex;
    gap: 4px;
    background: var(--hover-bg);
    border-radius: 999px;
    padding: 3px;
}

.theme-btn {
    background: none;
    border: none;
    color: var(--secondary-color);
    cursor: pointer;
    padding: 6px 8px;
    border-radius: 999px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-btn.active {
    background: var(--border-color);
    color: var(--primary-color);
}

/* ── Container ── */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ── Hero ── */
.hero {
    padding: 80px 0 2px;
    display: flex;
    align-items: center;
    gap: 24px;
}

.hero-left {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.hero-name {
    font-family: 'Major Mono Display', monospace;
    font-size: clamp(28px, 6vw, 48px);
    font-weight: 400;
    line-height: 0.95;
    letter-spacing: 0.02em;
    text-align: left;
}

.inline-link {
    text-decoration: none;
    text-underline-offset: 3px;
}

.inline-link:hover {
    text-decoration: underline;
}

.hero-text {
    font-size: clamp(14px, 2vw, 16px);
    font-weight: 500;
    line-height: 1.6;
}

.hero-right {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin-left: auto;
    gap: 16px;
    flex-shrink: 0;
}

.cv-pill {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 16px;
    width: 100%;
    box-sizing: border-box;
    border-radius: 999px;
    font-size: 14px;
    font-weight: 700;
    background: var(--hover-bg);
    color: var(--primary-color);
    transition: background 0.2s ease, color 0.2s ease;
}

.cv-pill:hover {
    background: var(--primary-color);
    color: var(--bg-color);
}

.cv-pill:hover .cv-pill-icon {
    filter: brightness(0) invert(1);
}

[data-theme="dark"] .cv-pill:hover .cv-pill-icon {
    filter: brightness(0);
}

@media (prefers-color-scheme: dark) {
    [data-theme="system"] .cv-pill:hover .cv-pill-icon {
        filter: brightness(0);
    }
}

.cv-pill-icon {
    width: 16px;
    height: 16px;
    filter: brightness(0);
}

[data-theme="dark"] .cv-pill-icon {
    filter: brightness(0) invert(1);
}

@media (prefers-color-scheme: dark) {
    [data-theme="system"] .cv-pill-icon {
        filter: brightness(0) invert(1);
    }
}

.social-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

/* ── Sections ── */
.section {
    padding: 40px 0;
}

.section h2 {
    font-family: 'Major Mono Display', monospace;
    font-size: clamp(20px, 4vw, 32px);
    font-weight: 400;
    line-height: 1.15;
    letter-spacing: 0.02em;
    margin-bottom: 24px;
}

/* ── Card Base ── */
.card {
    background: radial-gradient(ellipse at center, var(--card-bg-center) 0%, var(--card-bg-center) 50%, var(--card-bg-edge) 100%);
    border-radius: 30px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: background 0.4s ease-in-out, transform 0.2s ease, box-shadow 0.2s ease;
}

a.card:hover {
    transform: scale(1.02);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
}

/* ── App Cards ── */
.apps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}


.app-card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-end;
    text-align: left;
    padding: 24px 16px;
    aspect-ratio: 1 / 1;
    position: relative;
    cursor: pointer;
}

.app-card::before {
    content: '';
    position: absolute;
    top: 35%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 150px;
    height: 150px;
    border-radius: 50%;
    filter: blur(40px);
    background: radial-gradient(circle, rgba(0, 0, 0, 0.4) 0%, rgba(0, 0, 0, 0) 70%);
    z-index: 0;
}

[data-theme="dark"] .app-card::before {
    background: radial-gradient(circle, rgba(255, 255, 255, 0.4) 0%, rgba(255, 255, 255, 0) 70%);
}

@media (prefers-color-scheme: dark) {
    [data-theme="system"] .app-card::before {
        background: radial-gradient(circle, rgba(255, 255, 255, 0.4) 0%, rgba(255, 255, 255, 0) 70%);
    }
}

.app-card-icon {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    margin: 0 0 8px 0;
    margin-top: auto;
    display: block;
    position: relative;
    z-index: 1;
}

.app-card-title {
    font-size: clamp(13px, 2.2vw, 15px);
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 6px;
}

.app-card-subtitle {
    font-size: clamp(12px, 1.8vw, 13px);
    font-weight: 400;
    line-height: 1.4;
    opacity: 0.9;
}

/* ── App Card with Side Image ── */
.app-card.app-card-with-img {
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-end;
    aspect-ratio: auto;
    overflow: hidden;
    position: relative;
}

.app-card-with-img .app-card-info {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-end;
    min-width: 0;
    position: relative;
    z-index: 1;
}

.app-card-side-img {
    position: absolute;
    right: 0;
    top: 0;
    height: 100%;
    width: 55%;
    object-fit: cover;
    object-position: right center;
    border-radius: 0;
    mask-image: linear-gradient(to right, transparent 0%, black 75%);
    -webkit-mask-image: linear-gradient(to right, transparent 0%, black 75%);
    filter: grayscale(100%);
    opacity: 0.25;
    transition: filter 0.3s ease, opacity 0.3s ease;
}

.app-card-with-img:hover .app-card-side-img {
    filter: grayscale(0%);
    opacity: 0.6;
}

.app-card-with-img:hover .app-card-title,
.app-card-with-img:hover .app-card-subtitle {
    text-shadow: 0 1px 8px rgba(0, 0, 0, 0.35);
}

.app-card-with-img::before {
    display: none;
}

.vn-dark-img { display: none; }
.vn-light-img { display: block; }

[data-theme="dark"] .vn-dark-img { display: block; }
[data-theme="dark"] .vn-light-img { display: none; }

@media (prefers-color-scheme: dark) {
    [data-theme="system"] .vn-dark-img { display: block; }
    [data-theme="system"] .vn-light-img { display: none; }
}

/* ── Featured App Card ── */
.app-card.app-card-featured {
    grid-column: span 2;
    aspect-ratio: auto;
    flex-direction: row;
    align-items: stretch;
    justify-content: space-between;
    padding: 24px;
    gap: 32px;
    position: relative;
    overflow: hidden;
}

.app-card-featured::before {
    display: none;
}

.app-badge {
    font-size: 9px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 4px 12px;
    border-radius: 999px;
    background: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    align-self: flex-start;
}

.app-card-featured-left {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    flex-shrink: 0;
    gap: 8px;
    position: relative;
    z-index: 1;
}

.app-card-featured-bottom {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
}

.app-card-featured-left .app-card-icon {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    margin: 0;
    margin-top: auto;
}

.app-card-featured-img {
    position: absolute;
    right: 0;
    top: 0;
    height: 100%;
    width: 55%;
    object-fit: cover;
    object-position: right center;
    border-radius: 0;
    mask-image: linear-gradient(to right, transparent 0%, black 70%);
    -webkit-mask-image: linear-gradient(to right, transparent 0%, black 70%);
    filter: grayscale(100%);
    opacity: 0.25;
    transition: filter 0.3s ease, opacity 0.3s ease;
}

.app-card-featured:hover .app-card-featured-img {
    filter: grayscale(0%);
    opacity: 0.6;
}

.app-card-featured:hover .app-card-title,
.app-card-featured:hover .app-card-subtitle {
    text-shadow: 0 1px 8px rgba(0, 0, 0, 0.35);
}

/* ── Open Source Cards ── */
.oss-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
}

.oss-card {
    display: flex;
    flex-direction: column;
    padding: 20px;
    gap: 8px;
    cursor: pointer;
}

.oss-lang {
    font-size: 12px;
    font-weight: 500;
    color: var(--secondary-color);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.oss-title {
    font-size: 15px;
    font-weight: 600;
    line-height: 1.3;
}

.oss-desc {
    font-size: 13px;
    font-weight: 400;
    line-height: 1.5;
    color: var(--secondary-color);
}

/* ── Talk Cards ── */
.talks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.talk-card {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    cursor: pointer;
}

.talk-thumb-wrap {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    border-radius: 30px 30px 0 0;
}

.talk-thumb {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.play-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 56px;
    height: 56px;
    background: rgba(0, 0, 0, 0.6);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    opacity: 1;
}

.talk-title {
    font-size: clamp(14px, 2vw, 16px);
    font-weight: 600;
    line-height: 1.4;
    padding: 16px 20px 6px;
}

.talk-subtitle {
    font-size: 13px;
    font-weight: 400;
    color: var(--secondary-color);
    padding: 0 20px 20px;
}

.social-btn {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--hover-bg);
    color: var(--primary-color);
    transition: background 0.2s ease, color 0.2s ease;
}

.social-btn:hover {
    background: var(--primary-color);
    color: var(--bg-color);
}

/* ── Emergency Responder ── */
.responder-card {
    position: relative;
    overflow: hidden;
    min-height: 350px;
}

.responder-bg-img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 60%;
    object-fit: cover;
    object-position: center top;
    mask-image: linear-gradient(to bottom, black 30%, transparent 100%);
    -webkit-mask-image: linear-gradient(to bottom, black 30%, transparent 100%);
    filter: grayscale(100%);
    opacity: 0.25;
    transition: filter 0.3s ease, opacity 0.3s ease;
    pointer-events: none;
}

.responder-card:hover .responder-bg-img {
    filter: grayscale(0%);
    opacity: 0.6;
}

.responder-card:hover .responder-text {
    text-shadow: 0 1px 8px rgba(0, 0, 0, 0.35);
}

.responder-card:hover .responder-icon {
    filter: drop-shadow(0 1px 8px rgba(0, 0, 0, 0.35));
}

.responder-card .responder-icon,
.responder-card .responder-text {
    position: relative;
    z-index: 1;
}

.responder-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.responder-card {
    padding: 24px;
    padding-top: 110px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    justify-content: flex-start;
}

.responder-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--hover-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
}

.responder-svg {
    filter: brightness(0);
}

[data-theme="dark"] .responder-svg {
    filter: brightness(0) invert(1);
}

@media (prefers-color-scheme: dark) {
    [data-theme="system"] .responder-svg {
        filter: brightness(0) invert(1);
    }
}

.responder-text {
    font-size: clamp(14px, 2vw, 16px);
    font-weight: 400;
    line-height: 1.6;
}

.responder-text strong {
    font-weight: 600;
}

/* ── Footer ── */
.footer {
    padding: 24px 20px;
    font-size: 13px;
    color: var(--secondary-color);
    border-top: 1px solid var(--border-color);
}

.footer-inner {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* ── Responsive ── */
@media (max-width: 768px) {
    .container { padding: 0 16px; }
    .hero { padding: 60px 0 32px; }
    .section { padding: 32px 0; }
    .section h2 { margin-bottom: 20px; }

    .hero { flex-direction: column; text-align: left; gap: 16px; }
    .hero-right { flex-direction: row; align-items: center; margin-left: 0; gap: 10px; }
    .hero-right .cv-pill { width: auto; height: 48px; padding: 0 20px; }
    .social-grid { grid-template-columns: repeat(4, auto); gap: 10px; }
    .hero-spacer { display: none; }

    .card { border-radius: 24px; }

    .apps-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
    .app-card.app-card-featured { grid-column: 1 / -1; flex-direction: column; }
    .app-card-featured-img { display: none; }
    .app-card-side-img { display: none; }
    .vn-dark-img, .vn-light-img { display: none !important; }
    .app-card { padding: 20px 14px; align-items: flex-start; text-align: left; }
    .app-card.app-card-with-img { flex-direction: column; }
    .app-card-with-img .app-card-info { justify-content: flex-end; width: 100%; }
    .app-card-icon { width: 64px; height: 64px; border-radius: 16px; margin-bottom: 8px; }

    .talks-grid { grid-template-columns: 1fr; }
    .talk-thumb-wrap { border-radius: 24px 24px 0 0; }

    .oss-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
    .oss-card { padding: 16px; }

    .responder-grid { grid-template-columns: 1fr; }
    .responder-bg-img { display: none; }
    .responder-card { min-height: unset; padding-top: 24px; }
}

@media (max-width: 480px) {
    .card { border-radius: 20px; }
    .app-card { padding: 16px 12px; }
    .app-card-icon { width: 80px; height: 80px; border-radius: 20px; }
    .talk-thumb-wrap { border-radius: 20px 20px 0 0; }
    .oss-grid { grid-template-columns: 1fr; }
}