/* ================================================================
   Apple Design System — Tokens (single source of truth)
   ================================================================ */
:root {
    /* Surface */
    --canvas: #ffffff;
    --canvas-parchment: #f5f5f7;
    --surface-pearl: #fafafc;
    --surface-tile-1: #272729;
    --surface-tile-2: #2a2a2c;
    --surface-tile-3: #252527;
    --surface-black: #000000;
    --surface-chip-translucent: rgba(210, 210, 215, 0.64);

    /* Ink & body */
    --ink: #1d1d1f;
    --body: #1d1d1f;
    --on-dark: #ffffff;
    --body-muted: #cccccc;
    --ink-muted-80: #333333;
    --ink-muted-48: #7a7a7a;

    /* Hairlines */
    --divider-soft: rgba(0, 0, 0, 0.04);
    --hairline: #e0e0e0;
    --hairline-on-dark: rgba(255, 255, 255, 0.16);

    /* Brand accent — single blue */
    --primary: #0066cc;
    --primary-focus: #0071e3;
    --primary-on-dark: #2997ff;

    /* Radius */
    --rounded-none: 0;
    --rounded-xs: 5px;
    --rounded-sm: 8px;
    --rounded-md: 11px;
    --rounded-lg: 18px;
    --rounded-pill: 9999px;
    --rounded-full: 9999px;

    /* Spacing */
    --space-xxs: 4px;
    --space-xs: 8px;
    --space-sm: 12px;
    --space-md: 17px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-xxl: 48px;
    --space-section: 80px;

    /* Single product shadow — used only on profile photo */
    --shadow-product: 0 10px 30px rgba(0, 0, 0, 0.22);
}

/* ================================================================
   Base
   ================================================================ */
* { box-sizing: border-box; }

html {
    scroll-behavior: smooth;
    background: var(--canvas);
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
        "Inter", "Pretendard Variable", Pretendard, system-ui,
        "Noto Sans KR", sans-serif;
    background: var(--canvas);
    color: var(--ink);
    font-size: 17px;
    font-weight: 400;
    line-height: 1.47;
    letter-spacing: -0.022em;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

::selection {
    background: rgba(0, 102, 204, 0.18);
    color: var(--ink);
}

a {
    color: var(--primary);
    text-decoration: none;
}
a:hover { text-decoration: underline; }

img { max-width: 100%; display: block; }

/* Section IDs scroll target offset for sticky nav */
section[id], header[id] { scroll-margin-top: 56px; }

/* ================================================================
   Apple typography ladder
   ================================================================ */
.t-hero-display {
    font-size: 56px;
    font-weight: 600;
    line-height: 1.07;
    letter-spacing: -0.005em;
}
.t-display-lg {
    font-size: 40px;
    font-weight: 600;
    line-height: 1.1;
    letter-spacing: -0.005em;
}
.t-display-md {
    font-size: 34px;
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.011em;
}
.t-lead {
    font-size: 24px;
    font-weight: 400;
    line-height: 1.33;
    letter-spacing: 0.009em;
}
.t-tagline {
    font-size: 21px;
    font-weight: 600;
    line-height: 1.19;
    letter-spacing: 0.011em;
}
.t-body-strong {
    font-size: 17px;
    font-weight: 600;
    line-height: 1.24;
    letter-spacing: -0.022em;
}
.t-body {
    font-size: 17px;
    font-weight: 400;
    line-height: 1.47;
    letter-spacing: -0.022em;
}
.t-caption {
    font-size: 14px;
    font-weight: 400;
    line-height: 1.43;
    letter-spacing: -0.016em;
}
.t-caption-strong {
    font-size: 14px;
    font-weight: 600;
    line-height: 1.29;
    letter-spacing: -0.016em;
}
.t-fine-print {
    font-size: 12px;
    font-weight: 400;
    line-height: 1.5;
    letter-spacing: -0.01em;
}

/* Display-xl alias used by project bands — override SpaceX D-DIN style */
.t-display-xl {
    font-family: inherit;
    font-size: 40px;
    font-weight: 600;
    line-height: 1.1;
    letter-spacing: -0.005em;
    text-transform: none;
}
@media (max-width: 734px) {
    .t-display-xl { font-size: 34px; }
}

/* Legacy alias rewrites (Notion classes mapped to Apple) */
.t-h1 {
    font-size: 40px;
    font-weight: 600;
    line-height: 1.1;
    letter-spacing: -0.005em;
    color: inherit;
    margin: 0;
}
@media (max-width: 734px) { .t-h1 { font-size: 32px; } }
.t-h2 {
    font-size: 34px;
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.011em;
    color: inherit;
    margin: 0;
}
@media (max-width: 734px) { .t-h2 { font-size: 28px; } }
.t-subtitle {
    font-size: 17px;
    font-weight: 400;
    line-height: 1.47;
    letter-spacing: -0.022em;
}
.t-body-lg {
    font-size: 21px;
    font-weight: 400;
    line-height: 1.38;
    letter-spacing: 0.011em;
}
.t-micro-cap {
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    line-height: 1;
}

/* ================================================================
   Tile system — full-bleed alternating sections
   ================================================================ */
section, header, footer { padding: 0; }

.tile {
    width: 100%;
    padding: 80px 0;
    position: relative;
}
@media (max-width: 734px) {
    .tile { padding: 48px 0; }
}

.tile-light { background: var(--canvas); color: var(--ink); }
.tile-parchment { background: var(--canvas-parchment); color: var(--ink); }
.tile-dark { background: var(--surface-tile-1); color: var(--on-dark); }
.tile-dark-2 { background: var(--surface-tile-2); color: var(--on-dark); }
.tile-dark-3 { background: var(--surface-tile-3); color: var(--on-dark); }

/* Dark tile link inversion */
.tile-dark a,
.tile-dark-2 a,
.tile-dark-3 a,
.project-band a {
    color: var(--primary-on-dark);
}

/* Tile container (text-heavy content) */
.tile-container {
    max-width: 980px;
    margin: 0 auto;
    padding: 0 22px;
}
.tile-container-wide {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 22px;
}

/* Bootstrap container override — bring inside Apple 1100px guard */
.container {
    max-width: 1100px !important;
    padding-left: 22px !important;
    padding-right: 22px !important;
}

/* Tile header (eyebrow + h2 + sub) */
.tile-header {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 64px;
    padding: 0 22px;
}
@media (max-width: 734px) { .tile-header { margin-bottom: 40px; } }

.tile-header.left {
    text-align: left;
    margin-left: 22px;
    margin-right: auto;
}

.tile-header .eyebrow {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--ink-muted-80);
    letter-spacing: 0;
    margin-bottom: 12px;
}
.tile-dark .tile-header .eyebrow,
.tile-dark-2 .tile-header .eyebrow,
.tile-dark-3 .tile-header .eyebrow {
    color: var(--body-muted);
}

.tile-header h2 {
    font-size: 40px;
    font-weight: 600;
    line-height: 1.1;
    letter-spacing: -0.005em;
    margin: 0 0 12px;
    color: inherit;
}
@media (max-width: 734px) { .tile-header h2 { font-size: 32px; } }

.tile-header p {
    font-size: 17px;
    line-height: 1.47;
    letter-spacing: -0.022em;
    color: var(--ink-muted-80);
    margin: 0;
}
.tile-dark .tile-header p,
.tile-dark-2 .tile-header p,
.tile-dark-3 .tile-header p {
    color: var(--body-muted);
}

/* ================================================================
   Global nav (Apple black bar)
   ================================================================ */
.global-nav {
    background: var(--surface-black);
    color: var(--on-dark);
    position: sticky;
    top: 0;
    z-index: 1000;
    height: 44px;
}
.global-nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 44px;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 22px;
}
.global-nav .nav-brand {
    font-size: 14px;
    font-weight: 600;
    color: var(--on-dark);
    text-decoration: none;
    letter-spacing: -0.016em;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.global-nav .nav-brand-icon {
    width: 24px;
    height: 24px;
    object-fit: contain;
    flex: 0 0 auto;
}
.global-nav .nav-brand:hover { text-decoration: none; }

.global-nav .nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
}
.global-nav .nav-link-item {
    color: var(--on-dark);
    opacity: 0.85;
    font-size: 12px;
    font-weight: 400;
    line-height: 1;
    letter-spacing: -0.01em;
    text-decoration: none;
    padding: 8px 14px;
}
.global-nav .nav-link-item:hover {
    opacity: 1;
    text-decoration: none;
}

.global-nav .nav-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}
.global-nav .nav-mobile-toggle {
    display: none;
    background: transparent;
    border: 0;
    color: var(--on-dark);
    cursor: pointer;
    padding: 6px 10px;
    font-size: 16px;
}
.language-switch {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 2px;
    width: 58px;
    height: 28px;
    padding: 2px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--hairline-on-dark);
    border-radius: var(--rounded-pill);
    color: var(--on-dark);
    font-size: 10px;
    font-weight: 600;
    line-height: 1;
    letter-spacing: 0.02em;
    text-decoration: none;
    cursor: pointer;
    transition: transform 150ms ease, border-color 150ms ease, background 150ms ease;
}
.language-switch:hover {
    color: var(--on-dark);
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.32);
    text-decoration: none;
}
.language-switch:active { transform: scale(0.95); }
.language-switch:focus-visible {
    outline: 2px solid var(--primary-focus);
    outline-offset: 2px;
}
.language-switch-option {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border-radius: var(--rounded-full);
    color: rgba(255, 255, 255, 0.62);
}
.language-switch-option.is-active {
    color: var(--on-dark);
    background: var(--primary-on-dark);
}
.language-switch.is-en .language-switch-option.is-active {
    color: var(--ink);
    background: var(--canvas-parchment);
}

@media (max-width: 833px) {
    .global-nav .nav-links { display: none; }
    .global-nav .nav-mobile-toggle { display: inline-flex; }
    .global-nav .nav-actions .btn-utility-dark,
    .global-nav .nav-actions .btn-utility-blue { display: none; }
}

/* ================================================================
   Buttons (Apple grammar)
   ================================================================ */
.btn-pill-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    background: var(--primary);
    color: var(--on-dark);
    border: 0;
    border-radius: var(--rounded-pill);
    font-size: 17px;
    font-weight: 400;
    line-height: 1;
    letter-spacing: -0.022em;
    padding: 12px 22px;
    text-decoration: none;
    cursor: pointer;
    transition: transform 150ms ease;
}
.btn-pill-primary:hover { color: var(--on-dark); text-decoration: none; }
.btn-pill-primary:active { transform: scale(0.95); }
.btn-pill-primary:focus-visible {
    outline: 2px solid var(--primary-focus);
    outline-offset: 2px;
}

.btn-pill-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    background: transparent;
    color: var(--primary);
    border: 1px solid var(--primary);
    border-radius: var(--rounded-pill);
    font-size: 17px;
    font-weight: 400;
    line-height: 1;
    letter-spacing: -0.022em;
    padding: 11px 22px;
    text-decoration: none;
    cursor: pointer;
    transition: transform 150ms ease;
}
.btn-pill-secondary:hover { color: var(--primary); text-decoration: none; }
.btn-pill-secondary:active { transform: scale(0.95); }

.btn-utility-dark {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--ink);
    color: var(--on-dark);
    border: 0;
    border-radius: var(--rounded-sm);
    font-size: 14px;
    font-weight: 400;
    line-height: 1;
    letter-spacing: -0.016em;
    padding: 8px 15px;
    text-decoration: none;
    cursor: pointer;
}
.btn-utility-dark:hover { color: var(--on-dark); text-decoration: none; }
.btn-utility-dark:active { transform: scale(0.95); }

.btn-utility-blue {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--primary);
    color: var(--on-dark);
    border: 0;
    border-radius: var(--rounded-sm);
    font-size: 14px;
    font-weight: 400;
    line-height: 1;
    letter-spacing: -0.016em;
    padding: 8px 15px;
    text-decoration: none;
    cursor: pointer;
}
.btn-utility-blue:hover { color: var(--on-dark); text-decoration: none; }
.btn-utility-blue:active { transform: scale(0.95); }

/* Legacy alias overrides — every old Notion-button becomes the Apple pill */
.btn-primary-notion {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--primary);
    color: var(--on-dark);
    border: 0;
    border-radius: var(--rounded-pill);
    font-size: 17px;
    font-weight: 400;
    line-height: 1;
    letter-spacing: -0.022em;
    padding: 12px 22px;
    text-decoration: none;
    cursor: pointer;
    transition: transform 150ms ease;
}
.btn-primary-notion:hover { color: var(--on-dark); text-decoration: none; }
.btn-primary-notion:active { transform: scale(0.95); }

.btn-secondary-notion {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: transparent;
    color: var(--primary);
    border: 1px solid var(--primary);
    border-radius: var(--rounded-pill);
    font-size: 17px;
    font-weight: 400;
    line-height: 1;
    letter-spacing: -0.022em;
    padding: 11px 22px;
    text-decoration: none;
    cursor: pointer;
}
.btn-secondary-notion:hover { color: var(--primary); text-decoration: none; background: transparent; }
.btn-secondary-notion:active { transform: scale(0.95); }

/* Mobile drawer */
.mobile-drawer {
    display: none;
    position: fixed;
    top: 44px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--surface-black);
    z-index: 999;
    padding: 16px 22px;
    overflow-y: auto;
}
.mobile-drawer.open { display: block; }
.mobile-drawer a {
    display: block;
    padding: 14px 0;
    color: var(--on-dark);
    font-size: 17px;
    font-weight: 400;
    text-decoration: none;
    letter-spacing: -0.022em;
    border-bottom: 1px solid var(--hairline-on-dark);
}
.mobile-drawer a:last-child { border-bottom: none; }

/* ================================================================
   Hero (product-tile-light variant)
   ================================================================ */
.hero {
    background: var(--canvas);
    color: var(--ink);
    padding: 80px 0 80px;
}
@media (max-width: 734px) {
    .hero { padding: 48px 0; }
}

.hero-grid {
    display: grid;
    grid-template-columns: minmax(180px, 280px) 1fr;
    gap: 64px;
    align-items: center;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 22px;
}
@media (max-width: 833px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 32px;
        text-align: center;
        justify-items: center;
    }
}

.profile-photo {
    width: 100%;
    max-width: 280px;
    aspect-ratio: 1 / 1;
    object-fit: cover;
    border-radius: 50%;
    border: 0;
    box-shadow: 3px 5px 30px rgba(0, 0, 0, 0.22);
}

.hero-eyebrow {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--ink-muted-80);
    letter-spacing: 0;
    margin-bottom: 14px;
}

.hero h1 {
    font-size: 56px;
    font-weight: 600;
    line-height: 1.07;
    letter-spacing: -0.005em;
    color: var(--ink);
    margin: 0 0 20px;
}
@media (max-width: 1024px) { .hero h1 { font-size: 48px; } }
@media (max-width: 833px) { .hero h1 { font-size: 40px; } }
@media (max-width: 640px) { .hero h1 { font-size: 34px; } }

.hero h1 .name-roman {
    display: inline-block;
    font-size: 0.45em;
    font-weight: 400;
    color: var(--ink-muted-48);
    margin-left: 8px;
    letter-spacing: -0.005em;
}
@media (max-width: 833px) { .hero h1 .name-roman { display: block; margin-left: 0; margin-top: 6px; } }

.hero .tagline {
    font-size: 21px;
    font-weight: 400;
    line-height: 1.42;
    letter-spacing: 0.011em;
    color: var(--ink-muted-80);
    margin: 0 0 28px;
}
.hero .tagline strong {
    font-weight: 600;
    color: var(--ink);
}
.hero .tagline-line { display: block; }
.hero .tagline-subline,
.hero .tagline-subline strong { color: #999999; }
.hero .tagline-line + .tagline-line { margin-top: 4px; }
@media (max-width: 640px) { .hero .tagline { font-size: 17px; } }

.contact-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 18px 24px;
}
@media (max-width: 833px) { .contact-list { justify-content: center; } }

.contact-list li {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--ink-muted-80);
    letter-spacing: -0.016em;
}
.contact-list li i {
    font-size: 14px;
    color: var(--ink-muted-80);
}
.contact-list a {
    color: var(--ink-muted-80);
    text-decoration: none;
}
.contact-list a:hover { color: var(--primary); text-decoration: none; }

/* ================================================================
   About — info-card + timeline (Apple simplified)
   ================================================================ */
.info-card {
    background: var(--canvas);
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-lg);
    padding: 32px;
    height: 100%;
    box-shadow: none;
}
.info-card:hover {
    transform: none;
    box-shadow: none;
}
.info-card h3 {
    font-size: 21px;
    font-weight: 600;
    line-height: 1.19;
    letter-spacing: 0.011em;
    margin: 0 0 24px;
    color: var(--ink);
    display: flex;
    align-items: center;
    gap: 10px;
}
.info-card h3 i {
    color: var(--primary);
    font-size: 22px;
}

.timeline {
    list-style: none;
    padding: 0;
    margin: 0;
}
.timeline li {
    position: relative;
    padding-left: 24px;
    padding-bottom: 24px;
    border-left: 1px solid var(--hairline);
    margin-left: 4px;
}
.timeline li:last-child { padding-bottom: 0; }
.timeline li::before {
    content: "";
    position: absolute;
    left: -5px;
    top: 4px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--primary);
    border: 0;
    box-shadow: none;
}
.timeline .period {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 4px;
    letter-spacing: -0.016em;
}
.timeline .title {
    display: block;
    font-size: 17px;
    font-weight: 600;
    color: var(--ink);
    letter-spacing: -0.022em;
}
.timeline .desc {
    display: block;
    font-size: 14px;
    color: var(--ink-muted-80);
    letter-spacing: -0.016em;
    margin-top: 2px;
}
.timeline .badge-issuer {
    display: inline-block;
    background: var(--canvas-parchment);
    color: var(--ink-muted-80);
    padding: 2px 8px;
    border-radius: var(--rounded-xs);
    font-size: 12px;
    font-weight: 400;
    letter-spacing: -0.01em;
    margin-left: 6px;
}

/* ================================================================
   Strengths — highlight-card (Apple simplified)
   ================================================================ */
.highlight-card,
.highlight-card.success,
.highlight-card.danger {
    background: var(--canvas);
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-lg);
    padding: 32px;
    height: 100%;
    position: relative;
    overflow: hidden;
    box-shadow: none;
    transform: none;
}
.highlight-card:hover { transform: none; box-shadow: none; }
.highlight-card::before { display: none; }

.highlight-card .icon-circle {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    margin-bottom: 20px;
    background: var(--canvas-parchment);
    color: var(--primary);
}
.highlight-card.success .icon-circle,
.highlight-card.danger .icon-circle {
    background: var(--canvas-parchment);
    color: var(--primary);
}

.highlight-card h3,
.highlight-card.success h3,
.highlight-card.danger h3 {
    font-size: 21px;
    font-weight: 600;
    line-height: 1.24;
    letter-spacing: 0.011em;
    margin: 0 0 20px;
    color: var(--ink);
}

.highlight-card ul {
    list-style: none;
    padding: 0;
    margin: 0;
}
.highlight-card ul > li {
    position: relative;
    padding-left: 22px;
    margin-bottom: 18px;
}
.highlight-card ul > li:last-child { margin-bottom: 0; }
.highlight-card ul > li::before,
.highlight-card.success ul > li::before,
.highlight-card.danger ul > li::before {
    content: "\F270";
    font-family: "bootstrap-icons";
    position: absolute;
    left: 0;
    top: 0;
    color: var(--primary);
    font-size: 14px;
}

.highlight-card .lead-line {
    display: block;
    font-size: 17px;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 4px;
    letter-spacing: -0.022em;
}
.highlight-card .sub-line {
    display: block;
    font-size: 14px;
    color: var(--ink-muted-80);
    letter-spacing: -0.016em;
    line-height: 1.47;
    margin-top: 2px;
}
.highlight-card .sub-line strong {
    font-weight: 600;
    color: var(--ink);
}

.sub-line-link {
    color: var(--ink-muted-80);
    text-decoration: none;
    border-bottom: 0;
    transition: color 0.15s ease;
}
.sub-line-link i {
    font-size: 13px;
    margin-left: 4px;
    opacity: 0.7;
    color: var(--primary);
}
.sub-line-link:hover {
    color: var(--primary);
    text-decoration: none;
    border-bottom: 0;
}
.sub-line-link:hover strong { color: var(--primary); }
.highlight-card.danger .sub-line-link:hover,
.highlight-card.danger .sub-line-link:hover strong { color: var(--primary); }

.stack-chip {
    display: inline-block;
    background: var(--canvas-parchment);
    color: var(--ink-muted-80);
    font-family: inherit;
    font-size: 12px;
    font-weight: 400;
    letter-spacing: -0.01em;
    padding: 3px 10px;
    border-radius: var(--rounded-pill);
    margin: 4px 4px 4px 0;
    border: 1px solid var(--hairline);
}

:target.info-card,
:target.highlight-card,
:target.project-band {
    animation: targetPulse 1.6s ease-out;
}
@keyframes targetPulse {
    0% { box-shadow: 0 0 0 0 rgba(0, 102, 204, 0.45); }
    70% { box-shadow: 0 0 0 12px rgba(0, 102, 204, 0); }
    100% { box-shadow: 0 0 0 0 rgba(0, 102, 204, 0); }
}

/* ================================================================
   KDT — stat-card + cohort-card (Apple simplified)
   ================================================================ */
.kdt-section { background: transparent; }

.stat-card {
    background: var(--canvas);
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-lg);
    padding: 32px 24px;
    text-align: center;
    height: 100%;
    position: relative;
    overflow: hidden;
    box-shadow: none;
    transform: none;
}
.stat-card:hover { transform: none; box-shadow: none; }
.stat-card::before { display: none; }

.stat-card .stat-number {
    display: block;
    font-size: 48px;
    font-weight: 600;
    line-height: 1.05;
    letter-spacing: -0.005em;
    color: var(--primary);
    margin-bottom: 8px;
}
.stat-card .stat-label {
    display: block;
    font-size: 17px;
    font-weight: 600;
    color: var(--ink);
    letter-spacing: -0.022em;
    margin-top: 4px;
}
.stat-card .stat-sub {
    display: block;
    font-size: 14px;
    color: var(--ink-muted-80);
    letter-spacing: -0.016em;
    margin-top: 6px;
}

.cohort-card {
    background: var(--canvas);
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-lg);
    overflow: hidden;
    margin-bottom: 24px;
    box-shadow: none;
}
.cohort-header {
    padding: 24px 32px;
    border-bottom: 1px solid var(--hairline);
    background: var(--canvas);
}
.cohort-header h3 {
    font-size: 21px;
    font-weight: 600;
    line-height: 1.19;
    letter-spacing: 0.011em;
    margin: 0 0 12px;
    color: var(--ink);
}
.cohort-header h3 i.text-primary { color: var(--primary) !important; }

.cohort-header .cohort-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 0;
}

/* Override Bootstrap colored badges to Apple chips */
.cohort-meta .badge,
.cohort-meta .badge.bg-primary,
.cohort-meta .badge.bg-success {
    background: var(--canvas-parchment) !important;
    color: var(--ink) !important;
    font-size: 12px !important;
    font-weight: 400 !important;
    letter-spacing: -0.01em !important;
    padding: 5px 12px !important;
    border-radius: var(--rounded-pill) !important;
    border: 1px solid var(--hairline);
}

.cohort-body { padding: 24px 32px 32px; }

details.evidence-details {
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-md);
    background: var(--canvas);
    overflow: hidden;
    transition: border-color 0.2s ease;
    height: 100%;
}
details.evidence-details[open] {
    border-color: var(--hairline);
    background: var(--canvas);
}
details.evidence-details > summary {
    list-style: none;
    cursor: pointer;
    padding: 14px 18px;
    font-size: 14px;
    font-weight: 600;
    color: var(--ink);
    letter-spacing: -0.016em;
    display: flex;
    align-items: center;
    gap: 10px;
    user-select: none;
    border-bottom: 1px solid transparent;
    background: var(--canvas);
    transition: background 0.15s ease;
}
details.evidence-details > summary::-webkit-details-marker { display: none; }
details.evidence-details > summary::before {
    content: "\F285";
    font-family: "bootstrap-icons";
    color: var(--primary);
    font-size: 14px;
    transition: transform 0.2s ease;
}
details.evidence-details[open] > summary::before { transform: rotate(90deg); }
details.evidence-details[open] > summary {
    border-bottom-color: var(--hairline);
    background: var(--canvas-parchment);
}
details.evidence-details > summary:hover { background: var(--canvas-parchment); }
details.evidence-details .evidence-body { padding: 16px; }

.evidence-image-btn {
    position: relative;
    display: block;
    width: 100%;
    padding: 0;
    background: transparent;
    border: 0;
    border-radius: var(--rounded-sm);
    overflow: hidden;
    cursor: zoom-in;
}
.evidence-image-btn img {
    width: 100%;
    height: auto;
    max-height: 260px;
    object-fit: cover;
    object-position: top;
    border-radius: var(--rounded-sm);
    border: 1px solid var(--hairline);
    display: block;
    transition: transform 0.3s ease;
}
.evidence-image-btn:hover img,
.evidence-image-btn:focus-visible img { transform: scale(1.02); }
.evidence-image-btn:focus-visible {
    outline: 2px solid var(--primary-focus);
    outline-offset: 2px;
}
.evidence-zoom-hint {
    position: absolute;
    right: 12px;
    bottom: 12px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    font-size: 12px;
    font-weight: 600;
    color: var(--on-dark);
    background: var(--ink);
    border-radius: var(--rounded-pill);
    opacity: 0;
    transform: translateY(4px);
    transition: opacity 0.2s ease, transform 0.2s ease;
    pointer-events: none;
    letter-spacing: -0.01em;
}
.evidence-image-btn:hover .evidence-zoom-hint,
.evidence-image-btn:focus-visible .evidence-zoom-hint {
    opacity: 1;
    transform: translateY(0);
}
@media (max-width: 575.98px) {
    .evidence-image-btn img { max-height: 220px; }
}

/* Natural-size variant — used by full-width screenshots inside info-cards
   (e.g. satisfaction graph, LinkedIn recommendation). Drops the 260px
   thumbnail cap so the image renders at its column width, keeping the
   same click-to-modal interaction. */
.evidence-image-btn.is-natural {
    border-radius: var(--rounded-sm);
}
.evidence-image-btn.is-natural img {
    max-height: none;
    border-radius: var(--rounded-sm);
}
@media (max-width: 575.98px) {
    .evidence-image-btn.is-natural img { max-height: none; }
}

/* Apple-minimal pull-quote under the LinkedIn recommendation.
   Contains the quote text + an attribution line ("— Kakao Kidsnote Team"). */
.linkedin-quote {
    margin: 16px 0 0;
    padding: 12px 16px;
    border-left: 3px solid var(--primary);
    background: var(--canvas-parchment);
    color: var(--ink-muted-80);
    font-size: 14px;
    line-height: 1.55;
    border-radius: 0 6px 6px 0;
}
.linkedin-quote-text {
    margin: 0;
    font-style: italic;
}
.linkedin-quote-cite {
    display: block;
    margin-top: 8px;
    font-style: normal;
    font-size: 12.5px;
    font-weight: 600;
    letter-spacing: 0.02em;
    color: var(--primary);
}

/* Summary block under the satisfaction graph — two-line layout:
   bold client lineup on top, light-weight manifesto on the bottom. */
.evidence-summary {
    margin: 16px 0 0;
    padding: 12px 16px;
    background: var(--canvas-parchment);
    border-left: 3px solid var(--ink);
    border-radius: 0 6px 6px 0;
    font-size: 14px;
    line-height: 1.55;
    color: var(--ink-muted-80);
}
.evidence-summary-clients {
    display: block;
    font-weight: 600;
    color: var(--ink);
    letter-spacing: -0.01em;
}
.evidence-summary-tag {
    display: block;
    margin-top: 4px;
    font-weight: 400;
}

/* modal-content shrinks to the actual image width so small images
   (e.g. 816px LinkedIn screenshot) don't sit inside a 1140px modal-xl
   box with empty space on the right. The dialog itself stays centered
   via `.modal-dialog-centered`. */
#evidenceModal .modal-content {
    background: transparent;
    border: 0;
    box-shadow: none;
    width: fit-content;
    max-width: 100%;
    margin: 0 auto;
}
#evidenceModal .modal-body {
    position: relative;
    padding: 0;
    text-align: center;
}
#evidenceModal img {
    display: block;
    margin: 0 auto;
    max-width: 100%;
    max-height: 86vh;
    width: auto;
    height: auto;
    border-radius: var(--rounded-sm);
    background: var(--canvas);
}
#evidenceModal .modal-caption {
    margin: 12px 0 0;
    color: rgba(255, 255, 255, 0.92);
    font-size: 14px;
    letter-spacing: -0.016em;
}
#evidenceModal .btn-close {
    position: absolute;
    top: -2.5rem;
    right: 0;
    filter: invert(1) brightness(1.5);
    opacity: 0.9;
}
#evidenceModal .btn-close:hover { opacity: 1; }

/* ================================================================
   Teaching / Career — comparison table (Apple simplified)
   ================================================================ */
.comparison-table {
    background: var(--canvas);
    border: 1px solid var(--hairline);
    border-radius: var(--rounded-lg);
    overflow: hidden;
    max-width: 1100px;
    margin: 0 auto;
}
.comparison-table table {
    width: 100%;
    border-collapse: collapse;
    margin: 0;
}
.comparison-table thead th {
    background: var(--canvas-parchment);
    text-align: left;
    padding: 16px 20px;
    font-size: 12px;
    font-weight: 600;
    color: var(--ink);
    letter-spacing: -0.01em;
    text-transform: uppercase;
    border-bottom: 1px solid var(--hairline);
}
.comparison-table tbody td {
    padding: 16px 20px;
    font-size: 14px;
    color: var(--ink);
    border-bottom: 1px solid var(--hairline);
    vertical-align: middle;
    letter-spacing: -0.016em;
    line-height: 1.47;
}
.comparison-table tbody tr:last-child td { border-bottom: 0; }
.comparison-table tbody tr:hover { background: var(--surface-pearl); }
.comparison-table td strong {
    font-weight: 600;
    color: var(--ink);
}

/* Notion-era badge classes — collapse all to a single Apple chip */
.badge-notion,
.badge-notion.tag-purple,
.badge-notion.tag-orange,
.badge-notion.tag-green {
    display: inline-flex;
    align-items: center;
    background: var(--canvas-parchment);
    color: var(--ink-muted-80);
    border: 1px solid var(--hairline);
    font-size: 12px;
    font-weight: 400;
    letter-spacing: -0.01em;
    padding: 4px 10px;
    border-radius: var(--rounded-pill);
}

/* ================================================================
   Projects — dark photo bands (Apple environment-style)
   ================================================================ */
.project-band {
    position: relative;
    min-height: auto;
    padding: 96px 0;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: var(--surface-tile-1);
    color: var(--on-dark);
}
@media (max-width: 734px) {
    .project-band, .project-band.short { padding: 64px 0; }
}

.project-band.short { padding: 96px 0; }
.project-band.tone-2 { background: var(--surface-tile-2); }
.project-band.tone-3 { background: var(--surface-tile-3); }

.project-band .band-photo {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    filter: brightness(0.45) contrast(1.0) saturate(0.85);
    z-index: 0;
    opacity: 0.7;
}
.project-band .band-photo.lecture {
    background-image: url("assets/band-photo-hana-linux-training.jpeg");
}
.project-band .band-photo.workshop {
    background-image: url("assets/band-photo-koica-srilanka-workshop.jpeg");
}
.project-band .band-photo.overseas {
    background-image: url("assets/band-photo-kpc-sw-global.jpg");
}
/* starfield: drop decorative version, leave tile color */
.project-band .band-photo.starfield {
    background-image: none;
    opacity: 0;
}

.project-content {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 22px;
}

.project-meta-row {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}
.project-num {
    font-family: inherit;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--body-muted);
    display: inline-flex;
    align-items: center;
    gap: 12px;
}
.project-num::before {
    content: "";
    display: inline-block;
    width: 20px;
    height: 1px;
    background: var(--body-muted);
}
.project-org {
    display: inline-flex;
    align-items: center;
    font-family: inherit;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--on-dark);
    border: 1px solid rgba(255, 255, 255, 0.4);
    background: transparent;
    padding: 5px 14px;
    border-radius: var(--rounded-pill);
}

.project-title {
    color: var(--on-dark);
    margin: 0 0 24px;
    max-width: 100%;
    font-family: inherit;
    font-size: 40px;
    font-weight: 600;
    line-height: 1.1;
    letter-spacing: -0.005em;
    text-transform: none;
}
@media (max-width: 734px) { .project-title { font-size: 30px; } }

.project-body {
    max-width: 100%;
}
.project-body p {
    font-size: 17px;
    line-height: 1.47;
    letter-spacing: -0.022em;
    color: var(--body-muted);
    margin: 0 0 20px;
}
.project-body p strong {
    font-weight: 600;
    color: var(--on-dark);
}

.project-body ul {
    list-style: none;
    padding: 0;
    margin: 0 0 24px;
    border-top: 1px solid var(--hairline-on-dark);
}
.project-body ul li {
    padding: 18px 0;
    border-bottom: 1px solid var(--hairline-on-dark);
    color: var(--body-muted);
    font-size: 17px;
    line-height: 1.47;
    letter-spacing: -0.022em;
}
.project-body ul li strong {
    font-weight: 600;
    color: var(--on-dark);
}
.project-body ul ul {
    margin: 10px 0 0;
    padding-left: 0;
    border-top: 1px solid var(--hairline-on-dark);
}
.project-body ul ul li {
    padding: 12px 0;
    padding-left: 24px;
    position: relative;
    font-size: 15px;
    color: var(--body-muted);
    border-bottom: 1px solid var(--hairline-on-dark);
}
.project-body ul ul li:last-child { border-bottom: none; }
.project-body ul ul li::before {
    content: "→";
    position: absolute;
    left: 0;
    top: 12px;
    color: var(--body-muted);
    font-family: inherit;
}

.metric-callout {
    border-top: 1px solid rgba(255, 255, 255, 0.5);
    border-bottom: 1px solid rgba(255, 255, 255, 0.5);
    padding: 24px 0;
    margin: 28px 0;
}
.metric-callout .metric-label {
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--body-muted);
    margin-bottom: 10px;
}
.metric-callout .metric-value {
    font-family: inherit;
    font-size: 34px;
    font-weight: 600;
    line-height: 1.15;
    letter-spacing: -0.011em;
    text-transform: none;
    color: var(--on-dark);
}
@media (max-width: 734px) { .metric-callout .metric-value { font-size: 26px; } }

.project-image {
    width: 100%;
    margin: 28px 0;
    border-radius: var(--rounded-sm);
    overflow: hidden;
    border: 0;
    background: var(--surface-tile-3);
}
.project-image img {
    width: 100%;
    display: block;
}

/* ------------------------------------------------------------------
   Ad-revenue chart (in-page, horizontally scrollable)
   Lives inside a .project-band (dark surface), Chart.js powered.
   ------------------------------------------------------------------ */
.ad-revenue-block {
    margin: 28px 0;
    border-radius: var(--rounded-md);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--hairline-on-dark);
    /* `clip` keeps visual masking but does NOT create a scroll
       container — required so child `position: sticky` can reach
       the viewport on mobile. Falls back to `hidden` in browsers
       without `overflow: clip` support. */
    overflow: hidden;
    overflow: clip;
}
/* Project band that hosts the chart must release its sticky child
   up to the viewport. Opt-in via `.has-chart` so other bands keep
   their default clipping behaviour untouched. */
.project-band.has-chart {
    overflow: hidden;
    overflow: clip;
}
.ad-revenue-header {
    padding: 22px 24px 14px;
    border-bottom: 1px solid var(--hairline-on-dark);
}
.ad-revenue-eyebrow {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--primary-on-dark);
    margin: 0 0 6px;
}
.ad-revenue-title {
    font-family: inherit;
    font-size: 22px;
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.011em;
    color: var(--on-dark);
    margin: 0 0 6px;
}
.ad-revenue-sub {
    font-size: 13px;
    line-height: 1.4;
    letter-spacing: -0.01em;
    color: var(--body-muted);
    margin: 0;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 4px;
}
.ad-revenue-dot {
    display: inline-block;
    width: 9px;
    height: 9px;
    border-radius: 9999px;
    background: var(--primary-on-dark);
    margin: 0 6px;
    transform: translateY(0);
}

/* Outer track — height grows on mobile so sticky scroll-jacking has runway */
.ad-revenue-scroll-track {
    position: relative;
}
.ad-revenue-sticky {
    padding: 18px 0 16px;
}
.ad-revenue-scroller {
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.18) transparent;
}
.ad-revenue-scroller::-webkit-scrollbar { height: 6px; }
.ad-revenue-scroller::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.18);
    border-radius: 9999px;
}
.ad-revenue-scroller::-webkit-scrollbar-track { background: transparent; }

.ad-revenue-canvas-wrap {
    width: 1760px;
    height: 360px;
    padding: 10px 24px 4px;
}
.ad-revenue-canvas-wrap canvas {
    width: 100% !important;
    height: 100% !important;
    display: block;
}
.ad-revenue-hint {
    margin: 10px 24px 4px;
    font-size: 12px;
    letter-spacing: 0.02em;
    color: var(--body-muted);
    text-align: center;
}
.hint-desktop { display: inline; }
.hint-mobile { display: none; }

/* Mobile (≤ 734px) — sticky scroll-jacking: chart sits centered while
   the user vertically scrolls the page, and that scroll drives the
   horizontal position of the chart. */
@media (max-width: 734px) {
    .ad-revenue-scroll-track {
        height: 220vh;
    }
    .ad-revenue-sticky {
        position: sticky;
        top: 50%;
        transform: translateY(-50%);
        padding: 14px 0;
    }
    .ad-revenue-scroller {
        overflow: hidden;
        touch-action: pan-y;
    }
    .ad-revenue-canvas-wrap {
        width: 1280px;
        height: 300px;
        padding: 6px 16px 0;
    }
    .ad-revenue-header { padding: 18px 18px 12px; }
    .ad-revenue-title { font-size: 19px; }
    .ad-revenue-sub { font-size: 12px; }
    .ad-revenue-hint { margin: 4px 18px 0; }
    .hint-desktop { display: none; }
    .hint-mobile { display: inline; }
}

.project-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 12px;
    margin: 24px 0;
}
.project-gallery img {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    border-radius: var(--rounded-sm);
    border: 0;
}

.specs-table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    border-top: 1px solid var(--hairline-on-dark);
    border-bottom: 1px solid var(--hairline-on-dark);
}
.specs-table th,
.specs-table td {
    text-align: left;
    padding: 14px 14px;
    border-bottom: 1px solid var(--hairline-on-dark);
    color: var(--body-muted);
    font-size: 14px;
    letter-spacing: -0.016em;
    line-height: 1.47;
}
.specs-table thead th {
    font-family: inherit;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--on-dark);
}
.specs-table tr.highlight-row td,
.specs-table tr.highlight-row th {
    color: var(--on-dark);
}

/* ================================================================
   Contact CTA — light tile w/ centered pill CTAs
   ================================================================ */
.contact-cta-wrap {
    text-align: center;
    max-width: 720px;
    margin: 0 auto;
    padding: 0 22px;
}
.contact-cta-wrap h2 {
    font-size: 40px;
    font-weight: 600;
    line-height: 1.1;
    letter-spacing: -0.005em;
    color: var(--ink);
    margin: 0 0 16px;
}
@media (max-width: 734px) { .contact-cta-wrap h2 { font-size: 32px; } }
.contact-cta-wrap p {
    font-size: 21px;
    font-weight: 400;
    line-height: 1.38;
    letter-spacing: 0.011em;
    color: var(--ink-muted-80);
    max-width: 560px;
    margin: 0 auto 28px;
}
@media (max-width: 734px) { .contact-cta-wrap p { font-size: 17px; } }
.contact-cta-actions {
    display: inline-flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
}

/* ================================================================
   Footer — parchment, dense link columns
   ================================================================ */
.footer-region {
    background: var(--canvas-parchment);
    color: var(--ink-muted-80);
    padding: 48px 0 24px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 32px;
    max-width: 1100px;
    margin: 0 auto 32px;
    padding: 0 22px;
}
@media (max-width: 833px) {
    .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 575.98px) {
    .footer-grid { grid-template-columns: 1fr; }
}
.footer-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
}
.footer-brand .nav-brand-text {
    font-size: 14px;
    font-weight: 600;
    color: var(--ink);
    letter-spacing: -0.016em;
}
.footer-tagline {
    font-size: 12px;
    line-height: 1.5;
    color: var(--ink-muted-80);
    letter-spacing: -0.01em;
    max-width: 280px;
    margin: 0;
}
.footer-col-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--ink);
    letter-spacing: -0.016em;
    margin-bottom: 8px;
}
.footer-link {
    display: block;
    font-size: 12px;
    line-height: 2.4;
    color: var(--ink-muted-80);
    letter-spacing: -0.01em;
    text-decoration: none;
    padding: 0;
}
.footer-link:hover {
    color: var(--ink);
    text-decoration: underline;
}
.footer-bottom {
    border-top: 1px solid var(--hairline);
    padding: 20px 22px 0;
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 12px;
    color: var(--ink-muted-48);
    letter-spacing: -0.01em;
}
.footer-bottom .copyright {
    color: var(--ink-muted-48);
    font-size: 12px;
}

/* ================================================================
   Print
   ================================================================ */
@media print {
    body { background: #ffffff; }
    .global-nav, .mobile-drawer, .footer-region { display: none !important; }
    .tile, .hero { padding: 1.5rem 0 !important; }
    .tile-dark, .tile-dark-2, .tile-dark-3, .project-band {
        background: #ffffff !important;
        color: var(--ink) !important;
        min-height: auto !important;
        padding: 1.5rem 0 !important;
    }
    .band-photo { display: none !important; }
    .project-title, .project-body p, .project-body ul li,
    .project-body p strong, .project-body ul li strong,
    .metric-callout .metric-label, .metric-callout .metric-value,
    .project-num, .project-org, .specs-table th, .specs-table td {
        color: var(--ink) !important;
    }
    .project-org { border-color: var(--ink) !important; }
    .info-card, .highlight-card, .cohort-card, .stat-card {
        box-shadow: none !important;
        border: 1px solid var(--hairline);
    }
}