/* =============================================
   Jonathan Allgurén - Portfolio Styles
   Modern & Interactive
   ============================================= */

/* --- Custom Properties --- */
:root {
    --bg: #0b0d11;
    --bg-card: #12151c;
    --bg-card-hover: #181c26;
    --bg-accent: rgba(99, 162, 255, 0.06);
    --text: #e4e8f0;
    --text-dim: #8a92a6;
    --text-faint: #5a6070;
    --accent: #63a2ff;
    --accent-2: #a78bfa;
    --accent-3: #34d399;
    --border: #1e2230;
    --border-hover: #2a3040;
    --gradient-hero: linear-gradient(135deg, #63a2ff 0%, #a78bfa 50%, #34d399 100%);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --mono: 'JetBrains Mono', 'Fira Code', monospace;
    --radius: 12px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Reset --- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 16px; scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.65;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: #8fbfff; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* Scrollbar */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: #2a2f3e; border-radius: 3px; }

/* --- Navigation --- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0 40px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(11, 13, 17, 0.85);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition), background var(--transition);
}
.nav.scrolled {
    border-bottom-color: var(--border);
    background: rgba(11, 13, 17, 0.95);
}
.nav__logo {
    font-size: 1.1rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: var(--gradient-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.nav__links {
    display: flex;
    align-items: center;
    gap: 28px;
}
.nav__link {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-dim);
    letter-spacing: 0.3px;
    position: relative;
    transition: color var(--transition);
}
.nav__link:hover, .nav__link.active { color: var(--text); }
.nav__link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    border-radius: 1px;
    transition: width var(--transition);
}
.nav__link:hover::after, .nav__link.active::after { width: 100%; }

/* Nav links that are detail-only: dimmed in simple mode */
.nav__link--detail {
    opacity: 0.3;
    transition: color var(--transition), opacity 0.4s ease;
}
body.view-detailed .nav__link--detail {
    opacity: 1;
}

.lang-btn {
    padding: 5px 14px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: transparent;
    color: var(--text-dim);
    font-size: 0.75rem;
    font-weight: 600;
    font-family: var(--font);
    cursor: pointer;
    transition: all var(--transition);
}
.lang-btn:hover { border-color: var(--accent); color: var(--accent); }

/* --- Hero Section --- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px 40px 80px;
    position: relative;
    overflow: hidden;
}
.hero__bg {
    position: absolute;
    inset: -10%;
    background:
        radial-gradient(ellipse 60% 50% at 30% 20%, rgba(99, 162, 255, 0.08), transparent),
        radial-gradient(ellipse 50% 45% at 70% 70%, rgba(167, 139, 250, 0.06), transparent),
        radial-gradient(ellipse 45% 40% at 50% 50%, rgba(52, 211, 153, 0.04), transparent);
    animation: heroGlow 10s ease-in-out infinite alternate;
    will-change: transform, opacity;
    transform: translate3d(0, 0, 0);
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
}
@keyframes heroGlow {
    0% { opacity: 0.7; transform: translate3d(0, 0, 0) scale(1); }
    100% { opacity: 1; transform: translate3d(0, 0, 0) scale(1.04); }
}
.hero__content { position: relative; z-index: 1; max-width: 700px; }

/* --- View Toggle (Simpel / Fördjupad) --- */
.view-toggle {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 44px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeUp 0.8s 0.1s forwards;
}
.view-toggle__btn {
    padding: 0;
    border: none;
    background: transparent;
    color: var(--text-faint);
    font-family: var(--font);
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    cursor: pointer;
    transition: all 0.4s ease;
    position: relative;
}
.view-toggle__btn.active {
    background: var(--gradient-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 0.85rem;
}
.view-toggle__btn:not(.active):hover {
    color: var(--text-dim);
}
.view-toggle__divider {
    color: var(--text-faint);
    font-size: 0.8rem;
    font-weight: 300;
    opacity: 0.4;
    user-select: none;
}

.hero__greeting {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent);
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 16px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeUp 0.8s 0.2s forwards;
}
.hero__name {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 900;
    letter-spacing: -1.5px;
    line-height: 1.1;
    background: var(--gradient-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeUp 0.8s 0.4s forwards;
}
.hero__title {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 6px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeUp 0.8s 0.6s forwards;
}
.hero__subtitle {
    font-size: 0.9rem;
    color: var(--text-dim);
    margin-bottom: 36px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeUp 0.8s 0.7s forwards;
}
.hero__cta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border: 1px solid var(--accent);
    border-radius: 8px;
    color: var(--accent);
    font-size: 0.85rem;
    font-weight: 600;
    transition: all var(--transition);
    opacity: 0;
    transform: translateY(20px);
    animation: fadeUp 0.8s 0.9s forwards;
}
.hero__cta:hover {
    background: rgba(99, 162, 255, 0.1);
    color: #8fbfff;
    transform: translateY(-2px);
}
.hero__scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    opacity: 0;
    animation: fadeUp 0.8s 1.2s forwards;
}
.hero__scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--accent), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}
@keyframes scrollPulse {
    0%, 100% { opacity: 0.3; transform: scaleY(0.6); }
    50% { opacity: 1; transform: scaleY(1); }
}

/* --- Fade-up animation --- */
@keyframes fadeUp {
    to { opacity: 1; transform: translateY(0); }
}
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Section Layout --- */
.section {
    padding: 80px 40px;
    max-width: 900px;
    margin: 0 auto;
}
.section--wide {
    max-width: 1100px;
}

/* --- Dual Columns (Education & Experience side-by-side) --- */
.dual-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}
.section__title {
    font-size: 1.6rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    margin-bottom: 8px;
    color: var(--text);
}
.section__title span {
    background: var(--gradient-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.section__line {
    width: 40px;
    height: 3px;
    background: var(--gradient-hero);
    border-radius: 2px;
    margin-bottom: 32px;
}
.section__subtitle {
    font-size: 1.6rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    color: var(--text);
    margin-top: 40px;
    margin-bottom: 8px;
}
.section__subtitle span {
    background: var(--gradient-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* --- Timeline (Education & Experience) --- */
.timeline {
    position: relative;
    padding-left: 32px;
    margin-left: 80px;
}
.timeline::before {
    content: '';
    position: absolute;
    left: 7px;
    top: 8px;
    bottom: 8px;
    width: 1px;
    background: linear-gradient(to bottom, var(--accent), var(--accent-2), var(--border));
}
.timeline-item {
    position: relative;
    padding-bottom: 32px;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
    content: '';
    position: absolute;
    left: -30px;
    top: 6px;
    width: 13px;
    height: 13px;
    border-radius: 50%;
    background: var(--bg);
    border: 2px solid var(--accent);
    z-index: 1;
    transition: all var(--transition);
}
.timeline-item:hover::before {
    background: var(--accent);
    transform: scale(1.3);
}
/* Timeline year/date labels to the left of dots */
.timeline-item[data-year]::after {
    content: attr(data-year);
    position: absolute;
    right: calc(100% + 42px);
    top: 6px;
    font-family: var(--mono);
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--text-faint);
    white-space: nowrap;
    letter-spacing: 0.3px;
    transition: color var(--transition);
}
.timeline-item:hover[data-year]::after {
    color: var(--accent);
}
.timeline-item__header {
    display: flex;
    align-items: baseline;
    gap: 12px;
    flex-wrap: wrap;
}
.timeline-item__title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text);
}
.timeline-item__badge {
    font-size: 0.65rem;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 4px;
    background: rgba(52, 211, 153, 0.12);
    color: var(--accent-3);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.timeline-item__org {
    font-size: 0.85rem;
    color: var(--accent);
    font-weight: 600;
    margin-top: 2px;
}
.timeline-item__location {
    font-size: 0.78rem;
    color: var(--text-faint);
    margin-top: 2px;
}
.timeline-item__desc {
    font-size: 0.85rem;
    color: var(--text-dim);
    margin-top: 8px;
    line-height: 1.7;
}

/* --- Berzeliusskolan Courses --- */
.berzelius-courses__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4px 16px;
    margin-top: 12px;
}
@media (max-width: 768px) {
    .berzelius-courses__grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
    .berzelius-courses__grid { grid-template-columns: 1fr; }
}

/* --- Courses Row Layout (cols + description panel) --- */
.courses-row {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 24px;
    align-items: start;
}
.courses-row__cols {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}
.courses-row__cols--master {
    grid-template-columns: repeat(2, 1fr);
}
.courses-row__desc {
    position: sticky;
    top: 80px;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 12px;
    padding: 20px;
    min-height: 0;
    transform: scale(0.97);
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}
.courses-row__desc--active {
    background: var(--card);
    border-color: var(--accent);
    min-height: 120px;
    transform: scale(1);
    opacity: 1;
}
.course-desc__placeholder {
    display: none;
}
.course-desc__content {
    animation: descFadeIn 0.35s ease both;
}
@keyframes descFadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
}
.courses-hint {
    color: var(--text-faint);
    font-size: 0.82rem;
    font-style: italic;
    margin-top: 4px;
    transition: opacity 0.4s ease, transform 0.4s ease;
}
.courses-hint--hidden {
    opacity: 0;
    transform: translateY(-6px);
    pointer-events: none;
}
.course-desc__code {
    font-family: var(--mono);
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--accent);
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}
.course-desc__name {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 4px;
    line-height: 1.3;
}
.course-desc__hp {
    font-size: 0.7rem;
    color: var(--text-faint);
    margin-bottom: 12px;
}
.course-desc__text {
    font-size: 0.82rem;
    color: var(--text-muted);
    line-height: 1.55;
}
.courses-col__header {
    font-family: var(--mono);
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 1px;
    padding-bottom: 10px;
    margin-bottom: 8px;
    border-bottom: 2px solid var(--accent);
}
.courses-col__header--master {
    color: var(--accent-2);
    border-bottom-color: var(--accent-2);
}
.course-item {
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
    cursor: default;
    transition: background var(--transition);
}
.course-item--clickable {
    cursor: pointer;
}
.course-item--clickable:hover,
.course-item--active {
    background: rgba(99, 162, 255, 0.06);
    border-radius: 4px;
    padding-left: 6px;
    margin-left: -6px;
}
.course-item--active {
    border-left: 2px solid var(--accent);
}
.course-item:last-child { border-bottom: none; }
.course-item__code {
    display: block;
    font-family: var(--mono);
    font-size: 0.6rem;
    color: var(--accent);
    font-weight: 600;
    letter-spacing: 0.3px;
    margin-bottom: 2px;
}
.course-item__name {
    display: block;
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--text);
    line-height: 1.35;
}
.course-item__hp {
    display: block;
    font-size: 0.65rem;
    color: var(--text-faint);
    margin-top: 2px;
}
.course-item--empty {
    border-bottom: none;
}

/* --- About / Photo --- */
.about-grid {
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 40px;
    align-items: start;
}
.about-photo {
    width: 260px;
    height: 320px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--bg-card);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}
.about-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.about-photo__placeholder {
    font-size: 0.8rem;
    color: var(--text-faint);
    text-align: center;
    padding: 20px;
}
.about-text h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text);
    margin-top: 24px;
    margin-bottom: 8px;
}
.about-text h3:first-child { margin-top: 0; }
.about-text p, .about-text ul {
    font-size: 0.88rem;
    color: var(--text-dim);
    line-height: 1.8;
}
.about-text ul {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 8px;
}
.about-text li {
    padding: 7px 16px;
    background: linear-gradient(135deg, var(--bg-accent), rgba(79,195,247,0.06));
    border: 1px solid rgba(79,195,247,0.18);
    border-radius: 20px;
    font-size: 0.78rem;
    color: var(--text-dim);
    font-weight: 500;
    transition: all 0.25s ease;
}
.about-text li:hover {
    background: linear-gradient(135deg, rgba(79,195,247,0.12), rgba(79,195,247,0.08));
    border-color: rgba(79,195,247,0.35);
    color: var(--text);
    transform: translateY(-1px);
}

/* Language list */
.language-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 8px;
    list-style: none;
    padding: 0;
}
.language-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 12px 22px;
    background: linear-gradient(135deg, var(--bg-accent), rgba(79,195,247,0.06));
    border: 1px solid rgba(79,195,247,0.18);
    border-radius: 12px;
    min-width: 110px;
    transition: all 0.25s ease;
}
.language-item:hover {
    border-color: rgba(79,195,247,0.35);
    transform: translateY(-1px);
}
.language-item__name {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text);
}
.language-item__level {
    font-size: 0.72rem;
    color: #4fc3f7;
    font-weight: 500;
    margin-top: 2px;
}

/* --- Contact / Footer --- */
.contact-links {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}
.contact-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-dim);
    font-size: 0.85rem;
    font-weight: 500;
    transition: all var(--transition);
}
.contact-link:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px);
}
.contact-link__icon { font-size: 1.2rem; }

/* Plain contact links (no box) */
.contact-link--plain {
    background: transparent;
    border: none;
    border-radius: 0;
    padding: 8px 0;
    color: var(--text-dim);
    font-size: 0.9rem;
}
.contact-link--plain:hover {
    border-color: transparent;
    color: var(--accent);
    transform: none;
}
.contact-link--img {
    display: inline-flex;
    align-items: center;
}
.contact-link__img {
    height: 28px;
    width: auto;
    opacity: 0.75;
    transition: opacity var(--transition);
}
.contact-link--img:hover .contact-link__img {
    opacity: 1;
}
.contact-links--inline {
    gap: 28px;
}

/* --- World Map --- */
.world-map {
    max-width: 900px;
    margin: 32px auto 48px;
    position: relative;
}
.world-map__svg {
    width: 100%;
    height: auto;
}
.world-map__country {
    fill: var(--bg-card);
    stroke: var(--border);
    stroke-width: 0.5;
    transition: fill var(--transition), opacity var(--transition);
    cursor: default;
}
.world-map__country:hover {
    opacity: 0.8;
}
.world-map__country--visited {
    fill: url(#visitedGradD3) !important;
    stroke: rgba(99, 162, 255, 0.3);
    stroke-width: 0.8;
    filter: drop-shadow(0 0 6px rgba(99, 162, 255, 0.2));
}
.world-map__country--visited:hover {
    opacity: 1;
    filter: drop-shadow(0 0 12px rgba(99, 162, 255, 0.4));
}
.world-map__tooltip {
    position: absolute;
    background: var(--bg-card);
    border: 1px solid var(--border-hover);
    color: var(--text);
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 0.8rem;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s;
    z-index: 10;
    white-space: nowrap;
}
.world-map__tooltip.show {
    opacity: 1;
}

/* --- Section Divider (gradient line + button) --- */
.section-divider {
    display: flex;
    align-items: center;
    gap: 20px;
    max-width: 900px;
    margin: 0 auto;
    padding: 20px 40px;
}
.section-divider__line {
    flex: 1;
    height: 3px;
    border-radius: 2px;
    background: var(--gradient-hero);
}
.section-divider__btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 28px;
    border: none;
    border-radius: 8px;
    background: var(--gradient-hero);
    color: #fff;
    font-family: var(--font);
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.3px;
    cursor: pointer;
    white-space: nowrap;
    transition: transform 0.3s ease, opacity 0.3s ease;
}
.section-divider__btn:hover {
    transform: scale(1.04);
    opacity: 0.9;
}
.section-divider__arrow {
    font-size: 1rem;
    transition: transform 0.4s ease;
}
body.more-open .section-divider__arrow {
    transform: rotate(180deg);
}

/* --- Below Divider (hidden until "Visa mer" is clicked) --- */
.below-divider {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.7s cubic-bezier(0.4, 0, 0.2, 1),
                opacity 0.5s ease;
}
.below-divider.show {
    max-height: 10000px;
    opacity: 1;
    overflow: visible;
}

/* --- More / Mer section --- */
.more-meta {
    font-size: 0.85rem;
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 6px;
}
.more-badge {
    display: inline-block;
    font-size: 0.65rem;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 4px;
    background: rgba(52, 211, 153, 0.12);
    color: var(--accent-3);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 10px;
}
.more-body {
    font-size: 0.88rem;
    color: var(--text-dim);
    line-height: 1.8;
}
.more-link {
    color: var(--accent);
    font-weight: 600;
    font-size: 0.85rem;
    transition: color var(--transition);
}
.more-link:hover {
    color: #8fbfff;
}

.footer {
    text-align: center;
    padding: 40px;
    border-top: 1px solid var(--border);
    margin-top: 40px;
}
.footer__text {
    font-size: 0.75rem;
    color: var(--text-faint);
}

/* --- PDF Download FAB --- */
.pdf-fab {
    position: fixed;
    bottom: 28px;
    right: 28px;
    display: flex;
    align-items: center;
    gap: 6px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-dim);
    padding: 10px 16px;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    text-decoration: none;
    z-index: 1000;
    transition: all var(--transition);
    backdrop-filter: blur(12px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}
.pdf-fab:hover {
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: 0 4px 24px rgba(99, 162, 255, 0.2);
    transform: translateY(-2px);
}
.pdf-fab svg {
    flex-shrink: 0;
}

/* --- View mode transitions --- */
.detail-only {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1),
                opacity 0.4s ease,
                margin 0.4s ease;
    margin-top: 0;
}
body.view-detailed .detail-only {
    max-height: 800px;
    opacity: 1;
    margin-top: 8px;
}

/* Courses section — hint visible in simple, content visible in detailed */
.courses-hint {
    font-size: 0.82rem;
    color: var(--text-faint);
    opacity: 0.5;
    margin-top: 4px;
    transition: opacity 0.4s ease;
}
body.view-detailed .courses-hint {
    opacity: 0;
    height: 0;
    margin: 0;
    overflow: hidden;
}
.courses-detail.detail-only {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    margin-top: 0;
    transition: max-height 0.6s cubic-bezier(0.4, 0, 0.2, 1),
                opacity 0.5s ease,
                margin 0.4s ease;
}
body.view-detailed .courses-detail.detail-only {
    max-height: 5000px;
    opacity: 1;
    margin-top: 16px;
    overflow: visible;
}

/* --- Responsive --- */
@media (max-width: 900px) {
    .dual-columns {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}
@media (max-width: 768px) {
    .nav { padding: 0 20px; }
    .nav__links { gap: 16px; }
    .nav__link { font-size: 0.72rem; }
    .section { padding: 60px 20px; }
    .hero { padding: 100px 20px 60px; }
    .about-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    .about-photo {
        width: 180px;
        height: 220px;
        margin: 0 auto;
    }
    .courses-row { grid-template-columns: 1fr; }
    .courses-row__desc { position: static; margin-top: 16px; }
    .timeline {
        margin-left: 60px;
    }
    .timeline-item[data-year]::after {
        font-size: 0.6rem;
        right: calc(100% + 20px);
    }
}
@media (max-width: 480px) {
    .nav__links .nav__link:nth-child(n+5) { display: none; }
    .timeline {
        margin-left: 0;
    }
    .timeline-item[data-year]::after {
        display: none;
    }
    .courses-row__cols { grid-template-columns: 1fr 1fr; }
    .courses-row__cols--master { grid-template-columns: 1fr; }
}