/* ============================================================
   intview — Shared Design System
   Extracted from notes; used by index.html & notes/index.html
   ============================================================ */

/* ===== Design Tokens ===== */
:root {
    --bg: #FCFCFB;
    --text: #1f2328;
    --muted: #59636e;
    --bd: #d1d9e0;
    --code: #f6f8fa;
    --link: #0969da;
    --warn: #9a6700;
    --sans: 'Lora', Georgia, serif;
    --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    --radius: 6px;
    --header-h: 64px;
    --gutter: clamp(28px, 4.5vw, 64px);
}

:root[data-theme=dark] {
    --bg: #0d1117;
    --text: #e6edf3;
    --muted: #9198a1;
    --bd: #3d444d;
    --code: #161b22;
    --link: #4493f8;
    --warn: #d29922;
}

:root { color-scheme: light; }
:root[data-theme=dark] { color-scheme: dark; }

/* ===== Base Reset ===== */
*, *::before, *::after {
    box-sizing: border-box;
    scrollbar-width: thin;
    scrollbar-color: var(--bd) transparent;
}

html {
    scroll-behavior: smooth;
    height: 100%;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font: 15px/1.6 var(--sans);
    letter-spacing: -0.005em;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

[data-barba="wrapper"] {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    flex: 1 0 auto;
    width: 100%;
}

.barba-page,
[data-barba="container"] {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    flex: 1 0 auto;
    width: 100%;
}

main {
    flex: 1 0 auto;
}

/* ===== Horizontal Slide Animations (Home <-> Notes) ===== */
.slide-out-left {
    transform: translateX(-100vw) !important;
    opacity: 0 !important;
    transition: transform 0.38s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.32s ease !important;
    pointer-events: none;
}

.slide-out-right {
    transform: translateX(100vw) !important;
    opacity: 0 !important;
    transition: transform 0.38s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.32s ease !important;
    pointer-events: none;
}

.slide-in-from-right {
    animation: animSlideInRight 0.38s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes animSlideInRight {
    0% {
        transform: translateX(100vw);
        opacity: 0;
    }
    100% {
        transform: translateX(0);
        opacity: 1;
    }
}

.slide-in-from-left {
    animation: animSlideInLeft 0.38s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes animSlideInLeft {
    0% {
        transform: translateX(-100vw);
        opacity: 0;
    }
    100% {
        transform: translateX(0);
        opacity: 1;
    }
}

strong, b { font-weight: 500; }

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--bd); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--muted); }

a { color: var(--link); }
p { margin: 0 0 0.75em; }
ul, ol { margin: 0 0 0.75em; padding-left: 1.5em; }
li { margin-bottom: 0.2em; }
hr { border: 0; border-top: 1px solid var(--bd); margin: 0; }

:focus-visible { outline: 2px solid var(--link); outline-offset: 2px; }

/* ===== Skip Link (Accessibility) ===== */
.skip { position: absolute; left: -999px; top: auto; width: 1px; height: 1px; overflow: hidden; }
.skip:focus {
    left: 8px; top: 8px; width: auto; height: auto;
    background: var(--bg); color: var(--text);
    padding: 6px 12px; z-index: 999;
    border-radius: var(--radius);
    border: 1px solid var(--bd);
    text-decoration: none; font-weight: 500;
}

/* ===== Header ===== */
header {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--header-h);
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 0 var(--gutter);
    background: var(--bg);
    border-bottom: 1px solid var(--bd);
    z-index: 20;
}

#scroll-progress {
    position: absolute;
    bottom: -1px; left: 0;
    height: 2.5px;
    width: 0%;
    background: var(--link);
    z-index: 30;
    pointer-events: none;
    transition: width 0.04s ease-out;
}

.logo-link {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
    flex-shrink: 0;
    color: var(--text);
}

.logo-link img {
    height: 48px;
    width: auto;
    display: block;
    /* PNG has white bg — invert dark ink → white in dark mode, keeps blue hues */
    transition: filter 0.2s;
}

:root[data-theme=dark] .logo-link img {
    filter: invert(1) hue-rotate(180deg);
}

.logo-link svg {
    height: 48px;
    width: auto;
    display: block;
    color: var(--text);
}

header .grow { flex: 1; }

/* ===== Nav ===== */
.nav-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--muted);
    text-decoration: none;
    transition: color 0.15s;
    white-space: nowrap;
    padding: 5px 8px;
    border-radius: 4px;
}

.nav-link:hover { color: var(--text); }

/* ===== Buttons ===== */
.btn {
    font: inherit;
    font-size: 14px;
    font-weight: 500;
    color: var(--text);
    background: var(--bg);
    border: 1px solid var(--bd);
    border-radius: var(--radius);
    padding: 0 16px;
    height: 38px;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s, color 0.15s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
}

.btn:hover {
    background: var(--code);
    border-color: var(--muted);
    color: var(--text);
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 42px;
    padding: 0 22px;
    font: inherit;
    font-size: 15px;
    font-weight: 500;
    color: #fff;
    background: var(--link);
    border: 1px solid var(--link);
    border-radius: var(--radius);
    text-decoration: none;
    cursor: pointer;
    transition: opacity 0.15s;
    white-space: nowrap;
}

.btn-primary:hover {
    color: #fff;
    opacity: 0.9;
}

/* ===== Theme Toggle ===== */
.theme-wrap { position: relative; flex-shrink: 0; }

.theme-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px; height: 36px;
    padding: 0;
    color: var(--text);
    background: var(--bg);
    border: 1px solid var(--bd);
    border-radius: var(--radius);
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s;
}

.theme-btn:hover { background: var(--code); border-color: var(--muted); }
.theme-btn svg { width: 18px; height: 18px; display: block; }

.theme-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    width: 158px;
    background: var(--bg);
    border: 1px solid var(--bd);
    border-radius: var(--radius);
    padding: 6px;
    z-index: 50;
    display: flex;
    flex-direction: column;
    gap: 2px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}

:root[data-theme=dark] .theme-dropdown {
    box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}

.theme-dropdown[hidden] { display: none; }

.theme-option {
    display: flex;
    align-items: center;
    width: 100%;
    padding: 8px 10px;
    border: 0;
    background: none;
    color: var(--text);
    font: inherit;
    font-size: 14px;
    font-weight: 500;
    border-radius: 4px;
    cursor: pointer;
    text-align: left;
    gap: 10px;
    transition: background 0.15s;
}

.theme-option:hover { background: var(--code); }

.theme-opt-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px; height: 18px;
    flex-shrink: 0;
}

.theme-opt-icon.sun  { color: #f59e0b; }
.theme-opt-icon.moon { color: #0ea5e9; }
.theme-opt-icon.system { color: var(--muted); }
.theme-opt-text { flex: 1; }

.theme-opt-check {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 16px; height: 16px;
    opacity: 0;
    color: var(--link);
    margin-left: auto;
    flex-shrink: 0;
}

.theme-option.active .theme-opt-check { opacity: 1; }

/* ===== Cards ===== */
.card {
    display: flex;
    flex-direction: column;
    border: 1px solid var(--bd);
    border-radius: 8px;
    padding: 20px;
    background: var(--bg);
    text-decoration: none;
    color: var(--text);
    transition: border-color 0.15s;
}

.card:hover {
    border-color: var(--link);
    color: var(--text);
}

.card-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background: var(--code);
    border: 1px solid var(--bd);
    color: var(--link);
    margin-bottom: 14px;
}

.card-icon svg {
    width: 19px;
    height: 19px;
    display: block;
}

.card-title {
    font-size: 16px;
    font-weight: 600;
    margin: 0 0 7px;
    color: var(--text);
    line-height: 1.3;
}

.card-desc {
    font-size: 13.5px;
    color: var(--muted);
    line-height: 1.55;
    flex: 1;
    margin: 0 0 16px;
}

.card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: auto;
    gap: 8px;
}

.tag {
    display: inline-flex;
    align-items: center;
    font-size: 11px;
    font-weight: 500;
    font-family: var(--mono);
    letter-spacing: 0.03em;
    color: var(--muted);
    background: var(--code);
    border: 1px solid var(--bd);
    border-radius: 4px;
    padding: 2px 7px;
}

.card-arrow {
    font-size: 13px;
    color: var(--link);
    font-weight: 500;
    transition: transform 0.15s;
    white-space: nowrap;
}

.card:hover .card-arrow { transform: translateX(4px); }

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
}

/* ===== Section Layout ===== */
.section {
    max-width: 900px;
    margin: 0 auto;
    padding: 56px 24px;
}

.section-label {
    font-size: 11.5px;
    font-weight: 600;
    font-family: var(--mono);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--link);
    margin-bottom: 10px;
    display: block;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0 0 10px;
    line-height: 1.3;
}

.section-sub {
    color: var(--muted);
    margin: 0 0 32px;
    font-size: 15px;
    line-height: 1.6;
    max-width: 520px;
}

/* ===== Footer ===== */
footer {
    padding: 20px var(--gutter);
    font-size: 13.5px;
    color: var(--muted);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
    border-top: 1px solid var(--bd);
    background: transparent;
    margin-top: auto;
}

footer a { color: var(--muted); text-decoration: none; transition: color 0.15s; }
footer a:hover { color: var(--text); }
footer .footer-left strong { color: var(--text); font-weight: 600; }
footer .footer-right { font-size: 13px; color: var(--muted); }

/* ===== Responsive ===== */
@media (max-width: 960px) {
    header { padding: 0 var(--gutter); gap: 10px; }
    .section { padding: 40px 16px; }
}

@media (max-width: 600px) {
    :root { --header-h: 56px; }
    .logo-link img, .logo-link svg { height: 38px; }
    .cards-grid { grid-template-columns: 1fr; }
    .section-title { font-size: 1.25rem; }
    .btn-primary { height: 40px; font-size: 14px; padding: 0 18px; }
    footer { flex-direction: column; text-align: center; gap: 8px; padding: 18px var(--gutter); }
}