/* ===================================================================
   DIOP RESEARCH — Premium research journal design system
   ISSALABS aesthetic expanded for a daily research publication
   =================================================================== */

/* ---- TOKENS ---- */
:root,
[data-theme="dark"] {
    --bg: #0e0d13;
    --bg-raised: #14121a;
    --bg-elevated: #1a1822;
    --text: #f0efe8;
    --text-mid: #9b9890;
    --text-muted: #5a5750;
    --accent: #b7a285;
    --accent-light: #d4c4a8;
    --accent-glow: rgba(183, 162, 133, 0.18);
    --border: rgba(255, 255, 255, 0.06);
    --border-mid: rgba(255, 255, 255, 0.10);
    --surface: rgba(255, 255, 255, 0.02);
    --live-green: #2d7d5a;
    --live-bg: rgba(45, 125, 90, 0.12);
    --terminal-bg: rgba(10, 9, 14, 0.85);
    --terminal-border: rgba(183, 162, 133, 0.12);
    --font-sans: 'Manrope', 'Helvetica Neue', sans-serif;
    --font-serif: 'Space Grotesk', 'Georgia', serif;
    --font-mono: 'DM Mono', 'Courier New', monospace;
    --shell-pad: clamp(20px, 4vw, 56px);
    --content-w: 900px;
    --terminal-w: 420px;
}

[data-theme="light"] {
    --bg: #faf9f7;
    --bg-raised: #ffffff;
    --bg-elevated: #f5f3ef;
    --text: #1a1916;
    --text-mid: #4a4540;
    --text-muted: #8a8278;
    --accent: #9a8565;
    --accent-light: #b7a285;
    --accent-glow: rgba(154, 133, 101, 0.12);
    --border: rgba(0, 0, 0, 0.08);
    --border-mid: rgba(0, 0, 0, 0.12);
    --surface: rgba(0, 0, 0, 0.02);
    --live-green: #2d7d5a;
    --live-bg: rgba(45, 125, 90, 0.08);
    --terminal-bg: rgba(250, 249, 247, 0.92);
    --terminal-border: rgba(154, 133, 101, 0.16);
}

/* ---- RESET ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    min-height: 100vh;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { font: inherit; cursor: pointer; border: none; background: none; }

/* ---- BACKGROUND SYSTEM ---- */
.grain {
    position: fixed; inset: 0; z-index: 1; pointer-events: none;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    background-size: 180px 180px;
}

.bg-glow {
    position: fixed; border-radius: 50%; pointer-events: none;
    will-change: transform;
}
.bg-glow--1 {
    top: -20%; left: -15%; width: 70vw; height: 70vw;
    max-width: 900px; max-height: 900px;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
    filter: blur(60px);
    animation: glowDrift1 18s ease-in-out infinite;
}
.bg-glow--2 {
    bottom: -25%; right: -20%; width: 60vw; height: 60vw;
    max-width: 750px; max-height: 750px;
    background: radial-gradient(circle, rgba(183,162,133,0.08) 0%, transparent 65%);
    filter: blur(70px);
    animation: glowDrift2 22s ease-in-out infinite;
}

@keyframes glowDrift1 {
    0%, 100% { transform: translate(0,0) scale(1); }
    50%  { transform: translate(4vw, 5vh) scale(1.06); }
}
@keyframes glowDrift2 {
    0%, 100% { transform: translate(0,0) scale(1); }
    50%  { transform: translate(-5vw, -4vh) scale(1.08); }
}

.bg-grid {
    position: fixed; inset: 0; z-index: 0; pointer-events: none;
}
.bg-grid::before {
    content: ''; position: absolute; inset: -30%;
    background-image: radial-gradient(circle, var(--border) 1px, transparent 1px);
    background-size: 26px 26px;
    opacity: 0.5;
}

.bg-shape {
    position: fixed; z-index: 2; pointer-events: none;
    opacity: 0; animation: shapeAppear 1.8s ease forwards;
}
.bg-shape--1 {
    top: 8%; right: 4%; width: 300px; height: 300px;
    border: 1.5px solid var(--accent-glow);
    border-radius: 50%;
    box-shadow: 0 0 50px var(--accent-glow);
    animation-delay: 0.3s, 2s;
    animation-name: shapeAppear, floatA;
    animation-duration: 1.8s, 14s;
    animation-timing-function: ease, ease-in-out;
    animation-iteration-count: 1, infinite;
    animation-fill-mode: forwards, none;
}
.bg-shape--2 {
    bottom: 18%; left: 2%; width: 180px; height: 180px;
    border: 1.5px solid rgba(183,162,133,0.10);
    transform: rotate(45deg);
    animation-delay: 0.8s, 3s;
    animation-name: shapeAppear, floatB;
    animation-duration: 1.8s, 18s;
    animation-timing-function: ease, ease-in-out;
    animation-iteration-count: 1, infinite;
    animation-fill-mode: forwards, none;
}

@keyframes floatA {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50%  { transform: translateY(-18px) rotate(3deg); }
}
@keyframes floatB {
    0%, 100% { transform: translateY(0) rotate(45deg); }
    50%  { transform: translateY(-12px) rotate(48deg); }
}
@keyframes shapeAppear {
    from { opacity: 0; transform: scale(0.5); }
    to   { opacity: 1; }
}

/* ---- CURSOR ORB ---- */
.cursor-orb {
    position: fixed; width: 520px; height: 520px; border-radius: 50%;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 68%);
    pointer-events: none; z-index: 4;
    filter: blur(2px);
    will-change: transform;
    transform: translate(-1000px, -1000px);
}

[data-theme="light"] .cursor-orb { display: none; }

/* ---- SCROLL PROGRESS ---- */
.scroll-progress {
    position: fixed; top: 0; left: 0; height: 2px;
    background: linear-gradient(to right, var(--accent), rgba(183,162,133,0.3));
    z-index: 200; width: 0%;
    transition: width 100ms linear;
    pointer-events: none;
}

/* ---- CANVAS ---- */
#particle-canvas {
    position: fixed; inset: 0; z-index: 3; pointer-events: none;
    opacity: 0.6;
}
[data-theme="light"] #particle-canvas { opacity: 0.3; }

/* ---- NAV ---- */
.nav {
    position: sticky; top: 0; z-index: 100;
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 var(--shell-pad); height: 80px;
    background: var(--bg-raised);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    transition: box-shadow 300ms ease;
}
.nav--scrolled { box-shadow: 0 2px 24px rgba(0,0,0,0.15); }

.nav__brand { display: inline-flex; align-items: center; }
.nav__logo {
    height: clamp(40px, 3.5vw, 48px);
    width: auto; display: block;
}

.nav__links { display: flex; align-items: center; gap: 32px; }
.nav__link {
    font-size: 0.875rem; font-weight: 600; color: var(--text-mid);
    transition: color 150ms ease;
    letter-spacing: 0.01em;
}
.nav__link:hover { color: var(--text); }
.nav__link--active { color: var(--accent); }

.nav__theme-btn {
    width: 36px; height: 36px;
    display: inline-flex; align-items: center; justify-content: center;
    border-radius: 8px;
    color: var(--text-muted);
    transition: color 150ms ease, background 150ms ease;
    border: 1px solid transparent;
}
.nav__theme-btn:hover {
    color: var(--text);
    background: var(--surface);
    border-color: var(--border);
}
.nav__theme-btn svg {
    display: block;
    stroke: currentColor;
    flex-shrink: 0;
}
.theme--sun { display: none; }
.theme--moon { display: inline-flex; }
[data-theme="light"] .theme--sun { display: inline-flex; }
[data-theme="light"] .theme--moon { display: none; }
[data-theme="light"] .theme--moon { display: none; }

/* ---- HERO ---- */
.hero {
    position: relative; z-index: 10;
    padding: clamp(48px, 8vw, 96px) 0 clamp(40px, 6vw, 72px);
}
.hero__inner {
    width: min(1100px, calc(100% - var(--shell-pad) * 2));
    margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(0, 0.88fr) minmax(320px, 1.12fr);
    align-items: center; gap: clamp(32px, 5vw, 64px);
}

.hero__label {
    font-family: var(--font-mono);
    font-size: 0.65rem; letter-spacing: 0.14em;
    text-transform: uppercase; color: var(--text-muted);
    margin-bottom: 20px;
}

.hero__title {
    font-family: var(--font-serif);
    font-size: clamp(2.2rem, 4.5vw, 3.6rem);
    font-weight: 700; line-height: 1.08;
    letter-spacing: -0.02em;
    color: var(--text);
    margin-bottom: 24px;
}

.hero__subtitle {
    font-size: 1rem; line-height: 1.72;
    color: var(--text-mid);
    max-width: 520px;
    margin-bottom: 32px;
}

.hero__meta {
    display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
}

.hero__pill {
    display: inline-flex; align-items: center; gap: 7px;
    font-family: var(--font-mono); font-size: 0.72rem;
    color: var(--text-muted);
    padding: 6px 14px; border-radius: 20px;
    background: var(--surface);
    border: 1px solid var(--border);
    letter-spacing: 0.02em;
}

.hero__pill-dot {
    width: 6px; height: 6px; border-radius: 50%;
    background: var(--live-green);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50%  { opacity: 0.5; transform: scale(0.8); }
}

/* ---- TERMINAL ---- */
.hero__terminal {
    width: 100%; max-width: var(--terminal-w);
    align-self: center;
}
.terminal__header {
    display: flex; align-items: center; gap: 8px;
    padding: 14px 16px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-mid);
    border-bottom: none;
    border-radius: 10px 10px 0 0;
}
.terminal__dot {
    width: 10px; height: 10px; border-radius: 50%;
}
.terminal__dot--red { background: #ff5f57; }
.terminal__dot--yellow { background: #febc2e; }
.terminal__dot--green { background: #28c840; }
.terminal__title {
    font-family: var(--font-mono); font-size: 0.7rem;
    color: var(--text-muted); margin-left: 8px;
    letter-spacing: 0.02em;
}

.terminal__body {
    padding: 20px 16px 18px;
    background: var(--terminal-bg);
    border: 1px solid var(--border-mid);
    border-top: none;
    border-radius: 0 0 10px 10px;
    font-family: var(--font-mono); font-size: 0.78rem;
    line-height: 1.8;
}
.terminal__line { display: block; }
.terminal__prompt { color: var(--accent); margin-right: 4px; }
.terminal__text { color: var(--text-mid); }
.terminal__output { color: var(--text-muted); padding-left: 8px; }
.terminal__ok { color: var(--live-green); }
.terminal__cursor {
    display: inline-block;
    animation: blink 1s step-end infinite;
}
@keyframes blink {
    0%, 100% { opacity: 1; }
    50%  { opacity: 0; }
}

/* ---- POSTS SECTION ---- */
.posts-section {
    position: relative; z-index: 10;
    padding: clamp(40px, 6vw, 80px) 0 clamp(40px, 8vw, 100px);
}
.posts-section__inner {
    width: min(800px, calc(100% - var(--shell-pad) * 2));
    margin: 0 auto;
}

.posts-section__header { margin-bottom: 48px; }
.posts-section__title {
    font-family: var(--font-serif);
    font-size: 1.8rem; font-weight: 700;
    letter-spacing: -0.02em; margin-bottom: 8px;
}
.posts-section__subtitle {
    font-size: 0.9rem; color: var(--text-muted);
}

/* ---- POST CARDS ---- */
.posts-grid { display: flex; flex-direction: column; gap: 16px; }

.post-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    transition: background 200ms, border-color 200ms, transform 200ms;
    opacity: 0; transform: translateY(16px);
}
.post-card.visible {
    opacity: 1; transform: translateY(0);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.post-card:hover {
    background: var(--bg-raised);
    border-color: var(--border-mid);
}

.post-card__link {
    display: block; padding: clamp(20px, 3vw, 32px);
}

.post-card__meta {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 10px;
}
.post-card__date {
    font-family: var(--font-mono);
    font-size: 0.72rem; color: var(--text-muted);
    letter-spacing: 0.02em;
}
.post-card__readtime {
    font-family: var(--font-mono);
    font-size: 0.68rem; color: var(--text-muted);
    padding: 2px 8px; border-radius: 4px;
    background: var(--surface);
}

.post-card__title {
    font-family: var(--font-serif);
    font-size: clamp(1.2rem, 2.5vw, 1.5rem);
    font-weight: 700; line-height: 1.25;
    letter-spacing: -0.01em;
    color: var(--text);
    margin-bottom: 10px;
    transition: color 150ms;
}
.post-card:hover .post-card__title { color: var(--accent-light); }

.post-card__excerpt {
    font-size: 0.9rem; line-height: 1.65;
    color: var(--text-mid);
    margin-bottom: 16px;
}

.post-card__tags { display: flex; gap: 8px; flex-wrap: wrap; }
.post-card__tag {
    font-family: var(--font-mono); font-size: 0.65rem;
    color: var(--accent); background: var(--accent-glow);
    padding: 3px 10px; border-radius: 4px;
    letter-spacing: 0.04em; text-transform: lowercase;
}

/* ---- FOOTER ---- */
.footer {
    position: relative; z-index: 10;
    border-top: 1px solid var(--border);
    padding: 40px 0;
}
.footer__inner {
    width: min(800px, calc(100% - var(--shell-pad) * 2));
    margin: 0 auto; text-align: center;
    display: flex; flex-direction: column;
    align-items: center; gap: 20px;
}
.footer__logo {
    height: 28px; width: auto; opacity: 0.6;
    transition: opacity 150ms;
    margin: 0 auto;
}
.footer__logo:hover { opacity: 1; }

.footer__nav {
    display: flex; align-items: center; gap: 12px;
    flex-wrap: wrap; justify-content: center;
}
.footer__nav a {
    font-size: 0.8rem; color: var(--text-muted);
    transition: color 150ms;
    letter-spacing: 0.02em;
}
.footer__nav a:hover { color: var(--text); }
.footer__sep { color: var(--border-mid); font-size: 0.7rem; }

.footer__copy {
    font-family: var(--font-mono);
    font-size: 0.68rem; color: var(--text-muted);
    letter-spacing: 0.02em;
}

/* ---- ARTICLE PAGE ---- */
.article {
    position: relative; z-index: 10;
    padding: clamp(32px, 5vw, 56px) 0 clamp(60px, 8vw, 96px);
}
.article__inner {
    width: min(700px, calc(100% - var(--shell-pad) * 2));
    margin: 0 auto;
}
.article__header { margin-bottom: 48px; padding-bottom: 32px; border-bottom: 1px solid var(--border); }
.article__eyebrow {
    font-family: var(--font-mono); font-size: 0.65rem;
    letter-spacing: 0.14em; text-transform: uppercase;
    color: var(--accent); margin-bottom: 16px;
}
.article__title {
    font-family: var(--font-serif);
    font-size: clamp(1.8rem, 3.5vw, 2.6rem);
    font-weight: 700; line-height: 1.15;
    letter-spacing: -0.02em;
    color: var(--text);
    margin-bottom: 20px;
}
.article__meta-line {
    display: flex; align-items: center; gap: 12px;
    font-family: var(--font-mono); font-size: 0.72rem;
    color: var(--text-muted);
}

.article__body { line-height: 1.78; }
.article__body p {
    margin-bottom: 1.4em;
    font-size: 1.02rem; color: var(--text-mid);
}
.article__body h2 {
    font-family: var(--font-serif);
    font-size: 1.4rem; font-weight: 700;
    color: var(--text); margin: 2.5em 0 0.8em;
    letter-spacing: -0.01em;
}
.article__body blockquote {
    border-left: 2px solid var(--accent);
    padding: 12px 0 12px 24px; margin: 1.5em 0;
    color: var(--text-mid); font-style: italic;
}
.article__body code {
    font-family: var(--font-mono); font-size: 0.85em;
    background: var(--surface); padding: 2px 7px;
    border-radius: 4px; color: var(--accent-light);
}
.article__body ul, .article__body ol {
    margin: 1em 0 1.4em 1.2em; color: var(--text-mid);
}
.article__body li {
    margin-bottom: 0.5em; font-size: 1.02rem;
}
.article__body a {
    color: var(--accent-light);
    border-bottom: 1px solid transparent;
    transition: border-color 150ms;
}
.article__body a:hover { border-bottom-color: var(--accent-light); }

.article__footer {
    margin-top: 64px; padding-top: 24px;
    border-top: 1px solid var(--border);
}
.article-back {
    font-family: var(--font-mono); font-size: 0.8rem;
    color: var(--accent); display: inline-flex;
    align-items: center; gap: 6px;
    transition: opacity 150ms;
}
.article-back:hover { opacity: 0.7; }

/* ---- RESPONSIVE ---- */
@media (max-width: 900px) {
    .hero__inner {
        grid-template-columns: 1fr;
    }
    .hero__terminal { display: none; }
    .hero__subtitle { max-width: 100%; }

    .post-card:hover .post-card__title { color: var(--text); }
    .bg-shape--1, .bg-shape--2 { display: none; }
    .cursor-orb { display: none; }
}

@media (max-width: 600px) {
    .nav__links { gap: 16px; }
    .nav__link { font-size: 0.78rem; }
}

/* ---- UNLAUNCHED / COMING SOON LINKS ---- */
.nav__link--coming {
    color: var(--text-muted) !important;
    cursor: default;
    pointer-events: none;
    opacity: 0.35;
    transition: none;
}
.nav__link--coming:hover {
    color: var(--text-muted) !important;
}

.footer__link--coming {
    cursor: default;
    pointer-events: none;
    color: var(--text-muted) !important;
    opacity: 0.35;
}

/* ---- THEME TOGGLE — SVG-based, premium feel ---- */
.nav__theme-btn {
    width: 36px; height: 36px;
    display: inline-flex; align-items: center; justify-content: center;
    border-radius: 8px;
    color: var(--text-muted);
    transition: color 150ms ease, background 150ms ease;
    border: 1px solid transparent;
}
.nav__theme-btn:hover {
    color: var(--text);
    background: var(--surface);
    border-color: var(--border);
}
.nav__theme-btn svg {
    display: block;
    stroke: currentColor;
    flex-shrink: 0;
}
.theme--sun { display: none; }
.theme--moon { display: inline-flex; }
[data-theme="light"] .theme--sun { display: inline-flex; }
[data-theme="light"] .theme--moon { display: none; }

/* ---- LANGUAGE TOGGLE — segmented control, matches main ISSALABS site ---- */
.lang-toggle {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    padding: 3px;
    border: 1px solid var(--border-muted, rgba(255,255,255,0.06));
    background: var(--surface, rgba(255,255,255,0.02));
    border-radius: 999px;
}
.lang-toggle__btn {
    border: 0;
    border-radius: 999px;
    padding: 0.35rem 0.55rem;
    font-size: 0.68rem;
    line-height: 1;
    letter-spacing: 0.12em;
    font-family: var(--font-sans, inherit);
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition:
        background-color 160ms ease,
        color 160ms ease,
        opacity 160ms ease;
}
.lang-toggle__btn[aria-pressed="true"] {
    background: var(--accent);
    color: var(--text);
}
.lang-toggle__btn:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}
[data-theme="light"] .lang-toggle {
    border-color: rgba(0, 0, 0, 0.12);
    background: rgba(0, 0, 0, 0.02);
}
[data-theme="light"] .lang-toggle__btn {
    color: rgba(26, 25, 22, 0.55);
}
[data-theme="light"] .lang-toggle__btn[aria-pressed="true"] {
    background: var(--accent);
    color: #faf9f7;
}

/* ---- ARTICLE ENGLISH-ONLY NOTICE ---- */
.article-notice {
    font-family: var(--font-mono, monospace);
    font-size: 0.75rem;
    color: var(--text-muted);
    padding: 10px 14px;
    margin-bottom: 24px;
    border-left: 2px solid var(--accent);
    background: var(--surface, rgba(255,255,255,0.02));
    border-radius: 0 6px 6px 0;
}

/* ---- ISSUE 1 FIX: Logo protection on mobile ---- */
.nav__brand {
    flex-shrink: 0;
}
.nav__logo {
    height: clamp(36px, 8vw, 48px);
    width: auto;
    display: block;
    flex-shrink: 0;
    max-width: none;
    object-fit: contain;
}
@media (max-width: 480px) {
    .nav__logo {
        height: clamp(32px, 9vw, 40px);
    }
    .nav__links {
        gap: 12px;
        flex-wrap: nowrap;
    }
    .nav__link {
        font-size: 0.75rem;
        letter-spacing: 0.02em;
    }
}
@media (max-width: 390px) {
    .nav__link {
        font-size: 0.7rem;
    }
    .nav__links {
        gap: 10px;
    }
}