/* --- Variables & Reset --- */
:root {
    --bg-color: #111111;
    --text-color: #ffffff;
    --color-accent: #ff2a4b;
    --font-heading: 'Syne', sans-serif;
    --font-body: 'Inter', sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: var(--font-body);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    transition: background-color 0.8s ease, color 0.8s ease;
}

/* Dynamic Themes */
body.theme-light { --bg-color: #f4f4f4; --text-color: #050505; }
body.theme-dark  { --bg-color: #111111; --text-color: #ffffff; }
body.theme-accent { --bg-color: #ff2a4b; --text-color: #111111; --color-accent: #111111; }

/* Language — 6 languages */
body.lang-ja :is(.lang-en,.lang-zh,.lang-ko,.lang-es,.lang-fr) { display: none !important; }
body.lang-en :is(.lang-ja,.lang-zh,.lang-ko,.lang-es,.lang-fr) { display: none !important; }
body.lang-zh :is(.lang-ja,.lang-en,.lang-ko,.lang-es,.lang-fr) { display: none !important; }
body.lang-ko :is(.lang-ja,.lang-en,.lang-zh,.lang-es,.lang-fr) { display: none !important; }
body.lang-es :is(.lang-ja,.lang-en,.lang-zh,.lang-ko,.lang-fr) { display: none !important; }
body.lang-fr :is(.lang-ja,.lang-en,.lang-zh,.lang-ko,.lang-es) { display: none !important; }

/* Lang switcher component */
.lang-switcher { display: flex; align-items: center; gap: 6px; font-size: 0.75rem; font-weight: 900; letter-spacing: 0.08em; flex-wrap: wrap; }
.lang-switcher span[data-lang] { cursor: pointer; opacity: 0.35; transition: opacity 0.2s, color 0.2s; white-space: nowrap; }
.lang-switcher span[data-lang]:hover { opacity: 0.8; }
.lang-switcher span[data-lang].active { opacity: 1; color: var(--color-accent); }
.lang-switcher .sep { opacity: 0.2; cursor: default; }

/* --- Navbar --- */
.navbar {
    position: fixed; top: 0; left: 0; width: 100%;
    display: flex; justify-content: space-between; align-items: center;
    padding: 1.6rem 5vw; z-index: 100;
    mix-blend-mode: difference;
    color: white; pointer-events: none;
}
.nav-brand {
    font-weight: 800; font-family: var(--font-heading); font-size: 1.2rem;
    text-transform: uppercase;
}
.nav-meta { pointer-events: auto; font-weight: 600; display: flex; gap: 1rem; }
.lang-toggle { cursor: pointer; opacity: 0.5; transition: 0.3s; }
.lang-toggle:hover { opacity: 1; transform: scale(1.1); }
.lang-toggle.active { opacity: 1; color: var(--color-accent); }

/* --- Panels --- */
.pad-panel {
    min-height: 100vh;
    padding: 18vh 5vw 12vh;
    display: flex; flex-direction: column; justify-content: center;
    position: relative;
    overflow: hidden;
}

/* --- Typography --- */
.huge-title {
    font-family: var(--font-heading);
    font-size: clamp(3rem, 8vw, 9rem);
    font-weight: 800;
    line-height: 0.95;
    letter-spacing: -0.04em;
    text-transform: uppercase;
    margin-bottom: 2rem;
    position: relative; z-index: 2;
    word-break: keep-all;
    overflow-wrap: break-word;
}
.huge-title .accent { color: var(--color-accent); }

.summary-text {
    font-size: clamp(1.1rem, 2vw, 2rem);
    font-weight: 500;
    line-height: 1.5;
    max-width: 900px;
    letter-spacing: -0.01em;
    margin-top: 1rem;
    position: relative; z-index: 2;
}

/* --- Cards --- */
.card-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 3rem;
    position: relative; z-index: 2;
}

.info-card {
    background: rgba(128,128,128,0.08);
    border: 2px solid rgba(128,128,128,0.15);
    border-radius: 16px;
    padding: 2rem;
    transition: all 0.4s cubic-bezier(0.19, 1, 0.22, 1);
    cursor: default;
}
.info-card:hover {
    transform: translateY(-6px);
    border-color: var(--color-accent);
    box-shadow: 0 20px 60px rgba(0,0,0,0.15);
}

.info-card-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    display: block;
    transition: transform 0.3s;
}
.info-card:hover .info-card-icon { transform: scale(1.15) rotate(5deg); }

.info-card h3 {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 0.8rem;
    line-height: 1.2;
}
.info-card p {
    font-size: 0.95rem;
    line-height: 1.7;
    opacity: 0.75;
}

/* Math in cards */
.math-formula {
    display: inline-block;
    font-family: 'Courier New', monospace;
    font-size: 1rem;
    background: rgba(0,0,0,0.15);
    border: 2px solid currentColor;
    padding: 0.6rem 1rem;
    margin-top: 1rem;
    border-radius: 8px;
    letter-spacing: 0.02em;
}

/* --- SVG Decorations --- */
.bg-svg {
    position: absolute; z-index: 1; pointer-events: none; opacity: 0.3;
}
.svg-arrow { top: 15%; right: 8%; width: 35vw; }
.svg-circle { top: 50%; left: 50%; transform: translate(-50%, -50%); width: 70vw; }

@keyframes scribble {
    0% { stroke-dashoffset: 1000; }
    100% { stroke-dashoffset: 0; }
}
.animated-path {
    stroke-dasharray: 1000;
    stroke-dashoffset: 1000;
    animation: scribble 2s ease forwards;
}

/* --- Video --- */
.video-wrap {
    width: 100%; padding-bottom: 56.25%; position: relative;
    border-radius: 20px; overflow: hidden;
    margin: 4rem 0 0; box-shadow: 0 30px 80px rgba(0,0,0,0.4);
    transform: scale(0.97); transition: transform 0.8s;
}
.video-wrap.visible { transform: scale(1); }
.video-wrap iframe {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: none;
}

/* --- CTA Button --- */
.btn-massive {
    display: inline-flex; align-items: center; justify-content: center;
    font-family: var(--font-heading);
    font-size: clamp(1.5rem, 4vw, 4rem);
    font-weight: 800;
    color: var(--bg-color);
    background: var(--text-color);
    text-decoration: none;
    padding: 1.2rem 3rem;
    border-radius: 100px;
    transition: all 0.4s cubic-bezier(0.19, 1, 0.22, 1);
    position: relative; overflow: hidden; cursor: pointer;
}
.btn-massive::after {
    content: '';
    position: absolute; top: 50%; left: 50%;
    transform: translate(-50%, -50%) scale(0);
    width: 150%; padding-top: 150%;
    border-radius: 50%;
    background: var(--color-accent);
    z-index: 0;
    transition: transform 0.6s cubic-bezier(0.19, 1, 0.22, 1);
}
.btn-massive:hover::after { transform: translate(-50%, -50%) scale(1); }
.btn-massive span { position: relative; z-index: 1; transition: color 0.3s; }
.btn-massive:hover span { color: #fff !important; }

/* --- Footer --- */
footer {
    padding: 4rem 5vw;
    font-weight: 700;
    font-size: 1.2rem;
    background: #050505;
    color: #fff;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 2rem;
}

/* --- Scroll Animation --- */
.gsap-reveal {
    clip-path: polygon(0 100%, 100% 100%, 100% 100%, 0 100%);
    opacity: 0;
    transform: translateY(40px);
    transition: clip-path 1.2s cubic-bezier(0.77, 0, 0.175, 1),
                opacity  1.2s cubic-bezier(0.77, 0, 0.175, 1),
                transform 1.2s cubic-bezier(0.77, 0, 0.175, 1);
}
.gsap-reveal.visible {
    clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
    opacity: 1;
    transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .card-row { grid-template-columns: 1fr; }
    .huge-title { font-size: clamp(2.5rem, 12vw, 5rem); }
    footer { font-size: 1rem; flex-direction: column; }
}

/* ============================================================
   UNIFIED NAV EXTENSIONS (portal.html)
   ============================================================ */

/* Allow brand link to be clickable */
.navbar .nav-brand {
    pointer-events: auto;
    color: inherit;
    text-decoration: none;
}

/* Nav links list */
.navbar .nav-links {
    display: flex;
    list-style: none;
    gap: 1.8rem;
    pointer-events: auto;
    align-items: center;
}
.navbar .nav-links a {
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: inherit;
    text-decoration: none;
    opacity: 0.55;
    transition: opacity 0.25s;
    pointer-events: auto;
}
.navbar .nav-links a:hover,
.navbar .nav-links a.active { opacity: 1; }

/* ============================================================
   PARTICLE CANVAS + PAGE TRANSITION (portal.html)
   ============================================================ */

#particle-canvas {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    opacity: 0.35;
}

#page-transition {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: #000;
    transform-origin: bottom center;
    transform: scaleY(0);
    pointer-events: none;
}
#page-transition.leaving {
    animation: ptCurtainDown 0.55s cubic-bezier(0.77,0,0.175,1) forwards;
}
#page-transition.entering {
    transform: scaleY(1);
    transform-origin: top center;
    animation: ptCurtainUp 0.55s cubic-bezier(0.77,0,0.175,1) 0.1s forwards;
}
@keyframes ptCurtainDown {
    from { transform: scaleY(0); transform-origin: bottom center; }
    to   { transform: scaleY(1); transform-origin: bottom center; }
}
@keyframes ptCurtainUp {
    from { transform: scaleY(1); transform-origin: top center; }
    to   { transform: scaleY(0); transform-origin: top center; }
}

/* ============================================================
   CLICKABLE CARDS & BADGES
   ============================================================ */

.info-card.clickable { cursor: pointer; }
.info-card.clickable:hover { border-color: var(--color-accent) !important; }

.click-badge {
    display: inline-block;
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    background: var(--color-accent);
    color: white;
    padding: 2px 8px;
    border-radius: 4px;
    margin-left: 6px;
    vertical-align: middle;
}

/* ============================================================
   MODAL SYSTEM
   ============================================================ */

.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.85);
    z-index: 5000;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(8px);
}
.modal-overlay.active { display: flex; }

.modal-content {
    position: relative;
    background: #1a1a1a;
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 20px;
    padding: 2.5rem;
    width: 90vw;
    max-width: 720px;
    max-height: 85vh;
    overflow-y: auto;
    color: #fff;
}

.close-btn {
    position: absolute;
    top: 1.2rem;
    right: 1.5rem;
    font-size: 1.8rem;
    cursor: pointer;
    opacity: 0.5;
    transition: opacity 0.2s;
    line-height: 1;
    pointer-events: auto;
    background: none;
    border: none;
    color: inherit;
}
.close-btn:hover { opacity: 1; }

.modal-title {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 800;
    margin-bottom: 0.6rem;
}
.modal-desc {
    opacity: 0.65;
    font-size: 0.95rem;
    line-height: 1.65;
    margin-bottom: 1.4rem;
}
.modal-canvas-wrap {
    width: 100%;
    height: 280px;
    background: #0d0d0d;
    border-radius: 12px;
    overflow: hidden;
    position: relative;
}
.sim-canvas {
    display: block;
    width: 100% !important;
    height: 100% !important;
}

/* ============================================================
   PORTAL RESPONSIVE
   ============================================================ */

@media (max-width: 900px) {
    .navbar .nav-links { gap: 1rem; }
    .navbar .nav-links li:nth-child(n+4) { display: none; }
}
@media (max-width: 600px) {
    .navbar .nav-links { display: none; }
}