:root {
    color-scheme: dark;
    --primary-font: 'Klee One', sans-serif;
    --secondary-font: 'Courier New', 'Courier', monospace;
    --page-bg: #000000;
    --page-text: #fafafa;
    --panel-bg: rgba(10, 10, 10, 0.8);
    --surface-bg: rgba(0, 0, 0, 0.4);
    --surface-bg-strong: rgba(10, 10, 10, 0.5);
    --border-color: #1a1a1a;
    --border-strong: #333333;
    --muted-text: #666666;
    --soft-text: #333333;
    --brand-line: #444444;
    --accent: rgba(255, 255, 255, 0.08);
    --accent-strong: rgba(255, 255, 255, 0.12);
    --logo-orbital: rgba(255, 255, 255, 0.06);
    --orbital: rgba(255, 255, 255, 0.03);
    --card-glow: rgba(255, 255, 255, 0.04);
    --diagonals: rgba(255, 255, 255, 0.015);
    --spotlight-1: rgba(40, 40, 40, 0.15);
    --spotlight-2: rgba(50, 50, 50, 0.08);
    --spotlight-3: rgba(50, 50, 50, 0.06);
    --coord-marker: rgba(255, 255, 255, 0.08);
    --deco-bracket: rgba(255, 255, 255, 0.05);
    --particle: rgba(255, 255, 255, 0.5);
}

/* --- LÓGICA DE MODO CLARO (Idéntico a Furigana) --- */
:root[data-theme="light"] {
    color-scheme: light;
    --page-bg: #f0f2f5;
    --page-text: #1a1a1a;
    --panel-bg: rgba(255, 255, 255, 0.7);
    --surface-bg: rgba(255, 255, 255, 0.4);
    --surface-bg-strong: rgba(255, 255, 255, 0.5);
    --border-color: #d1d5db;
    --border-strong: #9ca3af;
    --muted-text: #6b7280;
    --soft-text: #9ca3af;
    --brand-line: #d1d5db;
    --accent: rgba(0, 0, 0, 0.3);
    --accent-strong: rgba(0, 0, 0, 0.5);
    --logo-orbital: rgba(0, 0, 0, 0.1);
    --orbital: rgba(0, 0, 0, 0.2);
    --card-glow: rgba(0, 0, 0, 0.1);
    --diagonals: rgba(0, 0, 0, 0.04);
    --spotlight-1: rgba(250, 250, 250, 0.15);
    --spotlight-2: rgba(240, 240, 240, 0.08);
    --spotlight-3: rgba(240, 240, 240, 0.06);
    --coord-marker: rgba(0, 0, 0, 0.6);
    --deco-bracket: rgba(0, 0, 0, 0.1);
    --particle: rgba(0, 0, 0, 0.7);
}

/* Forzar interacción en el logo */
#logo-theme-toggle {
    pointer-events: auto !important;
    cursor: pointer !important;
    z-index: 100;
    user-select: none;
}

/* Esto permite que el click "atraviese" las órbitas y llegue al contenedor padre */
#logo-theme-toggle * {
    pointer-events: none;
}

#logo-theme-toggle:active {
    transform: scale(0.95);
}

/* Ajustes de visibilidad para elementos decorativos en modo claro */
:root[data-theme="light"] .orbital, 
:root[data-theme="light"] .hex-pattern, 
:root[data-theme="light"] .coord-marker,
:root[data-theme="light"] .vertical-text,
:root[data-theme="light"] .scan-line {
    opacity: 0.3;
    filter: brightness(0.2);
}

:root[data-theme="light"] .logo-orbit {
    border-color: var(--logo-orbital);
}

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

html {
    font-family: var(--primary-font);
    background-color: var(--page-bg);
    color: var(--page-text);
}

html[data-font="secondary"] {
    font-family: var(--secondary-font);
}

body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    position: relative;
    overflow-x: hidden;
}

@view-transition {
    navigation: auto;
}

::view-transition-old(root),
::view-transition-new(root) {
    animation-duration: 320ms;
    animation-timing-function: cubic-bezier(0.22, 1, 0.36, 1);
}

::view-transition-old(furigana-shell),
::view-transition-new(furigana-shell) {
    animation-duration: 380ms;
    animation-timing-function: cubic-bezier(0.22, 1, 0.36, 1);
}

/* Patron diagonal de lineas */
.bg-diagonals {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: repeating-linear-gradient(
        45deg,
        transparent,
        transparent 120px,
        var(--diagonals) 120px,
        var(--diagonals) 121px
    );
    pointer-events: none;
    z-index: 0;
}

/* Gradiente central fuerte */
.bg-spotlight {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse 80% 50% at 50% 50%, var(--spotlight-1), transparent 70%),
        radial-gradient(ellipse 60% 80% at 80% 20%, var(--spotlight-2), transparent 50%),
        radial-gradient(ellipse 50% 60% at 20% 80%, var(--spotlight-3), transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* Orbitales giratorios */
.orbital {
    position: fixed;
    border: 1px solid var(--orbital);
    border-radius: 50%;
    pointer-events: none;
    z-index: 0;
}

.orbital::before {
    content: '';
    position: absolute;
    width: 6px;
    height: 6px;
    background: var(--accent-strong);
    border-radius: 50%;
    top: 0;
    left: 50%;
    transform: translateX(-50%) translateY(-50%);
}

.orbital-1 {
    width: 600px;
    height: 600px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: orbit-rotate 60s linear infinite;
}

.orbital-2 {
    width: 450px;
    height: 450px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: orbit-rotate 45s linear infinite reverse;
}

.orbital-3 {
    width: 300px;
    height: 300px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border-style: dashed;
    animation: orbit-rotate 30s linear infinite;
}

@keyframes orbit-rotate {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

/* Hexagonos sutiles */
.hex-pattern {
    position: fixed;
    pointer-events: none;
    z-index: 0;
    opacity: 0.7;
    color: var(--accent); 
}

.hex-pattern svg {
    width: 100%;
    height: 100%;
}

.hex-1 {
    width: 180px;
    height: 180px;
    top: 8%;
    left: 5%;
}

.hex-2 {
    width: 120px;
    height: 120px;
    bottom: 12%;
    right: 8%;
}

.hex-3 {
    width: 80px;
    height: 80px;
    top: 20%;
    right: 15%;
}

/* Linea de escaneo animada */
.scan-line {
    position: fixed;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(255, 255, 255, 0.03) 20%, 
        rgba(255, 255, 255, 0.06) 50%, 
        rgba(255, 255, 255, 0.03) 80%, 
        transparent 100%
    );
    pointer-events: none;
    z-index: 0;
    animation: scan 8s ease-in-out infinite;
}

@keyframes scan {
    0%, 100% { top: 10%; opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { top: 90%; opacity: 0; }
}

/* Texto vertical decorativo */
.vertical-text {
    position: fixed;
    writing-mode: vertical-rl;
    font-size: 0.65rem;
    letter-spacing: 0.3em;
    color: var(--coord-marker);
    pointer-events: none;
    z-index: 0;
    text-transform: uppercase;
}

.vertical-text-left {
    left: 3%;
    top: 50%;
    transform: translateY(-50%);
}

.vertical-text-right {
    right: 3%;
    top: 50%;
    transform: translateY(-50%) rotate(180deg);
}

/* Marcadores de coordenadas */
.coord-marker {
    position: fixed;
    font-family: monospace;
    font-size: 0.55rem;
    color: var(--coord-marker);
    pointer-events: none;
    z-index: 0;
    display: flex;
    align-items: center;
    gap: 4px;
}

.coord-marker::before {
    content: '';
    width: 4px;
    height: 4px;
    border: 1px solid var(--accent);
    border-radius: 1px;
}

.coord-1 { top: 15%; left: 8%; }
.coord-2 { top: 25%; right: 10%; }
.coord-3 { bottom: 20%; left: 12%; }
.coord-4 { bottom: 30%; right: 6%; }

/* Circulos concentricos de esquina */
.corner-rings {
    position: fixed;
    pointer-events: none;
    z-index: 0;
}

.corner-rings::before,
.corner-rings::after {
    content: '';
    position: absolute;
    border: 1px solid rgba(255, 255, 255, 0.025);
    border-radius: 50%;
}

.corner-rings::before {
    width: 200px;
    height: 200px;
}

.corner-rings::after {
    width: 140px;
    height: 140px;
    top: 30px;
    left: 30px;
}

.corner-rings-tl {
    top: -100px;
    left: -100px;
}

.corner-rings-br {
    bottom: -100px;
    right: -100px;
}

.corner-rings-br::before,
.corner-rings-br::after {
    right: 0;
    bottom: 0;
    left: auto;
    top: auto;
}

.corner-rings-br::after {
    right: 30px;
    bottom: 30px;
}

/* Brackets decorativos */
.deco-bracket {
    position: fixed;
    width: 30px;
    height: 30px;
    pointer-events: none;
    z-index: 0;
}

.deco-bracket::before,
.deco-bracket::after {
    content: '';
    position: absolute;
    background: var(--deco-bracket);
}

.deco-bracket-tl::before { width: 20px; height: 1px; top: 0; left: 0; }
.deco-bracket-tl::after { width: 1px; height: 20px; top: 0; left: 0; }

.deco-bracket-tr::before { width: 20px; height: 1px; top: 0; right: 0; }
.deco-bracket-tr::after { width: 1px; height: 20px; top: 0; right: 0; }

.deco-bracket-bl::before { width: 20px; height: 1px; bottom: 0; left: 0; }
.deco-bracket-bl::after { width: 1px; height: 20px; bottom: 0; left: 0; }

.deco-bracket-br::before { width: 20px; height: 1px; bottom: 0; right: 0; }
.deco-bracket-br::after { width: 1px; height: 20px; bottom: 0; right: 0; }

.deco-bracket-tl { top: 60px; left: 60px; }
.deco-bracket-tr { top: 60px; right: 60px; }
.deco-bracket-bl { bottom: 60px; left: 60px; }
.deco-bracket-br { bottom: 60px; right: 60px; }

/* Particulas flotantes */
.particle {
    position: fixed;
    width: 2px;
    height: 2px;
    background: var(--particle);
    border-radius: 50%;
    pointer-events: none;
    z-index: 0;
    animation: float 10s ease-in-out infinite;
}

.particle-1 { top: 30%; left: 20%; animation-delay: 0s; }
.particle-2 { top: 60%; left: 15%; animation-delay: 2s; }
.particle-3 { top: 45%; right: 18%; animation-delay: 4s; }
.particle-4 { top: 70%; right: 25%; animation-delay: 6s; }
.particle-5 { top: 20%; right: 30%; animation-delay: 8s; }

@keyframes float {
    0%, 100% { transform: translateY(0) scale(1); opacity: 0.1; }
    50% { transform: translateY(-20px) scale(1.5); opacity: 0.2; }
}

/* ==========================================
   CONTENIDO PRINCIPAL
   ========================================== */

main {
    width: 100%;
    max-width: 720px;
    position: relative;
    z-index: 1;
}

/* Hero */
.hero {
    text-align: center;
    margin-bottom: 4rem;
    padding-bottom: 2.5rem;
    position: relative;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 1px;
    background: var(--brand-line);
}

/* Logo con orbitales internos */
.logo-container {
    position: relative;
    width: 120px;
    height: 120px;
    margin: 0 auto 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-orbit {
    position: absolute;
    border: 1px solid var(--logo-orbital);
    border-radius: 50%;
}

.logo-orbit:nth-child(1) {
    width: 100%;
    height: 100%;
    animation: logo-spin 20s linear infinite;
}

.logo-orbit:nth-child(2) {
    width: 80%;
    height: 80%;
    border-style: dashed;
    animation: logo-spin 15s linear infinite reverse;
}

.logo-orbit:nth-child(3) {
    width: 60%;
    height: 60%;
    animation: logo-spin 10s linear infinite;
}

.logo-orbit::after {
    content: '';
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--accent);
    border-radius: 50%;
    top: -2px;
    left: 50%;
    transform: translateX(-50%);
}

@keyframes logo-spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.logo-char {
    font-size: 2.5rem;
    font-weight: 300;
    color: var(--page-text);
    z-index: 1;
}

h1 {
    margin-bottom: 0.5rem;
}

.title-jp {
    font-size: 2.25rem;
    font-weight: 500;
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: 0.8rem;
    color: var(--muted-text);
    letter-spacing: 0.1em;
}

/* Tools Grid */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    grid-auto-rows: 180px;
    gap: 1rem;
}

/* Tool Card */
.tool-card {
    position: relative;
    padding: 1.75rem;
    background: var(--panel-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    text-decoration: none;
    color: inherit;
    transition: all 0.25s ease;
    overflow: hidden;
}

.tool-card-furigana {
    view-transition-name: furigana-shell;
}

.tool-card:not(.tool-card-coming) {
    cursor: pointer;
}

.tool-card:not(.tool-card-coming):not(.tool-card-dictionary):hover {
    transform: translateY(-2px);
    border-color: var(--border-strong);
}

.tool-card:not(.tool-card-coming):not(.tool-card-dictionary):hover .card-glow {
    opacity: 1;
}

.tool-card:not(.tool-card-dictionary) {
    opacity: 0;
    transform: scale(0.95) translateY(-8px);
    transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

.tool-card.is-showing {
    opacity: 1;
    transform: scale(1) translateY(0);
}

#btn-dictionary {
    height: 180px;
}

#btn-dictionary.is-expanded:hover {
    border-color: var(--border-strong);
    transform: translateY(-2px);
}

#btn-dictionary.is-expanded:hover .card-content h3 {
    color: #9ca3af;
}

/* Glow */
.card-glow {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 80px;
    background: radial-gradient(ellipse 80% 100% at 50% -20%, var(--card-glow), transparent);
    opacity: 0;
    transition: opacity 0.25s ease;
    pointer-events: none;
}

/* Corner decorations */
.card-corner {
    position: absolute;
    width: 10px;
    height: 10px;
    border: 1px solid var(--border-color);
    pointer-events: none;
    transition: border-color 0.25s ease;
}

.card-corner-tl { top: -1px; left: -1px; border-right: none; border-bottom: none; border-top-left-radius: 3px; }
.card-corner-tr { top: -1px; right: -1px; border-left: none; border-bottom: none; border-top-right-radius: 3px; }
.card-corner-bl { bottom: -1px; left: -1px; border-right: none; border-top: none; border-bottom-left-radius: 3px; }
.card-corner-br { bottom: -1px; right: -1px; border-left: none; border-top: none; border-bottom-right-radius: 3px; }

.tool-card:not(.tool-card-coming):not(.tool-card-dictionary):hover .card-corner {
    border-color: var(--border-strong);
}

/* Card header */
.card-header {
    margin-bottom: 1rem;
}

.card-icon {
    font-size: 1.75rem;
    font-weight: 300;
    color: var(--page-text);
}

/* Card content */
.card-content {
    margin-bottom: 1.25rem;
}

.card-content h3 {
    font-size: 1rem;
    font-weight: 500;
    color: var(--page-text);
    transition: color 0.25s ease;
}

.tool-card:not(.tool-card-coming):not(.tool-card-dictionary):hover .card-content h3 {
    color: #9ca3af;
}

/* Card footer */
.card-footer {
    display: flex;
    justify-content: flex-end;
}

.card-arrow {
    color: var(--muted-text);
    transition: all 0.25s ease;
}

.tool-card:not(.tool-card-coming):not(.tool-card-dictionary):hover .card-arrow {
    color: var(--page-text);
    transform: translate(2px, -2px);
}

.card-arrow.locked {
    color: var(--soft-text);
    font-size: 0.9rem;
}

/* Coming soon */
.tool-card-coming {
    opacity: 0.4;
    cursor: default;
}

.tool-card-coming .card-icon,
.tool-card-coming .card-content h3 {
    color: var(--muted-text);
}

/* Dictionary toggle button */
.tool-card-dictionary {
    cursor: pointer;
    transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

/* transform manejado por JS con getBoundingClientRect() */

.tool-card-dictionary:hover:not(.is-expanded) {
    transform: translateY(-2px);
    border-color: var(--border-strong);
}

.tool-card-dictionary:hover:not(.is-expanded) .card-glow {
    opacity: 1;
}

.tool-card-dictionary:hover:not(.is-expanded) .card-corner {
    border-color: var(--border-strong);
}

.tool-card-dictionary:hover:not(.is-expanded) .card-content h3 {
    color: #9ca3af;
}

.tool-card-dictionary:hover:not(.is-expanded) .card-arrow {
    color: var(--page-text);
    transform: translate(2px, -2px);
}

/* Dictionary options */
.dict-option {
    position: relative;
    padding: 1.75rem;
    background: var(--panel-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    text-decoration: none;
    color: inherit;
    overflow: hidden;
    opacity: 0;
    transform: scale(0.95) translateY(-8px);
    transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
    pointer-events: none;
}

.dict-option.is-showing {
    opacity: 1;
    transform: scale(1) translateY(0);
    pointer-events: auto;
}

.dict-option:hover {
    transform: translateY(-2px);
    border-color: var(--border-strong);
}

.dict-option:hover .card-glow {
    opacity: 1;
}

.dict-option:hover .card-corner {
    border-color: var(--border-strong);
}

.dict-option:hover .card-content h3 {
    color: #9ca3af;
}

.dict-option:hover .card-arrow {
    color: var(--page-text);
    transform: translate(2px, -2px);
}

.dict-option .card-glow {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 80px;
    background: radial-gradient(ellipse 80% 100% at 50% -20%, var(--card-glow), transparent);
    opacity: 0;
    transition: opacity 0.25s ease;
    pointer-events: none;
}

.dict-option .card-corner {
    position: absolute;
    width: 10px;
    height: 10px;
    border: 1px solid var(--border-color);
    pointer-events: none;
    transition: border-color 0.25s ease;
}

.dict-option .card-corner-tl { top: -1px; left: -1px; border-right: none; border-bottom: none; border-top-left-radius: 3px; }
.dict-option .card-corner-tr { top: -1px; right: -1px; border-left: none; border-bottom: none; border-top-right-radius: 3px; }
.dict-option .card-corner-bl { bottom: -1px; left: -1px; border-right: none; border-top: none; border-bottom-left-radius: 3px; }
.dict-option .card-corner-br { bottom: -1px; right: -1px; border-left: none; border-top: none; border-bottom-right-radius: 3px; }

.dict-option .card-icon {
    font-size: 1.75rem;
    font-weight: 300;
    color: var(--page-text);
}

.dict-option .card-content h3 {
    font-size: 1rem;
    font-weight: 500;
    color: var(--page-text);
    transition: color 0.25s ease;
}

.dict-option .card-arrow {
    color: var(--muted-text);
    transition: all 0.25s ease;
}

/* Animación idéntica a la de las otras tarjetas */
@keyframes entradaUniforme {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(-8px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.animar-entrada {
    /* Usando la duración de 0.3s y el bezier de las otras cartas */
    animation: entradaUniforme 0.3s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

#btn-dictionary {
    height: 180px;
    opacity: 0; /* Empieza invisible igual que los demás */
}

/* Los otros dos botones ya tienen su lógica, no los tocamos */

/* Dictionary arrow rotation */
.dict-arrow {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.dict-arrow svg {
    /* 0.8s para que cubra todo el desplazamiento y el delay del JS */
    transition: transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
    display: block;
}

#btn-dictionary.is-expanded .dict-arrow svg {
    transform: rotate(180deg);
}

/* Footer */
footer {
    margin-top: 4rem;
    text-align: center;
}

.footer-line {
    width: 100%;
    max-width: 200px;
    height: 1px;
    margin: 0 auto;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}



/* ==========================================
   LANGUAGE TOGGLE BUTTON
   ========================================== */

.language-toggle {
    position: fixed;
    top: 2rem;
    right: 2rem;
    z-index: 50;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--panel-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--page-text);
    cursor: pointer;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    transition: all 0.25s ease;
}

.language-toggle:hover {
    transform: translateY(-2px);
    border-color: var(--border-strong);
    background: var(--surface-bg-strong);
}

.language-toggle:active {
    transform: translateY(0);
}

.language-toggle .lang-icon {
    display: inline-block;
    width: 16px;
    height: 16px;
    filter: invert(0);
    transition: transform 0.25s ease;
}

:root:not([data-theme="light"]) .language-toggle .lang-icon {
    filter: invert(1) brightness(2);
}

.language-toggle:hover .lang-icon {
    transform: rotate(20deg);
}

.language-toggle .lang-code {
    font-family: var(--secondary-font);
    letter-spacing: 0.1em;
}

/* Bottom-right quick links */
.corner-links {
    position: fixed;
    right: 2rem;
    bottom: 2rem;
    z-index: 50;
    display: flex;
    align-items: center;
    gap: 0.2rem;
}

.corner-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 2.2rem;
    background: var(--panel-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--page-text);
    text-decoration: none;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    transition: all 0.25s ease;
}

.corner-link:hover {
    transform: translateY(-2px);
    border-color: var(--border-strong);
    background: var(--surface-bg-strong);
}

.corner-link:active {
    transform: translateY(0);
}

.corner-link-long {
    padding: 0 1rem;
    min-width: 5.2rem;
}

.corner-link-square {
    width: 2.2rem;
    padding: 0;
    font-size: 1rem;
}

/* Responsive */
@media (max-width: 640px) {
    .language-toggle {
        top: 1rem;
        right: 1rem;
        padding: 0.4rem 0.8rem;
        font-size: 0.7rem;
    }

    .language-toggle .lang-icon {
        width: 12px;
        height: 12px;
    }

    .corner-links {
        right: 1rem;
        bottom: 1rem;
        gap: 0.16rem;
    }

    .corner-link {
        height: 2.05rem;
        font-size: 0.7rem;
    }

    .corner-link-long {
        min-width: 4.8rem;
        padding: 0 0.8rem;
    }

    .corner-link-square {
        width: 2.05rem;
        font-size: 0.92rem;
    }
}

/* Hotspot to reveal corner links when hidden */
.corner-hotspot {
    position: fixed;
    right: 2rem;
    bottom: 2rem;
    width: 2.4rem;
    height: 2.4rem;
    z-index: 49;
    background: transparent;
    pointer-events: auto;
}
.corner-hotspot-visible {
    /* optional visual cue when visible; keep transparent by default */
}

.corner-links-hidden {
    opacity: 0;
    transform: translateY(6px);
    pointer-events: none;
    transition: opacity 220ms ease, transform 220ms ease;
}

.corner-links {
    transition: opacity 220ms ease, transform 220ms ease;
}

@media (max-width: 480px) {
    .language-toggle {
        padding: 0.4rem 0.6rem;
        gap: 0.3rem;
    }

    .language-toggle .lang-code {
        display: none;
    }
}

@media (max-width: 640px) {
    body {
        padding: 1.5rem;
    }

    .orbital,
    .hex-pattern,
    .vertical-text,
    .coord-marker,
    .corner-rings,
    .deco-bracket,
    .particle,
    .scan-line {
        display: none;
    }

    .bg-diagonals {
        background: repeating-linear-gradient(
            45deg,
            transparent,
            transparent 80px,
            var(--diagonals) 80px,
            var(--diagonals) 81px
        );
    }

    .logo-container {
        width: 90px;
        height: 90px;
    }

    .logo-char {
        font-size: 2rem;
    }

    .title-jp {
        font-size: 1.75rem;
    }

    .tools-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero {
        margin-bottom: 3rem;
    }

    .tool-card {
        padding: 1.25rem;
    }
}