/* Outfit auto-hospedada (../fonts/) — sin llamadas a CDNs externos.
   unicode-range: el navegador solo descarga los subsets que la página usa. */
@font-face { font-family: 'Outfit'; font-style: normal; font-weight: 300; font-display: swap; src: url('../fonts/outfit-latin-300-normal.woff2') format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: 'Outfit'; font-style: normal; font-weight: 400; font-display: swap; src: url('../fonts/outfit-latin-400-normal.woff2') format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: 'Outfit'; font-style: normal; font-weight: 600; font-display: swap; src: url('../fonts/outfit-latin-600-normal.woff2') format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: 'Outfit'; font-style: normal; font-weight: 800; font-display: swap; src: url('../fonts/outfit-latin-800-normal.woff2') format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: 'Outfit'; font-style: normal; font-weight: 300; font-display: swap; src: url('../fonts/outfit-latin-ext-300-normal.woff2') format('woff2'); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0300-0303, U+0305-0307, U+0309-0310, U+0312-0328, U+032A-0370, U+0377, U+037A-037F, U+0384-038A, U+038C, U+038E-0390, U+03AA-03FF, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; }
@font-face { font-family: 'Outfit'; font-style: normal; font-weight: 400; font-display: swap; src: url('../fonts/outfit-latin-ext-400-normal.woff2') format('woff2'); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0300-0303, U+0305-0307, U+0309-0310, U+0312-0328, U+032A-0370, U+0377, U+037A-037F, U+0384-038A, U+038C, U+038E-0390, U+03AA-03FF, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; }
@font-face { font-family: 'Outfit'; font-style: normal; font-weight: 600; font-display: swap; src: url('../fonts/outfit-latin-ext-600-normal.woff2') format('woff2'); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0300-0303, U+0305-0307, U+0309-0310, U+0312-0328, U+032A-0370, U+0377, U+037A-037F, U+0384-038A, U+038C, U+038E-0390, U+03AA-03FF, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; }
@font-face { font-family: 'Outfit'; font-style: normal; font-weight: 800; font-display: swap; src: url('../fonts/outfit-latin-ext-800-normal.woff2') format('woff2'); unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0300-0303, U+0305-0307, U+0309-0310, U+0312-0328, U+032A-0370, U+0377, U+037A-037F, U+0384-038A, U+038C, U+038E-0390, U+03AA-03FF, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF; }

:root {
    --bg-color: #050510;
    --card-bg: rgba(30, 30, 45, 0.6);
    --primary: #6366f1;
    --secondary: #a855f7;
    --accent: #22d3ee;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --glass-border: rgba(255, 255, 255, 0.1);
    --color-group-1: #4ade80;
    --color-group-2: #60a5fa;
    --color-group-3: #facc15;
}

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

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    overflow-x: hidden;
    min-height: 100vh;
    background-image:
        radial-gradient(circle at 15% 50%, rgba(99, 102, 241, 0.15) 0%, transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(168, 85, 247, 0.15) 0%, transparent 25%);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 4rem;
    animation: fadeInDown 0.8s ease-out;
}

h1 {
    font-size: 3rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--text-main) 0%, var(--primary) 100%);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1rem;
}

.subtitle {
    font-size: 1.25rem;
    color: var(--text-muted);
}

.concepts-grid {
    column-count: 3;
    column-gap: 1.5rem;
}

.concept-card {
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 1.5rem;
    text-decoration: none;
    color: var(--text-main);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    height: 180px;
    break-inside: avoid;
    margin-bottom: 1.5rem;
}

.concept-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
    box-shadow: 0 10px 40px -10px rgba(99, 102, 241, 0.3);
}

.card-number {
    font-size: 0.9rem;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 0.5rem;
    opacity: 0.8;
}

.card-title {
    font-size: 1.5rem;
    font-weight: 600;
    line-height: 1.2;
}

.nav-back {
    display: inline-flex;
    align-items: center;
    color: var(--text-muted);
    text-decoration: none;
    margin-bottom: 2rem;
    font-weight: 600;
    transition: color 0.2s;
}

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

.nav-back svg {
    margin-right: 0.5rem;
}

/* Concept Detail Page Layout */
.concept-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    min-height: 60vh;
}

.concept-info h1 {
    font-size: 3.5rem;
}

.concept-desc {
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--text-muted);
    margin-top: 2rem;
}

.visualization-container {
    background: #0f172a;
    border-radius: 20px;
    border: 1px solid var(--glass-border);
    height: 400px;
    width: 100%;
    position: relative;
    overflow: hidden;
    box-shadow: 0 20px 50px -20px #000;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    align-content: center;
    justify-content: center;
}

@media (max-width: 768px) {
    .concept-layout {
        grid-template-columns: 1fr;
    }

    .concepts-grid {
        column-count: 1;
    }
}

.group-1 .card-number {
    color: var(--color-group-1);
}

.group-1:hover {
    border-color: var(--color-group-1);
}

.group-1:hover {
    box-shadow: 0 10px 40px -10px rgba(74, 222, 128, 0.3);
}

.group-2 .card-number {
    color: var(--color-group-2);
}

.group-2:hover {
    border-color: var(--color-group-2);
}

.group-2:hover {
    box-shadow: 0 10px 40px -10px rgba(96, 165, 250, 0.3);
}

.group-3 .card-number {
    color: var(--color-group-3);
}

.group-3:hover {
    border-color: var(--color-group-3);
}

.group-3:hover {
    box-shadow: 0 10px 40px -10px rgba(250, 204, 21, 0.3);
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}
/* Navigation Controls */
.concept-navigation {
    display: flex;
    justify-content: space-between;
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid var(--glass-border);
}

.nav-btn {
    display: inline-flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: var(--text-main);
    text-decoration: none;
    transition: all 0.3s ease;
    font-weight: 500;
}

.nav-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
    border-color: var(--primary);
}

.nav-btn.disabled {
    opacity: 0.5;
    pointer-events: none;
    visibility: hidden;
}

.nav-btn svg {
    width: 20px;
    height: 20px;
}

.nav-prev svg {
    margin-right: 0.5rem;
}

.nav-next svg {
    margin-left: 0.5rem;
}

/* Language Selector */
.lang-selector {
    position: fixed;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 10px;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background: rgba(30, 30, 45, 0.8);
    padding: 10px;
    border-radius: 20px;
    border: 1px solid var(--glass-border);
}

.lang-selector button {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-weight: 600;
    cursor: pointer;
    font-family: inherit;
    padding: 5px 10px;
    border-radius: 10px;
    transition: all 0.2s;
}

.lang-selector button:hover {
    color: var(--text-main);
}

.lang-selector button.active {
    background: var(--primary);
    color: white;
}

/* ============================================================
   Shared interactive controls & buttons
   Previously each concept styled these ad-hoc (01/02/03 only)
   or not at all, so most concept buttons rendered as raw,
   unstyled browser buttons. This gives every concept the same
   look. Concepts may still refine via their local style.css.
   ============================================================ */
/* Los .controls FLUYEN debajo de la animación (no absolutos): width:100%
   los fuerza a su propia línea (en contenedores en fila hacen wrap; en
   columna quedan al final del stack). Así nunca tapan los gráficos, sea
   cual sea su altura (aunque incluyan botones apilados + textos de estado,
   como en caching). El contenido + controles se centran juntos en el viz. */
.controls {
    width: 100%;
    margin-top: 1.25rem;
    padding: 0 1rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.btn {
    background: #ffffff;
    color: #0f172a;
    border: none;
    padding: 0.7rem 1.4rem;
    border-radius: 30px;
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    line-height: 1;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, opacity 0.2s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 22px -8px rgba(255, 255, 255, 0.45);
}

.btn:active {
    transform: translateY(0) scale(0.96);
}

.btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn.secondary {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-main);
    border: 1px solid var(--glass-border);
}

.btn.secondary:hover {
    background: rgba(255, 255, 255, 0.16);
    box-shadow: none;
}

.btn.danger {
    background: #ef4444;
    color: #ffffff;
}

.btn.danger:hover {
    background: #dc2626;
    box-shadow: 0 8px 22px -8px rgba(239, 68, 68, 0.55);
}

/* ============================================================
   Shared visualization badges — icon nodes + connectors used by
   concept animations, based on the Pencil System Design thumbnail
   designs (single accent color per concept, badge + connector).
   ============================================================ */
.viz-badge {
    --badge-color: var(--primary);
    width: 84px;
    height: 84px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: color-mix(in srgb, var(--badge-color) 18%, transparent);
    border: 1.5px solid color-mix(in srgb, var(--badge-color) 55%, transparent);
    box-shadow: 0 0 24px color-mix(in srgb, var(--badge-color) 30%, transparent);
    transition: box-shadow 0.3s ease, transform 0.3s ease, background 0.3s ease, border-color 0.3s ease;
    flex-shrink: 0;
}

.viz-badge svg {
    width: 40px;
    height: 40px;
    stroke: var(--badge-color);
    color: var(--badge-color);
}

.viz-badge.active,
.viz-badge.pulse {
    transform: scale(1.06);
    box-shadow: 0 0 34px color-mix(in srgb, var(--badge-color) 55%, transparent);
}

.viz-label {
    margin-top: 0.6rem;
    font-weight: 600;
    color: var(--text-muted);
    text-align: center;
    font-size: 0.9rem;
}

.viz-connector {
    height: 2px;
    border-radius: 1px;
    background: color-mix(in srgb, var(--badge-color, var(--primary)) 45%, transparent);
    transition: background 0.3s ease;
}

/* Mode / toggle buttons — shared fallback (concepts may refine) */
.mode-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 0.5rem 1.5rem;
    border-radius: 20px;
    font-family: inherit;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.mode-btn:hover {
    color: var(--text-main);
}

.mode-btn.active {
    background: var(--primary);
    color: #ffffff;
}