/* =============================================================
   KAD · style.css
   Núcleo global: fuentes, variables, utilidades, header, footer
   ============================================================= */

/* =============================================================
   1. Fuentes
   ============================================================= */

@font-face {
    font-family: 'Bree Serif';
    src: url('../font/BreeSerif-Regular.ttf') format('truetype');
    font-weight: 400;
    font-display: swap;
}

@font-face {
    font-family: 'Inter';
    src: url('../font/Inter_18pt-Regular.ttf') format('truetype');
    font-weight: 400;
    font-display: swap;
}

@font-face {
    font-family: 'Inter';
    src: url('../font/Inter_18pt-Medium.ttf') format('truetype');
    font-weight: 500;
    font-display: swap;
}

@font-face {
    font-family: 'Inter';
    src: url('../font/Inter_18pt-SemiBold.ttf') format('truetype');
    font-weight: 600;
    font-display: swap;
}

@font-face {
    font-family: 'Inter';
    src: url('../font/Inter_18pt-Bold.ttf') format('truetype');
    font-weight: 700;
    font-display: swap;
}

@font-face {
    font-family: 'DM Mono';
    src: url('../font/DMMono-Regular.ttf') format('truetype');
    font-weight: 400;
    font-display: swap;
}

@font-face {
    font-family: 'DM Mono';
    src: url('../font/DMMono-Medium.ttf') format('truetype');
    font-weight: 500;
    font-display: swap;
}

/* =============================================================
   2. Variables — Tema claro (por defecto)
   ============================================================= */

:root {
    /* Colores */
    --color-bg:             #FFFFFF;
    --color-bg-soft:        #F5F5F5;
    --color-text:           #1A1A1A;
    --color-text-soft:      #6B7280;
    --color-primary:        #D50022;
    --color-primary-hover:  #B0001C;
    --color-border:         #E5E5E5;
    --color-tag-bg:         #F0F0F0;
    --color-tag-text:       #374151;
    --color-success:        #16A34A;
    --color-cta-secondary:  #F5F5F5;

    /* Tipografía */
    --font-heading: 'Bree Serif', Georgia, serif;
    --font-body:    'Inter', system-ui, sans-serif;
    --font-mono:    'DM Mono', 'Courier New', monospace;

    /* Escala tipográfica */
    --text-xs:    0.75rem;
    --text-sm:    0.875rem;
    --text-base:  1rem;
    --text-lg:    1.125rem;
    --text-xl:    1.5rem;
    --text-2xl:   2rem;
    --text-3xl:   2.5rem;
    --text-hero:  3.5rem;

    /* Espaciado */
    --space-xs:   0.25rem;
    --space-sm:   0.5rem;
    --space-md:   1rem;
    --space-lg:   1.5rem;
    --space-xl:   2rem;
    --space-2xl:  3rem;
    --space-3xl:  4rem;

    /* Layout */
    --max-width:        1200px;
    --padding-section:  1.5rem;
    --gap-cards:        1rem;
    --radius-card:      0.75rem;
    --radius-btn:       0.5rem;
    --radius-input:     0.75rem;

    /* Sombras */
    --shadow-sm:  0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md:  0 4px 12px rgba(0, 0, 0, 0.10);
    --shadow-lg:  0 8px 24px rgba(0, 0, 0, 0.12);

    /* Transiciones */
    --transition: 0.2s ease;
}

/* =============================================================
   3. Variables — Tema oscuro
   ============================================================= */

[data-theme="dark"] {
    --color-bg:             #0F0F0F;
    --color-bg-soft:        #1A1A1A;
    --color-text:           #F5F5F5;
    --color-text-soft:      #9CA3AF;
    --color-primary:        #FF2D4A;
    --color-primary-hover:  #E6001F;
    --color-border:         #2A2A2A;
    --color-tag-bg:         #252525;
    --color-tag-text:       #D1D5DB;
    --color-cta-secondary:  #1A1A1A;

    --shadow-sm:  0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md:  0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg:  0 8px 24px rgba(0, 0, 0, 0.5);
}

/* =============================================================
   4. Base global
   ============================================================= */

html {
    scroll-behavior: smooth;
    font-size: 16px;
    height: 100%;
}

body {
    font-family:      var(--font-body);
    font-weight:      400;
    font-size:        var(--text-base);
    color:            var(--color-text);
    background-color: var(--color-bg);
    line-height:      1.6;
    position:         relative;
    min-height:       100%;
    -webkit-font-smoothing: antialiased;
    transition: background-color var(--transition), color var(--transition);
}

/* =============================================================
   5. Utilidades
   ============================================================= */

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--padding-section);
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
}

/* =============================================================
   6. Header — Mobile First
   ============================================================= */

.header {
    width: 100%;
    height: 4rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--padding-section);
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color var(--transition), border-color var(--transition);
}

.header__logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.header__logo img {
    height: 2rem;
    width: auto;
}

.header__logo-text {
    font-family:  var(--font-heading);
    font-size:    var(--text-lg);
    font-weight:  400;
    color:        var(--color-text);
    letter-spacing: -0.01em;
}

.header__logo-text span {
    color: var(--color-primary);
}

.header__actions {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.header__theme-toggle {
    width: 2rem;
    height: 2rem;
    border: none;
    background: none;
    cursor: pointer;
    color: var(--color-text-soft);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-btn);
    transition: color var(--transition), background-color var(--transition);
}

.header__theme-toggle:hover {
    color: var(--color-text);
    background-color: var(--color-tag-bg);
}

/* =============================================================
   7. Footer — Mobile First
   ============================================================= */

.footer {
    width: 100%;
    padding: var(--space-xl) var(--padding-section);
    border-top: 1px solid var(--color-border);
    background-color: var(--color-bg);
}

.footer__inner {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.footer__brand {
    font-family: var(--font-heading);
    font-size:   var(--text-lg);
    color:       var(--color-text);
}

.footer__brand span {
    color: var(--color-primary);
}

.footer__links {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.footer__links a {
    font-size:  var(--text-sm);
    color:      var(--color-text-soft);
    transition: color var(--transition);
}

.footer__links a:hover {
    color: var(--color-primary);
}

.footer__copy {
    font-size: var(--text-xs);
    color:     var(--color-text-soft);
    font-family: var(--font-mono);
}

/* =============================================================
   8. Botones base
   ============================================================= */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-btn);
    font-family:   var(--font-body);
    font-weight:   600;
    font-size:     var(--text-base);
    cursor: pointer;
    border: none;
    transition: background-color var(--transition),
                color var(--transition),
                transform var(--transition),
                box-shadow var(--transition);
}

.btn:active {
    transform: translateY(1px);
}

.btn--primary {
    background-color: var(--color-primary);
    color: #FFFFFF;
}

.btn--primary:hover {
    background-color: var(--color-primary-hover);
    box-shadow: var(--shadow-md);
}

.btn--secondary {
    background-color: var(--color-cta-secondary);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn--secondary:hover {
    background-color: var(--color-tag-bg);
}

.btn--ghost {
    background-color: transparent;
    color: var(--color-text-soft);
    border: 1px solid var(--color-border);
}

.btn--ghost:hover {
    color: var(--color-text);
    border-color: var(--color-text);
}

/* =============================================================
   9. Media queries
   ============================================================= */

/* Tablets / Móviles grandes */
@media only screen and (min-width: 481px) and (max-width: 768px) {
    .footer__inner {
        flex-direction: row;
        flex-wrap: wrap;
        align-items: center;
        justify-content: space-between;
    }

    .footer__links {
        flex-direction: row;
        gap: var(--space-md);
    }
}

/* Tablets Pro vertical */
@media only screen and (min-width: 769px) and (max-width: 1279px) and (orientation: portrait) {
    .header {
        padding: 0 3vw;
    }

    .footer {
        padding: var(--space-xl) 3vw;
    }

    --padding-section: 3vw;
}

/* Laptops / Tablets horizontal */
@media only screen and (min-width: 769px) and (max-width: 1279px) and (orientation: landscape) {
    .header {
        padding: 0 3vw;
    }

    .footer {
        padding: var(--space-xl) 3vw;
    }
}

/* Escritorio */
@media only screen and (min-width: 1280px) {
    .header {
        padding: 0 5vw;
    }

    .footer {
        padding: var(--space-2xl) 5vw;
    }

    .footer__inner {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
    }

    .footer__links {
        flex-direction: row;
        gap: var(--space-lg);
    }

    --gap-cards:       1.5rem;
    --padding-section: 5vw;
    --radius-card:     1rem;
}

/* =============================================================
   View Transitions — Navegación entre páginas
   ============================================================= */

@view-transition {
    navigation: auto;
}

#logoImg {
    view-transition-name: kad-logo;
}

#searchBar {
    view-transition-name: search-bar;
}

::view-transition-old(kad-logo),
::view-transition-new(kad-logo) {
    animation-duration: 0.35s;
    animation-timing-function: ease-in-out;
}

::view-transition-old(search-bar),
::view-transition-new(search-bar) {
    animation-duration: 0.3s;
    animation-timing-function: ease-in-out;
}

::view-transition-old(root) {
    animation: 0.25s ease-out fade-out;
}

::view-transition-new(root) {
    animation: 0.25s ease-in fade-in;
}

@keyframes fade-out {
    from { opacity: 1; }
    to   { opacity: 0; }
}

@keyframes fade-in {
    from { opacity: 0; }
    to   { opacity: 1; }
}