/* ===================================================================
   DESIGN SYSTEM — Grupo Logístico Santos
   Capa base de diseño. Se incluye ANTES de cualquier otro CSS.
   No modifica estilos existentes; solo define variables y clases
   reutilizables que las páginas pueden adoptar gradualmente.
   =================================================================== */

/* -------------------------------------------------------------------
   1. CSS RESET MODERNO
   ------------------------------------------------------------------- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

img, picture, video, svg {
    display: block;
    max-width: 100%;
}

input, button, textarea, select {
    font: inherit;
}

a {
    color: inherit;
    text-decoration: none;
}

ul, ol {
    list-style: none;
}

/* -------------------------------------------------------------------
   2. VARIABLES CSS
   ------------------------------------------------------------------- */
:root {
    /* ── Colores principales ── */
    --color-primary:       #06397b;
    --color-primary-dark:  #052d62;
    --color-primary-light: #0a4fa6;
    --color-primary-50:    #e8f0fa;
    --color-primary-100:   #c5d9f0;

    --color-accent:        #f39c12;
    --color-accent-dark:   #d68910;
    --color-accent-light:  #feb027;

    /* ── Colores neutros ── */
    --color-white:         #ffffff;
    --color-off-white:     #f8fafc;
    --color-gray-50:       #f9fafb;
    --color-gray-100:      #f3f4f6;
    --color-gray-200:      #e5e7eb;
    --color-gray-300:      #d1d5db;
    --color-gray-400:      #9ca3af;
    --color-gray-500:      #6b7280;
    --color-gray-700:      #374151;
    --color-gray-900:      #111827;

    /* ── Colores de estado ── */
    --color-success:       #16a34a;
    --color-success-bg:    #d4edda;
    --color-warning:       #d97706;
    --color-warning-bg:    #fff3cd;
    --color-error:         #dc2626;
    --color-error-bg:      #f8d7da;

    /* ── Fondos ── */
    --bg-body:             var(--color-white);
    --bg-alt:              var(--color-off-white);
    --bg-hero:             var(--color-primary);

    /* ── Tipografía ── */
    --font-body:           'gordita_medium', sans-serif;
    --font-heading:        'gordita_black', sans-serif;
    --font-hero:           'Merriweather', serif;
    --font-light:          'gordita_light', sans-serif;

    /* Escala tipográfica — desktop */
    --text-hero:           clamp(2.5rem, 5vw, 4.25rem);   /* 40–68px */
    --text-h1:             clamp(2rem, 4vw, 3rem);         /* 32–48px */
    --text-h2:             clamp(1.5rem, 3vw, 2.25rem);    /* 24–36px */
    --text-h3:             clamp(1.15rem, 2vw, 1.5rem);    /* 18–24px */
    --text-body:           1rem;                            /* 16px */
    --text-sm:             0.875rem;                        /* 14px */
    --text-xs:             0.75rem;                         /* 12px */

    --leading-tight:       1.2;
    --leading-normal:      1.6;
    --leading-relaxed:     1.8;

    --tracking-tight:      -0.5px;
    --tracking-normal:     0;
    --tracking-wide:       1px;
    --tracking-wider:      2px;

    /* ── Espaciado ── */
    --space-xs:            0.25rem;   /* 4px */
    --space-sm:            0.5rem;    /* 8px */
    --space-md:            1rem;      /* 16px */
    --space-lg:            1.5rem;    /* 24px */
    --space-xl:            2.5rem;    /* 40px */
    --space-2xl:           5rem;      /* 80px */
    --space-3xl:           6.25rem;   /* 100px */

    --section-py:          var(--space-2xl);   /* 80px desktop */
    --container-max:       1200px;
    --container-px:        20px;

    /* ── Bordes y sombras ── */
    --radius-sm:           4px;
    --radius-md:           8px;
    --radius-lg:           12px;
    --radius-xl:           20px;
    --radius-full:         9999px;

    --shadow-sm:           0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md:           0 10px 30px rgba(0, 0, 0, 0.08);
    --shadow-lg:           0 20px 40px rgba(0, 0, 0, 0.12);
    --shadow-card:         0 10px 30px rgba(0, 0, 0, 0.05);
    --shadow-card-hover:   0 20px 40px rgba(0, 0, 0, 0.12);

    /* ── Transiciones ── */
    --ease-default:        0.3s ease;
    --ease-smooth:         0.4s cubic-bezier(0.25, 1, 0.5, 1);
    --ease-snappy:         0.3s cubic-bezier(0.77, 0.2, 0.05, 1.0);

    /* ── Z-index ── */
    --z-base:              1;
    --z-dropdown:          100;
    --z-sticky:            500;
    --z-overlay:           900;
    --z-menu:              1000;
    --z-header:            2000;
    --z-modal:             3000;
}

/* -------------------------------------------------------------------
   3. TIPOGRAFÍA BASE
   ------------------------------------------------------------------- */
body {
    font-family: var(--font-body);
    font-size: var(--text-body);
    line-height: var(--leading-normal);
    color: var(--color-gray-700);
    background: var(--bg-body);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

main {
    flex: 1 0 auto;
}

footer {
    flex-shrink: 0;
}

/* Headings genéricos — solo se aplican si no tienen ya estilos propios */
.ds-hero-title {
    font-family: var(--font-hero);
    font-size: var(--text-hero);
    font-weight: 900;
    line-height: var(--leading-tight);
    color: var(--color-white);
    letter-spacing: var(--tracking-tight);
}

.ds-h1 {
    font-family: var(--font-hero);
    font-size: var(--text-h1);
    font-weight: 900;
    line-height: var(--leading-tight);
    color: var(--color-primary);
}

.ds-h2 {
    font-family: var(--font-heading);
    font-size: var(--text-h2);
    font-weight: 800;
    line-height: 1.3;
    color: var(--color-primary);
}

.ds-h3 {
    font-family: var(--font-heading);
    font-size: var(--text-h3);
    font-weight: 800;
    line-height: 1.3;
    color: var(--color-primary);
}

.ds-text-sm {
    font-size: var(--text-sm);
}

.ds-text-xs {
    font-size: var(--text-xs);
}

.ds-text-upper {
    font-family: var(--font-body);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
    font-size: var(--text-xs);
}

/* -------------------------------------------------------------------
   4. LAYOUT — CONTAINER
   ------------------------------------------------------------------- */
.ds-container {
    width: 100%;
    max-width: var(--container-max);
    margin-inline: auto;
    padding-inline: var(--container-px);
}

.ds-container--narrow {
    max-width: 900px;
}

.ds-container--wide {
    max-width: 1400px;
}

/* -------------------------------------------------------------------
   5. SECCIONES
   ------------------------------------------------------------------- */

/* Hero de página interior */
.ds-section-hero {
    background: var(--bg-hero);
    padding: 100px var(--container-px) var(--section-py);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 280px;
}

.ds-section-hero .ds-hero-subtitle {
    font-family: var(--font-body);
    color: var(--color-accent);
    font-size: var(--text-sm);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
    margin-bottom: var(--space-sm);
}

.ds-section-hero .ds-hero-title {
    margin-bottom: var(--space-sm);
}

.ds-section-hero .ds-hero-desc {
    color: rgba(255, 255, 255, 0.8);
    font-size: var(--text-body);
    max-width: 600px;
}

/* Sección de contenido */
.ds-section {
    padding: var(--section-py) 0;
}

.ds-section--alt {
    background: var(--bg-alt);
}

/* -------------------------------------------------------------------
   6. GRIDS RESPONSIVE
   ------------------------------------------------------------------- */
.ds-grid {
    display: grid;
    gap: var(--space-lg);
}

.ds-grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.ds-grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.ds-grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

/* -------------------------------------------------------------------
   7. CARDS
   ------------------------------------------------------------------- */
.ds-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    overflow: hidden;
    transition: transform var(--ease-default), box-shadow var(--ease-default);
}

.ds-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-card-hover);
}

.ds-card__img {
    width: 100%;
    height: 220px;
    object-fit: cover;
}

.ds-card__body {
    padding: var(--space-lg);
}

.ds-card__title {
    font-family: var(--font-heading);
    font-size: var(--text-h3);
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
}

.ds-card__text {
    font-size: var(--text-sm);
    color: var(--color-gray-500);
    line-height: var(--leading-normal);
}

/* Card horizontal */
.ds-card--horizontal {
    display: grid;
    grid-template-columns: 280px 1fr;
}

.ds-card--horizontal .ds-card__img {
    height: 100%;
}

/* Card con borde superior de acento */
.ds-card--accent {
    border-top: 5px solid var(--color-accent);
}

/* Card simple sin imagen */
.ds-card--simple {
    padding: var(--space-lg);
}

.ds-card--simple:hover {
    transform: translateY(-5px);
}

/* -------------------------------------------------------------------
   8. BOTONES
   ------------------------------------------------------------------- */
.ds-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    font-family: var(--font-heading);
    font-size: var(--text-sm);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--ease-default);
    text-decoration: none;
    line-height: 1;
    white-space: nowrap;
}

/* Tamaños */
.ds-btn--sm {
    padding: 8px 20px;
    font-size: var(--text-xs);
}

.ds-btn--md {
    padding: 12px 32px;
    font-size: var(--text-sm);
}

.ds-btn--lg {
    padding: 16px 48px;
    font-size: var(--text-body);
}

/* Variantes */
.ds-btn--primary {
    background: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}

.ds-btn--primary:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(6, 57, 123, 0.3);
}

.ds-btn--accent {
    background: var(--color-accent);
    color: var(--color-white);
    border-color: var(--color-accent);
}

.ds-btn--accent:hover {
    background: var(--color-accent-dark);
    border-color: var(--color-accent-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(243, 156, 18, 0.3);
}

.ds-btn--outline {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.ds-btn--outline:hover {
    background: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
}

.ds-btn--outline-white {
    background: transparent;
    color: var(--color-white);
    border-color: var(--color-white);
}

.ds-btn--outline-white:hover {
    background: var(--color-white);
    color: var(--color-primary);
    transform: translateY(-2px);
}

/* -------------------------------------------------------------------
   9. BADGES
   ------------------------------------------------------------------- */
.ds-badge {
    display: inline-block;
    font-family: var(--font-heading);
    font-size: var(--text-xs);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    line-height: 1.4;
}

.ds-badge--primary {
    background: var(--color-primary);
    color: var(--color-white);
}

.ds-badge--accent {
    background: var(--color-accent);
    color: var(--color-white);
}

.ds-badge--light {
    background: var(--color-primary-50);
    color: var(--color-primary);
}

.ds-badge--gray {
    background: var(--color-gray-100);
    color: var(--color-gray-700);
}

/* -------------------------------------------------------------------
   10. DIVIDER / LÍNEA DECORATIVA
   ------------------------------------------------------------------- */
.ds-divider {
    width: 60px;
    height: 4px;
    background: var(--color-accent);
    border: none;
    border-radius: 2px;
}

.ds-divider--center {
    margin-inline: auto;
}

.ds-divider--wide {
    width: 100px;
}

/* -------------------------------------------------------------------
   11. UTILIDADES
   ------------------------------------------------------------------- */
.ds-text-center { text-align: center; }
.ds-text-left   { text-align: left; }
.ds-text-right  { text-align: right; }

.ds-mt-sm  { margin-top: var(--space-sm); }
.ds-mt-md  { margin-top: var(--space-md); }
.ds-mt-lg  { margin-top: var(--space-lg); }
.ds-mt-xl  { margin-top: var(--space-xl); }

.ds-mb-sm  { margin-bottom: var(--space-sm); }
.ds-mb-md  { margin-bottom: var(--space-md); }
.ds-mb-lg  { margin-bottom: var(--space-lg); }
.ds-mb-xl  { margin-bottom: var(--space-xl); }

.ds-hidden { display: none !important; }

/* -------------------------------------------------------------------
   12. PAGE HERO — Cabecera unificada para páginas interiores
   ------------------------------------------------------------------- */
.page-hero {
    background: var(--color-white);
    padding: 160px var(--container-px) 60px;
    text-align: center;
    position: relative;
}

.page-hero__title {
    font-family: var(--font-hero);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 900;
    color: var(--color-primary);
    line-height: var(--leading-tight);
    margin: 0;
}

.page-hero__subtitle {
    font-family: var(--font-body);
    font-size: var(--text-body);
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
    margin-bottom: var(--space-sm);
}

.page-hero__divider {
    width: 60px;
    height: 4px;
    background: var(--color-accent);
    border: none;
    border-radius: 2px;
    margin: var(--space-md) auto 0;
}

/* -------------------------------------------------------------------
   13. SCROLL TO TOP
   ------------------------------------------------------------------- */
.scroll-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--color-accent);
    color: var(--color-white);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease, background 0.3s ease;
    z-index: var(--z-sticky);
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-top:hover {
    background: var(--color-accent-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

.scroll-top.visible:hover {
    transform: translateY(-2px);
}

/* -------------------------------------------------------------------
   14. RESPONSIVE
   ------------------------------------------------------------------- */

/* Tablet: <= 1024px */
@media (max-width: 1024px) {
    :root {
        --section-py: 3.75rem;  /* 60px */
    }

    .ds-grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }

    .ds-grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }

    .ds-card--horizontal {
        grid-template-columns: 1fr;
    }

    .ds-card--horizontal .ds-card__img {
        height: 220px;
    }

    .ds-section-hero {
        min-height: 220px;
        padding-top: 80px;
    }

    .page-hero {
        padding: 90px var(--container-px) 50px;
    }
}

/* Mobile: <= 768px */
@media (max-width: 768px) {
    :root {
        --section-py: 3.125rem;  /* 50px */
        --container-px: 16px;
    }

    .ds-grid-4,
    .ds-grid-3,
    .ds-grid-2 {
        grid-template-columns: 1fr;
    }

    .ds-section-hero {
        min-height: 200px;
        padding: 80px 16px 40px;
    }

    .page-hero {
        padding: 80px 16px 40px;
    }

    .page-hero__title {
        font-size: clamp(1.75rem, 5vw, 2.25rem);
    }

    .ds-btn--lg {
        padding: 14px 36px;
        font-size: var(--text-sm);
    }

    .scroll-top {
        width: 42px;
        height: 42px;
        bottom: 20px;
        right: 20px;
        font-size: 20px;
    }
}