/* Base styles for Carbon Sink Calculator */

@import url('tokens.css');

/* ========================================
   Reset and base typography
   ======================================== */

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

html, body {
    background: var(--color-bg);
}

body {
    font-family: var(--font-body);
    font-size: var(--text-body);
    line-height: var(--leading-body);
    color: var(--color-text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: var(--weight-bold);
    line-height: var(--leading-tight);
    margin-bottom: var(--space-4);
}

a {
    color: var(--color-text);
    text-decoration: none;
    transition: color var(--duration-fast) var(--ease-out), opacity var(--duration-fast) var(--ease-out);
}

a:hover {
    opacity: 0.85;
}

img {
    display: block;
    max-width: 100%;
    height: auto;
}

b, strong { font-weight: var(--weight-bold); }

/* ========================================
   Container
   ======================================== */

.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding-left: var(--content-pad-x);
    padding-right: var(--content-pad-x);
}

@media (max-width: 1024px) {
    .container {
        padding-left: var(--content-pad-x-md);
        padding-right: var(--content-pad-x-md);
    }
}

@media (max-width: 600px) {
    .container {
        padding-left: var(--content-pad-x-sm);
        padding-right: var(--content-pad-x-sm);
    }
}

/* ========================================
   Site header — floating top bar (dark)
   ======================================== */

.site-header {
    position: relative;
    z-index: var(--z-nav);
    background: transparent;
    box-shadow: none;
}

/* Container holding only the mobile hamburger trigger.
   On desktop the hamburger is hidden, so this row collapses out of view. */
.nav-bar-row {
    display: none;
    align-items: center;
    justify-content: flex-end;
    padding-top: var(--space-6);
}

.menu-toggle {
    background: transparent;
    border: 1px solid var(--color-divider);
    border-radius: var(--radius-button);
    cursor: pointer;
    padding: var(--space-2) var(--space-3);
    transition: background-color var(--duration-fast) var(--ease-out);
}

.menu-toggle:hover {
    background: rgba(255, 255, 255, 0.08);
}

.menu-toggle:active {
    transform: scale(0.98);
}

.hamburger {
    display: inline-block;
    width: 24px;
    height: 18px;
    position: relative;
}

.hamburger span {
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    border-radius: 2px;
    transition: transform var(--duration-fast) var(--ease-out), opacity var(--duration-fast) var(--ease-out);
}

/* Cada línea sample un color distinto del gradient vertical:
   la línea de arriba toma el color del top (turquesa, end del
   gradient 0deg); la del medio toma una mezcla 50/50 con
   color-mix(); la de abajo toma el verde (start). Resultado:
   las 3 líneas juntas componen visualmente el gradient. */
.hamburger span:nth-child(1) {
    top: 0;
    background: var(--gradient-brand-end);
}
.hamburger span:nth-child(2) {
    top: 8px;
    background: color-mix(in srgb, var(--gradient-brand-start), var(--gradient-brand-end));
}
.hamburger span:nth-child(3) {
    bottom: 0;
    background: var(--gradient-brand-start);
}

.menu-toggle[aria-expanded="true"] .hamburger span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .hamburger span:nth-child(2) {
    opacity: 0;
}

.menu-toggle[aria-expanded="true"] .hamburger span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* ========================================
   Primary nav — horizontal pill (desktop)
   ======================================== */

.nav-wrap {
    padding-top: var(--space-12);
    padding-bottom: var(--space-8);
}

.nav-menu {
    display: flex;
    align-items: stretch;
    width: 100%;
    height: 48px;
    background: var(--gradient-brand);
    border-radius: var(--radius-pill);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    /* Inner padding to keep content clear of the rounded caps and add the
       generous right-side breathing room that the Figma layout has. */
    padding-left: 68px;
    padding-right: 96px;
}

.nav-brand {
    display: inline-flex;
    align-items: center;
    flex: 0 0 auto;
    text-decoration: none;
    transition: opacity var(--duration-fast) var(--ease-out);
}

.nav-brand img {
    height: 24px;
    width: auto;
    display: block;
}

.nav-brand:hover {
    opacity: 0.85;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 var(--space-8);
    color: var(--color-text-on-light);
    font-family: var(--font-body);
    font-size: var(--text-body);
    font-weight: var(--weight-regular);
    text-transform: uppercase;
    letter-spacing: var(--tracking-menu);
    text-decoration: none;
    border-left: 2px solid rgba(50, 50, 50, 0.55);
    transition: background var(--duration-fast) var(--ease-out);
}

.nav-link:hover {
    background: rgba(255, 255, 255, 0.18);
    opacity: 1;
}

.nav-link.is-active {
    font-weight: var(--weight-extrabold);
}

/* Push the nav links to the right of the brand */
.nav-brand + .nav-link {
    margin-left: auto;
    border-left: 0;
}

/* Drawer overlay — used on mobile */
.nav-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    z-index: var(--z-overlay);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--duration-normal) var(--ease-out), visibility var(--duration-normal) var(--ease-out);
}

.nav-overlay.open {
    opacity: 1;
    visibility: visible;
}

/* On narrow screens the nav collapses into a sidebar drawer */
@media (max-width: 900px) {
    .nav-bar-row { display: flex; }
    .nav-wrap { padding: 0; }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -320px;
        bottom: 0;
        width: 300px;
        height: 100vh;
        flex-direction: column;
        align-items: stretch;
        background: var(--gradient-brand-vertical);
        border-radius: 0;
        padding: var(--space-16) 0 0 0;
        box-shadow: -2px 0 16px rgba(0, 0, 0, 0.3);
        transition: right var(--duration-normal) var(--ease-out);
    }

    .nav-menu.open { right: 0; }

    .nav-brand {
        padding: var(--space-4) var(--space-6);
        border-bottom: 1px solid rgba(50, 50, 50, 0.25);
    }

    .nav-brand img { height: 28px; }

    .nav-link {
        justify-content: flex-start;
        padding: var(--space-4) var(--space-6);
        border-left: 0;
        border-bottom: 1px solid rgba(50, 50, 50, 0.25);
    }

    .nav-brand + .nav-link {
        margin-left: 0;
    }
}

/* ========================================
   Main + footer
   ======================================== */

main {
    flex: 1;
}

main.container {
    width: 100%;
}

.site-footer {
    margin-top: var(--space-16);
    padding: var(--space-6) 0 var(--space-12);
}

.site-footer .container {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.footer-logos {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-8);
    background: var(--color-surface);
    border-radius: var(--radius-container);
    padding: var(--space-5) var(--space-16);
    flex-wrap: wrap;
}

.footer-logo {
    height: 50px;
    width: auto;
    max-width: 200px;
    object-fit: contain;
    flex-shrink: 0;
}

.footer-meta {
    text-align: center;
    color: var(--color-text-muted);
}

.footer-text {
    color: var(--color-text-muted);
    font-size: var(--text-small);
    margin: 0;
}

.footer-text + .footer-text {
    margin-top: var(--space-2);
}

.footer-text a {
    color: var(--color-text);
    text-decoration: underline;
}

@media (max-width: 768px) {
    .footer-logos {
        justify-content: center;
        padding: var(--space-4);
        gap: var(--space-5);
    }
    .footer-logo { height: 36px; }
}

/* ========================================
   Shared page sections — 2-column hero/section layout
   Used by Home, Calculadora and Más Info to render a text-on-left,
   illustration-on-right block. Class names are kept generic so any
   page can reuse them.
   ======================================== */

.page-hero__title {
    font-family: var(--font-display);
    font-weight: var(--weight-bold);
    font-size: var(--text-display);
    line-height: var(--leading-display);
    color: var(--color-text);
    margin: 0 0 var(--space-6);
    letter-spacing: var(--tracking-tight);
}

.page-hero__title span {
    display: block;
}

.page-section {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
    align-items: center;
    gap: var(--space-12);
}

.page-section__copy {
    max-width: var(--content-text-narrow);
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.page-section__rule {
    display: block;
    width: var(--decoration-line-width);
    height: var(--decoration-line-height);
    background: var(--gradient-brand-horizontal);
    border-radius: 2px;
    margin-bottom: var(--space-12);
}

.page-section__text {
    font-family: var(--font-body);
    font-size: var(--text-body);
    line-height: var(--leading-body);
    color: var(--color-text);
    margin: 0;
}

.page-section__text strong,
.page-carousel__slide strong {
    font-weight: var(--weight-bold);
    color: var(--color-text);
}

.page-section__art {
    position: relative;
    width: 100%;
}

.page-section__art img {
    display: block;
    width: 100%;
    height: auto;
    object-fit: contain;
}

/* ========================================
   Shared carousel — slides + clickable dots
   Activated by data-page-carousel attribute; behavior in carousel.js.
   ======================================== */

.page-carousel {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.page-carousel__slides {
    position: relative;
    display: grid;
    align-items: start;
    min-height: var(--space-16);
}

.page-carousel__slide {
    grid-area: 1 / 1;
    margin: 0;
    font-family: var(--font-body);
    font-size: var(--text-body);
    line-height: var(--leading-body);
    color: var(--color-text);
    opacity: 0;
    visibility: hidden;
    transition:
        opacity var(--duration-normal) var(--ease-out),
        visibility var(--duration-normal) var(--ease-out);
}

.page-carousel__slide.is-active {
    opacity: 1;
    visibility: visible;
}

/* Slides inactivos salen del flujo del grid → solo el activo aporta
   altura al contenedor, así los dots quedan justo debajo del texto
   visible (en vez de empujados al alto del slide más largo). */
.page-carousel__slide:not(.is-active) {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
}

.page-carousel__dots {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-top: var(--space-2);
}

.page-carousel__dot {
    width: 10px;
    height: 10px;
    padding: 0;
    border: 0;
    border-radius: 50%;
    background: rgba(240, 240, 240, 0.35);
    cursor: pointer;
    transition:
        background var(--duration-fast) var(--ease-out),
        transform var(--duration-fast) var(--ease-out);
}

.page-carousel__dot:hover {
    background: rgba(240, 240, 240, 0.65);
}

.page-carousel__dot:focus-visible {
    outline: 2px solid var(--color-verde-principal);
    outline-offset: 3px;
}

.page-carousel__dot.is-active {
    background: var(--color-text);
    transform: scale(1.1);
}

@media (max-width: 1024px) {
    .page-section {
        grid-template-columns: minmax(0, 1fr);
        gap: var(--space-8);
    }

    .page-section__copy {
        max-width: 100%;
    }

    .page-hero__title {
        font-size: 64px;
        line-height: 1.1;
    }
}

@media (max-width: 600px) {
    .page-hero__title {
        font-size: 48px;
    }
}

/* ========================================
   Brand buttons & gradient borders
   Reusable across pages: any new button or bordered element
   on the site should consume these so the gradient stays consistent.
   ======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    min-height: 48px;
    font-family: var(--font-body);
    font-size: var(--text-body);
    font-weight: var(--weight-semibold);
    text-transform: uppercase;
    letter-spacing: var(--tracking-label);
    text-decoration: none;
    border: 0;
    border-radius: var(--radius-pill);
    cursor: pointer;
    transition:
        transform var(--duration-fast) var(--ease-out),
        box-shadow var(--duration-fast) var(--ease-out),
        opacity var(--duration-fast) var(--ease-out);
}

.btn:hover { opacity: 1; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn:focus-visible {
    outline: 2px solid var(--color-verde-principal);
    outline-offset: 2px;
}

/* Solid filled button — uses the canonical gradient */
.btn-brand {
    background: var(--gradient-brand);
    color: var(--color-text-on-light);
}

.btn-brand:hover {
    box-shadow: 0 6px 18px rgba(0, 153, 184, 0.35);
}

/* Gradient-bordered button (transparent inside, gradient outline)
   Two-layer trick: padding-box gets the bg solid, border-box gets the gradient. */
.btn-brand-outline {
    background:
        linear-gradient(var(--color-bg), var(--color-bg)) padding-box,
        var(--gradient-brand) border-box;
    color: var(--color-text);
    border: 2px solid transparent;
}

.btn-brand-outline:hover {
    background:
        linear-gradient(var(--color-bg-elevated), var(--color-bg-elevated)) padding-box,
        var(--gradient-brand) border-box;
}

/* Generic utility: apply a brand-gradient border to any element with a radius.
   Set --gradient-border-bg if the element sits on a non-default surface. */
.gradient-border {
    --gradient-border-bg: var(--color-bg);
    background:
        linear-gradient(var(--gradient-border-bg), var(--gradient-border-bg)) padding-box,
        var(--gradient-brand) border-box;
    border: 2px solid transparent;
}

/* Helper modifier: gradient-bordered element sitting on the light surface
   (e.g. inside the white footer container or any --color-surface card). */
.gradient-border--on-surface {
    --gradient-border-bg: var(--color-surface);
}

/* ========================================
   Legal disclaimer modal (entry notice)
   ======================================== */

.disclaimer-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(3px);
    -webkit-backdrop-filter: blur(3px);
    z-index: var(--z-modal);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--duration-normal) var(--ease-out), visibility var(--duration-normal) var(--ease-out);
}

.disclaimer-overlay.open {
    opacity: 1;
    visibility: visible;
}

.disclaimer-modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    z-index: calc(var(--z-modal) + 1);
    background-color: #fff;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    max-width: 540px;
    width: 90vw;
    padding: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--duration-normal) var(--ease-out), visibility var(--duration-normal) var(--ease-out), transform var(--duration-normal) var(--ease-out);
}

.disclaimer-modal.open {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, -50%) scale(1);
}

.disclaimer-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1.5rem 1.5rem 0.75rem;
    border-left: 4px solid var(--color-warning);
    margin-left: 0;
}

.disclaimer-header .disclaimer-icon {
    color: var(--color-warning);
    font-size: 1.5rem;
    flex-shrink: 0;
}

.disclaimer-header h2 {
    font-family: var(--font-body);
    font-size: 1.35rem;
    font-weight: var(--weight-medium);
    margin: 0;
    color: var(--color-text-on-light);
    line-height: var(--leading-tight);
}

.disclaimer-body {
    padding: 0 1.5rem 1.25rem;
    font-size: 0.95rem;
    line-height: 1.65;
    color: #444;
}

.disclaimer-body p {
    margin: 0;
}

.disclaimer-footer {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: flex-end;
    gap: 0.75rem;
    padding: 1rem 1.5rem 1.5rem;
    background-color: #f8f9fa;
    border-top: 1px solid #e3e5e8;
}

.disclaimer-btn {
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: var(--weight-medium);
    padding: 0.55rem 1.25rem;
    border-radius: var(--radius-button);
    cursor: pointer;
    border: 1px solid transparent;
    transition: background-color var(--duration-fast) var(--ease-out), color var(--duration-fast) var(--ease-out), border-color var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast) var(--ease-out);
}

.disclaimer-btn-secondary {
    background-color: #fff;
    color: var(--color-text-on-light);
    border-color: #d4d7da;
}

.disclaimer-btn-secondary:hover {
    background-color: #f0f0f0;
    border-color: #c4c7ca;
}

.disclaimer-btn-primary {
    background: var(--gradient-brand);
    color: var(--color-text-on-light);
    border-color: transparent;
}

.disclaimer-btn-primary:hover {
    box-shadow: 0 2px 12px rgba(85, 223, 63, 0.35);
    opacity: 1;
}

@media (max-width: 480px) {
    .disclaimer-footer {
        flex-direction: column-reverse;
        align-items: stretch;
    }

    .disclaimer-btn {
        width: 100%;
        text-align: center;
    }
}