/* ==========================================================================
   Eldrex Digital — Unified Design System & Brand Guidelines CSS v2.1
   Enforces official identity standards across all site pages.
   Brand: Eldrex Delos Reyes Bula | v1.1 Compliant
   Fonts: 'Plus Jakarta Sans' (Body), 'Quicksand' (Headings)
   Palette: Monochromatic Black & White foundation (#000 / #fff)
   ========================================================================== */

/* Font Declarations via Google Fonts with display=swap */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,300..800;1,300..800&family=Quicksand:wght@400;500;600;700&display=swap');

/* ==========================================================================
   Design Tokens — Brand v1.1 Compliant
   Monochromatic foundation: #000000 (Primary) / #FFFFFF (Secondary)
   ========================================================================== */
:root {
    /* ── Typography ──────────────────────────────────────────────────────── */
    --font-body:    'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-heading: 'Quicksand', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    /* ── Brand Palette (Foundation) ──────────────────────────────────────── */
    --color-black: #000000;
    --color-white: #ffffff;

    /* ── Grayscale Scale (derived from brand palette) ────────────────────── */
    --gray-50:  #fafafa;
    --gray-100: #f5f5f5;
    --gray-150: #f0f0f0;
    --gray-200: #e8e8e8;
    --gray-300: #d1d1d1;
    --gray-400: #b0b0b0;
    --gray-500: #888888;
    --gray-600: #666666;
    --gray-700: #444444;
    --gray-800: #2a2a2a;
    --gray-900: #111111;

    /* ── Semantic Colors ─────────────────────────────────────────────────── */
    --color-bg:              var(--color-white);
    --color-text-primary:    var(--gray-900);
    --color-text-secondary:  var(--gray-600);
    --color-border:          var(--gray-200);
    --color-border-subtle:   var(--gray-200);

    /* ── Functional Callout Colors (grayscale — brand compliant) ─────────── */
    /* Warning / Critical — anchored in charcoal */
    --color-notice-warn-bg:     var(--gray-50);
    --color-notice-warn-border: var(--gray-800);
    --color-notice-warn-text:   var(--gray-900);
    --color-notice-warn-icon:   var(--gray-700);

    /* Info / Note — anchored in mid-gray */
    --color-notice-info-bg:     var(--gray-50);
    --color-notice-info-border: var(--gray-500);
    --color-notice-info-text:   var(--gray-800);
    --color-notice-info-icon:   var(--gray-600);

    /* ── Layout ──────────────────────────────────────────────────────────── */
    --header-height:     56px;
    --max-content-width: 780px;

    /* ── Timing Functions ────────────────────────────────────────────────── */
    --ease-out-expo:    cubic-bezier(0.16, 1, 0.3, 1);
    --ease-in-out:      cubic-bezier(0.76, 0, 0.24, 1);
    --ease-spring:      cubic-bezier(0.34, 1.56, 0.64, 1);

    /* ── Durations ───────────────────────────────────────────────────────── */
    --duration-fast: 150ms;
    --duration-base: 220ms;
    --duration-slow: 400ms;
    --duration-page: 600ms;

    /* ── Shorthand Transitions ───────────────────────────────────────────── */
    --transition-fast: var(--duration-fast) var(--ease-out-expo);
    --transition-base: var(--duration-base) var(--ease-out-expo);
    --transition-slow: var(--duration-slow) var(--ease-out-expo);
}

/* ==========================================================================
   Reset & Base
   ========================================================================== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    background: var(--color-bg);
    color: var(--color-text-primary);
    font-family: var(--font-body);
    line-height: 1.72;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    overflow-x: hidden;
    /* Page entry: fade + gentle upward slide */
    animation: ds-page-in var(--duration-page) var(--ease-out-expo) both;
}

/* ==========================================================================
   Keyframe Animations
   ========================================================================== */
@keyframes ds-page-in {
    from { opacity: 0; transform: translateY(14px); }
    to   { opacity: 1; transform: translateY(0);    }
}

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

@keyframes ds-slide-up {
    from { opacity: 0; transform: translateY(22px); }
    to   { opacity: 1; transform: translateY(0);    }
}

/* ==========================================================================
   Selection & Focus States
   ========================================================================== */
::selection {
    background-color: var(--color-black);
    color: var(--color-white);
}

a:focus-visible,
button:focus-visible,
.back-btn:focus-visible {
    outline: 2px solid var(--color-black);
    outline-offset: 3px;
    border-radius: 4px;
}

/* ==========================================================================
   Scroll-Progress Bar
   ========================================================================== */
.ds-progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    height: 2px;
    background: var(--color-black);
    width: 0%;
    z-index: 9999;
    transition: width 80ms linear;
    transform-origin: left;
    pointer-events: none;
}

/* ==========================================================================
   Unified Sticky Header
   ========================================================================== */
.app-header {
    position: sticky;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px) saturate(1.4);
    -webkit-backdrop-filter: blur(16px) saturate(1.4);
    border-bottom: 1px solid var(--color-border);
    padding: 0.75rem 1.5rem;
    z-index: 100;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition:
        background var(--transition-base),
        box-shadow var(--transition-base);
    animation: ds-fade-in var(--duration-slow) var(--ease-out-expo) both;
}

.app-header.scrolled {
    box-shadow: 0 1px 16px rgba(0, 0, 0, 0.06);
}

.back-btn {
    background: transparent;
    border: none;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition:
        background var(--transition-fast),
        transform var(--transition-fast);
    color: var(--gray-700);
    font-size: 1.1rem;
    text-decoration: none;
    will-change: transform;
}

.back-btn:hover {
    background: var(--gray-150);
    transform: scale(0.93) translateX(-1px);
}

.back-btn:active {
    transform: scale(0.86);
    transition-duration: 80ms;
}

.header-title {
    font-weight: 600;
    font-size: 1rem;
    letter-spacing: -0.2px;
    color: var(--color-black);
    font-family: var(--font-body);
}

/* ==========================================================================
   Typography — Brand Compliant
   Headings: Quicksand | Body: Plus Jakarta Sans
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    color: var(--color-black);
    text-rendering: optimizeLegibility;
}

h1 {
    font-size: 2.8rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 0.3rem;
    line-height: 1.12;
    animation: ds-slide-up var(--duration-slow) var(--ease-out-expo) 80ms both;
}

h2 {
    font-size: 1.45rem;
    letter-spacing: -0.02em;
    margin-bottom: 0.75rem;
    border-bottom: 1px solid var(--color-border-subtle);
    padding-bottom: 0.5rem;
}

h3 {
    font-size: 1.1rem;
    letter-spacing: -0.01em;
    margin: 1.2rem 0 0.5rem;
    font-weight: 700;
}

p {
    font-size: 0.95rem;
    color: var(--gray-800);
    line-height: 1.72;
    margin-bottom: 0.75rem;
}

a {
    color: var(--color-black);
    text-decoration: underline;
    text-underline-offset: 3px;
    text-decoration-thickness: 1px;
    transition:
        opacity var(--transition-fast),
        text-decoration-thickness var(--transition-fast);
}

a:hover {
    opacity: 0.6;
    text-decoration-thickness: 2px;
}

/* ==========================================================================
   Layout Containers
   ========================================================================== */
.page,
.main-content {
    max-width: var(--max-content-width);
    width: 100%;
    margin: 0 auto;
    padding: 2rem 1.5rem 3rem;
    flex: 1;
}

.meta-info {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    margin-bottom: 2rem;
    font-weight: 400;
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem 1.2rem;
    animation: ds-fade-in var(--duration-slow) var(--ease-out-expo) 160ms both;
}

.meta-info span { white-space: nowrap; }

.meta-info strong {
    color: var(--gray-700);
    font-weight: 600;
}

.intro-text {
    font-size: 1rem;
    color: var(--gray-800);
    margin-bottom: 2rem;
    line-height: 1.72;
    animation: ds-slide-up var(--duration-slow) var(--ease-out-expo) 200ms both;
}

.doc-section,
.term-section,
.policy-section,
.faq-item {
    margin-bottom: 2.2rem;
    padding-top: 0.2rem;
    /* Scroll-reveal: hidden until .ds-visible added by JS */
    opacity: 0;
    transform: translateY(18px);
    transition:
        opacity var(--duration-slow) var(--ease-out-expo),
        transform var(--duration-slow) var(--ease-out-expo);
    will-change: opacity, transform;
}

.doc-section.ds-visible,
.term-section.ds-visible,
.policy-section.ds-visible,
.faq-item.ds-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Fallback when JS is unavailable */
.ds-no-js .doc-section,
.ds-no-js .term-section,
.ds-no-js .policy-section,
.ds-no-js .faq-item {
    opacity: 1;
    transform: none;
}

hr {
    margin: 2rem 0;
    border: none;
    height: 1px;
    background: linear-gradient(
        90deg,
        transparent,
        var(--gray-200) 20%,
        var(--gray-200) 80%,
        transparent
    );
}

/* ==========================================================================
   Custom Lists — Brand Monochromatic
   ========================================================================== */
.simple-list, .bullet-list, .check-list, .cross-list {
    margin: 0.75rem 0 0.5rem 1.5rem;
    list-style: none;
}

.simple-list li, .bullet-list li, .check-list li, .cross-list li {
    position: relative;
    padding-left: 1.4rem;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
    color: var(--gray-800);
    line-height: 1.65;
}

/* Em-dash — neutral */
.simple-list li::before {
    content: "—";
    position: absolute;
    left: 0;
    color: var(--gray-400);
    font-weight: 400;
}

/* Bullet — neutral */
.bullet-list li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--gray-400);
}

/* Check — black (brand primary, confident) */
.check-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-black);
    font-weight: 700;
    font-size: 0.82rem;
}

/* Cross — mid-gray (prohibited, de-emphasized) */
.cross-list li::before {
    content: "×";
    position: absolute;
    left: 0;
    color: var(--gray-500);
    font-weight: 700;
    font-size: 0.9rem;
}

/* ==========================================================================
   Notice / Callout Boxes — Brand Monochromatic
   ========================================================================== */
.notice-warning,
.notice-info {
    padding: 0.9rem 1.1rem;
    margin: 1rem 0 1.2rem 0;
    border-radius: 10px;
    display: flex;
    align-items: flex-start;
    gap: 12px;
    font-size: 0.9rem;
    border-left: 3px solid;
    transition:
        box-shadow var(--transition-base),
        transform var(--transition-base);
}

.notice-warning:hover,
.notice-info:hover {
    box-shadow: 0 3px 14px rgba(0, 0, 0, 0.07);
    transform: translateX(2px);
}

/* Warning — charcoal border, near-white bg */
.notice-warning {
    background: var(--color-notice-warn-bg);
    border-color: var(--color-notice-warn-border);
    color: var(--color-notice-warn-text);
}

.notice-warning i {
    color: var(--color-notice-warn-icon);
    font-size: 1.1rem;
    margin-top: 2px;
    flex-shrink: 0;
}

/* Info — mid-gray border, near-white bg */
.notice-info {
    background: var(--color-notice-info-bg);
    border-color: var(--color-notice-info-border);
    color: var(--color-notice-info-text);
}

.notice-info i {
    color: var(--color-notice-info-icon);
    font-size: 1.1rem;
    margin-top: 2px;
    flex-shrink: 0;
}

/* ==========================================================================
   Brand Quote Component
   Used in design-guidelines appendix & similar brand statement contexts
   ========================================================================== */
.brand-quote {
    margin: 2rem 0;
    padding: 1.6rem 1.8rem;
    border-left: 3px solid var(--color-black);
    background: var(--gray-50);
    border-radius: 0 10px 10px 0;
}

.brand-quote blockquote {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--color-black);
    line-height: 1.55;
    letter-spacing: -0.01em;
    quotes: none;
    margin-bottom: 0.8rem;
}

.brand-quote blockquote::before,
.brand-quote blockquote::after {
    content: none;
}

.brand-quote cite {
    font-size: 0.8rem;
    font-style: normal;
    font-weight: 500;
    color: var(--gray-500);
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

/* Generic blockquote (blog posts, poems, etc.) */
blockquote {
    border-left: 3px solid var(--gray-300);
    padding: 0.75rem 1.2rem;
    margin: 1rem 0 1.2rem;
    color: var(--gray-700);
    font-style: italic;
    font-size: 0.95rem;
    line-height: 1.68;
    background: var(--gray-50);
    border-radius: 0 8px 8px 0;
}

/* ==========================================================================
   Tables
   ========================================================================== */
.size-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0 1.2rem;
    font-size: 0.9rem;
}

.size-table th,
.size-table td {
    padding: 0.7rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
    transition: background var(--transition-fast);
}

.size-table th {
    background: var(--gray-50);
    font-weight: 700;
    color: var(--color-black);
    font-family: var(--font-heading);
    font-size: 0.85rem;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.size-table td {
    color: var(--gray-800);
}

.size-table tr:hover td {
    background: var(--gray-50);
}

/* ==========================================================================
   Color Swatches (design-guidelines specific)
   ========================================================================== */
.color-swatch-row {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin: 1rem 0 1.2rem;
}

.color-swatch {
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: transform var(--transition-fast);
}

.color-swatch:hover {
    transform: translateY(-2px);
}

.swatch-circle {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 1px solid var(--gray-300);
    flex-shrink: 0;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.swatch-circle:hover {
    transform: scale(1.08);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
}

.swatch-circle.black { background: #000000; }
.swatch-circle.white { background: #ffffff; }

.swatch-details {
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--gray-600);
}

.swatch-details strong {
    color: var(--color-black);
    display: block;
    font-size: 0.9rem;
    font-weight: 700;
}

/* ==========================================================================
   Media & Image Containers
   ========================================================================== */
.illustration-container {
    width: 100%;
    max-width: 600px;
    margin: 0 auto 2rem auto;
    line-height: 0;
    overflow: hidden;
    border-radius: 6px;
}

.illustration-container img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform var(--duration-slow) var(--ease-out-expo);
}

.illustration-container:hover img {
    transform: scale(1.01);
}

.caption-text {
    font-size: 0.8rem;
    color: var(--gray-500);
    margin-top: 0.5rem;
    line-height: 1.4;
    text-align: center;
    font-style: italic;
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */
.meta-info { animation: ds-fade-in var(--duration-slow) var(--ease-out-expo) 160ms both; }

.closing-statement { margin-top: 2.5rem; }

.closing-statement p {
    font-size: 1rem;
    color: var(--color-black);
    line-height: 1.65;
    margin-bottom: 0.5rem;
}

.signature {
    margin-top: 1rem;
    font-weight: 600;
    color: var(--color-black);
    font-family: var(--font-heading);
}

.contact-link {
    color: var(--color-black);
    text-decoration: underline;
    text-underline-offset: 3px;
    font-weight: 500;
    transition: opacity var(--transition-fast);
}

.contact-link:hover { opacity: 0.55; }

.toc-list {
    list-style: none;
    margin: 1rem 0 1.5rem;
}

.toc-list li {
    padding: 0.35rem 0;
    font-size: 0.95rem;
    color: var(--gray-800);
    border-bottom: 1px solid var(--gray-200);
}

.toc-list li a {
    color: var(--color-black);
    text-decoration: none;
    font-weight: 500;
    display: inline-block;
    transition: opacity var(--transition-fast);
}

.toc-list li a:hover { opacity: 0.55; }

/* ==========================================================================
   Unified Site Footer
   ========================================================================== */
.site-footer {
    width: 100%;
    margin-top: auto;
    padding: 1.8rem 1.5rem 2rem;
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
    animation: ds-fade-in var(--duration-slow) var(--ease-out-expo) 300ms both;
}

.footer-inner {
    max-width: 720px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.footer-logo-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    cursor: pointer;
    transition:
        transform var(--transition-base),
        filter var(--transition-base);
    outline: none;
    will-change: transform;
}

.footer-logo-link:focus-visible {
    outline: 2px solid var(--color-black);
    outline-offset: 4px;
    border-radius: 8px;
}

.footer-logo-link:hover {
    transform: scale(1.04) translateY(-1px);
}

.footer-logo-link:active {
    transform: scale(0.97);
    transition-duration: 80ms;
}

.footer-logo-img {
    max-width: 100px;
    width: 100%;
    height: auto;
    opacity: 0.72;
    transition: opacity var(--transition-base);
    display: block;
}

.footer-logo-link:hover .footer-logo-img { opacity: 1; }

.footer-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.footer-links a {
    font-size: 0.75rem;
    font-family: var(--font-body);
    color: var(--gray-500);
    text-decoration: none;
    font-weight: 500;
    letter-spacing: 0.2px;
    position: relative;
    transition: color var(--transition-fast);
}

/* Animated underline on hover */
.footer-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-black);
    transition: width var(--transition-base);
}

.footer-links a:hover { color: var(--color-black); }
.footer-links a:hover::after { width: 100%; }

.footer-links .divider {
    color: var(--gray-300);
    font-size: 0.7rem;
    user-select: none;
}

/* ==========================================================================
   Media Queries
   ========================================================================== */
@media (max-width: 640px) {
    .page, .main-content { padding: 1.5rem 1.25rem 2.5rem; }
    h1 { font-size: 2.2rem; }
    .site-footer { padding: 1.2rem 1rem 1.5rem; }
    .footer-logo-img { max-width: 80px; }
    .footer-links a { font-size: 0.7rem; }
    .footer-links { gap: 1rem; }
}

@media (max-width: 480px) {
    .page, .main-content { padding: 1.2rem 1rem 2rem; }
    h1 { font-size: 1.9rem; }
    .footer-logo-img { max-width: 70px; }
    .footer-links { gap: 0.8rem; }
    .footer-links a { font-size: 0.65rem; }
}

/* ==========================================================================
   Reduced-Motion Accessibility
   https://www.w3.org/WAI/WCAG21/Understanding/animation-from-interactions
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    body { animation: none; }

    .doc-section,
    .term-section,
    .policy-section,
    .faq-item {
        opacity: 1;
        transform: none;
        transition: none;
    }
}