/* ============================================================
   Crabbxolotl Preservation Society — Stylesheet
   Phase 2: CSS styling (mobile-first, earthy conservation aesthetic)
   ============================================================ */

/* ============================================================
   1. CSS CUSTOM PROPERTIES
   ============================================================ */
:root {
    /* --- Colors (from poster palette) --- */
    --color-primary: #2D5A3D;
    --color-primary-dark: #1E3D2A;
    --color-primary-light: #3A7450;
    --color-primary-muted: rgba(45, 90, 61, 0.12);
    --color-bg: #F5F0E8;
    --color-bg-alt: #EDE6D8;
    --color-bg-white: #FFFFFF;
    --color-text: #2C2C2C;
    --color-text-light: #555555;
    --color-accent: #8A8A8A;
    --color-accent-light: #B0B0B0;
    --color-border: #D5CFC4;
    --color-overlay: rgba(30, 61, 42, 0.85);

    /* --- Fonts --- */
    --font-heading: 'Playfair Display', Georgia, 'Times New Roman', serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    /* --- Font sizes (mobile-first, fluid where possible) --- */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-md: 1.125rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-size-3xl: 2.5rem;
    --font-size-hero: 2.75rem;

    /* --- Spacing scale (4px base) --- */
    --space-1: 0.25rem;   /* 4px  */
    --space-2: 0.5rem;    /* 8px  */
    --space-3: 0.75rem;   /* 12px */
    --space-4: 1rem;      /* 16px */
    --space-5: 1.25rem;   /* 20px */
    --space-6: 1.5rem;    /* 24px */
    --space-8: 2rem;      /* 32px */
    --space-10: 2.5rem;   /* 40px */
    --space-12: 3rem;     /* 48px */
    --space-16: 4rem;     /* 64px */
    --space-20: 5rem;     /* 80px */
    --space-24: 6rem;     /* 96px */

    /* --- Layout --- */
    --max-width: 1200px;
    --nav-height: 64px;
    --border-radius-sm: 6px;
    --border-radius-md: 10px;
    --border-radius-lg: 16px;
    --border-radius-full: 9999px;

    /* --- Shadows --- */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.08), 0 4px 10px rgba(0, 0, 0, 0.05);

    /* --- Transitions --- */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

/* ============================================================
   2. RESET & BASE STYLES
   ============================================================ */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    scroll-padding-top: var(--nav-height);
}

body {
    font-family: var(--font-body);
    font-size: var(--font-size-base);
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

figure {
    margin: 0;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

ul, ol {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input {
    font-family: inherit;
    font-size: inherit;
}

/* ============================================================
   3. UTILITY CLASSES
   ============================================================ */

/* Screen-reader only (visible to assistive tech) */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Shared container */
.container,
.section-container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

/* Buttons */
.btn,
.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-sm);
    font-weight: 600;
    letter-spacing: 0.03em;
    border-radius: var(--border-radius-full);
    transition: all var(--transition-base);
    text-decoration: none;
    cursor: pointer;
    border: 2px solid transparent;
}

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

.btn:hover,
.btn:focus-visible {
    background: var(--color-primary);
    color: var(--color-bg-white);
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-bg-white);
}

.btn-primary:hover,
.btn-primary:focus-visible {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Fade-in animation class (JS will add .visible) */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================================
   4. NAVIGATION
   ============================================================ */
.site-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--nav-height);
    background: transparent;
    transition: background var(--transition-base), box-shadow var(--transition-base);
}

/* Scrolled state (JS will toggle .scrolled) */
.site-nav.scrolled {
    background: var(--color-primary);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-6);
    height: 100%;
}

/* Mobile hamburger toggle */
.nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    color: var(--color-bg-white);
    border-radius: var(--border-radius-sm);
    transition: background var(--transition-fast);
}

.nav-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Hamburger icon lines */
.nav-toggle-icon,
.nav-toggle-icon::before,
.nav-toggle-icon::after {
    display: block;
    width: 22px;
    height: 2px;
    background: currentColor;
    border-radius: 2px;
    transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav-toggle-icon {
    position: relative;
    background: transparent;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
    content: '';
    position: absolute;
    left: 0;
}

.nav-toggle-icon::before {
    top: -7px;
}

.nav-toggle-icon::after {
    top: 7px;
}

/* Hamburger X animation when .active is toggled */
.nav-toggle.active .nav-toggle-icon {
    background: transparent;
}

.nav-toggle.active .nav-toggle-icon::before {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle.active .nav-toggle-icon::after {
    transform: translateY(-7px) rotate(-45deg);
}

/* Nav links */
.nav-links {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-primary);
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding-top: var(--space-12);
    gap: var(--space-6);
    transition: transform var(--transition-slow), opacity var(--transition-base);
}

/* Mobile nav open state */
.nav-links.active {
    display: flex;
}

.nav-links li a {
    font-family: var(--font-heading);
    font-size: var(--font-size-xl);
    color: var(--color-bg-white);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--border-radius-sm);
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.nav-links li a:hover,
.nav-links li a:focus-visible {
    background: rgba(255, 255, 255, 0.12);
    transform: translateX(4px);
}

/* ============================================================
   5. HERO SECTION
   ============================================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: calc(var(--nav-height) + var(--space-8)) var(--space-6) var(--space-16);
    background:
        linear-gradient(
            180deg,
            rgba(45, 90, 61, 0.92) 0%,
            rgba(30, 61, 42, 0.95) 100%
        ),
        var(--color-primary);
    color: var(--color-bg-white);
    overflow: hidden;
}

/* Subtle texture overlay */
.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 30% 20%, rgba(245, 240, 232, 0.06) 0%, transparent 60%),
        radial-gradient(ellipse at 70% 80%, rgba(245, 240, 232, 0.04) 0%, transparent 60%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 720px;
}

/* Logo */
.hero-logo {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto var(--space-8);
    border: 4px solid rgba(245, 240, 232, 0.3);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
    transition: transform var(--transition-slow), box-shadow var(--transition-slow);
}

.hero-logo:hover {
    transform: scale(1.04);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

/* Hero heading */
.hero h1 {
    font-family: var(--font-heading);
    font-size: var(--font-size-hero);
    font-weight: 700;
    line-height: 1.15;
    margin-bottom: var(--space-4);
    letter-spacing: -0.01em;
}

/* Tagline */
.tagline {
    font-family: var(--font-heading);
    font-size: var(--font-size-lg);
    font-style: italic;
    color: rgba(245, 240, 232, 0.8);
    margin-bottom: var(--space-6);
    letter-spacing: 0.08em;
}

/* Mission statement */
.mission {
    font-size: var(--font-size-md);
    line-height: 1.8;
    color: rgba(245, 240, 232, 0.85);
    margin-bottom: var(--space-10);
    max-width: 540px;
    margin-left: auto;
    margin-right: auto;
}

/* ============================================================
   6. SECTION HEADINGS (shared)
   ============================================================ */
section h2 {
    font-family: var(--font-heading);
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-primary);
    text-align: center;
    margin-bottom: var(--space-10);
    position: relative;
}

/* Decorative underline on section headings */
section h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--color-primary);
    border-radius: 2px;
    margin: var(--space-4) auto 0;
}

/* ============================================================
   7. ABOUT SECTION
   ============================================================ */
.about {
    padding: var(--space-16) 0;
    background: var(--color-bg);
}

/* Two-column grid (stacks on mobile) */
.about-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-8);
    margin-bottom: var(--space-12);
}

.about-image {
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.about-image img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.about-image:hover img {
    transform: scale(1.03);
}

.about-image figcaption {
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    font-style: italic;
    text-align: center;
    background: var(--color-bg-white);
}

.about-text {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.about-text p {
    font-size: var(--font-size-md);
    line-height: 1.8;
    color: var(--color-text);
}

/* Map placeholder */
.map-placeholder {
    max-width: 640px;
    margin: 0 auto;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
}

.map-illustration {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-8);
    padding: var(--space-12) var(--space-8);
    background: var(--color-bg-alt);
    min-height: 160px;
}

.map-label {
    font-family: var(--font-heading);
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-primary);
    opacity: 0.3;
    letter-spacing: 0.1em;
}

.map-placeholder figcaption {
    padding: var(--space-4) var(--space-6);
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    text-align: center;
    background: var(--color-bg-white);
    line-height: 1.6;
}

/* ============================================================
   8. WHAT WE DO SECTION
   ============================================================ */
.what-we-do {
    padding: var(--space-16) 0;
    background: var(--color-bg-alt);
}

/* 2x2 grid on desktop, single column on mobile */
.pillars-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-6);
}

.pillar-card {
    background: var(--color-bg-white);
    border-radius: var(--border-radius-lg);
    padding: var(--space-8) var(--space-6);
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.pillar-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.pillar-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 72px;
    height: 72px;
    margin: 0 auto var(--space-6);
    border-radius: 50%;
    background: var(--color-primary-muted);
    color: var(--color-primary);
    transition: background var(--transition-base), transform var(--transition-base);
}

.pillar-card:hover .pillar-icon {
    background: var(--color-primary);
    color: var(--color-bg-white);
    transform: scale(1.08);
}

.pillar-icon svg {
    width: 48px;
    height: 48px;
}

.pillar-card h3 {
    font-family: var(--font-heading);
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--space-3);
}

.pillar-card p {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    line-height: 1.7;
}

/* ============================================================
   9. HOW YOU CAN HELP SECTION
   ============================================================ */
.help {
    padding: var(--space-16) 0;
    background: var(--color-bg);
}

.help-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-6);
}

.help-card {
    background: var(--color-bg-white);
    border-radius: var(--border-radius-lg);
    padding: var(--space-8) var(--space-6);
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.help-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.help-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-5);
    border-radius: 50%;
    background: var(--color-primary-muted);
    color: var(--color-primary);
    transition: background var(--transition-base), transform var(--transition-base);
}

.help-card:hover .help-icon {
    background: var(--color-primary);
    color: var(--color-bg-white);
    transform: scale(1.08);
}

.help-icon svg {
    width: 48px;
    height: 48px;
}

.help-card h3 {
    font-family: var(--font-heading);
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--space-3);
}

.help-card p {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    line-height: 1.7;
}

/* ============================================================
   10. JOIN CTA SECTION
   ============================================================ */
.join {
    padding: var(--space-20) 0;
    background: var(--color-primary);
    color: var(--color-bg-white);
    text-align: center;
    position: relative;
    overflow: hidden;
}

/* Subtle background pattern */
.join::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(245, 240, 232, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 50%, rgba(245, 240, 232, 0.04) 0%, transparent 50%);
    pointer-events: none;
}

.join .section-container {
    position: relative;
    z-index: 1;
}

.join h2 {
    color: var(--color-bg-white);
}

.join h2::after {
    background: var(--color-bg-white);
}

.join-text {
    font-size: var(--font-size-md);
    margin-bottom: var(--space-8);
    color: rgba(245, 240, 232, 0.85);
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
}

/* Form */
.join-form {
    max-width: 480px;
    margin: 0 auto var(--space-8);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.join-input {
    width: 100%;
    padding: var(--space-4) var(--space-6);
    font-size: var(--font-size-base);
    border: 2px solid rgba(245, 240, 232, 0.3);
    border-radius: var(--border-radius-full);
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-bg-white);
    outline: none;
    transition: border-color var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast);
}

.join-input::placeholder {
    color: rgba(245, 240, 232, 0.5);
}

.join-input:focus {
    border-color: var(--color-bg-white);
    background: rgba(255, 255, 255, 0.15);
    box-shadow: 0 0 0 4px rgba(245, 240, 232, 0.15);
}

.join-button {
    width: 100%;
    padding: var(--space-4) var(--space-8);
    font-size: var(--font-size-md);
    font-weight: 600;
    letter-spacing: 0.04em;
    color: var(--color-primary);
    background: var(--color-bg-white);
    border-radius: var(--border-radius-full);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
}

.join-button:hover,
.join-button:focus-visible {
    background: var(--color-bg);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

.join-closing {
    font-family: var(--font-heading);
    font-size: var(--font-size-md);
    font-style: italic;
    color: rgba(245, 240, 232, 0.7);
}

/* ============================================================
   11. FOOTER
   ============================================================ */
.site-footer {
    background: var(--color-primary-dark);
    color: var(--color-bg-white);
    padding: var(--space-12) 0;
    text-align: center;
}

.footer-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-4);
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.footer-org {
    font-family: var(--font-heading);
    font-size: var(--font-size-lg);
    font-weight: 700;
    letter-spacing: 0.02em;
}

.footer-url {
    font-size: var(--font-size-sm);
    color: rgba(245, 240, 232, 0.6);
    transition: color var(--transition-fast);
}

.footer-url:hover {
    color: var(--color-bg-white);
}

/* Social icons */
.social-links {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    margin: var(--space-2) 0;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: rgba(245, 240, 232, 0.1);
    color: var(--color-bg-white);
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.social-link:hover,
.social-link:focus-visible {
    background: rgba(245, 240, 232, 0.25);
    transform: translateY(-2px);
}

.social-link svg {
    width: 24px;
    height: 24px;
}

.footer-tagline {
    font-family: var(--font-heading);
    font-size: var(--font-size-sm);
    font-style: italic;
    color: rgba(245, 240, 232, 0.5);
    letter-spacing: 0.08em;
}

/* ============================================================
   12. RESPONSIVE BREAKPOINTS
   ============================================================ */

/* --- Tablet (≥ 768px) --- */
@media (min-width: 768px) {
    /* Nav: show links inline, hide hamburger */
    .nav-toggle {
        display: none;
    }

    .nav-links {
        display: flex !important;
        position: static;
        flex-direction: row;
        background: transparent;
        padding-top: 0;
        gap: var(--space-2);
    }

    .nav-links li a {
        font-family: var(--font-body);
        font-size: var(--font-size-sm);
        font-weight: 500;
        color: var(--color-bg-white);
        padding: var(--space-2) var(--space-4);
        border-radius: var(--border-radius-full);
        letter-spacing: 0.02em;
    }

    .nav-links li a:hover {
        background: rgba(255, 255, 255, 0.12);
        transform: none;
    }

    /* When not scrolled, nav links are white */
    .site-nav:not(.scrolled) .nav-links li a {
        color: var(--color-bg-white);
    }

    /* Hero */
    .hero {
        padding: calc(var(--nav-height) + var(--space-12)) var(--space-6) var(--space-20);
    }

    .hero-logo {
        width: 140px;
        height: 140px;
    }

    .hero h1 {
        font-size: var(--font-size-3xl);
    }

    .tagline {
        font-size: var(--font-size-xl);
    }

    /* About: two-column layout */
    .about-grid {
        flex-direction: row;
        align-items: center;
        gap: var(--space-10);
    }

    .about-image,
    .about-text {
        flex: 1;
        min-width: 0;
    }

    .about-image img {
        height: 360px;
    }

    /* What We Do: 2x2 grid */
    .pillars-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-8);
    }

    /* Help: 2x2 grid */
    .help-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-8);
    }

    /* Join form: inline */
    .form-group {
        flex-direction: row;
    }

    .join-input {
        flex: 1;
    }

    .join-button {
        width: auto;
        padding: var(--space-4) var(--space-10);
        white-space: nowrap;
    }
}

/* --- Desktop (≥ 1024px) --- */
@media (min-width: 1024px) {
    /* Hero */
    .hero h1 {
        font-size: 3.5rem;
    }

    .hero-logo {
        width: 160px;
        height: 160px;
    }

    /* Section headings */
    section h2 {
        font-size: var(--font-size-3xl);
        margin-bottom: var(--space-12);
    }

    /* About: wider image */
    .about-image img {
        height: 400px;
    }

    /* Help: 4-column grid */
    .help-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    /* Pillar cards: wider padding */
    .pillar-card {
        padding: var(--space-10) var(--space-8);
    }

    .help-card {
        padding: var(--space-10) var(--space-8);
    }
}

/* ============================================================
   13. FOCUS VISIBLE STYLES (Accessibility)
   ============================================================ */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* On dark backgrounds, use white focus outline */
.hero :focus-visible,
.join :focus-visible,
.site-footer :focus-visible,
.site-nav.scrolled :focus-visible,
.nav-links.active :focus-visible {
    outline-color: var(--color-bg-white);
}

/* ============================================================
   14. PRINT STYLES
   ============================================================ */
@media print {
    .site-nav,
    .nav-toggle,
    .join-form,
    .social-links {
        display: none !important;
    }

    body {
        color: #000;
        background: #fff;
    }

    .hero {
        min-height: auto;
        padding: 2rem 1rem;
        background: #2D5A3D !important;
        color: #fff !important;
    }

    a {
        color: #000;
    }

    a[href]::after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
        color: #666;
    }
}