/* design tokens */
:root {
    --bg-color: #efebe0; /* warmer, richer beige */
    --text-primary: #193224;
    --text-secondary: #3b604b;
    --text-muted: #738a7c;
    --accent-green: #2a523a;
    --accent-light: #e0dacf; /* matched warmer beige */
    --accent-hover: #48785c;
    --glass-bg: rgba(239, 235, 224, 0.85); /* matched glassbg to warmer beige */
    --border-color: rgba(25, 50, 36, 0.12); /* slightly more visible green-tinted borders */
    --border-hover: rgba(25, 50, 36, 0.22);
    --font-sans: 'Lexend', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --transition-smooth: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

/* global reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-weight: 300;
    line-height: 1.6;
    overflow-x: hidden;
    text-transform: lowercase; /* lowercase vibe */
    position: relative;
    min-height: 100vh;
}

/* hologram canvas background */
#hologram-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 1;
    pointer-events: none;
    transition: opacity 0.5s ease;
}

/* header & navigation */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 10;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    background-color: rgba(239, 235, 224, 0.8);
    border-bottom: 1.5px solid var(--border-color);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.25rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.45rem;
    font-weight: 500;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.03em;
    transition: var(--transition-smooth);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo::before {
    content: '';
    display: inline-block;
    width: 10px;
    height: 10px;
    background-color: var(--accent-green);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--accent-hover);
}

.logo:hover {
    color: var(--accent-green);
    transform: translateY(-1px);
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 400;
    color: var(--text-secondary);
    text-decoration: none;
    position: relative;
    padding: 0.25rem 0;
    transition: var(--transition-smooth);
}

.nav-link:hover {
    color: var(--text-primary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--accent-green);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.nav-link.active {
    color: var(--text-primary);
}

.nav-link.active::after {
    transform: scaleX(1);
    transform-origin: left;
}

/* main content layouts */
.main-content {
    position: relative;
    z-index: 2;
    padding-top: 5rem;
    min-height: calc(100vh - 5rem);
}

.view {
    display: none;
    opacity: 0;
    transform: translateY(15px);
    transition: opacity 0.5s ease, transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.view.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 4rem 2rem 6rem 2rem;
}

.view-header {
    margin-bottom: 4rem;
    max-width: 650px;
    position: relative;
    padding-bottom: 1.5rem;
}

/* decorative green border line under page headers */
.view-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background-color: var(--accent-green);
    border-radius: 2px;
}

.view-title {
    font-size: 2.75rem;
    font-weight: 500;
    color: var(--text-primary);
    letter-spacing: -0.04em;
    margin-bottom: 1rem;
}

.view-desc {
    font-size: 1.15rem;
    color: var(--text-secondary);
    font-weight: 300;
}

/* home view specifics */
.hero-container {
    position: relative;
    width: 100%;
}

.scroll-trigger-space {
    height: 120vh; /* creates space for scroll interaction */
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 5rem;
}

.hero-intro {
    text-align: center;
    z-index: 3;
    pointer-events: none;
    transform: translateY(-20px);
}

.hero-title {
    font-size: 4rem;
    font-weight: 500;
    letter-spacing: -0.05em;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    text-shadow: 0 2px 4px rgba(25, 50, 36, 0.05);
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
    margin-bottom: 2.5rem;
}

.scroll-indicator {
    display: inline-block;
    width: 22px;
    height: 38px;
    border: 1.5px solid var(--accent-green);
    border-radius: 20px;
    position: relative;
}

.scroll-indicator .dot {
    display: block;
    width: 4px;
    height: 8px;
    background-color: var(--accent-green);
    border-radius: 2px;
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll-dot 1.8s ease-in-out infinite;
}

@keyframes scroll-dot {
    0% { transform: translate(-50%, 0); opacity: 0; }
    30% { opacity: 1; }
    80% { transform: translate(-50%, 12px); opacity: 0; }
    100% { transform: translate(-50%, 0); opacity: 0; }
}

.mission-section {
    position: relative;
    padding: 10vh 2rem 25vh 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(180deg, rgba(239, 235, 224, 0) 0%, rgba(239, 235, 224, 0.95) 40%, rgba(239, 235, 224, 1) 100%);
    z-index: 3;
}

.mission-card {
    max-width: 750px;
    text-align: center;
    background-color: var(--glass-bg);
    border: 1.5px solid var(--border-color);
    border-top: 5px solid var(--accent-green); /* solid green top accent border */
    padding: 4rem 3rem;
    border-radius: 24px;
    box-shadow: 0 12px 40px rgba(25, 50, 36, 0.05);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.mission-text {
    font-size: 1.35rem;
    line-height: 1.8;
    color: var(--text-primary);
    margin-bottom: 2.5rem;
    font-weight: 300;
    letter-spacing: -0.01em;
}

/* buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.85rem 1.8rem;
    font-family: var(--font-sans);
    font-size: 0.95rem;
    font-weight: 400;
    text-decoration: none;
    border-radius: 30px;
    transition: var(--transition-smooth);
    cursor: pointer;
}

.btn-primary {
    background-color: var(--text-primary);
    color: var(--bg-color);
    border: 1.5px solid var(--text-primary);
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    border-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(25, 50, 36, 0.15);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border: 1.5px solid var(--text-primary);
}

.btn-secondary:hover {
    background-color: var(--text-primary);
    color: var(--bg-color);
    transform: translateY(-2px);
}

/* research view styling */
.research-container {
    display: flex;
    justify-content: center;
    align-items: center;
    padding-top: 1rem;
}

.research-card {
    background-color: var(--glass-bg);
    border: 1.5px solid var(--border-color);
    border-top: 4px solid var(--accent-green); /* solid green top accent border */
    border-radius: 20px;
    padding: 3.5rem 3rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    width: 100%;
    max-width: 650px;
    transition: var(--transition-smooth);
    box-shadow: 0 8px 32px rgba(25, 50, 36, 0.04);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.research-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-green);
    box-shadow: 0 14px 40px rgba(25, 50, 36, 0.08);
}

.research-message {
    font-size: 1.35rem;
    line-height: 1.8;
    color: var(--text-primary);
    margin-bottom: 2.25rem;
    font-weight: 300;
}

.research-email-link {
    color: var(--accent-green);
    font-weight: 500;
    text-decoration: underline;
    text-underline-offset: 4px;
    transition: var(--transition-smooth);
}

.research-email-link:hover {
    color: var(--accent-hover);
}

.btn-email {
    font-size: 0.95rem;
    padding: 0.85rem 2rem;
}

/* articles view styling */
.articles-grid-centered {
    display: flex;
    justify-content: center;
    align-items: center;
    padding-top: 1rem;
}

.article-card {
    background-color: var(--glass-bg);
    border: 1.5px solid var(--border-color);
    border-top: 4px solid var(--accent-green); /* solid green top accent border */
    border-radius: 20px;
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 550px;
    transition: var(--transition-smooth);
    box-shadow: 0 6px 24px rgba(25, 50, 36, 0.03);
}

.article-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-green);
    box-shadow: 0 12px 35px rgba(25, 50, 36, 0.08);
}

.article-date {
    font-size: 0.8rem;
    font-weight: 400;
    color: var(--text-muted);
    margin-bottom: 1rem;
    letter-spacing: 0.05em;
}

.article-title {
    font-size: 1.55rem;
    font-weight: 500;
    line-height: 1.35;
    color: var(--text-primary);
    margin-bottom: 1.25rem;
    letter-spacing: -0.03em;
}

.article-excerpt {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.6;
    font-weight: 300;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
}

.article-read-time {
    font-size: 0.85rem;
    font-weight: 400;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.article-read-time::before {
    content: '';
    display: inline-block;
    width: 6px;
    height: 6px;
    background-color: var(--accent-green);
    border-radius: 50%;
}

.btn-read {
    font-size: 0.85rem;
    padding: 0.6rem 1.4rem;
    border-color: var(--accent-green);
    color: var(--accent-green);
}

.btn-read:hover {
    background-color: var(--accent-green);
    border-color: var(--accent-green);
    color: var(--bg-color);
}

/* data sources view */
.data-sources-list {
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
}

.source-card {
    background-color: var(--glass-bg);
    border: 1.5px solid var(--border-color);
    border-left: 5px solid var(--accent-green); /* left side green accent border */
    border-radius: 20px;
    padding: 2.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
    transition: var(--transition-smooth);
    box-shadow: 0 4px 20px rgba(25, 50, 36, 0.02);
}

.source-card:hover {
    border-color: var(--accent-green);
    transform: translateX(4px);
    box-shadow: 0 8px 30px rgba(25, 50, 36, 0.06);
}

.source-info {
    max-width: 72%;
}

.source-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--accent-green);
    background-color: rgba(42, 82, 58, 0.08);
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    margin-bottom: 0.75rem;
    letter-spacing: 0.02em;
}

.source-name {
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--text-primary);
    letter-spacing: -0.03em;
    margin-bottom: 0.5rem;
}

.source-description {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 300;
}

/* environmental background graphics */
.environmental-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.env-svg {
    position: absolute;
    opacity: 0.18; /* raised opacity for better visibility */
    transition: var(--transition-smooth);
}

.bird {
    width: 50px; /* larger birds */
    height: auto;
}

.bird-1 {
    top: 15vh;
    left: 15%;
    animation: float-bird 8s ease-in-out infinite;
}

.bird-2 {
    top: 25vh;
    left: 78%;
    width: 40px;
    animation: float-bird 10s ease-in-out infinite 1.5s;
}

.bird-3 {
    top: 38vh;
    left: 28%;
    width: 45px;
    animation: float-bird 9s ease-in-out infinite 0.5s;
}

@keyframes float-bird {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-10px) rotate(3deg); }
}

.tree {
    width: 130px; /* much larger trees */
    height: auto;
}

.tree-left {
    left: 5%;
    bottom: 25vh;
}

.tree-right {
    right: 5%;
    bottom: 40vh;
    width: 110px;
}

.deer-silhouette {
    width: 75px; /* larger animal silhouette */
    height: auto;
    left: 12%;
    bottom: 8vh; /* stands near the mission section */
}

/* footer */
.site-footer {
    border-top: 1.5px solid var(--border-color);
    padding: 3.5rem 2rem;
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
    position: relative;
    z-index: 2;
}

/* mobile responsiveness */
@media (max-width: 768px) {
    .header-container {
        padding: 1rem 1.5rem;
    }
    
    .nav-links {
        gap: 1.25rem;
    }
    
    .hero-title {
        font-size: 2.75rem;
    }
    
    .view-title {
        font-size: 2rem;
    }
    
    .mission-text {
        font-size: 1.15rem;
    }
    
    .source-card {
        flex-direction: column;
        align-items: flex-start;
        gap: 1.5rem;
    }
    
    .source-info {
        max-width: 100%;
    }

    .tree, .deer-silhouette {
        display: none; /* hide decoration vectors on small screens for cleaner fit */
    }
}