/* --- 1. BASE & THEME SETUP --- */
:root {
    /* Light Theme Defaults */
    --color-bg: #f9f9f9;
    --color-surface: #ffffff;
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #555555;
    --color-accent: #007aff; /* Instagram Blue-like */
    --color-border: #e0e0e0;
    --color-shadow: rgba(0, 0, 0, 0.08);
    --color-success: #28a745;
    --color-points: #ffc107;
    --font-family: 'Inter', sans-serif;
}

[data-theme='dark'] {
    --color-bg: #121212;
    --color-surface: #1e1e1e;
    --color-text-primary: #f0f0f0;
    --color-text-secondary: #aaaaaa;
    --color-accent: #3498db; /* Slightly softer blue for dark mode */
    --color-border: #333333;
    --color-shadow: rgba(255, 255, 255, 0.1);
    --color-points: #fdd835;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    transition: background-color 0.3s, color 0.3s;
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 16px;
}

/* --- 2. TYPOGRAPHY & UTILITIES --- */
h1, h2, h3 {
    margin-bottom: 0.5em;
    font-weight: 700;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 16px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: background-color 0.2s, transform 0.1s, box-shadow 0.2s;
    border: 1px solid transparent;
}

.btn:active { transform: scale(0.98); }

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

.btn-primary:hover {
    background-color: #0056b3; /* Darker primary on hover */
}

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

.btn-secondary:hover {
    background-color: var(--color-border);
}

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

.btn-ghost:hover {
    background-color: var(--color-border);
}

.btn-large { padding: 12px 24px; font-size: 1.1rem; }
.btn-small { padding: 6px 12px; font-size: 0.9rem; border-radius: 6px; }
.btn-full { width: 100%; }

/* --- 3. AVATARS & PLACEHOLDERS --- */
.avatar-small, .avatar-medium, .avatar-large {
    border-radius: 50%;
    background-color: var(--color-border);
    background-size: cover;
    background-position: center;
    flex-shrink: 0;
}

.avatar-small { width: 32px; height: 32px; }
.avatar-medium { width: 48px; height: 48px; }
.avatar-large { width: 100px; height: 100px; border: 3px solid var(--color-surface); }

/* --- 4. LANDING PAGE SPECIFIC STYLES --- */
.header-landing {
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 10px 0;
    box-shadow: 0 2px 4px var(--color-shadow);
}

.nav-bar-landing {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo { font-size: 1.8rem; font-weight: 800; color: var(--color-accent); }
.nav-actions .btn { margin-left: 10px; }

.hero-section {
    padding: 80px 0 100px;
    min-height: 70vh;
    display: flex;
    align-items: center;
}

.grid-hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.hero-text h1 { font-size: 3.5rem; line-height: 1.1; }
.tagline { font-size: 1.3rem; color: var(--color-text-secondary); margin-bottom: 30px; max-width: 600px; }
.cta-group .btn { margin-right: 15px; }

/* Mock Feed Preview */
.mock-feed-card {
    background: var(--color-surface);
    border-radius: 15px;
    padding: 15px;
    box-shadow: 0 10px 30px var(--color-shadow);
    border: 1px solid var(--color-border);
    transform: rotate(-3deg) scale(0.95);
    animation: float 6s ease-in-out infinite;
}

.mock-post { padding: 10px; }
.post-header { display: flex; align-items: center; margin-bottom: 10px; }
.user-info { margin-left: 10px; font-size: 0.9rem; }
.username-mock { font-weight: 600; display: block; }
.timestamp-mock { font-size: 0.8rem; color: var(--color-text-secondary); }
.post-content-mock { font-size: 0.95rem; margin-bottom: 10px; }
.post-actions-mock span {
    margin-right: 15px;
    font-size: 0.9rem;
    cursor: pointer;
    color: var(--color-text-secondary);
}

/* Features Bento Grid */
.features-section { padding: 60px 0; background-color: var(--color-bg);
    border-top: 1px solid var(--color-border);
}
.features-section h2 { text-align: center; margin-bottom: 40px; }

.bento-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.bento-item {
    background: var(--color-surface);
    padding: 25px;
    border-radius: 16px;
    box-shadow: 0 4px 12px var(--color-shadow);
    border: 1px solid var(--color-border);
    transition: transform 0.3s, box-shadow 0.3s;
}
.bento-item:hover { transform: translateY(-5px); box-shadow: 0 10px 20px var(--color-shadow); }

.bento-item .icon-large { font-size: 36px; color: var(--color-accent); margin-bottom: 10px; }
.bento-item h3 { font-size: 1.2rem; }
.bento-item.span-2 { grid-column: span 2; }

/* --- 5. AUTH PAGES (Login/Signup) --- */
.auth-page-wrapper {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.auth-container {
    position: relative;
    width: 100%;
    max-width: 400px;
}

.theme-toggle-container-auth { position: absolute; top: -50px; right: 0; }

.auth-box {
    background: var(--color-surface);
    padding: 30px;
    border-radius: 16px;
    box-shadow: 0 10px 30px var(--color-shadow);
    border: 1px solid var(--color-border);
}

.logo-auth { font-size: 2.5rem; font-weight: 900; color: var(--color-accent); text-align: center; margin-bottom: 20px; }

.auth-form h2 { text-align: center; margin-bottom: 25px; font-weight: 600; }

.input-group {
    margin-bottom: 15px;
}

.input-group input {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    transition: border-color 0.2s;
}

.input-group input:focus {
    border-color: var(--color-accent);
    outline: none;
}

.auth-switch { text-align: center; margin-top: 15px; font-size: 0.95rem; }
.auth-switch a { color: var(--color-accent); text-decoration: none; }

/* --- 6. APP SHELL (Feed, Profile, etc.) --- */
.app-shell {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Top Nav */
.top-nav {
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 10px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 1px 5px var(--color-shadow);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-nav { font-size: 1.5rem; font-weight: 800; color: var(--color-accent); }

.search-bar-wrapper {
    display: flex;
    align-items: center;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 6px 12px;
    width: 300px;
    transition: width 0.3s, border-color 0.3s;
}
.search-bar-wrapper:focus-within {
    border-color: var(--color-accent);
    width: 350px;
}

.search-input {
    border: none;
    background: transparent;
    color: var(--color-text-primary);
    outline: none;
    flex-grow: 1;
    padding-left: 8px;
}

.nav-icons {
    display: flex;
    align-items: center;
}

.nav-icon-btn {
    background: none; border: none; cursor: pointer;
    color: var(--color-text-secondary);
    margin-left: 15px;
    position: relative;
    padding: 5px;
    transition: color 0.2s;
}
.nav-icon-btn:hover { color: var(--color-accent); }
.nav-icon-btn .material-icons { font-size: 26px; }
.nav-icon-btn .badge { position: absolute; top: 0; right: -5px; background-color: var(--color-success); color: white; border-radius: 50%; padding: 1px 5px; font-size: 0.6rem; line-height: 1; }

.profile-shortcut .avatar-small { border: none; cursor: pointer; }

/* Main Content Layout */
.feed-container {
    padding-top: 20px;
    padding-bottom: 80px; /* Space for bottom nav */
    max-width: 600px; /* Feed optimization width */
}

.page-title { font-size: 1.8rem; margin-bottom: 20px; }

/* --- 7. POST CARD STYLES (Feed) --- */
.post-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 20px;
    box-shadow: 0 2px 8px var(--color-shadow);
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

.post-card.fade-in-up { opacity: 1; transform: translateY(0); }
.post-card.delay-1 { transition-delay: 0.1s; }

.post-header {
    display: flex;
    align-items: center;
    margin-bottom: 12px;
}

.user-info {
    margin-left: 12px;
    flex-grow: 1;
}
.username { font-weight: 600; color: var(--color-text-primary); text-decoration: none; display: block; }
.timestamp { font-size: 0.85rem; color: var(--color-text-secondary); }

.post-content p {
    margin-bottom: 10px;
    white-space: pre-wrap;
}

.post-image-wrapper { margin-bottom: 10px; border-radius: 8px; overflow: hidden; }
.post-image { width: 100%; height: auto; display: block; object-fit: cover; }

.post-actions {
    display: flex;
    gap: 15px;
    align-items: center;
    padding-top: 8px;
    border-top: 1px solid var(--color-border);
}

.action-btn {
    background: none; border: none; cursor: pointer;
    color: var(--color-text-secondary);
    display: flex; align-items: center; gap: 4px;
    font-size: 0.9rem;
    transition: color 0.2s;
}
.action-btn:hover { color: var(--color-accent); }
.action-btn.liked .material-icons { color: #e74c3c; }

.points-earned { font-size: 0.8rem; color: var(--color-points); font-weight: 700; margin-left: auto; }

/* --- 8. BOTTOM NAVIGATION (Mobile) --- */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: space-around;
    padding: 8px 0;
    z-index: 1000;
    box-shadow: 0 -2px 8px var(--color-shadow);
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--color-text-secondary);
    padding: 5px;
    transition: color 0.2s;
}

.nav-item .material-icons { font-size: 26px; }
.nav-item .nav-text { font-size: 0.7rem; margin-top: 2px; }

.nav-item:hover { color: var(--color-accent); }
.nav-item.active { color: var(--color-accent); font-weight: 600; }

.create-btn { color: var(--color-text-secondary); }
.create-btn:hover { color: var(--color-accent); }

/* --- 9. PROFILE PAGE STYLES --- */
.profile-main {
    padding-top: 20px;
    padding-bottom: 80px; /* Space for bottom nav */
}

.profile-header {
    background: var(--color-surface);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 25px;
    border: 1px solid var(--color-border);
    box-shadow: 0 2px 8px var(--color-shadow);
    opacity: 0; transform: translateY(20px);
    transition: opacity 0.5s, transform 0.5s;
}

.profile-info-top {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
}

.avatar-large {
    width: 100px; height: 100px;
    min-width: 100px;
    margin-right: 25px;
}

.display-name { font-size: 1.8rem; font-weight: 700; margin-bottom: 2px; }
.profile-actions { display: flex; gap: 10px; margin-top: 10px; }

.stats {
    display: flex;
    gap: 30px;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--color-border);
}
.stat-item { text-align: center; }
.stat-value { display: block; font-weight: 700; font-size: 1.1rem; }
.stat-label { font-size: 0.85rem; color: var(--color-text-secondary); }
.points-stat .stat-value { color: var(--color-points); }

/* Tabs */
.profile-tabs { opacity: 0; transform: translateY(20px); transition: opacity 0.5s 0.1s, transform 0.5s 0.1s; }

.tab-navigation {
    display: flex;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 15px;
    overflow-x: auto;
    white-space: nowrap;
}
.tab-link {
    flex-grow: 1;
    padding: 15px 0;
    text-align: center;
    background: none; border: none; cursor: pointer;
    color: var(--color-text-secondary);
    font-weight: 500;
    border-bottom: 2px solid transparent;
    transition: color 0.2s, border-bottom-color 0.2s;
    min-width: 80px; 
}
.tab-link:hover { color: var(--color-text-primary); }
.tab-link.active {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
    font-weight: 600;
}

.tab-content { display: none; }
.tab-content.active { display: block; }

.profile-post-card {
    padding: 12px;
    margin-bottom: 15px;
    box-shadow: none;
    border: 1px solid var(--color-border);
}
.profile-post-card .post-actions { justify-content: flex-start; }

.media-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 5px;
}
.media-item {
    aspect-ratio: 1 / 1;
    background-color: var(--color-border);
    background-size: cover;
    background-position: center;
    border-radius: 4px;
}

.activity-list {
    list-style: none;
    padding: 0;
}
.activity-list li {
    display: flex;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text-secondary);
}
.activity-list li .material-icons { margin-right: 10px; color: var(--color-accent); }

.placeholder-text { color: var(--color-text-secondary); font-style: italic; padding: 20px; text-align: center; border: 1px dashed var(--color-border); border-radius: 8px; }

/* --- 10. EVENTS PAGE STYLES --- */
.event-list { margin-top: 20px; }
.event-card {
    display: flex;
    background: var(--color-surface);
    border-radius: 12px;
    padding: 15px;
    margin-bottom: 15px;
    border: 1px solid var(--color-border);
    box-shadow: 0 2px 6px var(--color-shadow);
    align-items: center;
    opacity: 0; transform: translateY(20px);
    transition: opacity 0.5s, transform 0.5s;
}
.event-card.fade-in-up { opacity: 1; transform: translateY(0); }
.event-card.delay-1 { transition-delay: 0.1s; }

.event-date {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    background-color: var(--color-accent);
    color: white;
    border-radius: 8px;
    margin-right: 15px;
    flex-shrink: 0;
}
.event-date .day { font-size: 1.4rem; font-weight: 800; line-height: 1; }
.event-date .month { font-size: 0.7rem; font-weight: 500; text-transform: uppercase; }

.event-details h3 { font-size: 1.1rem; margin-bottom: 5px; }
.event-details p { font-size: 0.9rem; color: var(--color-text-secondary); display: flex; align-items: center; margin-bottom: 3px; }
.event-details .material-icons { font-size: 16px; margin-right: 5px; }

.event-tags .tag { display: inline-block; background: var(--color-bg); color: var(--color-text-secondary); padding: 3px 8px; border-radius: 15px; font-size: 0.75rem; margin-right: 5px; }

.event-actions {
    margin-left: auto;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 8px;
}
.points-potential { font-size: 0.8rem; color: var(--color-points); font-weight: 600; }

/* --- 11. SEARCH PAGE STYLES --- */
.search-results-section { padding-top: 10px; }
.result-group { margin-bottom: 30px; }
.result-group h4 { font-size: 1.1rem; margin-bottom: 15px; color: var(--color-text-secondary); }

.user-card {
    display: flex;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid var(--color-border);
    transition: background-color 0.2s;
}
.user-card:hover { background-color: rgba(var(--color-border), 0.3); }

.user-info-result { margin-left: 15px; flex-grow: 1; }
.user-info-result .username { font-size: 1.1rem; }
.handle-info { font-size: 0.85rem; color: var(--color-text-secondary); }

.search-post-card {
    margin-bottom: 10px;
    border: 1px dashed var(--color-border);
    box-shadow: none;
}

/* --- 12. THEME TOGGLE --- */
.theme-toggle-btn, .theme-toggle-btn-small {
    background: none; border: 1px solid var(--color-border); color: var(--color-text-secondary);
    border-radius: 50%; cursor: pointer; transition: all 0.3s;
}
.theme-toggle-btn { padding: 10px; width: 44px; height: 44px; }
.theme-toggle-btn-small { padding: 6px; width: 36px; height: 36px; }

.theme-toggle-btn:hover, .theme-toggle-btn-small:hover {
    background-color: var(--color-border);
    color: var(--color-accent);
}

/* --- 13. ANIMATIONS --- */
@keyframes float {
    0% { transform: rotate(-3deg) scale(0.95) translateY(0); }
    50% { transform: rotate(1deg) scale(0.98) translateY(-10px); }
    100% { transform: rotate(-3deg) scale(0.95) translateY(0); }
}

/* --- 14. RESPONSIVENESS --- */

/* Mobile Optimization */
@media (max-width: 1023px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    
    .container { padding: 0 12px; }

    /* Landing Page Adjustments */
    .grid-hero {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .hero-illustration { order: -1; margin-bottom: 30px; }
    .mock-feed-card { transform: none; animation: none; max-width: 350px; margin: 0 auto; }
    .tagline { font-size: 1.1rem; }
    .cta-group { display: flex; flex-direction: column; gap: 10px; align-items: center; }
    .cta-group .btn { margin-right: 0; width: 90%; max-width: 300px; }

    .bento-grid { grid-template-columns: 1fr 1fr; }
    .bento-item.span-2 { grid-column: span 1; }

    /* Navigations */
    .top-nav .logo-nav { font-size: 1.3rem; }
    .top-nav .nav-content { gap: 10px; }
    
    .search-bar-wrapper { width: 100px; transition: none; }
    .search-bar-wrapper:focus-within { width: 100%; }
    .search-input { display: none; }
    .search-bar-wrapper:focus-within .search-input { display: block; padding-left: 5px; }
    .search-bar-wrapper:focus-within { border-radius: 10px; }

    .nav-icon-btn { margin-left: 10px; }

    .bottom-nav { height: 60px; padding: 5px 0; }
    .nav-item .nav-text { display: none; }
    .nav-item .material-icons { font-size: 24px; }

    /* Feed Enhancements: Remove fixed sidebars and adjust layout for mobile flow */
    .feed-container { max-width: 100%; padding-bottom: 60px; }
    
    /* Profile */
    .profile-info-top {
        flex-direction: column;
        text-align: center;
    }
    .avatar-large { margin: 0 auto 15px; width: 90px; height: 90px; }
    .profile-actions { justify-content: center; width: 100%; }
    .stats { justify-content: space-around; }

    /* Events */
    .event-card {
        flex-direction: column;
        align-items: flex-start;
    }
    .event-date { margin-right: 0; margin-bottom: 10px; }
    .event-actions { flex-direction: row; margin-top: 10px; width: 100%; justify-content: space-between; }
    .event-actions .btn { flex-grow: 1; margin-right: 10px; }

    /* Search */
    .active-search .search-input { display: block; }
    .active-search { width: 100% !important; border-color: var(--color-accent); }

    /* Profile Tabs */
    .tab-navigation { justify-content: flex-start; }
    .tab-link { min-width: 100px; padding: 12px 8px; font-size: 0.9rem; }
}

/* Desktop Optimization (Implementing Sidebar/Layout Split) */
@media (min-width: 1024px) {
    .app-shell {
        flex-direction: row;
    }
    .top-nav {
        position: sticky;
        top: 0;
        height: 100vh; 
        width: 250px; 
        border-right: 1px solid var(--color-border);
        border-bottom: none;
        box-shadow: 2px 0 8px var(--color-shadow);
        padding: 20px 0;
    }
    .top-nav .nav-content {
        flex-direction: column;
        justify-content: flex-start;
        align-items: flex-start;
        height: 100%;
        padding: 0 20px;
    }
    .logo-nav { margin-bottom: 40px; }
    .search-bar-wrapper { width: 100%; margin-bottom: 30px; }
    .search-input { display: block !important; }
    .search-bar-wrapper:focus-within { width: 100%; }

    .nav-icons {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
        width: 100%;
    }
    .nav-icon-btn { margin-left: 0; }
    .profile-shortcut { margin-top: 20px; }
    .theme-toggle-btn-small { margin-left: 0; margin-top: 10px; }

    .feed-container {
        flex-grow: 1;
        max-width: 800px; 
        padding-left: 40px; 
        padding-right: 40px;
        padding-bottom: 20px;
    }
    .bottom-nav { display: none; } /* Hide mobile nav on desktop */

    .profile-main {
        flex-grow: 1;
        max-width: 1000px;
        padding-left: 40px;
        padding-right: 40px;
        padding-bottom: 20px;
    }
    .profile-header { padding: 30px; }
}

/* Karbon Sites Branding */

  #karbon-promo-banner {
      position: fixed;
      bottom: 10px;
      right: 10px;
      background-color: rgba(0, 0, 0, 0.8);
      color: white;
      padding: 8px 16px;
      border-radius: 8px;
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
      font-size: 14px;
      z-index: 10000;
      display: flex;
      align-items: center;
      gap: 10px;
      text-decoration: none;
      box-shadow: 0 4px 6px rgba(0,0,0,0.1);
      transition: transform 0.2s ease-in-out;
  }
  #karbon-promo-banner:hover {
      transform: scale(1.05);
  }