/* Trip Memories Platform - Core Stylesheet */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --bg-primary: #FFFFFF;
    --bg-secondary: #F8F9FA;
    --text-primary: #111111;
    --text-secondary: #666666;
    --border-color: #E5E5E5;
    --accent: #1A73E8;
    --success: #22C55E;
    --danger: #EF4444;
    --warning: #F59E0B;
    
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.1);
    
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    
    --transition-smooth: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-fast: all 0.15s ease;
}

/* Dark Mode Architecture (CSS variables override) */
[data-theme="dark"] {
    --bg-primary: #0B0F19;
    --bg-secondary: #161E2E;
    --text-primary: #F9FAFB;
    --text-secondary: #9CA3AF;
    --border-color: #2D3748;
    --accent: #38BDF8;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.5);
}

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

body {
    font-family: var(--font-primary);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    overflow-x: hidden;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Navigation Layout */
.app-container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 260px;
    background-color: var(--bg-primary);
    border-right: 1px solid var(--border-color);
    padding: 2.5rem 1.5rem;
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 100;
    transition: var(--transition-smooth);
}

.sidebar-logo {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    margin-bottom: 3rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sidebar-menu {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.85rem 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: var(--transition-fast);
}

.sidebar-link:hover, .sidebar-link.active {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

.sidebar-link.active {
    font-weight: 600;
    border-left: 3px solid var(--accent);
    border-radius-top-left: 0;
    border-radius-bottom-left: 0;
}

.main-content {
    flex: 1;
    margin-left: 260px;
    padding: 3rem 4rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: var(--transition-smooth);
}

/* Auth Screens Layout */
.auth-container {
    max-width: 440px;
    width: 100%;
    margin: 8vh auto;
    padding: 3rem;
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

/* Premium Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--text-primary);
    font-weight: 700;
    letter-spacing: -0.02em;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

h2 {
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
}

p {
    color: var(--text-secondary);
}

/* Form Inputs */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    display: block;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-control {
    width: 100%;
    padding: 0.85rem 1.2rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: 0.95rem;
    transition: var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--text-primary);
    box-shadow: 0 0 0 3px rgba(15, 23, 42, 0.05);
}

/* Premium Buttons */
.btn-premium {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background-color: var(--accent);
    color: #FFFFFF;
    border: none;
    padding: 0.85rem 1.75rem;
    font-weight: 500;
    font-size: 0.95rem;
    border-radius: 50px;
    cursor: pointer;
    transition: var(--transition-smooth);
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.1);
}

.btn-premium:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(15, 23, 42, 0.18);
}

.btn-premium-secondary {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.btn-premium-secondary:hover {
    background-color: var(--bg-secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-danger-premium {
    background-color: var(--danger);
    color: #FFFFFF;
}

.btn-danger-premium:hover {
    box-shadow: 0 8px 20px rgba(239, 68, 68, 0.25);
}

/* Premium Cards */
.card-premium {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    padding: 2rem;
    transition: var(--transition-smooth);
    overflow: hidden;
}

.card-premium:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
}

/* Masonry Pinterest Gallery Grid */
.gallery-grid {
    column-count: 3;
    column-gap: 1.5rem;
    width: 100%;
}

@media (max-width: 1200px) {
    .gallery-grid {
        column-count: 2;
    }
}

@media (max-width: 768px) {
    .gallery-grid {
        column-count: 1;
    }
}

.gallery-item {
    background-color: var(--bg-primary);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: 1.5rem;
    display: inline-block;
    width: 100%;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-smooth);
    position: relative;
    cursor: pointer;
}

.gallery-item img, .gallery-item video {
    width: 100%;
    display: block;
    object-fit: cover;
    max-height: 450px;
    transition: var(--transition-smooth);
}

.gallery-item:hover img, .gallery-item:hover video {
    transform: scale(1.03);
}

.gallery-info-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.85) 0%, rgba(0,0,0,0) 100%);
    padding: 1.5rem;
    color: #FFFFFF;
    opacity: 0;
    transition: var(--transition-fast);
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}

.gallery-item:hover .gallery-info-overlay {
    opacity: 1;
}

.gallery-overlay-text h4 {
    color: #FFFFFF;
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 0.2rem;
}

.gallery-overlay-text p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.8rem;
    margin: 0;
}

/* Lightbox Modal (Glassmorphism) */
.lightbox-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(15, 23, 42, 0.92);
    backdrop-filter: blur(15px);
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
}

.lightbox-content {
    display: flex;
    max-width: 85vw;
    max-height: 85vh;
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.lightbox-media-container {
    flex: 2;
    background-color: #000000;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    min-height: 500px;
    max-width: 65vw;
}

.lightbox-media-container img, .lightbox-media-container video {
    max-width: 100%;
    max-height: 80vh;
    object-fit: contain;
}

.lightbox-details-panel {
    flex: 1;
    min-width: 320px;
    max-width: 400px;
    padding: 2.5rem;
    background-color: var(--bg-primary);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    border-left: 1px solid var(--border-color);
}

.lightbox-close-btn {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: rgba(255, 255, 255, 0.15);
    color: #FFFFFF;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
}

.lightbox-close-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.05);
}

/* Animations */
.animate-fade-in {
    animation: fadeIn 0.4s ease-out forwards;
}

.animate-slide-up {
    animation: slideUp 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Skeleton Loading Screen */
.skeleton {
    background: linear-gradient(90deg, var(--bg-secondary) 25%, var(--border-color) 50%, var(--bg-secondary) 75%);
    background-size: 200% 100%;
    animation: loadingSkeleton 1.5s infinite;
    border-radius: var(--radius-md);
}

@keyframes loadingSkeleton {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Custom dashboard styles */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.stat-num {
    font-size: 2.5rem;
    font-weight: 700;
    margin: 0.5rem 0;
}

.activity-timeline {
    position: relative;
    padding-left: 2rem;
    border-left: 2px solid var(--border-color);
}

.activity-item {
    position: relative;
    margin-bottom: 2rem;
}

.activity-item::before {
    content: '';
    position: absolute;
    left: -2.4rem;
    top: 0.25rem;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--accent);
    border: 2px solid var(--bg-primary);
}

/* Quick Action Controls */
.quick-action-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    cursor: pointer;
}

.quick-action-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background-color: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    font-size: 1.25rem;
    transition: var(--transition-fast);
}

.quick-action-card:hover .quick-action-icon {
    background-color: var(--accent);
    color: #FFFFFF;
}

/* Responsive Overrides */
@media (max-width: 992px) {
    .sidebar {
        width: 80px;
        padding: 2rem 0.5rem;
        align-items: center;
        top: 64px;
        height: calc(100vh - 64px);
    }
    
    .sidebar-logo span, .sidebar-link span {
        display: none;
    }
    
    .main-content {
        margin-left: 80px;
        padding: 84px 1.5rem 3rem 1.5rem;
    }
    
    .sidebar-logo {
        margin-bottom: 4rem;
        justify-content: center;
    }
}

@media (max-width: 768px) {
    /* Lightbox Stacking for Mobile/Tablets */
    .lightbox-content {
        flex-direction: column;
        max-width: 95vw;
        max-height: 90vh;
        overflow-y: auto;
    }
    .lightbox-media-container {
        max-width: 100%;
        min-height: 300px;
        height: 45vh;
    }
    .lightbox-details-panel {
        max-width: 100%;
        min-width: 100%;
        border-left: none;
        border-top: 1px solid var(--border-color);
        padding: 1.5rem;
    }
}

@media (max-width: 576px) {
    .app-container {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        height: 60px;
        position: fixed;
        bottom: 0;
        top: auto;
        flex-direction: row;
        justify-content: space-around;
        padding: 0;
        border-right: none;
        border-top: 1px solid var(--border-color);
        z-index: 1000;
    }
    .sidebar-logo {
        display: none;
    }
    .sidebar-menu {
        flex-direction: row;
        width: 100%;
        justify-content: space-around;
        gap: 0;
        margin-bottom: 0;
        padding-left: 0;
    }
    .sidebar-link {
        padding: 0.5rem;
        border-radius: 0;
    }
    .main-content {
        margin-left: 0;
        padding: 80px 1rem 80px 1rem; /* Clear top header and leave room for bottom sidebar */
    }
    
    /* Top Header Adjustments */
    .photos-header {
        padding: 0 0.75rem;
    }
    .header-title {
        display: none; /* Make room for search */
    }
    .header-center {
        margin: 0 0.5rem;
    }
    .header-search-container {
        height: 40px;
        padding: 0 0.5rem;
    }
    
    /* Auth Form Adjustments */
    .auth-container {
        padding: 1.5rem;
        margin: 4vh auto;
        box-shadow: none;
        border: none;
        background: transparent;
    }
}

/* ==========================================
   Google Photos UI Styles & Timeline Grid
   ========================================== */

.photos-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 64px;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
    z-index: 1500;
    transition: var(--transition-smooth);
}

.header-left {
    display: flex;
    align-items: center;
}

.header-logo-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
}

/* Beautiful Google Photos CSS Fan Logo */
.logo-fan {
    width: 24px;
    height: 24px;
    position: relative;
    transform: rotate(0deg);
    transition: var(--transition-smooth);
}

.header-logo-link:hover .logo-fan {
    transform: rotate(90deg);
}

.fan-leaf {
    position: absolute;
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.leaf-blue {
    background-color: #4285F4;
    top: 0;
    left: 0;
    border-bottom-left-radius: 0;
}

.leaf-red {
    background-color: #EA4335;
    top: 0;
    right: 0;
    border-bottom-right-radius: 0;
}

.leaf-yellow {
    background-color: #FBBC05;
    bottom: 0;
    right: 0;
    border-top-right-radius: 0;
}

.leaf-green {
    background-color: #34A853;
    bottom: 0;
    left: 0;
    border-top-left-radius: 0;
}

.header-title {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--text-primary);
}

.header-center {
    flex: 1;
    display: flex;
    justify-content: center;
    max-width: 720px;
    margin: 0 2rem;
}

.header-search-container {
    width: 100%;
    height: 48px;
    background-color: var(--bg-secondary);
    border-radius: 8px;
    display: flex;
    align-items: center;
    padding: 0 1rem;
    transition: var(--transition-fast);
}

.header-search-container:focus-within {
    background-color: var(--bg-primary);
    box-shadow: 0 1px 1px 0 rgba(65,69,73,0.3), 0 1px 3px 1px rgba(65,69,73,0.15);
}

.search-icon {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-right: 0.75rem;
}

#global-search-input {
    border: none;
    background: transparent;
    width: 100%;
    outline: none;
    font-size: 1rem;
    color: var(--text-primary);
}

.header-right {
    display: flex;
    align-items: center;
}

.user-profile-trigger {
    cursor: pointer;
    border-radius: 50%;
    padding: 2px;
    transition: var(--transition-fast);
}

.user-profile-trigger:hover {
    background-color: var(--bg-secondary);
}

.profile-avatar-small {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--accent);
    color: #FFFFFF;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
    overflow: hidden;
}

.profile-avatar-small img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Sidebar and Main layout shifts for Top Header */
.sidebar {
    top: 64px;
    height: calc(100vh - 64px);
    width: 240px;
    padding: 1.5rem 1rem;
}

.main-content {
    margin-left: 240px;
    padding: 84px 3rem 3rem 3rem; /* padding-top shifted to clear the header */
}

/* Google-style Active Navigation */
.sidebar-link.active {
    background-color: rgba(26, 115, 232, 0.08);
    color: var(--accent) !important;
    border-left: none;
    border-radius: var(--radius-md);
}

/* Timeline grid date groupings */
.timeline-group {
    margin-bottom: 2.5rem;
}

.timeline-date-header {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.google-signin-btn-container {
    display: flex;
    justify-content: center;
    margin-top: 1.5rem;
    border: 1px solid var(--border-color);
    padding: 0.75rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    background-color: #FFFFFF;
    transition: var(--transition-fast);
}

.google-signin-btn-container:hover {
    background-color: var(--bg-secondary);
}

.google-signin-btn-container img {
    width: 20px;
    height: 20px;
    margin-right: 0.75rem;
}

.google-config-alert {
    background-color: #EFF6FF;
    border: 1px dashed #BFDBFE;
    color: #1E3A8A;
    font-size: 0.8rem;
    padding: 1rem;
    border-radius: var(--radius-md);
    margin-top: 1.5rem;
}