:root {
    --bg-dark: #07090e;
    --card-bg: rgba(22, 26, 34, 0.65);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.2);
    
    --primary: #6366f1;
    --primary-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
    --accent: #22d3ee;
    
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    
    --error: #ef4444;
    --success: #10b981;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Plus Jakarta Sans', sans-serif;
    -webkit-font-smoothing: antialiased;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

.bg-glow {
    position: fixed;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.15;
    z-index: -1;
    pointer-events: none;
}

.bg-glow-1 {
    background: var(--primary);
    top: -100px;
    left: -100px;
}

.bg-glow-2 {
    background: var(--accent);
    bottom: -150px;
    right: -100px;
}

.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px 20px;
}

.main-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    margin-bottom: 40px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 38px;
    height: 38px;
    background: var(--primary-gradient);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon i {
    width: 20px;
    height: 20px;
    color: #fff;
}

.logo-section h1 {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.logo-section h1 span {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
}

.btn-sm {
    padding: 8px 14px;
    font-size: 13px;
    border-radius: 10px;
}

.btn-primary {
    background: var(--primary-gradient);
    color: #fff;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.6);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--border-hover);
}

.btn-outline {
    background: transparent;
    border: 1px solid rgba(239, 68, 68, 0.4);
    color: #ef4444;
}

.btn-outline:hover {
    background: rgba(239, 68, 68, 0.1);
    border-color: #ef4444;
}

.btn-full-width {
    width: 100%;
    padding: 12px;
}

.profile-widget {
    display: flex;
    align-items: center;
    gap: 16px;
}

.welcome-text {
    font-size: 14px;
    color: var(--text-secondary);
}

.welcome-text strong {
    color: var(--text-primary);
}

.feed-hero {
    text-align: center;
    margin-bottom: 40px;
}

.feed-hero h2 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

.feed-hero p {
    color: var(--text-secondary);
    font-size: 16px;
}

.timeline-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

.post-card {
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.post-card:hover {
    transform: translateY(-6px);
    border-color: rgba(99, 102, 241, 0.3);
    box-shadow: 0 15px 40px rgba(99, 102, 241, 0.15);
}

.post-media-container {
    width: 100%;
    aspect-ratio: 4/3;
    overflow: hidden;
    position: relative;
    background: #000;
}

.post-media-container img, 
.post-media-container video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.post-card:hover .post-media-container img {
    transform: scale(1.04);
}

.post-info-container {
    padding: 16px 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    flex-grow: 1;
}

.post-caption {
    font-size: 15px;
    line-height: 1.5;
    color: var(--text-primary);
    word-break: break-word;
}

.post-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--text-muted);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 12px;
    margin-top: auto;
}

.post-meta i {
    width: 14px;
    height: 14px;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(5, 7, 11, 0.85);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.modal-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-card {
    background: #0f1219;
    border: 1px solid var(--border-color);
    border-radius: 24px;
    width: 100%;
    max-width: 460px;
    padding: 32px;
    position: relative;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    transform: translateY(0);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal-overlay.hidden .modal-card {
    transform: translateY(20px);
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 20px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    transition: color 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 24px;
    letter-spacing: -0.5px;
}

.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-wrapper i {
    position: absolute;
    left: 14px;
    width: 18px;
    height: 18px;
    color: var(--text-muted);
    pointer-events: none;
}

.input-wrapper input, .input-group textarea {
    width: 100%;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    padding: 12px 14px 12px 42px;
    font-size: 14px;
    outline: none;
    transition: all 0.2s;
}

.input-group textarea {
    padding: 12px 14px;
    resize: none;
}

.input-wrapper input:focus, .input-group textarea:focus {
    border-color: var(--primary);
    background: rgba(255, 255, 255, 0.05);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.15);
}

.drop-zone {
    border: 2px dashed rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 30px 20px;
    text-align: center;
    background: rgba(255, 255, 255, 0.01);
    cursor: pointer;
    transition: all 0.25s;
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.drop-zone:hover, .drop-zone.dragover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.04);
}

.drop-zone-icon {
    width: 48px;
    height: 48px;
    color: var(--text-muted);
    transition: color 0.25s;
}

.drop-zone:hover .drop-zone-icon, .drop-zone.dragover .drop-zone-icon {
    color: var(--primary);
}

.drop-zone-text {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.drop-zone-info {
    font-size: 11px;
    color: var(--text-muted);
}

.hidden-input {
    display: none;
}

.preview-container {
    margin-bottom: 20px;
}

.preview-wrapper {
    position: relative;
    width: 100%;
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.preview-wrapper img, .preview-wrapper video {
    width: 100%;
    display: block;
    aspect-ratio: 16/10;
    object-fit: cover;
}

.remove-preview-btn {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 36px;
    height: 36px;
    background: rgba(239, 68, 68, 0.9);
    border: none;
    border-radius: 50%;
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
    transition: transform 0.2s;
}

.remove-preview-btn:hover {
    transform: scale(1.1);
}

.auth-tabs {
    display: flex;
    gap: 16px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 24px;
}

.auth-tab {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 16px;
    font-weight: 600;
    padding-bottom: 12px;
    cursor: pointer;
    position: relative;
    outline: none;
}

.auth-tab.active {
    color: var(--text-primary);
}

.auth-tab.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary-gradient);
}

.auth-error-msg {
    color: var(--error);
    font-size: 13px;
    margin-bottom: 16px;
    text-align: center;
    display: none;
}

.skeleton-card {
    height: 340px;
    background: linear-gradient(90deg, rgba(22, 26, 34, 0.5) 25%, rgba(32, 38, 48, 0.5) 50%, rgba(22, 26, 34, 0.5) 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
    border-radius: 20px;
    border: 1px solid var(--border-color);
}

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

.hidden {
    display: none !important;
}

.loader {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px 20px;
    background: rgba(22, 26, 34, 0.3);
    border-radius: 20px;
    border: 1px dotted var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.empty-state i {
    width: 48px;
    height: 48px;
    color: var(--text-muted);
}

.empty-state h3 {
    font-size: 18px;
}

.empty-state p {
    color: var(--text-muted);
    font-size: 14px;
}