:root {
    --bg-color: #000000;
    --sidebar-color: #0a0a0a;
    --card-bg: rgba(255, 255, 255, 0.05);
    --border-color: #2f3336;
    --text-primary: #e7e9ea;
    --text-secondary: #71767b;
    --accent-color: #1d9bf0;
    --accent-glow: rgba(29, 155, 240, 0.3);
    --neon-purple: #bc13fe;
    --glass-blur: blur(12px);
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    display: flex;
    justify-content: center;
    height: 100vh;
    overflow: hidden;
}

#app-container {
    display: grid;
    grid-template-columns: 275px 600px 350px;
    width: 100%;
    max-width: 1250px;
    height: 100%;
}

/* Sidebar */
nav {
    border-right: 1px solid var(--border-color);
    padding: 12px 20px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.logo {
    font-size: 2rem;
    font-weight: 900;
    letter-spacing: -2px;
    color: var(--text-primary);
    text-shadow: 0 0 10px var(--accent-glow);
    margin-bottom: 20px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 1.25rem;
    padding: 12px;
    border-radius: 9999px;
    transition: background 0.2s;
    cursor: pointer;
}

.nav-link:hover {
    background: var(--card-bg);
}

.nav-link.active {
    font-weight: bold;
    color: var(--accent-color);
}

.unread-badge {
    position: absolute;
    top: -2px;
    right: -10px;
    background: var(--accent-color);
    color: white;
    font-size: 0.7rem;
    padding: 2px 6px;
    border-radius: 999px;
    min-width: 18px;
    text-align: center;
    border: 2px solid var(--bg-color);
}

/* Main Feed */
main {
    overflow-y: scroll;
    scrollbar-width: none;
}

main::-webkit-scrollbar {
    display: none;
}

.feed-header {
    position: sticky;
    top: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: var(--glass-blur);
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    z-index: 10;
}

.composer {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    gap: 12px;
}

.avatar-container img {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: #333;
    object-fit: cover;
}

.avatar-container.clickable {
    cursor: pointer;
    position: relative;
    transition: transform 0.2s;
}

.avatar-container.clickable:hover {
    transform: scale(1.05);
}

.avatar-container.clickable:hover::after {
    content: 'Change';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.6rem;
    color: var(--accent-color);
    background: black;
    padding: 2px 4px;
    border-radius: 4px;
}

.composer-content {
    flex-grow: 1;
}

textarea {
    width: 100%;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1.25rem;
    resize: none;
    outline: none;
    padding-top: 8px;
    min-height: 100px;
}

.composer-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
}

button.post-btn {
    background: var(--accent-color);
    color: white;
    border: none;
    padding: 10px 24px;
    border-radius: 9999px;
    font-weight: bold;
    font-size: 1rem;
    cursor: pointer;
    transition: transform 0.1s, opacity 0.2s;
}

button.post-btn:hover {
    opacity: 0.9;
}

button.post-btn:active {
    transform: scale(0.95);
}

/* Post Card */
.post {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    gap: 12px;
    transition: background 0.2s;
    cursor: pointer;
}

.post:hover {
    background: rgba(255, 255, 255, 0.02);
}

.post-header {
    display: flex;
    gap: 4px;
    margin-bottom: 4px;
}

.display-name {
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 4px;
}

.verified-badge {
    color: var(--accent-color);
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
}

.username {
    color: var(--text-secondary);
}

.post-body {
    font-size: 1rem;
    line-height: 1.5;
    margin-bottom: 12px;
}

.post-image {
    width: 100%;
    max-height: 500px;
    object-fit: cover;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    margin-bottom: 12px;
}

.icon-btn {
    cursor: pointer;
    font-size: 1.25rem;
    padding: 8px;
    border-radius: 50%;
    transition: background 0.2s;
}

.icon-btn:hover {
    background: var(--card-bg);
}

.post-actions {
    display: flex;
    justify-content: space-between;
    max-width: 425px;
    color: var(--text-secondary);
}

.reply-list {
    margin-top: 12px;
    padding-left: 20px;
    border-left: 2px solid var(--border-color);
    display: none;
}

.reply-item {
    padding: 12px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.reply-item:last-child {
    border-bottom: none;
}

.reply-composer {
    margin-top: 12px;
    display: none;
    background: rgba(255, 255, 255, 0.02);
    padding: 12px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.reply-composer textarea {
    width: 100%;
    background: transparent;
    border: none;
    color: var(--text-color);
    font-family: inherit;
    resize: none;
    margin-bottom: 8px;
    min-height: 60px;
}

.reply-composer .composer-actions {
    display: flex;
    justify-content: flex-end;
}

.action-item {
    display: flex;
    align-items: center;
    gap: 8px;
    transition: color 0.2s;
}

.action-item:hover {
    color: var(--accent-color);
}

.action-item.like:hover {
    color: #f91880;
}

/* Quoted Post */
.quoted-post {
    margin-top: 12px;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 12px;
    background: rgba(255, 255, 255, 0.02);
    transition: background 0.2s;
}

.quoted-post:hover {
    background: rgba(255, 255, 255, 0.05);
}

.quoted-post .post-header {
    font-size: 0.9rem;
}

.quoted-post .post-body {
    font-size: 0.95rem;
    margin-bottom: 0;
}

.quote-indicator {
    background: var(--accent-glow);
    padding: 8px 12px;
    border-radius: 12px;
    margin-bottom: 12px;
    display: none;
    justify-content: space-between;
    align-items: center;
    border: 1px solid var(--accent-color);
}

/* Messaging Layout */
#messages-layout {
    display: grid;
    grid-template-columns: 200px 1fr;
    height: calc(100vh - 65px);
}

@media (min-width: 1000px) {
    #messages-layout {
        grid-template-columns: 250px 1fr;
    }
}

#conversations-sidebar {
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

#conv-items {
    flex-grow: 1;
    overflow-y: auto;
}

#chat-window {
    display: flex;
    flex-direction: column;
    background: var(--bg-color);
}

#chat-header {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    font-weight: bold;
    font-size: 1.1rem;
    color: var(--text-primary);
}

#message-history {
    flex-grow: 1;
    overflow-y: auto;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

#msg-composer {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 12px;
    align-items: center;
}

#msg-input {
    flex-grow: 1;
    background: #202327;
    border: 1px solid transparent;
    border-radius: 9999px;
    padding: 12px 20px;
    color: white;
    outline: none;
    font-size: 1rem;
}

#msg-input:focus {
    border-color: var(--accent-color);
}

.message-bubble {
    max-width: 75%;
    padding: 12px 18px;
    border-radius: 20px;
    font-size: 0.95rem;
    line-height: 1.5;
    word-wrap: break-word;
}

.message-bubble.sent {
    align-self: flex-end;
    background: var(--accent-color);
    color: white;
    border-bottom-right-radius: 4px;
}

.message-bubble.received {
    align-self: flex-start;
    background: #2f3336;
    color: white;
    border-bottom-left-radius: 4px;
}

.conv-item {
    padding: 16px;
    display: flex;
    gap: 12px;
    align-items: center;
    cursor: pointer;
    transition: background 0.2s;
    position: relative;
    border-bottom: 1px solid rgba(255, 255, 255, 0.02);
}

.conv-item:hover {
    background: rgba(255, 255, 255, 0.03);
}

.conv-item.active {
    background: rgba(255, 255, 255, 0.05);
    border-right: 2px solid var(--accent-color);
}

.conv-item img {
    width: 44px;
    height: 44px;
    border-radius: 50%;
}

.conv-item .unread-badge {
    position: static;
    margin-left: auto;
    border: none;
    padding: 2px 8px;
}

/* Right Sidebar */
aside {
    padding: 12px 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    border-left: 1px solid var(--border-color);
}

.search-bar {
    background: #202327;
    border-radius: 9999px;
    padding: 12px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.search-bar input {
    background: transparent;
    border: none;
    color: var(--text-primary);
    width: 100%;
    outline: none;
}

.widget {
    background: #16181c;
    border-radius: 16px;
    padding: 16px;
}

.widget h2 {
    font-size: 1.25rem;
    margin-bottom: 16px;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.post,
.message-bubble {
    animation: fadeIn 0.3s ease-out;
}

/* Modal and Auth */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background: rgba(22, 24, 28, 0.8);
    border: 1px solid var(--border-color);
    padding: 2rem;
    border-radius: 24px;
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.modal-content input {
    width: 100%;
    padding: 12px;
    margin: 8px 0;
    background: #000;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: white;
}

.modal-content button {
    width: 100%;
    margin-top: 16px;
}

.link {
    color: var(--accent-color);
    cursor: pointer;
    text-decoration: underline;
}

.error-text {
    color: #f4212e;
    margin-bottom: 12px;
    font-size: 0.9rem;
}

.glass {
    backdrop-filter: var(--glass-blur);
}

.logout-btn {
    font-size: 0.8rem;
    color: var(--text-secondary);
    cursor: pointer;
    margin-top: 4px;
}

.logout-btn:hover {
    color: #f4212e;
}