:root {
    --bg-color: #f5f8fa;
    --text-color: #14171a;
    --header-bg: white;
    --card-bg: white;
    --border-color: #e1e8ed;
    --topic-bg: #e8f5fe;
    --topic-active-bg: #1da1f2;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --error-color: #e0245e;
}

.dark-mode {
    --bg-color: #000000;
    --text-color: #e7e9ea;
    --header-bg: #15202b;
    --card-bg: #15202b;
    --border-color: #38444d;
    --topic-bg: #1e3a5f;
    --topic-active-bg: #1da1f2;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --error-color: #f04864;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
    /* Flex layout to keep footer at bottom */
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    background-color: var(--header-bg);
    border-bottom: 1px solid var(--border-color);
    width: 100%;
    box-sizing: border-box;
    position: sticky;
    top: 0;
    left: 0;
    z-index: 10;
}

.header-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: bold;
    color: #1da1f2;
    flex: 1 1 auto;
    min-width: 150px;
    cursor: pointer;
    text-decoration: none;
}

.header-logo:hover {
    opacity: 0.8;
}

.logo-image {
    height: 32px;
    width: 32px;
    object-fit: contain;
}


.container {
    /* Allow container to expand and push footer down */
    flex: 1 0 auto;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    width: 100%;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    color: #1da1f2;
    flex: 1 1 auto;
    min-width: 150px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 15px;
    flex: 0 0 auto;
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--topic-active-bg);
    cursor: pointer;
}

.topics {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 15px;
    overflow-x: auto;
    padding-bottom: 5px;
}

.topic-link {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 700;
    padding: 8px 12px;
    border-radius: 20px;
    background-color: var(--topic-bg);
    transition: background-color 0.2s;
    white-space: nowrap;
    flex-shrink: 0;
}

.topic-link.active {
    background-color: var(--topic-active-bg);
    color: white;
}

.topic-link:hover {
    background-color: var(--topic-bg);
    opacity: 0.9;
}

.topics-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 15px;
}

.topics {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-bottom: 10px;
    width: 100%;
    overflow-x: auto;
    padding-bottom: 5px;
}

.topic-description {
    text-align: center;
    color: var(--text-color);
    max-width: 600px;
    margin: 0 auto;
    padding: 0 20px;
    font-size: 14px;
    line-height: 1.4;
    color: #657786;
}

.posts {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.post {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 15px;
    box-shadow: 0 1px 3px var(--shadow-color);
    word-wrap: break-word;
    position: relative;
}

.post .delete-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background: none;
    border: none;
    width: 24px;
    height: 24px;
    font-size: 16px;
    color: var(--text-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.7;
    transition: opacity 0.2s, transform 0.2s;
    z-index: 1;
    background-color: transparent !important;
    padding: 0 !important;
    border: none !important;
}

/* Ensure footer stays at the bottom of the page */
footer {
    margin-top: auto;
}

/* Hide the text content of the delete button */
.post .delete-btn::before {
    content: "×";
    font-size: 18px;
    line-height: 1;
    color: var(--text-color);
    font-weight: bold;
}

/* Make sure the delete button doesn't show any text */
.post .delete-btn span {
    display: none;
}

/* Add hover effect */
.post .delete-btn:hover {
    opacity: 1;
    transform: scale(1.1);
}

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

.post-header {
    display: flex;
    align-items: center;
    margin-bottom: 10px;
    position: relative;
}

.avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    margin-right: 10px;
    background-color: var(--border-color);
    object-fit: cover;
}

/* Profile avatar styling – mirrors the inline styles in index.html */
#profile-avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--topic-active-bg);
    margin-bottom: 12px;
}

/* Fallback styling for the transparent placeholder image used when a user has no avatar.
   The placeholder is a 1×1 transparent GIF, so we ensure the avatar element still
   displays a visible background (border colour) instead of showing a broken image.
   This rule matches any <img> whose src contains the data‑URI placeholder.
*/
img.avatar[src*="data:image/gif"] {
    background-color: var(--border-color);
    /* Optional: add a subtle pattern or colour if desired */
}

.user-info {
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.username {
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.post-content {
    color: var(--text-color);
    line-height: 1.4;
    margin-bottom: 10px;
    word-wrap: break-word;
    overflow-wrap: break-word;
    overflow: hidden;
}

.post-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #657786;
    font-size: 14px;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 10px;
}

.action {
    display: flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
}

.action-count {
    font-weight: 700;
}

.reply-btn {
    background-color: var(--topic-bg);
    color: var(--text-color);
    border: none;
    border-radius: 20px;
    padding: 6px 12px;
    font-weight: 700;
    cursor: pointer;
    transition: background-color 0.2s;
    font-size: 14px;
}

.reply-btn:hover {
    background-color: var(--topic-bg);
    opacity: 0.9;
}

/* Dropdown styles */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-btn {
    background-color: var(--topic-bg);
    color: var(--text-color);
    padding: 8px 12px;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 5px;
}

.dropdown-btn:hover {
    background-color: var(--topic-bg);
    opacity: 0.9;
}

.dropdown-content {
    display: none;
    position: absolute;
    right: 0;
    background-color: var(--card-bg);
    min-width: 250px;
    box-shadow: 0 8px 16px var(--shadow-color);
    border-radius: 12px;
    z-index: 1;
    margin-top: 5px;
}

.dropdown-content a {
    color: var(--text-color);
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    border-bottom: 1px solid var(--border-color);
    font-size: 14px;
    font-weight: normal;
}

.dropdown-content a:hover {
    background-color: var(--topic-bg);
}

.dropdown-content a:last-child {
    border-bottom: none;
}

.dropdown.show .dropdown-content {
    display: block;
}

/* Hamburger icon for dropdown button */
.hamburger-icon {
    display: flex;
    flex-direction: column;
    width: 20px;
    height: 15px;
    justify-content: space-between;
}

.hamburger-icon span {
    height: 2px;
    background-color: var(--text-color);
    border-radius: 1px;
}

/* Theme toggle alignment */
.theme-toggle {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
}

.theme-toggle label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: normal;
}

.theme-toggle input {
    margin: 0;
}

.verified-toggle {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
}

.verified-toggle label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: normal;
}

.verified-toggle input {
    margin: 0;
}

/* Verified icon for toggle */
.verified-toggle .verified-icon {
    width: 16px;
    height: 16px;
    fill: var(--text-color);
}

/* Modal styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
    background-color: var(--card-bg);
    margin: 10% auto;
    padding: 20px;
    border-radius: 12px;
    width: 90%;
    max-width: 400px;
    box-shadow: 0 4px 8px var(--shadow-color);
}

/* ---------------------------------------------------------------
   Welcome modal specific responsive adjustments
   --------------------------------------------------------------- */
/* Base overrides for the welcome modal – use viewport width units
   instead of a fixed max‑width to better fit small screens. */
#welcome-modal .modal-content {
    max-width: 90vw;      /* up to 90% of the viewport width */
    width: 90%;
    padding: 20px;
    margin: 10% auto;    /* keep vertical centering on larger screens */
}

/* Tablet / small‑desktop */
@media (max-width: 768px) {
    #welcome-modal .modal-content {
        max-width: 95vw;
        margin: 20px auto;
        padding: 15px;
    }

    /* Stack the inner flex container vertically */
    #welcome-modal .modal-content > div[style*="display: flex"] {
        flex-direction: column;
        gap: 15px;
        align-items: center;
    }

    #welcome-modal .modal-title {
        font-size: 18px;
        text-align: center;
        margin-bottom: 15px;
    }

    #welcome-modal .modal-header {
        justify-content: center;
        margin-bottom: 15px;
    }

    /* Reduce logo size on smaller screens */
    #welcome-modal img[alt="Birdurr Logo"] {
        width: 80px;
        height: 80px;
        margin-bottom: 10px;
    }

    #welcome-modal p {
        font-size: 14px;
        line-height: 1.4;
        margin: 0 0 10px 0;
        text-align: center;
    }
}

/* Mobile phones */
@media (max-width: 480px) {
    #welcome-modal .modal-content {
        max-width: 98vw;
        padding: 10px;
    }

    #welcome-modal img[alt="Birdurr Logo"] {
        width: 60px;
        height: 60px;
    }

    /* Make inputs and buttons larger for touch */
    #welcome-username-input,
    #welcome-avatar-upload + .file-input-label {
        font-size: 16px;
    }
}

/* Very small screens (e.g., old phones) */
@media (max-width: 320px) {
    #welcome-modal .modal-content {
        max-width: 100vw;
        height: 100vh;
        border-radius: 0;
        margin: 0;
        overflow-y: auto;
    }
}

@media (max-width: 600px) {
    .modal-content {
        margin: 20px auto;
        width: 95%;
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.modal-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-color);
}

.close {
    color: var(--text-color);
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
}

.close:hover {
    opacity: 0.7;
}

.avatar-preview-container {
    display: flex;
    justify-content: center;
    margin: 15px 0;
}

.avatar-preview {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--topic-active-bg);
}

.file-input-container {
    margin: 15px 0;
}

.file-input-label {
    display: block;
    padding: 10px;
    background-color: var(--topic-bg);
    border-radius: 8px;
    text-align: center;
    cursor: pointer;
    margin-bottom: 10px;
    transition: background-color 0.2s;
}

.file-input-label:hover {
    background-color: var(--topic-bg);
    opacity: 0.9;
}

.file-input {
    display: none;
}

.file-name {
    font-size: 14px;
    color: #657786;
    text-align: center;
    word-break: break-all;
}

.error-message {
    color: var(--error-color);
    font-size: 14px;
    margin: 10px 0;
    display: none;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 20px;
}

.btn {
    padding: 8px 16px;
    border-radius: 8px;
    font-weight: 700;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn-primary {
    background-color: var(--topic-active-bg);
    color: white;
    border: none;
}

.btn-primary:hover {
    opacity: 0.9;
}

.btn-secondary {
    background-color: var(--topic-bg);
    color: var(--text-color);
    border: none;
}

.btn-secondary:hover {
    opacity: 0.9;
}

/* Loading state */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 40px;
}

.spinner {
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--topic-active-bg);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

.error-message-container {
    color: var(--error-color);
    text-align: center;
    padding: 20px;
    display: none;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    .header {
        flex-direction: column;
        align-items: flex-start;
    }

    .header-right {
        width: 100%;
        justify-content: flex-end;
        margin-top: 10px;
    }

    .topics {
        margin-bottom: 10px;
    }

    .post {
        padding: 12px;
    }

    .post-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .avatar {
        margin-right: 0;
        margin-bottom: 8px;
    }

    .post-actions {
        flex-direction: column;
        align-items: flex-start;
    }

    .reply-btn,
    .delete-btn {
        width: 100%;
        text-align: center;
        margin-bottom: 5px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 10px;
    }

    .logo {
        font-size: 20px;
    }

    .post {
        padding: 10px;
    }

    .avatar {
        width: 40px;
        height: 40px;
    }

    .modal-content {
        padding: 15px;
    }
}

.like-btn {
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 0;
    font-size: 14px;
}

.like-btn.liked .like-icon {
    color: #e0245e;
}

.like-btn .like-icon {
    font-size: 16px;
}

.like-icon {
    color: #657786;
}

.mention,
.hashtag {
    color: var(--topic-active-bg);
    text-decoration: none;
    cursor: pointer;
}

.mention:hover,
.hashtag:hover {
    text-decoration: underline;
}

.post-content {
    color: var(--text-color);
    line-height: 1.4;
    margin-bottom: 10px;
    word-wrap: break-word;
    overflow-wrap: break-word;
    overflow: hidden;
}

.post-header .avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    margin-right: 16px;
    object-fit: cover;
    cursor: pointer;
    transition: transform 0.2s ease, opacity 0.2s ease;
    flex-shrink: 0;
    background-color: transparent !important;
    /* Remove background color */
    border: 2px solid transparent;
    /* Add transparent border */
}

.post-header .avatar,
.post-header .username {
    cursor: pointer;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.post-header .avatar:hover,
.post-header .username:hover {
    transform: scale(1.05);
    opacity: 0.8;
}

.post-header .user-info {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-width: 0;
    /* Add this to prevent overflow */
}

.post-header .username {
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    cursor: pointer;
    transition: transform 0.2s ease, opacity 0.2s ease;
    display: block;
    width: fit-content;
    padding: 0 4px;
}

.post-header .username-wrapper {
    position: relative;
    z-index: 1;
    margin-left: 0;
}

.post-header:hover .username-wrapper {
    z-index: 2;
}

.post-header:hover .username {
    transform: translateX(0) scale(1.05);
    opacity: 0.8;
}

.post-header:hover .avatar {
    transform: scale(1.05);
    opacity: 0.8;
    border-color: var(--topic-active-bg);
}

/* Special styling for original posts (from appData) */
.post.original .post-header .avatar,
.post.original .post-header .username {
    cursor: pointer;
}

.post.original .post-header .avatar:hover,
.post.original .post-header .username:hover {
    transform: scale(1.05);
    opacity: 0.8;
}

#profile-posts-container {
    padding-right: 15px;
}

/* Profile modal background overlay using avatar image */
#profile-body {
    position: relative;
    overflow: hidden;
}

#profile-body::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image: var(--profile-avatar-url);
    background-size: cover;
    background-position: center;
    opacity: 0.15;
    /* Use a non‑negative z-index so the pseudo‑element appears above the modal's background */
    z-index: 0;
}

/* Ensure all direct children of the profile body are stacked above the background pseudo‑element */
#profile-body > * {
    position: relative;
    z-index: 1;
}
/* For WebKit browsers (Chrome, Safari, Edge) */
#profile-posts-container::-webkit-scrollbar {
    width: 10px;
}

#profile-posts-container::-webkit-scrollbar-track {
    background: var(--card-bg);
}

#profile-posts-container::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 5px;
}

#profile-posts-container::-webkit-scrollbar-thumb:hover {
    background: var(--topic-bg);
}

.verified-badge {
    display: inline-flex;
    vertical-align: middle;
    width: 1em;
    height: 1em;
    fill: var(--topic-active-bg);
    flex-shrink: 0;
    margin-left: 2px;
}

.verified-badge:hover {
    opacity: 0.8;
}

.username-wrapper {
    display: flex;
    align-items: center;
    gap: 4px;
    flex-shrink: 0;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
}

#profile-username-header {
    font-size: 24px;
    font-weight: bold;
    margin-top: 10px;
    margin-bottom: 5px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

#profile-username-header .verified-badge {
    width: 1.2em;
    height: 1.2em;
    margin-left: 5px;
}

.username-input-wrapper {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    width: 100%;
    box-sizing: border-box;
    margin-top: 5px;
}

.username-input-wrapper input {
    flex: 1;
    width: 100%;
    min-width: 0;
    box-sizing: border-box;
}

.username-prefix {
    font-size: 1rem;
    color: var(--text-color);
    user-select: none;
}