/* Global styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body, input, button, select, textarea {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

:root {
    --bg-color: #ffffff;
    --text-color: #0f1419;
    --card-bg: #ffffff;
    --border-color: #eff3f4;
    --secondary-text: #536471;
    --primary-blue: #1d9bf0;
    --primary-blue-hover: #1a8cd8;
    --shadow: rgba(101, 119, 134, 0.2);
    --logo: #000000;
    --hover-bg: rgba(15, 20, 25, 0.1);
}

[data-theme="dark"] {
    --bg-color: #000000;
    --text-color: #e7e9ea;
    --card-bg: #000000;
    --border-color: #2f3336;
    --secondary-text: #71767b;
    --primary-blue: #1d9bf0;
    --primary-blue-hover: #1a8cd8;
    --shadow: rgba(255, 255, 255, 0.2);
    --logo: #ffffff;
    --hover-bg: rgba(231, 233, 234, 0.1);
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.3125;
    transition: background-color 0.3s ease, color 0.3s ease;
    font-size: 15px;
}

/* Header styles */
.app-header {
    margin-bottom: 0;
    text-align: center;
    position: relative;
    display: grid;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--card-bg);
    backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    flex: 1;
}

.logo h1 {
    font-size: 20px;
    font-weight: 800;
    color: var(--text-color);
}

.twitter-logo {
    width: 30px;
    height: 30px;
    fill: var(--logo);
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 12px;
}

.language-selector {
    padding: 8px 12px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    background-color: var(--card-bg);
    color: var(--text-color);
    font-size: 14px;
    cursor: pointer;
    font-weight: 500;
}

.language-selector:hover {
    background-color: var(--hover-bg);
}

.dark-mode-toggle {
    position: static;
    transform: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: background-color 0.2s ease;
}

.dark-mode-toggle:hover {
    background-color: var(--hover-bg);
}

.dark-mode-toggle svg {
    width: 24px;
    height: 24px;
    stroke: var(--text-color);
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

[data-theme="dark"] .moon-icon {
    display: none;
}

[data-theme="dark"] .sun-icon {
    display: block !important;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    background-color: var(--card-bg);
    min-height: 100vh;
    border-left: 1px solid var(--border-color);
    border-right: 1px solid var(--border-color);
}

.main-content {
    background-color: var(--card-bg);
}

/* Input section */
.input-section {
    background-color: var(--card-bg);
    border-radius: 0;
    padding: 16px;
    box-shadow: none;
    border: none;
    border-bottom: 1px solid var(--border-color);
}

.tweet-input-container {
    position: relative;
    margin-bottom: 12px;
}

#tweet-input {
    width: 100%;
    min-height: 120px;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    resize: vertical;
    font-size: 20px;
    line-height: 1.25;
    background-color: var(--card-bg);
    color: var(--text-color);
    font-family: inherit;
}

#tweet-input::placeholder {
    color: var(--secondary-text);
    font-size: 20px;
}

#tweet-input:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 1px var(--primary-blue);
}

.char-count {
    position: absolute;
    bottom: 12px;
    right: 12px;
    font-size: 13px;
    color: var(--secondary-text);
    background-color: var(--card-bg);
    padding: 2px 6px;
    border-radius: 12px;
}

.buttons {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
    justify-content: flex-end;
}

.primary-btn, .secondary-btn {
    padding: 8px 24px;
    border-radius: 20px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 15px;
    min-height: 36px;
}

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

.primary-btn:hover:not(:disabled) {
    background-color: var(--primary-blue-hover);
}

.primary-btn:disabled {
    background-color: #8ecdf8;
    cursor: not-allowed;
}

.secondary-btn {
    background-color: transparent;
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

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

/* Settings styles */
.settings {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
}

.setting {
    display: flex;
    align-items: center;
    gap: 8px;
}

.setting label {
    font-weight: 600;
    color: var(--text-color);
    font-size: 14px;
}

.setting select {
    padding: 6px 12px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    background-color: var(--card-bg);
    color: var(--text-color);
    font-size: 14px;
}

.setting select:hover {
    border-color: var(--primary-blue);
}

/* Replies section */
.replies-section {
    background-color: var(--card-bg);
    border-radius: 0;
    padding: 0;
    box-shadow: none;
    border: none;
}

.replies-section h2 {
    font-size: 20px;
    font-weight: 800;
    margin-bottom: 0;
    color: var(--text-color);
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--card-bg);
    position: sticky;
    top: 73px;
    z-index: 999;
    backdrop-filter: blur(12px);
}

/* Tweet styles */
.tweet {
    border-bottom: 1px solid var(--border-color);
    padding: 12px 16px;
    transition: background-color 0.2s ease;
}

.tweet:hover {
    background-color: rgba(0, 0, 0, 0.03);
}

[data-theme="dark"] .tweet:hover {
    background-color: rgba(255, 255, 255, 0.03);
}

.tweet:last-child {
    border-bottom: 1px solid var(--border-color);
}

.tweet-header {
    display: flex;
    align-items: flex-start;
    margin-bottom: 2px;
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--secondary-text);
    margin-right: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    flex-shrink: 0;
}

.avatar span {
    font-size: 16px;
    font-weight: 700;
}

.avatar svg {
    width: 24px;
    height: 24px;
    fill: var(--secondary-text);
}

.user-info {
    flex: 1;
    display: flex;
    align-items: baseline;
    gap: 4px;
}

.user-name {
    font-weight: 700;
    color: var(--text-color);
    font-size: 15px;
}

.user-handle {
    color: var(--secondary-text);
    font-size: 15px;
    font-weight: 400;
}

.tweet-content {
    margin-left: 52px;
    margin-bottom: 8px;
    font-size: 15px;
    line-height: 1.3125;
    word-wrap: break-word;
}

.tweet-actions {
    margin-left: 52px;
    display: flex;
    justify-content: space-between;
    max-width: 425px;
    gap: 8px;
}

.action {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--secondary-text);
    font-size: 13px;
    cursor: pointer;
    padding: 8px;
    border-radius: 20px;
    transition: all 0.2s ease;
    min-width: 70px;
    justify-content: flex-start;
}

.action:hover {
    background-color: rgba(29, 155, 240, 0.1);
    color: var(--primary-blue);
}

.action:hover svg {
    fill: var(--primary-blue);
}

.action svg {
    width: 18px;
    height: 18px;
    fill: var(--secondary-text);
    transition: fill 0.2s ease;
}

/* Reply input styles */
.reply-input-container {
    margin-left: 52px;
    margin-top: 12px;
    padding: 12px;
    background-color: var(--hover-bg);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.reply-input-container textarea {
    width: 100%;
    min-height: 60px;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    resize: vertical;
    font-size: 14px;
    background-color: var(--card-bg);
    color: var(--text-color);
    font-family: inherit;
    margin-bottom: 8px;
}

.reply-input-container textarea::placeholder {
    color: var(--secondary-text);
}

.reply-input-container textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
}

.reply-input-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

.reply-input-actions button {
    padding: 6px 16px;
    border-radius: 16px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.reply-submit-btn {
    background-color: var(--primary-blue);
    color: white;
    border: none;
}

.reply-submit-btn:hover:not(:disabled) {
    background-color: var(--primary-blue-hover);
}

.reply-submit-btn:disabled {
    background-color: #8ecdf8;
    cursor: not-allowed;
}

.reply-cancel-btn {
    background-color: transparent;
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.reply-cancel-btn:hover {
    background-color: var(--hover-bg);
}

.user-reply-btn {
    background-color: transparent;
    color: var(--primary-blue);
    border: 1px solid var(--primary-blue);
    padding: 6px 16px;
    border-radius: 16px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-left: 8px;
}

.user-reply-btn:hover {
    background-color: rgba(29, 155, 240, 0.1);
}

/* Nested replies styles */
.nested-replies {
    margin-left: 52px;
    border-left: 2px solid var(--border-color);
    margin-top: 4px;
}

.nested-tweet {
    border-bottom: 1px solid var(--border-color);
    padding: 8px 12px;
    background-color: var(--card-bg);
}

.nested-tweet:last-child {
    border-bottom: none;
}

.nested-tweet .tweet-header {
    margin-bottom: 4px;
}

.nested-tweet .avatar {
    width: 32px;
    height: 32px;
    margin-right: 8px;
}

.nested-tweet .avatar span {
    font-size: 12px;
}

.nested-tweet .tweet-content {
    margin-left: 40px;
    margin-bottom: 8px;
    font-size: 14px;
}

.nested-tweet .tweet-actions {
    margin-left: 40px;
    max-width: 300px;
}

.nested-tweet .action {
    font-size: 12px;
    padding: 6px;
    min-width: 50px;
}

.nested-tweet .action svg {
    width: 16px;
    height: 16px;
}

.reply-loading {
    margin-left: 40px;
    padding: 12px;
    color: var(--secondary-text);
    font-size: 14px;
}

.author-reply {
    background-color: rgba(29, 155, 240, 0.05);
    border-left: 3px solid var(--primary-blue);
    margin-left: 8px;
}

[data-theme="dark"] .author-reply {
    background-color: rgba(29, 155, 240, 0.1);
}

/* Image upload styles */
.image-upload-container {
    margin-bottom: 12px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
}

.image-upload-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-blue);
    cursor: pointer;
    padding: 8px 16px;
    border-radius: 20px;
    font-weight: 500;
    transition: background-color 0.2s;
    border: 1px solid transparent;
}

.image-upload-label:hover {
    background-color: rgba(29, 155, 240, 0.1);
}

.image-icon {
    width: 20px;
    height: 20px;
    fill: var(--primary-blue);
}

.image-preview {
    max-width: 100%;
    margin-bottom: 12px;
}

.image-preview img {
    max-width: 100%;
    max-height: 300px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
}

.remove-image-btn {
    background-color: transparent;
    color: #f4212e;
    border: 1px solid #f4212e;
    padding: 6px 16px;
    border-radius: 20px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
    font-size: 14px;
}

.remove-image-btn:hover {
    background-color: rgba(244, 33, 46, 0.1);
}

/* Tweet image in replies */
.tweet-image-container {
    margin-left: 52px;
    margin-top: 8px;
    margin-bottom: 8px;
}

.tweet-image {
    max-width: 100%;
    max-height: 300px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
}

/* Loading spinner */
#loading-spinner {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 16px;
}

.spinner {
    width: 32px;
    height: 32px;
    border: 2px solid var(--border-color);
    border-top: 2px solid var(--primary-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 16px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

#loading-spinner p {
    color: var(--secondary-text);
    font-size: 15px;
}

/* Responsive styles */
@media (max-width: 600px) {
    .container {
        border-left: none;
        border-right: none;
    }
    
    .settings {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .tweet-actions {
        max-width: 480px;
        gap: 4px;
    }
    
    .action {
        min-width: 60px;
    }
}

.hidden {
    display: none !important;
}