:root {
    --bg-color: #1a1a2e;
    --bg-secondary: #16213e;
    --panel-bg: #0f1729;
    --curve-color: #00d9ff;
    --curve-glow: rgba(0, 217, 255, 0.4);
    --selected-color: #888888;
    --selected-glow: rgba(136, 136, 136, 0.4);
    --text-color: #e0e0e0;
    --text-muted: #888;
    --border-color: #2a3f5f;
    --btn-bg: #2a3f5f;
    --btn-hover: #3a5070;
    --danger-color: #e74c3c;
    --danger-hover: #c0392b;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    overflow: hidden;
}

/* Header */
#header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    height: 60px;
}

.header-left {
    display: flex;
    gap: 10px;
    align-items: center;
}

.header-title {
    font-size: 1.2rem;
    color: var(--curve-color);
    text-transform: uppercase;
    letter-spacing: 2px;
    font-weight: 300;
}

/* Buttons */
.btn {
    padding: 8px 16px;
    border: none;
    border-radius: 4px;
    background: var(--btn-bg);
    color: var(--text-color);
    cursor: pointer;
    font-size: 14px;
    transition: background 0.2s;
}

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

.btn-primary {
    background: var(--curve-color);
    color: #000;
}

.btn-primary:hover {
    background: #00b8d9;
}

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

.btn-danger:hover {
    background: var(--danger-hover);
}

.btn-small {
    padding: 4px 8px;
    font-size: 12px;
    background: var(--btn-bg);
    color: var(--text-color);
    border: none;
    border-radius: 3px;
    cursor: pointer;
}

/* Select */
select {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--bg-color);
    color: var(--text-color);
    font-size: 14px;
    min-width: 200px;
    cursor: pointer;
}

select:focus {
    outline: none;
    border-color: var(--curve-color);
}

/* Main layout */
#main {
    display: flex;
    height: calc(100vh - 60px);
}

/* Canvas container */
#canvas-container {
    flex: 1;
    position: relative;
    background: var(--bg-color);
    background-image:
        radial-gradient(circle at center, rgba(0, 217, 255, 0.03) 0%, transparent 70%);
}

#spiral-canvas {
    width: 100%;
    height: 100%;
    display: block;
}


/* Translation panel */
#translation-panel {
    width: 320px;
    background: var(--panel-bg);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

#panel-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

#panel-header h2 {
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

#writer-name {
    font-size: 1.2rem;
    color: var(--selected-color);
    font-weight: 500;
    display: block;
}

#delete-message-btn {
    margin-top: 10px;
}

#message-content {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    overflow-x: hidden;
    line-height: 1.6;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

#message-content p {
    white-space: pre-wrap;
    word-wrap: break-word;
    overflow-wrap: break-word;
    word-break: normal;
}

#message-content .placeholder {
    color: var(--text-muted);
    font-style: italic;
}

/* Modals */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: var(--bg-secondary);
    padding: 24px;
    border-radius: 8px;
    width: 90%;
    max-width: 450px;
    border: 1px solid var(--border-color);
}

.modal-content h3 {
    margin-bottom: 20px;
    color: var(--curve-color);
}

/* Forms */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 14px;
    color: var(--text-muted);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--bg-color);
    color: var(--text-color);
    font-size: 14px;
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--curve-color);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-group .hint {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 6px;
}


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

/* Checkbox label */
.checkbox-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    color: var(--text-muted);
    cursor: pointer;
    padding: 8px 12px;
    border-radius: 4px;
    transition: color 0.2s;
}

.checkbox-label:hover {
    color: var(--text-color);
}

.checkbox-label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--curve-color);
    cursor: pointer;
}

/* Utility */
.hidden {
    display: none !important;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-color);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--btn-bg);
}


/* Collision modal */
.collision-modal-content {
    max-width: 400px;
}

.collision-modal-content p {
    color: var(--text-muted);
    margin-bottom: 20px;
    line-height: 1.5;
}


/* Drawing status indicator on canvas */
.drawing-status {
    position: absolute;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.8);
    color: #00ff64;
    padding: 10px 20px;
    border-radius: 20px;
    font-size: 14px;
    border: 1px solid #00ff64;
    pointer-events: none;
    z-index: 100;
    white-space: nowrap;
}

/* User info in header */
.user-info {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-left: auto;
    margin-right: 16px;
}

.username-display {
    color: var(--curve-color);
    font-size: 14px;
}

/* Read-only banner */
.readonly-banner {
    background: rgba(0, 217, 255, 0.15);
    color: var(--curve-color);
    text-align: center;
    padding: 6px 0;
    font-size: 13px;
    letter-spacing: 1px;
    text-transform: uppercase;
    border-bottom: 1px solid var(--border-color);
}

/* Friends modal */
.friends-modal-content {
    max-width: 500px;
}

.friends-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
}

.friends-tab {
    padding: 6px 14px;
    border: none;
    border-radius: 4px 4px 0 0;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 14px;
    transition: color 0.2s, background 0.2s;
    position: relative;
}

.friends-tab:hover {
    color: var(--text-color);
}

.friends-tab.active {
    color: var(--curve-color);
    background: rgba(0, 217, 255, 0.1);
}

.friends-tab-content {
    display: none;
}

.friends-tab-content.active {
    display: block;
}

.friends-tab-content h4 {
    color: var(--text-muted);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin: 12px 0 8px;
}

.friends-list {
    max-height: 250px;
    overflow-y: auto;
}

.friend-row,
.request-row,
.search-result-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 12px;
    border-radius: 4px;
    margin-bottom: 4px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
}

.friend-row:hover,
.request-row:hover,
.search-result-row:hover {
    border-color: var(--curve-color);
}

.friend-username {
    color: var(--text-color);
    font-size: 14px;
}

.request-actions {
    display: flex;
    gap: 6px;
}

/* Badge */
.badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 18px;
    height: 18px;
    padding: 0 5px;
    border-radius: 9px;
    background: var(--danger-color);
    color: #fff;
    font-size: 11px;
    font-weight: bold;
    margin-left: 4px;
    vertical-align: middle;
}

/* Friends checklist in thread creation modal */
.friends-checklist {
    max-height: 150px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 8px;
    background: var(--bg-color);
}

.friend-checkbox {
    display: flex;
    padding: 4px 8px;
    margin: 0;
}

/* Collaborators list */
.collaborators-list {
    max-height: 200px;
    overflow-y: auto;
}