:root {
    --bg: #ffffff;
    --surface: #f5f5f5;
    --border: #e0e0e0;
    --text: #1a1a1a;
    --text-secondary: #666666;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --danger: #dc2626;
    --success: #16a34a;
    --warning: #ea580c;
}

[data-theme="dark"] {
    --bg: #0a0a0a;
    --surface: #1a1a1a;
    --border: #2a2a2a;
    --text: #f5f5f5;
    --text-secondary: #a0a0a0;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

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

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    border-bottom: 1px solid var(--border);
    margin-bottom: 30px;
}

.header h1 {
    font-size: 24px;
    font-weight: 600;
}

.header-actions {
    display: flex;
    gap: 15px;
    align-items: center;
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-block;
}

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

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

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

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

.btn-small {
    padding: 6px 12px;
    font-size: 13px;
}

.theme-toggle {
    background: var(--surface);
    border: 1px solid var(--border);
    width: 40px;
    height: 40px;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
}

.task-list {
    display: grid;
    gap: 15px;
}

.task-item {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
    cursor: pointer;
    transition: border-color 0.2s;
}

.task-item:hover {
    border-color: var(--primary);
}

.task-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 10px;
}

.task-title {
    font-size: 18px;
    font-weight: 500;
    margin-bottom: 5px;
}

.task-meta {
    display: flex;
    gap: 10px;
    font-size: 13px;
    color: var(--text-secondary);
}

.badge {
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
}

.badge-new { background: var(--primary); color: white; }
.badge-in_progress { background: var(--warning); color: white; }
.badge-completed { background: var(--success); color: white; }
.badge-cancelled { background: var(--text-secondary); color: white; }
.badge-high { background: var(--danger); color: white; }
.badge-medium { background: var(--warning); color: white; }
.badge-low { background: var(--text-secondary); color: white; }

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 14px;
}

.form-control {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg);
    color: var(--text);
    font-size: 14px;
}

textarea.form-control {
    min-height: 120px;
    resize: vertical;
}

.comment-list {
    margin-top: 30px;
}

.comment {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 15px;
    margin-bottom: 15px;
}

.comment-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    font-size: 13px;
    color: var(--text-secondary);
}

.comment-author {
    font-weight: 500;
    color: var(--text);
}

.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-box {
    width: 100%;
    max-width: 400px;
    padding: 40px;
}

.alert {
    padding: 12px 16px;
    border-radius: 6px;
    margin-bottom: 20px;
    font-size: 14px;
}

.alert-error {
    background: rgba(220, 38, 38, 0.1);
    color: var(--danger);
    border: 1px solid var(--danger);
}

.alert-success {
    background: rgba(22, 163, 74, 0.1);
    color: var(--success);
    border: 1px solid var(--success);
}

.public-badge {
    background: var(--surface);
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 13px;
    color: var(--text-secondary);
}

.tabs {
    display: flex;
    gap: 5px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 20px;
}

.tab {
    padding: 10px 20px;
    cursor: pointer;
    border: none;
    background: none;
    color: var(--text-secondary);
    border-bottom: 2px solid transparent;
}

.tab.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}