/* Shared base styles - Common to ALL pages (index.html, formulas.html, tasks.html) */

/* CSS Variables - ALL PAGES */
:root {
    --primary-color: #4a90e2;
    --primary-dark: #357abd;
    --success-color: #52c41a;
    --warning-color: #faad14;
    --hint-color: #B87333;
    --error-color: #f5222d;
    --info-color: #1890ff;
}

/* Light mode colors */
:root[data-theme="light"] {
    --bg-color: #f5f5f5;
    --surface-color: #ffffff;
    --text-color: #262626;
    --text-muted: #8c8c8c;
    --border-color: #d9d9d9;
    --code-bg: #f6f8fa;
    --line-numbers-bg: #f0f0f0;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* Dark mode colors (default) */
:root,
:root[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --surface-color: #2d2d2d;
    --text-color: #e0e0e0;
    --text-muted: #a0a0a0;
    --border-color: #404040;
    --code-bg: #252525;
    --line-numbers-bg: #1f1f1f;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

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

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

/* Container */
.container {
    margin: 0 auto;
    padding: 20px;
}

/* Header - ALL PAGES */
header {
    text-align: center;
    margin-bottom: 20px;
    flex-shrink: 0;
    position: relative;
}

h1 {
    font-size: 2rem;
    margin-bottom: 0;
    color: var(--primary-color);
}

.header-actions {
    position: absolute;
    top: 0;
    right: 0;
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-link {
    color: var(--text-color);
    text-decoration: none;
    padding: 8px 12px;
    border-radius: 4px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s;
    border: 1px solid var(--border-color);
}

.nav-link:hover {
    background-color: var(--code-bg);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.theme-toggle {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 8px;
    border-radius: 4px;
    transition: background-color 0.2s;
}

.theme-toggle:hover {
    background-color: var(--code-bg);
}

/* Navigation dropdown menu */
.nav-menu {
    position: relative;
    display: inline-block;
}

.nav-menu-button {
    color: var(--text-color);
    text-decoration: none;
    padding: 8px 12px;
    border-radius: 4px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s;
    border: 1px solid var(--border-color);
    background: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.nav-menu-button:hover {
    background-color: var(--code-bg);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.nav-menu-button::after {
    content: '▼';
    font-size: 0.7rem;
    transition: transform 0.2s;
}

.nav-menu.open .nav-menu-button::after {
    transform: rotate(180deg);
}

.nav-menu-dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 4px);
    right: 0;
    min-width: 200px;
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    box-shadow: var(--shadow);
    z-index: 1000;
    padding: 6px 0;
}

.nav-menu.open .nav-menu-dropdown {
    display: block;
}

.nav-menu-dropdown .nav-link {
    display: block;
    padding: 10px 16px;
    border: none;
    border-radius: 0;
    font-size: 0.9rem;
}

.nav-menu-dropdown .nav-link:hover {
    background-color: var(--code-bg);
    border: none;
}

.nav-menu-separator {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 6px 0;
}

/* Known issues - ALL PAGES */
.known-issues {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px 16px;
    margin-bottom: 20px;
    font-size: 0.9rem;
}

.known-issues summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--warning-color);
    user-select: none;
    padding: 4px 0;
}

.known-issues summary:hover {
    color: var(--primary-color);
}

.known-issues ul {
    margin-top: 12px;
    margin-left: 20px;
}

.known-issues li {
    margin-bottom: 8px;
    color: var(--text-color);
}

.known-issues code {
    background: var(--code-bg);
    padding: 2px 6px;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
    font-size: 0.85em;
}

/* Section headers - ALL PAGES */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border-color);
}

.section-header h2 {
    font-size: 1.5rem;
    color: var(--text-color);
}

/* Buttons - ALL PAGES */
.actions {
    display: flex;
    gap: 10px;
}

.btn {
    padding: 8px 16px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
}

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

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

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

.btn-secondary:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.btn:active {
    transform: translateY(1px);
}

/* Loading state - ALL PAGES */
.loading {
    pointer-events: none;
    opacity: 0.6;
}

.loading::after {
    content: '';
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid var(--primary-color);
    border-right-color: transparent;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    margin-left: 8px;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Placeholder - ALL PAGES */
.placeholder {
    color: var(--text-muted);
    text-align: center;
    padding: 40px 20px;
}

.placeholder.error {
    color: var(--error-color);
}