/* Professional & Calm HR Theme */
:root {
    --color-bg-sidebar: #fdfdfd;
    --color-bg-main: #f4f6f8;
    --color-text-primary: #1f2937;
    --color-text-secondary: #6b7280;
    --color-border: #e5e7eb;
    --color-active-bg: #f3f4f6;
    --color-active-text: #111827;
    --color-accent: #4b5563;
    
    --font-heading: 'Playfair Display', serif;
    --font-body: 'Source Sans Pro', sans-serif;
}

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

body, html {
    height: 100%;
    font-family: var(--font-body);
    color: var(--color-text-primary);
    background-color: var(--color-bg-main);
    line-height: 1.6;
}

/* Layout */
.layout {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 320px;
    background-color: var(--color-bg-sidebar);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    box-shadow: 2px 0 15px rgba(0, 0, 0, 0.02);
    z-index: 10;
}

.sidebar-header {
    padding: 3rem 2rem 2rem;
    border-bottom: 1px solid var(--color-border);
}

.sidebar-header h2 {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--color-text-primary);
    letter-spacing: -0.01em;
}

.subtitle {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 600;
}

.nav-list {
    list-style: none;
    padding: 1.5rem 0;
    overflow-y: auto;
    flex-grow: 1;
}

.nav-item {
    display: block;
    padding: 1rem 2rem;
    text-decoration: none;
    color: var(--color-text-secondary);
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
    font-size: 1.05rem;
}

.nav-item:hover {
    background-color: rgba(243, 244, 246, 0.5);
    color: var(--color-text-primary);
}

.nav-item.active {
    background-color: var(--color-active-bg);
    color: var(--color-active-text);
    border-left-color: var(--color-accent);
    font-weight: 600;
}

.sidebar-footer {
    padding: 2rem;
    font-size: 0.75rem;
    color: #9ca3af;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-top: 1px solid var(--color-border);
}

/* Main Content Area */
.content-area {
    flex-grow: 1;
    overflow-y: auto;
    background-color: var(--color-bg-main);
    position: relative;
    scroll-behavior: smooth;
}

/* Section Detection & Full Page Layouts */
.pdf-section {
    height: 100vh;
    width: 100%;
    padding: 2.5rem 3rem;
    display: flex;
    flex-direction: column;
    border-bottom: 1px solid var(--color-border);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--color-text-primary);
    font-weight: 600;
}

.action-link {
    font-size: 0.9rem;
    color: var(--color-text-primary);
    text-decoration: none;
    border: 1px solid var(--color-border);
    padding: 0.5rem 1.25rem;
    border-radius: 4px;
    background-color: var(--color-bg-sidebar);
    transition: all 0.2s ease;
    font-weight: 600;
}

.action-link:hover {
    background-color: var(--color-active-bg);
    border-color: var(--color-accent);
}

.iframe-container {
    flex-grow: 1;
    border-radius: 6px;
    overflow: hidden;
    background-color: #fff;
    border: 1px solid var(--color-border);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
}

.iframe-container iframe {
    width: 100%;
    height: 100%;
    border: none;
    display: block;
}

/* Error State */
.error-state {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: #fff;
    padding: 3rem;
    border-radius: 8px;
    box-shadow: 0 4px 25px rgba(0,0,0,0.05);
    border: 1px solid var(--color-border);
    max-width: 500px;
}

.error-state h3 {
    color: #b91c1c;
    margin-bottom: 1rem;
    font-family: var(--font-heading);
    font-size: 1.5rem;
}

.error-state p {
    color: var(--color-text-secondary);
    margin-bottom: 1.5rem;
}

.code-block {
    background: #f9fafb;
    padding: 1.5rem;
    border-radius: 6px;
    border: 1px solid var(--color-border);
}

.code-block p {
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
    color: var(--color-text-primary);
}

.code-block code {
    display: block;
    color: #111827;
    font-family: monospace;
    font-size: 0.95rem;
    font-weight: 600;
}

.hidden {
    display: none !important;
}

.nav-loading {
    padding: 1.5rem 2rem;
    color: var(--color-text-secondary);
    font-style: italic;
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --color-bg-sidebar: #111827;
    --color-bg-main: #030712;
    --color-text-primary: #f9fafb;
    --color-text-secondary: #9ca3af;
    --color-border: #374151;
    --color-active-bg: #1f2937;
    --color-active-text: #f3f4f6;
    --color-accent: #9ca3af;
}

/* Theme Toggle Customization */
.theme-toggle {
    margin-bottom: 1rem;
    display: flex;
    justify-content: flex-start;
}

.theme-btn {
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    padding: 0.5rem 0.75rem;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-body);
    font-size: 0.85rem;
    transition: all 0.2s;
    outline: none;
}

.theme-btn:hover {
    background: var(--color-active-bg);
    color: var(--color-text-primary);
}

.theme-btn svg {
    width: 16px;
    height: 16px;
}