/* 
 * App Design System Tokens 
 * Refined based on app screenshots: extremely clean, high contrast, monochrome, flat.
 */

:root {
    /* Base Typography configuration for Apple/System default to hit SF Pro */
    --font-family-base: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";

    /* Fluid typography scales based on 4px grid */
    --text-display: clamp(24px, 5vw, 32px);
    --text-heading: clamp(16px, 3vw, 20px);
    --text-body: clamp(14px, 2vw, 15px);

    /* Spacing (4px grid system) */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;

    /* Transitions */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode Tokens (Pitch black vibe) */
[data-theme="dark"] {
    --bg-root: #000000;
    --bg-elevated: #111111;
    --bg-hover: #1A1A1A;

    --text-primary: #FFFFFF;
    --text-secondary: #BBBBBB;
    --text-tertiary: #888888;

    --border-color: #222222;
    --border-subtle: #181818;

    color-scheme: dark;
}

/* Light Mode Tokens (Pure white vibe) */
[data-theme="light"] {
    --bg-root: #FFFFFF;
    --bg-elevated: #F9F9F9;
    --bg-hover: #F0F0F0;

    --text-primary: #000000;
    --text-secondary: #666666;
    --text-tertiary: #999999;

    --border-color: #EAEAEA;
    --border-subtle: #F4F4F4;

    color-scheme: light;
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family-base);
    background-color: var(--bg-root);
    color: var(--text-primary);
    line-height: 1.5;
    font-size: var(--text-body);
    font-weight: 400;
    letter-spacing: 0;
    transition: background-color var(--transition-normal), color var(--transition-normal);
    overflow-x: hidden;
    min-height: 100vh;
}

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* App Bar / Header exactly like the app: minimal, centered logo or left aligned */
.app-bar {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(var(--bg-root-rgb), 0.95);
    /* We need RGB format for strict backdrop alpha if we want it, but fallback to root */
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
    padding: var(--space-3) var(--space-4);
    /* Tight padding as seen in app headings */
}

[data-theme="dark"] .app-bar {
    background-color: rgba(0, 0, 0, 0.85);
    border-bottom: 0.5px solid var(--border-color);
    /* App screens show subtle separators */
}

[data-theme="light"] .app-bar {
    background-color: rgba(255, 255, 255, 0.85);
    border-bottom: 0.5px solid var(--border-color);
}

.header-content {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 48px;
}

.logo {
    display: flex;
    align-items: center;
}

.logo-img {
    height: 32px;
    /* Increased from 24px */
    width: auto;
    display: block;
}

.logo-img-small {
    height: 32px;
    /* Increased from 16px */
    opacity: 0.5;
    transition: opacity var(--transition-fast);
}

.logo-img-small:hover {
    opacity: 1;
}

/* Theme Toggle SVG Logic for Images */
[data-theme="dark"] .light-logo {
    display: none;
}

[data-theme="light"] .dark-logo {
    display: none;
}

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

[data-theme="light"] .sun-icon {
    display: none;
}

/* Icon Buttons */
.icon-button {
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: 999px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.icon-button:hover {
    background-color: var(--bg-hover);
}

.icon-button:active {
    transform: scale(0.95);
}

/* Main Content Wrapper - Edge to Edge */
.content-wrapper {
    flex: 1;
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    padding: 0;
    /* Remove padding here to allow edge-to-edge list items */
    padding-bottom: var(--space-16);
    display: flex;
    flex-direction: column;
}

.page-header {
    padding: var(--space-6) var(--space-4) var(--space-4);
    border-bottom: 0.5px solid var(--border-color);
}

.display-title {
    font-size: var(--text-display);
    font-weight: 700;
    letter-spacing: -0.5px;
    line-height: 1.25;
    margin-bottom: var(--space-2);
    color: var(--text-primary);
}

.effective-date {
    font-size: var(--text-body);
    font-weight: 400;
    color: var(--text-tertiary);
}

/* Text Content - Padding only on content elements to feel flat */
.doc-body {
    display: flex;
    flex-direction: column;
}

.intro-text {
    padding: var(--space-4) var(--space-4);
    font-size: var(--text-body);
    color: var(--text-secondary);
    margin-bottom: 0;
    border-bottom: 0.5px solid var(--border-color);
}

/* Typography styles within the doc */
.doc-section {
    padding: var(--space-4) var(--space-4);
    border-bottom: 0.5px solid var(--border-color);
}

.doc-section:last-child {
    border-bottom: none;
}

.doc-section h2 {
    font-size: var(--text-heading);
    font-weight: 600;
    letter-spacing: -0.2px;
    line-height: 1.4;
    color: var(--text-primary);
    margin-bottom: var(--space-3);
    /* No blue pipe gradient, just pure text like the screenshots */
}

.doc-section p {
    color: var(--text-secondary);
    margin-bottom: var(--space-3);
    font-size: var(--text-body);
}

.doc-section p:last-child {
    margin-bottom: 0;
}

/* Styled Lists - Flat, similar to thread items in the app */
.styled-list {
    list-style: none;
    /* Removed the blue bullets */
    display: flex;
    flex-direction: column;
}

.styled-list li {
    padding: var(--space-3) 0;
}

.styled-list li:last-child {
    padding-bottom: 0;
}

.list-content {
    color: var(--text-secondary);
    font-size: var(--text-body);
    line-height: 1.5;
}

.list-content strong {
    color: var(--text-primary);
    font-weight: 600;
    display: block;
    /* Make titles distinct like message senders */
    margin-bottom: 2px;
}

/* Links */
.accent-link {
    color: var(--text-primary);
    text-decoration: underline;
    text-decoration-color: var(--border-color);
    text-underline-offset: 4px;
    font-weight: 500;
    transition: color var(--transition-fast), text-decoration-color var(--transition-fast);
}

.accent-link:hover {
    color: var(--text-secondary);
    text-decoration-color: var(--text-secondary);
}

.footer-note {
    margin-top: var(--space-4);
    padding: var(--space-4);
    background-color: var(--bg-elevated);
    border-radius: 12px;
    text-align: left;
}

.footer-note p {
    margin-bottom: 0;
    font-size: 13px;
    color: var(--text-tertiary);
}

.bottom-branding {
    display: flex;
    justify-content: center;
    padding-top: var(--space-8);
}