/**
 * Anthropic Official Brand Stylesheet
 *
 * This stylesheet implements Anthropic's official brand identity including:
 * - Color palette (Dark, Light, Mid Gray, Light Gray, Orange, Blue, Green)
 * - Typography (Poppins for headings, Lora for body text)
 * - Visual standards and design patterns
 *
 * Brand Colors (RGB values):
 * - Dark: rgb(20, 20, 19) - #141413
 * - Light: rgb(250, 249, 245) - #faf9f5
 * - Mid Gray: rgb(176, 174, 165) - #b0aea5
 * - Light Gray: rgb(232, 230, 220) - #e8e6dc
 * - Orange: rgb(217, 119, 87) - #d97757
 * - Blue: rgb(106, 155, 204) - #6a9bcc
 * - Green: rgb(120, 140, 93) - #788c5d
 */

/* ============================================
   FONT IMPORTS
   ============================================ */

/* Import Poppins (headings) and Lora (body) from Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&family=Lora:wght@400;500;600;700&display=swap');

/* ============================================
   CSS CUSTOM PROPERTIES (VARIABLES)
   ============================================ */

:root {
    /* Brand Colors */
    --anthropic-dark: rgb(20, 20, 19);
    --anthropic-light: rgb(250, 249, 245);
    --anthropic-mid-gray: rgb(176, 174, 165);
    --anthropic-light-gray: rgb(232, 230, 220);
    --anthropic-orange: rgb(217, 119, 87);
    --anthropic-blue: rgb(106, 155, 204);
    --anthropic-green: rgb(120, 140, 93);

    /* P2P Agent Theme Tokens */
    --bg-primary: #faf9f5;
    --bg-secondary: #e8e6dc;
    --bg-tertiary: #f5f4ef;
    --bg-hover: #dedad0;
    --border-color: #d0cec4;
    --text-primary: #141413;
    --text-secondary: #787773;
    --text-muted: #b0aea5;
    --accent-orange: #d97757;
    --accent-blue: #6a9bcc;
    --accent-green: #788c5d;
    --dark: #141413;
    --light: #faf9f5;

    /* Typography */
    --font-heading: 'Poppins', Arial, sans-serif;
    --font-body: 'Lora', Georgia, serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(20, 20, 19, 0.1);
    --shadow-md: 0 4px 8px rgba(20, 20, 19, 0.12);
    --shadow-lg: 0 8px 16px rgba(20, 20, 19, 0.15);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

/* ============================================
   GLOBAL RESET & BASE STYLES
   ============================================ */

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

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--anthropic-dark);
    background-color: var(--anthropic-light);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.3;
    color: var(--anthropic-dark);
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
}

h2 {
    font-size: 2rem;
    font-weight: 600;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

p {
    font-family: var(--font-body);
    margin-bottom: var(--spacing-sm);
}

a {
    color: var(--anthropic-blue);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--anthropic-orange);
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
    font-family: var(--font-heading);
    font-size: 14px;
    font-weight: 500;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--anthropic-orange);
    color: var(--anthropic-light);
}

.btn-primary:hover {
    background-color: rgb(198, 100, 68);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--anthropic-blue);
    color: var(--anthropic-light);
}

.btn-secondary:hover {
    background-color: rgb(86, 135, 184);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background-color: transparent;
    color: var(--anthropic-dark);
    border: 2px solid var(--anthropic-dark);
}

.btn-outline:hover {
    background-color: var(--anthropic-dark);
    color: var(--anthropic-light);
}

/* ============================================
   HEADER & TOP BAR
   ============================================ */

.anthropic-header {
    background-color: var(--anthropic-light);
    border-bottom: 1px solid var(--anthropic-light-gray);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-xl);
    max-width: 1400px;
    margin: 0 auto;
}

.brand-logo {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--anthropic-dark);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.brand-logo:hover {
    color: var(--anthropic-orange);
}

/* ============================================
   SEARCH BAR
   ============================================ */

.search-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-grow: 1;
    max-width: 600px;
    margin: 0 var(--spacing-lg);
}

.search-box {
    position: relative;
    flex-grow: 1;
}

.search-box input {
    width: 100%;
    padding: 12px 16px;
    font-family: var(--font-body);
    font-size: 15px;
    color: var(--anthropic-dark);
    background-color: var(--anthropic-light);
    border: 2px solid var(--anthropic-light-gray);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    outline: none;
}

.search-box input:focus {
    border-color: var(--anthropic-blue);
    box-shadow: 0 0 0 3px rgba(106, 155, 204, 0.15);
}

.search-box input::placeholder {
    color: var(--anthropic-mid-gray);
}

/* ============================================
   NAVIGATION BAR
   ============================================ */

.nav-bar {
    background: linear-gradient(135deg, var(--anthropic-dark) 0%, rgb(40, 40, 38) 100%);
    padding: 0;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-around;
    align-items: center;
}

.nav-item {
    position: relative;
    padding: var(--spacing-md) var(--spacing-sm);
    font-family: var(--font-heading);
    font-size: 14px;
    font-weight: 500;
    color: var(--anthropic-light);
    cursor: pointer;
    transition: all var(--transition-normal);
    white-space: nowrap;
}

.nav-item:hover {
    background-color: rgba(217, 119, 87, 0.2);
    color: var(--anthropic-orange);
}

.nav-item::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 80%;
    height: 3px;
    background-color: var(--anthropic-orange);
    transition: transform var(--transition-normal);
}

.nav-item:hover::after {
    transform: translateX(-50%) scaleX(1);
}

.sub-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background-color: var(--anthropic-light);
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius-sm);
    overflow: hidden;
    z-index: 100;
}

.sub-menu div {
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: var(--font-body);
    font-size: 14px;
    color: var(--anthropic-dark);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.sub-menu div:hover {
    background-color: var(--anthropic-light-gray);
    color: var(--anthropic-orange);
}

.nav-item:hover .sub-menu {
    display: block;
    animation: fadeInDown var(--transition-normal);
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   MAIN CONTENT LAYOUT
   ============================================ */

.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-xl);
    display: flex;
    gap: var(--spacing-lg);
}

/* ============================================
   SEARCH RESULTS
   ============================================ */

.search-results {
    flex: 2;
    min-width: 0;
}

.results-header {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--anthropic-dark);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 3px solid var(--anthropic-orange);
}

.result-item {
    background-color: white;
    border: 1px solid var(--anthropic-light-gray);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.result-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 4px;
    height: 0;
    background: linear-gradient(to bottom, var(--anthropic-orange), var(--anthropic-blue), var(--anthropic-green));
    transition: height var(--transition-normal);
}

.result-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
    border-color: var(--anthropic-blue);
}

.result-item:hover::before {
    height: 100%;
}

.result-item p {
    margin-bottom: var(--spacing-xs);
    font-family: var(--font-body);
    color: var(--anthropic-dark);
}

.result-item strong {
    font-family: var(--font-heading);
    font-weight: 600;
    color: var(--anthropic-orange);
}

.result-label {
    font-family: var(--font-heading);
    font-size: 13px;
    font-weight: 500;
    color: var(--anthropic-mid-gray);
    margin-right: 0.5rem;
}

/* ============================================
   NETWORK SEARCH PANEL
   ============================================ */

.network-results {
    flex: 1;
    background-color: white;
    border: 1px solid var(--anthropic-light-gray);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    max-height: 800px;
    overflow-y: auto;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: calc(80px + var(--spacing-md));
}

.network-results h2 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--anthropic-dark);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--anthropic-blue);
}

.network-results .result-item {
    background-color: var(--anthropic-light);
    border-left: 3px solid var(--anthropic-green);
}

.network-results .result-item:hover {
    border-left-color: var(--anthropic-blue);
}

/* ============================================
   CUSTOM SCROLLBAR
   ============================================ */

.network-results::-webkit-scrollbar {
    width: 8px;
}

.network-results::-webkit-scrollbar-track {
    background: var(--anthropic-light-gray);
    border-radius: 4px;
}

.network-results::-webkit-scrollbar-thumb {
    background: var(--anthropic-mid-gray);
    border-radius: 4px;
    transition: background var(--transition-fast);
}

.network-results::-webkit-scrollbar-thumb:hover {
    background: var(--anthropic-blue);
}

/* ============================================
   LOADING STATES
   ============================================ */

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--anthropic-light-gray);
    border-top-color: var(--anthropic-orange);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ============================================
   UTILITY CLASSES
   ============================================ */

.text-orange { color: var(--anthropic-orange); }
.text-blue { color: var(--anthropic-blue); }
.text-green { color: var(--anthropic-green); }
.bg-light { background-color: var(--anthropic-light); }
.bg-dark { background-color: var(--anthropic-dark); color: var(--anthropic-light); }

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 1024px) {
    .main-content {
        flex-direction: column;
        padding: var(--spacing-md);
    }

    .network-results {
        position: static;
        max-height: 500px;
    }

    .header-top {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .nav-container {
        flex-wrap: wrap;
    }
}

@media (max-width: 768px) {
    .search-container {
        flex-direction: column;
        width: 100%;
        margin: var(--spacing-sm) 0;
    }

    .header-top {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .brand-logo {
        font-size: 1.5rem;
    }

    .nav-item {
        font-size: 13px;
        padding: var(--spacing-sm) var(--spacing-xs);
    }

    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }

    .results-header {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .nav-container {
        flex-direction: column;
        align-items: stretch;
    }

    .nav-item {
        text-align: center;
        border-bottom: 1px solid rgba(250, 249, 245, 0.1);
    }

    .main-content {
        padding: var(--spacing-sm);
    }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Focus visible for keyboard navigation */
*:focus-visible {
    outline: 3px solid var(--anthropic-blue);
    outline-offset: 2px;
}

button:focus-visible,
a:focus-visible,
input:focus-visible {
    outline: 3px solid var(--anthropic-blue);
    outline-offset: 2px;
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
    .nav-bar,
    .network-results {
        display: none;
    }

    body {
        background-color: white;
    }

    .result-item {
        page-break-inside: avoid;
    }
}