/* ==========================================================================
   V3XILI CORPORATION DESIGN SYSTEM (OpenAI-Inspired Sleek Theme)
   ========================================================================== */

/* Variables & Theme Tokens */
:root {
    --bg-black: #000000;
    --bg-darker: #050505;
    --bg-dark: #0a0a0b;
    --bg-panel: #111112;
    --bg-card: rgba(13, 13, 14, 0.7);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.16);
    --border-active: rgba(255, 255, 255, 0.3);
    
    --text-primary: #ffffff;
    --text-secondary: #8e8e93;
    --text-muted: #515154;
    
    /* Neon Accents for Glow Effects */
    --accent-cyan: #06b6d4;
    --accent-indigo: #6366f1;
    --accent-purple: #a855f7;
    --accent-blue: #2563eb;
    
    /* Fonts */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    
    /* Layout */
    --header-height: 72px;
    --container-max-width: 1200px;
    
    /* Transitions */
    --transition-smooth: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-fast: all 0.15s ease;
}

/* Modern CSS Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    background-color: var(--bg-black);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

.maintenance-overlay {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: grid;
    place-items: center;
    padding: 24px;
    background:
        radial-gradient(circle at 25% 20%, rgba(99, 102, 241, 0.22), transparent 35%),
        rgba(0, 0, 0, 0.96);
}

.maintenance-card {
    width: min(100%, 580px);
    padding: 44px;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    background: var(--bg-panel);
    text-align: center;
    box-shadow: 0 30px 100px rgba(0, 0, 0, 0.7);
}

.maintenance-card h1 {
    margin-bottom: 16px;
    font-size: clamp(28px, 5vw, 48px);
}

.maintenance-card p {
    color: var(--text-secondary);
    white-space: pre-wrap;
}

/* Selection highlight */
::selection {
    background-color: rgba(99, 102, 241, 0.3);
    color: var(--text-primary);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-black);
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.25);
}

/* Common Layout Components */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* Dynamic Radial Glow Background */
.interactive-glow {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 0;
    background: radial-gradient(
        600px circle at var(--mouse-x, 50%) var(--mouse-y, 30%),
        rgba(99, 102, 241, 0.12) 0%,
        rgba(6, 182, 212, 0.08) 50%,
        rgba(0, 0, 0, 0) 100%
    );
    transition: opacity 0.5s ease;
}

/* Typography & Headings */
h1, h2, h3, h4 {
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.1;
    color: var(--text-primary);
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 500;
    font-size: 0.9375rem;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition-smooth);
    white-space: nowrap;
    border: 1px solid transparent;
}

.btn-primary {
    background-color: var(--text-primary);
    color: var(--bg-black);
}

.btn-primary:hover {
    background-color: #e5e5ea;
    transform: translateY(-1px);
    box-shadow: 0 8px 20px rgba(255, 255, 255, 0.1);
}

.btn-secondary {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: var(--border-hover);
    transform: translateY(-1px);
}

.btn-outline {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-outline:hover {
    background-color: rgba(255, 255, 255, 0.06);
    border-color: var(--border-hover);
}

.btn-full {
    width: 100%;
}

/* Header & Navigation */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
    display: flex;
    align-items: center;
}

.header-container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.logo-icon {
    font-size: 1.25rem;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-indigo));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-sub {
    font-weight: 400;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    font-size: 0.875rem;
    font-weight: 400;
    color: var(--text-secondary);
    position: relative;
    padding: 8px 0;
}

.nav-link:hover {
    color: var(--text-primary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--text-primary);
    transition: var(--transition-smooth);
}

.nav-link:hover::after {
    width: 100%;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* Hamburger mobile menu button */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 22px;
    height: 16px;
    background: transparent;
    border: none;
    cursor: pointer;
}

.menu-toggle .bar {
    width: 100%;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition-smooth);
}

/* Hero Section */
.hero {
    min-height: 90vh;
    padding-top: calc(var(--header-height) + 60px);
    display: flex;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-container {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    padding: 0 24px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: rgba(99, 102, 241, 0.08);
    border: 1px solid rgba(99, 102, 241, 0.2);
    padding: 6px 14px;
    border-radius: 100px;
    margin-bottom: 24px;
    font-size: 0.8125rem;
    font-weight: 500;
    color: #c7d2fe;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.hero-badge:hover {
    background-color: rgba(99, 102, 241, 0.15);
    border-color: rgba(99, 102, 241, 0.3);
}

.hero-badge .badge-arrow {
    display: inline-block;
    transition: transform 0.2s ease;
}

.hero-badge:hover .badge-arrow {
    transform: translateX(3px);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.05;
    margin-bottom: 24px;
    background: linear-gradient(180deg, #ffffff 0%, #a1a1aa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.5;
    max-width: 640px;
    margin: 0 auto 40px;
    font-weight: 400;
}

.hero-ctas {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
}

/* Sections Global Structure */
section {
    position: relative;
    z-index: 1;
    padding: 100px 0;
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 60px;
}

.section-title {
    font-size: 2.25rem;
    margin-bottom: 16px;
}

.section-description {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* Models Grid Section */
.models-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.model-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: var(--transition-smooth);
}

.model-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3);
    background-color: rgba(20, 20, 22, 0.85);
}

.model-card-content {
    padding: 36px;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.model-icon {
    font-size: 2rem;
    margin-bottom: 20px;
}

.model-name {
    font-size: 1.35rem;
    margin-bottom: 12px;
    font-weight: 600;
}

.model-desc {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: 24px;
    flex-grow: 1;
}

.model-features {
    list-style: none;
    margin-bottom: 32px;
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
}

.model-features li {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
    position: relative;
    padding-left: 18px;
}

.model-features li::before {
    content: "•";
    color: var(--accent-indigo);
    font-size: 1.2rem;
    position: absolute;
    left: 2px;
    top: -3px;
}

.model-link {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

.model-card:hover .model-link {
    color: var(--accent-cyan);
}

/* Interactive Playground Section */
.playground-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 32px;
    background-color: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 32px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

/* Settings Panel */
.playground-settings {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.settings-title {
    font-size: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
}

.setting-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.setting-label-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.setting-label {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.setting-value {
    font-size: 0.8125rem;
    font-family: monospace;
    color: var(--accent-cyan);
}

/* Custom Controls styling */
.setting-select {
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 10px;
    border-radius: 6px;
    font-size: 0.875rem;
    outline: none;
    cursor: pointer;
    transition: var(--transition-fast);
}

.setting-select:focus {
    border-color: var(--accent-indigo);
}

.setting-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    border-radius: 2px;
    background: var(--border-color);
    outline: none;
}

.setting-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--text-primary);
    cursor: pointer;
    transition: var(--transition-fast);
}

.setting-slider::-webkit-slider-thumb:hover {
    background: var(--accent-cyan);
    transform: scale(1.15);
}

.setting-textarea {
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 10px;
    border-radius: 6px;
    font-size: 0.8125rem;
    font-family: var(--font-sans);
    resize: none;
    outline: none;
    line-height: 1.4;
}

.setting-textarea:focus {
    border-color: var(--accent-indigo);
}

/* Playground Chat Box */
.playground-chat-container {
    display: flex;
    flex-direction: column;
    height: 550px;
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
}

.chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    background-color: rgba(255, 255, 255, 0.01);
}

.chat-header-info {
    display: flex;
    align-items: center;
    gap: 8px;
}

.status-indicator {
    width: 8px;
    height: 8px;
    background-color: #10b981;
    border-radius: 50%;
    box-shadow: 0 0 8px #10b981;
}

.chat-model-name {
    font-size: 0.875rem;
    font-weight: 500;
}

.latency-indicator {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Message Box */
.chat-messages {
    flex-grow: 1;
    padding: 24px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.message {
    display: flex;
    gap: 16px;
    max-width: 85%;
    animation: fadeIn 0.3s ease-out forwards;
}

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    flex-shrink: 0;
}

.assistant-message {
    align-self: flex-start;
}

.assistant-message .message-avatar {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-indigo));
    color: var(--text-primary);
}

.user-message {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.user-message .message-avatar {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.message-content {
    background-color: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    padding: 16px 20px;
    border-radius: 8px;
    font-size: 0.9375rem;
    line-height: 1.5;
}

.user-message .message-content {
    background-color: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
}

.message-content p {
    margin-bottom: 8px;
}

.message-content p:last-child {
    margin-bottom: 0;
}

/* Custom code formatting in response */
.message-content pre {
    background-color: #050505;
    border: 1px solid var(--border-color);
    padding: 14px;
    border-radius: 6px;
    margin: 12px 0;
    overflow-x: auto;
}

.message-content code {
    font-family: monospace;
    font-size: 0.8125rem;
    color: #e5e5ea;
}

/* Suggestions Container */
.prompt-suggestions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 16px;
}

.btn-suggestion {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: 100px;
    font-size: 0.75rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn-suggestion:hover {
    color: var(--text-primary);
    border-color: var(--border-active);
    background-color: rgba(255, 255, 255, 0.02);
}

/* Chat Input styling */
.chat-input-container {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    background-color: rgba(0, 0, 0, 0.15);
}

.chat-form {
    display: flex;
    background-color: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 6px 12px;
    align-items: center;
    transition: var(--transition-fast);
}

.chat-form:focus-within {
    border-color: var(--border-active);
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.03);
}

.chat-form input {
    flex-grow: 1;
    background-color: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 0.875rem;
    padding: 10px 8px;
    outline: none;
}

.chat-form input::placeholder {
    color: var(--text-muted);
}

.btn-send-chat {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px;
    border-radius: 4px;
    transition: var(--transition-fast);
}

.chat-form input:valid + .btn-send-chat {
    color: var(--text-primary);
}

.btn-send-chat:hover {
    color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.05);
}

/* typing animation */
.typing-dots {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    height: 20px;
}

.typing-dots span {
    width: 6px;
    height: 6px;
    background-color: var(--text-secondary);
    border-radius: 50%;
    animation: typingBlink 1.4s infinite both;
}

.typing-dots span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-dots span:nth-child(3) {
    animation-delay: 0.4s;
}

/* About / Stats Section */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-title {
    font-size: 2.25rem;
    margin-bottom: 24px;
}

.about-paragraph {
    color: var(--text-secondary);
    font-size: 1.05rem;
    margin-bottom: 20px;
}

.stats-row {
    display: flex;
    gap: 36px;
    margin-top: 40px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stat-number {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

/* About Visual Terminal Box */
.about-visual-column {
    display: flex;
    justify-content: center;
}

.about-glow-box {
    width: 100%;
    max-width: 480px;
    position: relative;
}

.about-glow-box::before {
    content: '';
    position: absolute;
    top: -15px;
    left: -15px;
    right: -15px;
    bottom: -15px;
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.2), rgba(99, 102, 241, 0.2));
    filter: blur(24px);
    z-index: -1;
    border-radius: 12px;
}

.glow-box-content {
    background-color: var(--bg-darker);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
}

.terminal-header {
    background-color: #0f0f10;
    border-bottom: 1px solid var(--border-color);
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.terminal-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
}

.terminal-dot.red { background-color: #ef4444; }
.terminal-dot.yellow { background-color: #f59e0b; }
.terminal-dot.green { background-color: #10b981; }

.terminal-title {
    font-family: monospace;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-left: 8px;
}

.terminal-body {
    padding: 24px;
    font-family: monospace;
    font-size: 0.8125rem;
    line-height: 1.5;
    color: #e4e4e7;
    min-height: 220px;
}

.line-cmd {
    margin-bottom: 8px;
}

.cmd-prompt {
    color: var(--accent-cyan);
}

.line-res {
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.res-status {
    color: var(--accent-indigo);
    font-weight: bold;
}

.text-green {
    color: #10b981;
}

.cursor-blink {
    animation: blink 1s step-end infinite;
    font-weight: bold;
    color: var(--accent-cyan);
}

/* Newsletter Section */
.newsletter-section {
    padding: 80px 0;
}

.newsletter-box {
    background-color: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 60px;
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 40px;
    align-items: center;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.newsletter-title {
    font-size: 2rem;
    margin-bottom: 12px;
}

.newsletter-subtitle {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.5;
}

.newsletter-form-container {
    position: relative;
}

.newsletter-form {
    display: flex;
    gap: 12px;
}

.newsletter-form input {
    flex-grow: 1;
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 14px 18px;
    border-radius: 6px;
    font-size: 0.875rem;
    outline: none;
    transition: var(--transition-fast);
}

.newsletter-form input:focus {
    border-color: var(--border-active);
}

/* Feedback message */
.form-feedback-message {
    display: none;
    position: absolute;
    top: calc(100% + 12px);
    left: 0;
    font-size: 0.875rem;
    color: #10b981;
    animation: fadeIn 0.3s ease-out;
}

.form-feedback-message.visible {
    display: block;
}

/* Footer styling */
.footer {
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-darker);
    padding: 80px 0 40px;
    font-size: 0.875rem;
}

.footer-top {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-brand-tagline {
    color: var(--text-secondary);
    margin-top: 16px;
    max-width: 320px;
    line-height: 1.5;
}

.footer-links-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.footer-col-title {
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.footer-column ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-column ul a {
    color: var(--text-secondary);
}

.footer-column ul a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-muted);
}

.footer-bottom a {
    text-decoration: underline;
    text-underline-offset: 3px;
}

.footer-bottom a:hover {
    color: var(--text-secondary);
}

.footer-legal {
    display: flex;
    gap: 24px;
}

.footer-legal a {
    text-decoration: none;
}

/* Keyframe Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes typingBlink {
    0%, 100% { opacity: 0.2; }
    20% { opacity: 1; }
}

@keyframes blink {
    50% { opacity: 0; }
}

/* ==========================================================================
   Responsive Media Queries (Mobile First / Tablet Adapting)
   ========================================================================== */

@media (max-width: 1024px) {
    .models-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .playground-layout {
        grid-template-columns: 1fr;
        padding: 24px;
    }
    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .about-visual-column {
        order: -1; /* visual on top for tablets */
    }
    .newsletter-box {
        grid-template-columns: 1fr;
        padding: 40px;
        gap: 24px;
    }
}

@media (max-width: 768px) {
    .header-actions .btn-outline {
        display: none; /* hide header action on mobile to fit logo/nav */
    }
    
    .menu-toggle {
        display: flex;
        z-index: 101;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 100%;
        height: 100vh;
        background-color: var(--bg-black);
        flex-direction: column;
        justify-content: center;
        gap: 40px;
        transition: var(--transition-smooth);
        z-index: 100;
        padding: 40px;
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-link {
        font-size: 1.5rem;
    }

    /* Menu toggle active state (hamburger to cross) */
    .menu-toggle.active .bar:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }
    .menu-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }
    .menu-toggle.active .bar:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .models-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-top {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-links-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-ctas {
        flex-direction: column;
        width: 100%;
    }
    .hero-ctas .btn {
        width: 100%;
    }
    .newsletter-form {
        flex-direction: column;
    }
    .footer-links-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

/* ==========================================================================
   VEXILI CHAT — MARKDOWN RENDERING & CODE BLOCKS
   ========================================================================== */

/* Avatar override for new "Tú" label */
.user-message .message-avatar {
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.5px;
}

/* Markdown inside bubbles */
.message-content p { margin: 0 0 8px; line-height: 1.7; }
.message-content p:last-child { margin-bottom: 0; }
.message-content h1.md-h1,
.message-content h2.md-h2,
.message-content h3.md-h3 {
    color: #f1f5f9;
    margin: 16px 0 8px;
    font-weight: 700;
    line-height: 1.3;
}
.message-content h1.md-h1 { font-size: 18px; }
.message-content h2.md-h2 { font-size: 16px; }
.message-content h3.md-h3 { font-size: 14px; color: #a5b4fc; }

.message-content ul.md-list {
    list-style: none;
    padding: 0;
    margin: 8px 0;
}
.message-content ul.md-list li {
    padding: 4px 0 4px 16px;
    position: relative;
    font-size: 14px;
    color: #94a3b8;
    line-height: 1.6;
}
.message-content ul.md-list li::before {
    content: '›';
    position: absolute;
    left: 0;
    color: #6366f1;
    font-weight: 700;
}

/* Inline code */
code.inline-code {
    background: rgba(99,102,241,0.12);
    border: 1px solid rgba(99,102,241,0.2);
    color: #a5b4fc;
    padding: 2px 6px;
    border-radius: 5px;
    font-family: 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
    font-size: 12.5px;
}

/* Code block container */
.code-block-wrapper {
    background: #0d0d10;
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 10px;
    margin: 12px 0;
    overflow: hidden;
}
.code-block-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 14px;
    background: rgba(255,255,255,0.04);
    border-bottom: 1px solid rgba(255,255,255,0.06);
}
.code-lang {
    font-size: 11px;
    font-weight: 600;
    color: #6366f1;
    text-transform: uppercase;
    letter-spacing: 0.8px;
}
.btn-copy-code {
    background: rgba(99,102,241,0.15);
    border: 1px solid rgba(99,102,241,0.25);
    color: #a5b4fc;
    font-size: 11px;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
}
.btn-copy-code:hover {
    background: rgba(99,102,241,0.3);
    color: #fff;
}
.code-block-wrapper pre {
    margin: 0;
    padding: 16px;
    overflow-x: auto;
}
.code-block-wrapper pre code {
    font-family: 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
    font-size: 13px;
    line-height: 1.65;
    color: #e2e8f0;
    background: none;
    border: none;
    padding: 0;
}

/* Disabled state while generating */
#chat-input-text:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}
#btn-send-message:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}