/* ==========================================================================
   Variables & Tokens - Minimalist Severe Theme (Dark Default)
   ========================================================================== */
:root {
    /* Typography */
    --font-primary: 'Instrument Sans', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.5rem;
    --text-2xl: 2rem;
    --text-hero: clamp(3rem, 6vw, 6rem);
    
    --weight-light: 300;
    --weight-regular: 400;
    --weight-medium: 500;
    
    /* Colors - Dark Theme (Severe) */
    --bg-base: #050505;
    --bg-surface: #0A0A0A;
    --bg-surface-elevated: #111111;
    
    --text-primary: #FFFFFF;
    --text-secondary: #888888;
    --text-tertiary: #555555;
    
    --border-subtle: #1A1A1A;
    --border-strong: #333333;
    
    --accent: #FFFFFF;
    --accent-dim: rgba(255, 255, 255, 0.1);
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 1rem;
    --space-4: 1.5rem;
    --space-6: 2rem;
    --space-8: 3rem;
    --space-12: 4.5rem;
    --space-16: 6rem;
    --space-section: clamp(6rem, 15vh, 12rem);
    
    /* Layout */
    --container-max: 80rem; /* 1280px */
    --radius-sm: 2px;
    --radius-md: 4px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
}

/* ==========================================================================
   Reset & Base
   ========================================================================== */
*, *::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 {
    font-family: var(--font-primary);
    background-color: var(--bg-base);
    color: var(--text-primary);
    line-height: 1.5;
    font-weight: var(--weight-regular);
    overflow-x: hidden;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: #3f3f46; /* zinc-700 */
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: #52525b; /* zinc-600 */
}

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

a:hover {
    opacity: 0.6;
}

ul {
    list-style: none;
}

/* Subtle architectural grid overlay */
.grid-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: -1; /* Placed behind content */
    background-size: 100px 100px;
    background-image: 
        linear-gradient(to right, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
}

.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-4);
}

/* ==========================================================================
   Typography
   ========================================================================== */
h1, h2, h3, h4 {
    font-weight: var(--weight-regular);
    letter-spacing: -0.02em;
    line-height: 1.1;
}

/* ==========================================================================
   Components
   ========================================================================== */

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 1px solid transparent;
}

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

.btn-primary:hover {
    background-color: var(--bg-surface);
    color: var(--text-primary);
    border-color: var(--text-primary);
    opacity: 1; 
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border-color: var(--border-strong);
}

.btn-secondary:hover {
    border-color: var(--text-primary);
    opacity: 1;
}

/* Logo Mark (Stroked white triangle) */
.logo-mark {
    display: inline-block;
    width: 16px;
    height: 16px;
    margin-right: var(--space-2);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolygon points='12 3 22 21 2 21'/%3E%3C/svg%3E");
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
}

.logo-mark.small {
    width: 12px;
    height: 12px;
}

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
    position: sticky;
    top: 0;
    width: 100%;
    z-index: 100;
    background-color: rgba(5, 5, 5, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-subtle);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 4rem;
}

.logo {
    display: flex;
    align-items: center;
    font-size: var(--text-base);
    font-weight: var(--weight-medium);
    letter-spacing: -0.01em;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: var(--space-6);
    font-size: var(--text-sm);
}

.nav-cta {
    border: 1px solid var(--border-strong);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-sm);
}

.nav-cta:hover {
    border-color: var(--text-primary);
    opacity: 1;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
    padding-top: var(--space-section);
    padding-bottom: var(--space-12);
}

.hero-inner {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.hero-content {
    max-width: 48rem;
}

.hero-eyebrow {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    color: var(--text-secondary);
    margin-bottom: var(--space-4);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.hero-title {
    font-size: var(--text-hero);
    margin-bottom: var(--space-6);
}

.hero-description {
    font-size: var(--text-xl);
    color: var(--text-secondary);
    margin-bottom: var(--space-8);
    max-width: 40rem;
    line-height: 1.4;
}

.hero-actions {
    margin-bottom: var(--space-4);
    width: 100%;
    max-width: 28rem;
}

.hero-waitlist-form {
    display: flex;
    gap: var(--space-2);
    width: 100%;
}

.waitlist-input {
    flex-grow: 1;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-strong);
    color: var(--text-primary);
    padding: var(--space-3) var(--space-4);
    font-family: var(--font-primary);
    font-size: var(--text-sm);
    border-radius: var(--radius-sm);
    outline: none;
    transition: border-color var(--transition-fast);
}

.waitlist-input:focus {
    border-color: var(--text-primary);
}

.waitlist-input::placeholder {
    color: var(--text-tertiary);
}

.hero-secondary-links {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    flex-wrap: wrap;
}

.hero-meta {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

.link-muted {
    font-size: var(--text-xs);
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

/* ==========================================================================
   Glimpse Section (App UI Mockup)
   ========================================================================== */
.glimpse-section {
    padding-bottom: var(--space-section);
}

.mac-window {
    width: 100%;
    height: 75vh;
    min-height: 650px;
    background-color: #09090b; /* Changed from transparent to zinc-950 */
    border: 1px solid var(--border-strong);
    border-radius: 10px;
    display: flex;
    overflow: hidden;
    box-shadow: 0 30px 60px rgba(0,0,0,0.6), 0 0 0 1px rgba(255,255,255,0.05) inset;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* Sidebar */
.mac-sidebar {
    width: 260px;
    background-color: rgba(63, 63, 70, 0.4);
    backdrop-filter: blur(40px);
    -webkit-backdrop-filter: blur(40px);
    border-right: 1px solid rgba(255,255,255,0.05);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.mac-traffic-lights {
    display: flex;
    gap: 8px;
    padding: 18px 20px;
}

.traffic-light {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}
.traffic-light.close { background-color: #FF5F56; }
.traffic-light.min { background-color: #FFBD2E; }
.traffic-light.max { background-color: #27C93F; }

.mac-new-chat {
    margin: 0 12px 16px;
    padding: 10px 12px;
    background-color: transparent;
    border: 1px solid rgba(255,255,255,0.1);
    color: #FFF;
    border-radius: 6px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
}

.mac-new-chat:hover {
    background-color: rgba(255,255,255,0.05);
}

.mac-new-chat .shortcut {
    margin-left: auto;
    font-size: 12px;
    color: #888;
}

.mac-sidebar-scroll {
    flex-grow: 1;
    overflow-y: auto;
    padding: 0 12px;
    scrollbar-width: thin; /* Firefox */
    scrollbar-color: #3f3f46 transparent;
}

.mac-history-group {
    margin-bottom: 24px;
}

.mac-history-label {
    font-size: 12px;
    color: #888;
    margin-bottom: 8px;
    padding: 0 8px;
    font-weight: 600;
}

.mac-history-item {
    display: block;
    padding: 8px 10px;
    color: #DDD;
    font-size: 14px;
    border-radius: 6px;
    text-decoration: none;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 2px;
}

.mac-history-item:hover {
    background-color: rgba(255,255,255,0.05);
}

.mac-history-item.active {
    background-color: rgba(255,255,255,0.1);
    color: #FFF;
}

.mac-sidebar-footer {
    padding: 12px;
    border-top: 1px solid rgba(255,255,255,0.05);
}

.mac-system-status {
    font-size: 12px;
    color: #888;
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 0 8px 12px;
}

.status-dot {
    width: 8px;
    height: 8px;
    background-color: #27C93F;
    border-radius: 50%;
    box-shadow: 0 0 8px rgba(39, 201, 63, 0.4);
}

.mac-user-btn {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px;
    background: transparent;
    border: none;
    color: #FFF;
    font-size: 14px;
    border-radius: 6px;
    cursor: pointer;
}

.mac-user-btn:hover {
    background-color: rgba(255,255,255,0.05);
}

.icon-cog {
    margin-left: auto;
    color: #888;
}

/* Main Area */
.mac-main {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    background-color: #09090b;
    position: relative;
}

.mac-topbar {
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    background-color: #09090b;
}

.mac-model-selector {
    background: transparent;
    border: none;
    color: #FFF;
    font-size: 16px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    padding: 6px 12px;
    border-radius: 6px;
}

.mac-model-selector:hover {
    background-color: rgba(255,255,255,0.05);
}

.mac-model-selector .icon-chevron {
    font-size: 10px;
    color: #888;
}

.mac-chat-area {
    flex-grow: 1;
    overflow-y: auto;
    padding: 24px 0;
    display: flex;
    flex-direction: column;
    scrollbar-width: thin; /* Firefox */
    scrollbar-color: #3f3f46 transparent;
}

.mac-message {
    display: flex;
    gap: 16px;
    padding: 24px 20px;
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
}

.mac-avatar {
    width: 32px;
    height: 32px;
    border-radius: 4px;
    background-color: #444;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
    color: #FFF;
    flex-shrink: 0;
}

.mac-avatar.small {
    width: 24px;
    height: 24px;
    font-size: 12px;
}

.mac-avatar.os-logo {
    background-color: #FFF;
    color: #000;
}

.mac-avatar.os-logo .logo-mark {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolygon points='12 3 22 21 2 21'/%3E%3C/svg%3E");
    margin: 0;
    width: 16px;
    height: 16px;
}

.mac-message-content {
    flex-grow: 1;
    color: #ECECEC;
    font-size: 15px;
    line-height: 1.6;
}

.mac-message-content p {
    margin-bottom: 16px;
}

.mac-message-content code {
    background-color: rgba(255,255,255,0.1);
    padding: 2px 4px;
    border-radius: 4px;
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 0.9em;
}

.mac-code-block {
    background-color: #0D0D0D;
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 16px;
    border: 1px solid rgba(255,255,255,0.1);
}

.mac-code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 16px;
    background-color: #2A2A2A;
    font-family: ui-monospace, SFMono-Regular, monospace;
    font-size: 12px;
    color: #A3A3A3;
}

.mac-copy-btn {
    background: transparent;
    border: none;
    color: #A3A3A3;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
}

.mac-copy-btn:hover {
    color: #FFF;
}

.mac-code-block pre {
    padding: 16px;
    overflow-x: auto;
    margin: 0;
}

.mac-code-block pre code {
    background: transparent;
    padding: 0;
    color: #E2E8F0;
    font-size: 13px;
    line-height: 1.5;
}

.mac-message-actions {
    display: flex;
    gap: 8px;
    margin-top: 8px;
}

.mac-message-actions button {
    background: transparent;
    border: none;
    color: #888;
    cursor: pointer;
    font-size: 16px;
    padding: 4px;
    border-radius: 4px;
}

.mac-message-actions button:hover {
    background-color: rgba(255,255,255,0.05);
    color: #FFF;
}

/* Input Area */
.mac-input-area {
    padding: 20px 20px 32px;
    background: linear-gradient(180deg, transparent, #09090b 20%);
}

.mac-input-wrapper {
    max-width: 760px;
    margin: 0 auto;
    background-color: #18181b; /* zinc-900 */
    border-radius: 16px; /* slightly squarer for textarea look */
    display: flex;
    flex-direction: column;
    padding: 12px;
    box-shadow: 0 0 15px rgba(0,0,0,0.2);
    border: 1px solid rgba(255,255,255,0.1);
    min-height: 90px;
}

.mac-input {
    width: 100%;
    background: transparent;
    border: none;
    color: #FFF;
    font-size: 15px;
    padding: 0 4px;
    outline: none;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    resize: none;
    line-height: 1.5;
    margin-bottom: 8px;
}

.mac-input::placeholder {
    color: #a1a1aa; /* zinc-400 */
}

.mac-input-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
}

.mac-input-tools-left {
    display: flex;
    align-items: center;
    gap: 8px;
}

.mac-attach-btn {
    background: transparent;
    border: none;
    color: #a1a1aa;
    font-size: 20px;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border-radius: 8px;
}

.mac-attach-btn:hover {
    background-color: rgba(255,255,255,0.1);
    color: #FFF;
}

.mac-inline-model-selector {
    background: transparent;
    border: none;
    color: #a1a1aa;
    font-size: 13px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 4px;
    cursor: pointer;
    padding: 6px 10px;
    border-radius: 6px;
    transition: background-color 0.2s, color 0.2s;
}

.mac-inline-model-selector:hover {
    background-color: rgba(255,255,255,0.1);
    color: #FFF;
}

.mac-inline-model-selector .icon-chevron {
    font-size: 9px;
}

.mac-send-btn {
    background-color: #FFF;
    color: #09090b;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-weight: bold;
    font-size: 16px;
    transition: opacity 0.2s;
}

.mac-send-btn:hover {
    opacity: 0.9;
}

.mac-input-footer {
    text-align: center;
    font-size: 11px;
    color: #888;
    margin-top: 12px;
}

/* ==========================================================================
   Features Section
   ========================================================================== */
.features-section {
    padding-top: var(--space-8);
    padding-bottom: var(--space-section);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    border-top: 1px solid var(--border-subtle);
    border-left: 1px solid var(--border-subtle);
}

.feature-card {
    padding: var(--space-8);
    border-right: 1px solid var(--border-subtle);
    border-bottom: 1px solid var(--border-subtle);
}

.feature-number {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    margin-bottom: var(--space-12);
}

.feature-title {
    font-size: var(--text-xl);
    margin-bottom: var(--space-4);
}

.feature-description {
    color: var(--text-secondary);
    font-size: var(--text-sm);
    max-width: 24rem;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
    border-top: 1px solid var(--border-subtle);
    padding: var(--space-8) 0;
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    font-family: var(--font-mono);
}

.footer-links {
    display: flex;
    gap: var(--space-6);
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 768px) {
    .hero-title {
        font-size: clamp(2.5rem, 8vw, 4rem);
    }
    
    .hero-description {
        font-size: var(--text-lg);
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .mac-sidebar {
        display: none;
    }

    .mac-message {
        padding: 16px;
        gap: 12px;
    }
    
    .footer-inner {
        flex-direction: column;
        gap: var(--space-4);
        align-items: flex-start;
    }
}