/*
   ==============================================
   AiQue | v2 Landing Page (Fixed)
   ==============================================
*/

/* --- Base & Variables --- */
:root {
    --c-bg: #050505;
    --c-surface: #111111;
    --c-surface-light: #1a1a1a;
    --c-text-primary: #f5f5f7;
    --c-text-secondary: #a1a1aa;
    --c-accent: #a855f7;
    --c-accent-hover: #9333ea;
    --c-accent-glow: rgba(168, 85, 247, 0.2);
    --c-border: rgba(255, 255, 255, 0.1);
    --c-focus: #60a5fa; 
    --c-error: #ef4444;
    --c-success: #10b981;

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-heading: 'Manrope', sans-serif;
    
    --transition-fast: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    --transition-slow: all 0.6s cubic-bezier(0.25, 0.8, 0.25, 1);
    --border-radius: 12px;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
}

/* --- Reset & Defaults --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    max-width: 100%;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
    width: 100%;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

body {
    background-color: var(--c-bg);
    color: var(--c-text-primary);
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    width: 100%;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.skip-nav {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--c-accent);
    color: var(--c-text-primary);
    padding: 8px;
    text-decoration: none;
    border-radius: 4px;
    font-weight: 600;
    z-index: 1000;
    transition: top 0.3s;
}

.skip-nav:focus {
    top: 6px;
}

.loading-spinner {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--c-bg);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    opacity: 1;
    transition: opacity 0.5s ease;
}

.loading-spinner.hidden {
    opacity: 0;
    pointer-events: none;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--c-border);
    border-top: 3px solid var(--c-accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-spinner p {
    color: var(--c-text-secondary);
    font-size: 0.9rem;
}

*:focus {
    outline: 2px solid var(--c-focus);
    outline-offset: 2px;
}

button:focus,
a:focus,
input:focus,
select:focus,
textarea:focus {
    outline: 2px solid var(--c-focus);
    outline-offset: 2px;
}

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

.header {
    position: sticky;
    top: 0;
    background: linear-gradient(180deg, rgba(5, 5, 5, 0.95) 0%, rgba(5, 5, 5, 0.7) 80%, rgba(5, 5, 5, 0) 100%);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 100;
    padding: var(--spacing-md) 0;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg);
}

.logo-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
}

.logo {
    height: 28px;
    width: auto;
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--c-text-primary);
    transition: var(--transition-fast);
}

.logo-container:hover .logo-text {
    color: var(--c-accent);
}

.nav-cta {
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity 0.4s ease, transform 0.4s ease;
    pointer-events: none;
}

.nav-cta.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.cta-button {
    background-color: var(--c-accent);
    color: var(--c-text-primary);
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition-fast);
    box-shadow: 0 0 20px 0 var(--c-accent-glow);
    border: none;
    cursor: pointer;
    font-size: 1rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px; 
    min-width: 44px;
    touch-action: manipulation;
    user-select: none;
    -webkit-user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.cta-button:hover,
.cta-button:focus {
    background-color: var(--c-accent-hover);
    transform: translateY(-2px);
    filter: brightness(1.1);
}

.cta-button:active {
    transform: translateY(0);
}

@media (hover: none) and (pointer: coarse) {
    .cta-button:hover {
        transform: none;
        filter: none;
    }
    
    .cta-button:active {
        background-color: var(--c-accent-hover);
        transform: scale(0.98);
    }
}

.hero {
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-3xl) 0;
}

.hero-content {
    max-width: 700px;
}

.headline {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 8vw, 5.5rem);
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1.1;
    margin-bottom: var(--spacing-sm);
}

.sub-headline {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 6vw, 4.5rem);
    font-weight: 700;
    letter-spacing: -0.04em;
    line-height: 1.1;
    color: var(--c-text-secondary);
    margin-bottom: var(--spacing-lg);
}

.hero-description {
    font-size: clamp(1rem, 2.5vw, 1.1rem);
    color: var(--c-text-secondary);
    max-width: 550px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.6;
}

.hero-cta {
    font-size: 1.1rem;
}

.signal-visual {
    width: 120px;
    height: 120px;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    margin: 0 auto var(--spacing-lg);
}

.signal-pulse {
    width: 20px;
    height: 20px;
    background-color: var(--c-accent);
    border-radius: 50%;
    position: relative;
    box-shadow: 0 0 20px 5px var(--c-accent-glow);
}

.signal-pulse::before,
.signal-pulse::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: var(--c-accent);
    opacity: 0;
    animation: pulse 3s infinite cubic-bezier(0.4, 0, 0.6, 1);
}

.signal-pulse::after {
    animation-delay: 1.5s;
}

@keyframes pulse {
    0% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 0.6;
    }
    100% {
        transform: translate(-50%, -50%) scale(6);
        opacity: 0;
    }
}

/* --- Section Headers --- */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-header h2 {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.section-header p {
    color: var(--c-text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

.features {
    padding: var(--spacing-3xl) 0;
    min-height: 80vh;
}

.chat-container {
    max-width: 700px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.chat-bubble {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: 20px;
    max-width: 85%;
    line-height: 1.6;
    opacity: 1; 
    transform: translateY(0);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.chat-bubble.user {
    background-color: var(--c-accent);
    color: var(--c-text-primary);
    align-self: flex-end;
    border-bottom-right-radius: 5px;
}

.chat-bubble.bot {
    background-color: var(--c-surface);
    border: 1px solid var(--c-border);
    align-self: flex-start;
    border-bottom-left-radius: 5px;
}

.chat-bubble code {
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    background-color: rgba(0,0,0,0.3);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9rem;
}

.chat-bubble.user code {
    background-color: transparent;
    padding: 0;
    border-radius: 0;
}

.chat-bubble.bot pre {
    white-space: pre-wrap;
    word-wrap: break-word;
    background-color: rgba(0,0,0,0.3);
    border-radius: 8px;
    padding: var(--spacing-md);
    font-size: 0.85rem;
    margin-top: var(--spacing-sm);
}

.chat-bubble strong {
    color: var(--c-accent);
}

.chat-bubble.file {
    background-color: transparent;
    border: none;
    padding: 0;
}

.file-attachment {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background-color: var(--c-surface);
    border: 1px solid var(--c-border);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    max-width: 350px;
    transition: var(--transition-fast);
    width: 100%;
    box-sizing: border-box;
}

.file-attachment:hover {
    border-color: var(--c-accent);
}

.file-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    background-color: var(--c-accent);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    color: var(--c-text-primary);
}

.file-info {
    flex-grow: 1;
    text-align: left;
    min-width: 0;
    overflow: hidden;
}

.file-info .filename {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--c-text-primary);
    word-break: break-all;
    overflow-wrap: anywhere;
    line-height: 1.3;
}

.file-info .filesize, 
.file-info .caption {
    font-size: 0.9rem;
    color: var(--c-text-secondary);
    word-wrap: break-word;
}

.file-info .caption {
    margin-top: var(--spacing-sm);
}

.file-download {
    color: var(--c-text-secondary);
    font-size: 1.5rem;
    transition: var(--transition-fast);
    text-decoration: none;
    min-height: 44px;
    min-width: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.file-download:hover,
.file-download:focus {
    color: var(--c-accent);
    transform: scale(1.1);
}

.fallback-content {
    background-color: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    text-align: center;
}

.fallback-content h3 {
    color: var(--c-accent);
    margin-bottom: var(--spacing-md);
}

.fallback-content ul {
    list-style: none;
    padding: 0;
}

.fallback-content li {
    padding: var(--spacing-sm) 0;
    color: var(--c-text-secondary);
}

.fallback-content li::before {
    content: "✓ ";
    color: var(--c-accent);
    font-weight: bold;
}

/* --- Footer --- */
.footer {
    padding: var(--spacing-xl) 0;
    text-align: center;
    color: var(--c-text-secondary);
    font-size: 0.9rem;
    border-top: 1px solid var(--c-border);
    margin-top: var(--spacing-3xl);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.social-nav ul {
    list-style: none;
    display: flex;
    gap: var(--spacing-md);
}

.social-links a {
    color: var(--c-text-secondary);
    text-decoration: none;
    transition: var(--transition-fast);
    padding: var(--spacing-sm);
    min-height: 44px;
    display: flex;
    align-items: center;
}

.social-links a:hover,
.social-links a:focus {
    color: var(--c-accent);
}

.ens-link {
    color: var(--c-accent);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
}

.ens-link:hover,
.ens-link:focus {
    color: var(--c-accent-hover);
    text-decoration: underline;
}

/* --- Responsive Design (Mobile First) --- */

/* Prevent horizontal overflow on all screen sizes */
* {
    max-width: 100%;
    box-sizing: border-box;
}

html, body {
    overflow-x: hidden;
    width: 100%;
}

/* Small devices (landscape phones, 576px and up) */
@media (min-width: 36rem) {
    .container {
        padding: 0 var(--spacing-lg);
    }
}

/* Medium devices (tablets, 768px and up) */
@media (min-width: 48rem) {
    .container {
        padding: 0 var(--spacing-xl);
    }
    
    .header-content {
        gap: var(--spacing-xl);
    }
    
    .hero {
        min-height: 90vh;
    }

    .footer-content {
        flex-direction: row;
        justify-content: space-between;
    }
}

/* Large devices (desktops, 992px and up) */
@media (min-width: 62rem) {
    .container {
        padding: 0 var(--spacing-2xl);
    }
    
    .nav-links {
        gap: var(--spacing-2xl);
    }
    
    .section-header {
        margin-bottom: var(--spacing-3xl);
    }
}

/* Extra large devices (large desktops, 1200px and up) */
@media (min-width: 75rem) {
    .hero-content {
        max-width: 800px;
    }
    
    .chat-container {
        max-width: 800px;
    }
}

/* Mobile-specific file attachment improvements */
@media (max-width: 48rem) {
    .file-attachment {
        max-width: 100%;
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .file-info {
        width: 100%;
    }
    
    .file-info .filename {
        font-size: 0.9rem;
        word-break: break-word;
        hyphens: auto;
    }
    
    .chat-bubble {
        max-width: 95%;
    }
    
    .chat-container {
        padding: 0 var(--spacing-sm);
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --c-text-secondary: #ffffff;
        --c-border: rgba(255, 255, 255, 0.3);
    }
}