/* ========================================
   Privacy-First AI Research Lab
   Infinite Loop Labs
   ======================================== */

/* ========================================
   CSS Variables
   ======================================== */
:root {
    /* Colors - Claude Inspired Palette */
    --bg-primary: #0F0E0D;
    --bg-secondary: #1C1A18;
    --bg-tertiary: #27241F;
    --bg-elevated: #2F2C26;

    --text-primary: #F4F3EE;
    --text-secondary: #D4D2CC;
    --text-tertiary: #B1ADA1;
    --text-muted: #8B8678;

    --accent-primary: #C15F3C;
    --accent-secondary: #A84F2F;
    --accent-muted: #8D3F22;
    --accent-light: rgba(193, 95, 60, 0.12);

    --border-subtle: rgba(177, 173, 161, 0.1);
    --border-medium: rgba(177, 173, 161, 0.15);
    --border-strong: rgba(177, 173, 161, 0.25);

    /* Typography */
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Spacing Scale - More Generous */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.5rem;
    --space-6: 2rem;
    --space-7: 2.5rem;
    --space-8: 3rem;
    --space-10: 4rem;
    --space-12: 5rem;
    --space-14: 6rem;
    --space-16: 8rem;
    --space-20: 10rem;
    --space-24: 12rem;

    /* Layout */
    --max-width: 1200px;
    --max-width-text: 680px;
    --header-height: 72px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.6);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.7);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
}

/* ========================================
   Reset & Base
   ======================================== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body.menu-open {
    overflow: hidden;
}

/* ========================================
   Typography
   ======================================== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-body);
    line-height: 1.2;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.025em;
}

h1 {
    font-weight: 700;
}

p {
    line-height: 1.7;
    color: var(--text-tertiary);
}

::selection {
    background: var(--accent-primary);
    color: var(--text-primary);
}

/* ========================================
   Layout
   ======================================== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-5);
    }
}

/* ========================================
   Header & Navigation
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--space-5) 0;
    transition: all var(--transition-base);
}

.header.scrolled {
    background: rgba(13, 13, 13, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-subtle);
    padding: var(--space-4) 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
    transition: opacity var(--transition-base);
}

.logo:hover {
    opacity: 0.8;
}

.logo-symbol {
    font-size: 1.375rem;
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}

.nav-links a {
    color: var(--text-tertiary);
    text-decoration: none;
    font-size: 0.9375rem;
    font-weight: 500;
    transition: color var(--transition-base);
    position: relative;
}

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

/* Mobile Menu */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-2);
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-base);
    border-radius: 2px;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(7px, 7px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 360px;
        height: 100vh;
        background: rgba(13, 13, 13, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: center;
        align-items: flex-start;
        padding: var(--space-8);
        gap: var(--space-6);
        border-left: 1px solid var(--border-medium);
        transition: right var(--transition-slow);
        z-index: 999;
    }

    .nav-links.active {
        right: 0;
    }

    .nav-links a {
        font-size: 1.25rem;
    }
}

/* ========================================
   Hero Section
   ======================================== */
#hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: var(--space-20) 0 var(--space-16);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    inset: 0;
    overflow: hidden;
    z-index: 0;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.15;
    pointer-events: none;
    will-change: transform;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(193, 95, 60, 0.25), transparent 70%);
    top: -150px;
    left: -150px;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(193, 95, 60, 0.18), transparent 70%);
    bottom: -100px;
    right: -100px;
}

.hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
    max-width: 820px;
    animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-2) var(--space-4);
    background: var(--accent-light);
    border: 1px solid rgba(193, 95, 60, 0.25);
    border-radius: 100px;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--accent-primary);
    margin-bottom: var(--space-6);
    letter-spacing: 0.02em;
}

.hero-title {
    font-size: clamp(2.5rem, 7vw, 4rem);
    font-weight: 700;
    margin-bottom: var(--space-6);
    line-height: 1.1;
    color: var(--text-primary);
}

.hero-subtitle {
    font-size: clamp(1.0625rem, 2vw, 1.25rem);
    color: var(--text-tertiary);
    max-width: 680px;
    margin: 0 auto var(--space-8);
    line-height: 1.7;
}

.hero-cta-group {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    flex-wrap: wrap;
}

/* ========================================
   Sections
   ======================================== */
section {
    padding: var(--space-20) 0;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

section.visible {
    opacity: 1;
    transform: translateY(0);
}

#hero {
    opacity: 1;
    transform: none;
}

.section-header {
    margin-bottom: var(--space-12);
}

.section-header.centered {
    text-align: center;
}

.section-label {
    display: inline-block;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-4);
}

.section-title {
    font-size: clamp(1.875rem, 4vw, 2.5rem);
    margin-bottom: var(--space-5);
    color: var(--text-primary);
    font-weight: 600;
}

.section-description {
    font-size: 1.0625rem;
    color: var(--text-tertiary);
    max-width: 700px;
    line-height: 1.7;
}

.section-header.centered .section-description {
    margin: 0 auto;
}

/* ========================================
   Problem Section
   ======================================== */
.insight-card {
    background: linear-gradient(135deg, rgba(193, 95, 60, 0.08), rgba(193, 95, 60, 0.03));
    border: 1px solid rgba(193, 95, 60, 0.25);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    margin-bottom: var(--space-12);
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--transition-slow);
}

.insight-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.insight-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-5);
    flex-wrap: wrap;
    gap: var(--space-3);
}

.insight-header h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    font-weight: 600;
}

.insight-label {
    font-size: 0.8125rem;
    color: var(--accent-primary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.insight-text {
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
}

.insight-implications {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.implication {
    padding: var(--space-4);
    background: rgba(0, 0, 0, 0.3);
    border-left: 3px solid var(--accent-primary);
    border-radius: var(--radius-sm);
    font-size: 0.9375rem;
    color: var(--text-tertiary);
}

.implication strong {
    color: var(--accent-primary);
    font-weight: 600;
}

@media (max-width: 768px) {
    .insight-card {
        padding: var(--space-6);
    }

    .insight-header h3 {
        font-size: 1.25rem;
    }
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-7);
}

.problem-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    opacity: 0;
    transform: translateY(15px);
    transition: all var(--transition-slow);
}

.problem-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.problem-card:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-medium);
}

.problem-card h3 {
    font-size: 1.125rem;
    margin-bottom: var(--space-3);
    color: var(--text-primary);
    font-weight: 600;
}

.problem-card p {
    color: var(--text-tertiary);
    line-height: 1.7;
    font-size: 0.9375rem;
}

@media (max-width: 968px) {
    .problem-grid {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }

    .problem-card {
        padding: var(--space-6);
    }
}

/* ========================================
   Approach Section
   ======================================== */
.approach-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-7);
    margin-bottom: var(--space-14);
}

.approach-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    transition: all var(--transition-base);
    opacity: 0;
    transform: translateY(15px);
}

.approach-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.approach-card:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-medium);
    transform: translateY(-2px);
}

.approach-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-light);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-5);
    color: var(--accent-primary);
}

.approach-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--space-3);
    color: var(--text-primary);
    font-weight: 600;
}

.approach-card p {
    color: var(--text-tertiary);
    line-height: 1.7;
    font-size: 0.9375rem;
}

.vision-statement {
    background: transparent;
    border-top: 1px solid var(--border-subtle);
    border-bottom: 1px solid var(--border-subtle);
    padding: var(--space-10) 0;
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.vision-statement p {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 1.125rem;
    margin: 0;
    font-weight: 400;
}

@media (max-width: 968px) {
    .approach-grid {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }

    .approach-card {
        padding: var(--space-6);
    }

    .vision-statement {
        padding: var(--space-8) var(--space-5);
    }
}

/* ========================================
   Contact Section
   ======================================== */
.contact-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: var(--space-14);
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.contact-content > p {
    font-size: 1.0625rem;
    margin-bottom: var(--space-8);
    color: var(--text-tertiary);
    line-height: 1.7;
}

@media (max-width: 768px) {
    .contact-card {
        padding: var(--space-10);
    }
}

/* ========================================
   Buttons
   ======================================== */
.cta-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 0.75rem 1.5rem;
    font-family: var(--font-body);
    font-size: 0.9375rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
    white-space: nowrap;
}

.cta-primary {
    background: var(--accent-primary);
    color: var(--text-primary);
}

.cta-primary:hover {
    background: var(--accent-secondary);
    transform: translateY(-1px);
}

.cta-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-medium);
}

.cta-secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-strong);
}

.cta-button.large {
    padding: 0.875rem 2rem;
    font-size: 1rem;
}

/* ========================================
   Footer
   ======================================== */
footer {
    padding: var(--space-14) 0 var(--space-10);
    border-top: 1px solid var(--border-subtle);
}

.footer-content {
    text-align: center;
}

.footer-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-4);
}

.footer-content p {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-bottom: var(--space-2);
}

.footer-copyright {
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin-top: var(--space-4);
}

/* ========================================
   Utilities
   ======================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 3px;
    border-radius: 2px;
}

::-webkit-scrollbar {
    width: 10px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-strong);
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 768px) {
    section {
        padding: var(--space-14) 0;
    }

    .section-header {
        margin-bottom: var(--space-8);
    }

    .problem-grid {
        gap: var(--space-6);
    }
}

@media (max-width: 480px) {
    :root {
        --space-20: 6rem;
        --space-16: 5rem;
        --space-14: 4.5rem;
        --space-12: 3.5rem;
        --space-10: 3rem;
    }

    section {
        padding: var(--space-12) 0;
    }

    .hero-cta-group {
        flex-direction: column;
        width: 100%;
    }

    .cta-button {
        width: 100%;
    }
}