/* ==========================================================================
   Quark Constructs Website Styles
   ========================================================================== */

/* CSS Reset / Normalize
   ========================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
}

ul {
    list-style: none;
}

a {
    text-decoration: none;
    color: inherit;
}

/* CSS Custom Properties
   ========================================================================== */
:root {
    /* Brand Colors */
    --color-navy: #223843;
    --color-cyan: #00d9ff;
    --color-cyan-dark: #00a3c4;
    --color-white: #ffffff;
    --color-gray-light: #f5f7f8;
    --color-gray-medium: #6b7280;
    --color-near-black: #1a2e38;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    --font-mono: 'Fira Code', 'JetBrains Mono', monospace;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 5rem;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Transitions */
    --transition-fast: 200ms ease;
    --transition-base: 300ms ease;
}

/* Base Styles
   ========================================================================== */
body {
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: 400;
    color: var(--color-near-black);
    background-color: var(--color-white);
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: clamp(3rem, 8vw, 7.5rem); /* 72-120px oversized hero headlines */
    font-weight: 800;
    letter-spacing: -0.02em; /* Tighter tracking for large type */
    line-height: 1.1;
}

h2 {
    font-size: clamp(2.5rem, 6vw, 4rem); /* 48-64px bold section headlines */
    font-weight: 700;
    letter-spacing: -0.015em;
    line-height: 1.15;
}

h3 {
    font-size: clamp(1.5rem, 3vw, 1.75rem); /* 24-28px subsection titles */
    font-weight: 600;
    line-height: 1.3;
}

p {
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

p:last-child {
    margin-bottom: 0;
}

strong {
    font-weight: 600;
}

/* Layout Utilities
   ========================================================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: 5rem 0;
}

.section-headline {
    text-align: left;
    margin-bottom: var(--spacing-2xl);
    position: relative;
}

.section-content {
    max-width: 800px;
    margin: 0 auto;
    font-size: 1.125rem;
}

.section-intro {
    text-align: center;
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
}

/* Navigation
   ========================================================================== */
.header {
    background-color: var(--color-near-black);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    border-bottom: 2px solid var(--color-cyan);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-md);
    min-height: 90px;
}

.nav-logo a {
    display: flex;
    flex-direction: row;
    align-items: baseline;
    gap: var(--spacing-sm);
    line-height: 1;
    text-decoration: none;
}

.logo-quark {
    font-family: var(--font-primary);
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-white);
    letter-spacing: 0.05em;
}

.logo-constructs {
    font-family: var(--font-mono);
    font-size: 1.125rem;
    font-weight: 400;
    color: var(--color-cyan);
    letter-spacing: 0.1em;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-xl);
    align-items: center;
}

.nav-link {
    color: var(--color-white);
    font-weight: 500;
    font-size: 1rem;
    transition: color var(--transition-fast);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--spacing-xs);
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--color-white);
    transition: all var(--transition-base);
}

/* Hero Section
   ========================================================================== */
.hero {
    min-height: 85vh;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    background: var(--color-navy);
    clip-path: polygon(0 0, 100% 0, 100% 96%, 0 100%); /* Angled bottom */
}

.hero .container {
    display: grid;
    grid-template-columns: 40% 60%;
    gap: var(--spacing-3xl);
    align-items: center;
    padding-top: var(--spacing-3xl);
    padding-bottom: var(--spacing-3xl);
}

.hero-content {
    text-align: left;
    position: relative;
    z-index: 2;
}

/* Cyan accent bar above headline */
.hero-content::before {
    content: '';
    display: block;
    width: 120px;
    height: 6px;
    background: var(--color-cyan);
    margin-bottom: var(--spacing-lg);
}

.hero-headline {
    color: var(--color-white);
    margin-bottom: var(--spacing-lg);
    text-transform: uppercase;
    font-size: clamp(2rem, 5vw, 4rem);
    line-height: 1.15;
}

.hero-subheadline {
    font-size: clamp(1.125rem, 2vw, 1.375rem);
    line-height: 1.5;
    margin-bottom: var(--spacing-2xl);
    color: rgba(255, 255, 255, 0.9);
    max-width: 540px;
}

/* Right side: robot excavator image with cyan accent */
.hero-visual {
    position: relative;
    height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Cyan accent shape behind image */
.hero-visual::before {
    content: '';
    position: absolute;
    width: 450px;
    height: 450px;
    background: linear-gradient(135deg, var(--color-cyan) 0%, rgba(0, 217, 255, 0.4) 100%);
    transform: rotate(45deg);
    opacity: 0.2;
    z-index: 1;
}

.hero-image {
    position: relative;
    z-index: 2;
    max-width: 100%;
    height: auto;
    max-height: 480px;
    object-fit: contain;
    filter: drop-shadow(0 10px 40px rgba(0, 217, 255, 0.3));
}

/* About page hero variant */
.hero-about {
    min-height: 50vh;
    clip-path: polygon(0 0, 100% 0, 100% 93%, 0 100%);
}

.hero-about .container {
    grid-template-columns: 1fr;
    text-align: center;
}

.hero-about .hero-content::before {
    margin-left: auto;
    margin-right: auto;
}

/* Buttons
   ========================================================================== */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    transition: all var(--transition-fast);
    text-align: center;
    min-width: 180px;
}

.btn-primary {
    background-color: var(--color-cyan);
    color: var(--color-navy);
}

.btn-primary:hover {
    background-color: var(--color-cyan-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 217, 255, 0.3);
}

.btn-secondary {
    background-color: transparent;
    border: 2px solid var(--color-cyan);
    color: var(--color-cyan);
}

.btn-secondary:hover {
    background-color: var(--color-cyan);
    color: var(--color-navy);
}

/* Problem Section
   ========================================================================== */
.problem-section {
    background-color: var(--color-gray-light);
    position: relative;
    clip-path: polygon(0 4%, 100% 0, 100% 96%, 0 100%); /* Angled top and bottom */
    padding-top: 8rem !important;
    padding-bottom: 8rem !important;
}

.problem-section .container {
    max-width: 1000px;
}

.problem-section .section-headline {
    color: var(--color-navy);
    text-align: left;
    position: relative;
    padding-left: 0;
    margin-bottom: var(--spacing-2xl);
}

/* Cyan accent bar beside headline */
.problem-section .section-headline::before {
    content: '';
    position: absolute;
    left: 0;
    top: -20px;
    width: 100px;
    height: 6px;
    background: var(--color-cyan);
}

.problem-section .section-content {
    max-width: 700px; /* Asymmetric: content pushed left */
    margin: 0; /* Not centered */
}

.problem-section .emphasis {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-cyan);
    margin-top: var(--spacing-xl);
}

/* Solution Section
   ========================================================================== */
.solution-section {
    background-color: var(--color-white);
    color: var(--color-near-black);
    position: relative;
    clip-path: polygon(0 4%, 100% 0, 100% 100%, 0 100%); /* Angled top */
    padding-top: 8rem !important;
}

.solution-section .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: start;
}

.solution-section .section-headline {
    color: var(--color-navy);
    text-align: left;
    margin-bottom: var(--spacing-lg);
    grid-column: 1 / -1;
}

.solution-section .section-content {
    color: var(--color-near-black);
}

.how-it-works {
    position: relative;
}

.subsection-headline {
    font-size: 2rem;
    margin-bottom: var(--spacing-lg);
    color: var(--color-navy);
}

.steps-list {
    list-style: none;
    counter-reset: step-counter;
}

.steps-list li {
    counter-increment: step-counter;
    position: relative;
    padding-left: 4.5rem;
    margin-bottom: var(--spacing-xl);
    font-size: 1.125rem;
    color: var(--color-near-black);
}

.steps-list li::before {
    content: counter(step-counter);
    position: absolute;
    left: 0;
    top: -8px;
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-cyan);
    line-height: 1;
}

/* Specs Section
   ========================================================================== */
.specs-section {
    background: linear-gradient(135deg, var(--color-near-black) 0%, var(--color-navy) 100%);
    color: var(--color-white);
    position: relative;
    margin-top: -60px; /* Overlap effect */
    padding-top: 7rem !important;
}

.specs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
    max-width: 1000px;
    margin: 0 auto;
}

.specs-card {
    background-color: rgba(255, 255, 255, 0.03);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(0, 217, 255, 0.3);
    transition: all var(--transition-base);
    backdrop-filter: blur(10px);
}

.specs-card:hover {
    transform: translateY(-8px);
    border-color: var(--color-cyan);
    box-shadow: 0 12px 40px rgba(0, 217, 255, 0.3);
    background-color: rgba(255, 255, 255, 0.05);
}

.card-headline {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
    color: var(--color-cyan);
    font-weight: 700;
}

.specs-list {
    list-style: none;
}

.specs-list li {
    padding: var(--spacing-sm) 0;
    font-size: 1.0625rem;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.9);
}

.specs-list li strong {
    color: var(--color-cyan);
    font-weight: 600;
}

/* Use Cases Section
   ========================================================================== */
.use-cases-section {
    background-color: var(--color-gray-light);
    position: relative;
}

.use-cases-section .section-headline {
    color: var(--color-navy);
    text-align: center;
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.use-case-card {
    background-color: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border-top: 4px solid var(--color-cyan);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: all var(--transition-base);
    position: relative;
}

.use-case-card::before {
    content: '';
    position: absolute;
    top: -4px;
    left: 0;
    width: 0;
    height: 4px;
    background: var(--color-cyan);
    transition: width var(--transition-base);
}

.use-case-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 40px rgba(0, 217, 255, 0.25);
}

.use-case-card:hover::before {
    width: 100%;
}

.use-case-card h3 {
    font-size: 1.375rem;
    color: var(--color-navy);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.use-case-card p {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-gray-medium);
}

/* Mission & Beliefs Sections
   ========================================================================== */
.mission-section {
    background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-near-black) 100%);
    color: var(--color-white);
    position: relative;
    clip-path: polygon(0 3%, 100% 0, 100% 97%, 0 100%);
    padding-top: 8rem !important;
    padding-bottom: 8rem !important;
}

.mission-section .section-headline {
    color: var(--color-white);
    text-align: center;
    position: relative;
}

.mission-section .section-headline::before {
    content: '';
    display: block;
    width: 100px;
    height: 6px;
    background: var(--color-cyan);
    margin: 0 auto var(--spacing-lg);
}

.mission-section .section-content {
    color: var(--color-white);
    text-align: center;
}

.mission-statement {
    font-size: 1.75rem;
    font-weight: 600;
    line-height: 1.5;
    margin-bottom: var(--spacing-xl);
    color: var(--color-cyan);
}

.beliefs-section {
    background-color: var(--color-white);
}

.beliefs-section .section-headline {
    text-align: center;
}

.beliefs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-2xl);
}

.belief-card {
    background-color: var(--color-white);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    border-left: 6px solid var(--color-cyan);
    transition: all var(--transition-base);
    position: relative;
}

.belief-card::before {
    content: '';
    position: absolute;
    left: -6px;
    top: 0;
    width: 6px;
    height: 0;
    background: var(--color-navy);
    transition: height var(--transition-base);
}

.belief-card:hover {
    transform: translateX(8px);
    box-shadow: 0 12px 40px rgba(0, 217, 255, 0.25);
}

.belief-card:hover::before {
    height: 100%;
}

.belief-card h3 {
    font-size: 1.375rem;
    color: var(--color-navy);
    margin-bottom: var(--spacing-lg);
    line-height: 1.35;
    font-weight: 600;
}

.belief-card p {
    color: var(--color-gray-medium);
    line-height: 1.7;
    font-size: 1.0625rem;
}

/* Contact Section
   ========================================================================== */
.contact-section {
    background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-near-black) 100%);
    color: var(--color-white);
    position: relative;
}

.contact-section .section-headline {
    color: var(--color-white);
    text-align: center;
    position: relative;
}

.contact-section .section-headline::before {
    content: '';
    display: block;
    width: 100px;
    height: 6px;
    background: var(--color-cyan);
    margin: 0 auto var(--spacing-lg);
}

.contact-section .section-intro {
    color: rgba(255, 255, 255, 0.9);
    text-align: center;
}

.contact-form {
    max-width: 600px;
    margin: 0 auto;
    background-color: rgba(255, 255, 255, 0.05);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(0, 217, 255, 0.3);
    backdrop-filter: blur(10px);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-white);
}

.required {
    color: var(--color-cyan);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-sm);
    font-family: var(--font-primary);
    font-size: 1rem;
    background-color: rgba(255, 255, 255, 0.08);
    color: var(--color-white);
    transition: all var(--transition-fast);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-cyan);
    background-color: rgba(255, 255, 255, 0.12);
    box-shadow: 0 0 0 3px rgba(0, 217, 255, 0.3);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.contact-form .btn {
    width: 100%;
    margin-top: var(--spacing-md);
}

/* Footer
   ========================================================================== */
.footer {
    background-color: var(--color-near-black);
    color: var(--color-white);
    padding: var(--spacing-2xl) 0;
    text-align: center;
}

.footer p {
    margin-bottom: var(--spacing-sm);
}

.footer a {
    color: var(--color-cyan);
    transition: color var(--transition-fast);
}

.footer a:hover {
    color: var(--color-cyan-dark);
}

/* Responsive Design
   ========================================================================== */

/* Tablet (640px - 1024px) */
@media (max-width: 1024px) {
    .section {
        padding: 4rem 0;
    }

    .hero {
        padding: 6rem 0 4rem;
    }

    .specs-grid,
    .use-cases-grid,
    .beliefs-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: var(--spacing-lg);
    }
}

/* Mobile (<640px) */
@media (max-width: 640px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    /* Logo responsive sizing */
    .logo-quark {
        font-size: 1.5rem;
    }

    .logo-constructs {
        font-size: 0.875rem;
    }

    .section {
        padding: 3rem 0;
    }

    /* Hero mobile adjustments */
    .hero {
        min-height: auto;
        padding: 4rem 0 3rem;
        clip-path: none;
    }

    .hero .container {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
        padding-top: var(--spacing-xl);
        padding-bottom: var(--spacing-xl);
    }

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

    .hero-content::before {
        margin-left: auto;
        margin-right: auto;
        width: 80px;
    }

    .hero-headline {
        font-size: 2.5rem;
        text-transform: none;
    }

    .hero-subheadline {
        font-size: 1.125rem;
    }

    .hero-visual {
        height: 300px;
        margin-top: var(--spacing-lg);
    }

    .hero-image {
        max-height: 280px;
    }

    h2 {
        font-size: 2rem;
    }

    h3 {
        font-size: 1.25rem;
    }

    .section-content {
        font-size: 1rem;
    }

    /* Section adjustments for mobile */
    .problem-section,
    .solution-section,
    .mission-section {
        clip-path: none;
        padding-top: 3rem !important;
        padding-bottom: 3rem !important;
    }

    .solution-section .container {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .specs-section {
        margin-top: 0;
        padding-top: 3rem !important;
    }

    .subsection-headline {
        font-size: 1.5rem;
    }

    .steps-list li {
        padding-left: 3.5rem;
        margin-bottom: var(--spacing-lg);
    }

    .steps-list li::before {
        font-size: 2rem;
    }

    /* Mobile Navigation */
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 90px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 90px);
        background-color: var(--color-near-black);
        flex-direction: column;
        justify-content: flex-start;
        padding: var(--spacing-2xl) 0;
        transition: left var(--transition-base);
        gap: var(--spacing-lg);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-link {
        font-size: 1.25rem;
    }

    /* Toggle animation */
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

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

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

    .specs-grid,
    .use-cases-grid,
    .beliefs-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .btn {
        width: 100%;
    }

    .steps-list li {
        font-size: 1rem;
    }
}

/* Scroll-Triggered Animations
   ========================================================================== */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

.animate-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Hero entrance animations */
.hero-headline,
.hero-subheadline,
.hero .btn {
    opacity: 0;
    transition: opacity 0.6s ease-out;
}

/* Accessibility & Motion
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }

    .animate-on-scroll,
    .hero-headline,
    .hero-subheadline,
    .hero .btn {
        opacity: 1 !important;
        transform: none !important;
    }
}

/* Focus visible styles for keyboard navigation */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 3px solid var(--color-cyan);
    outline-offset: 2px;
}