/* ============================================
   Helium Studio — Design System
   ============================================ */

/* CSS Variables — Copper & Slate Palette */
:root {
    /* Colors */
    --color-primary: #B87333;
    --color-primary-light: #D4A574;
    --color-primary-dark: #8B5A2B;
    --color-slate: #2F3640;
    --color-slate-light: #4A5568;
    --color-cream: #F5F0EB;
    --color-cream-dark: #E8E0D5;
    --color-white: #FFFFFF;
    --color-black: #1A1A1A;
    
    /* Typography */
    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Font Sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;
    --text-7xl: 4.5rem;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    --space-32: 8rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;
}

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

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

body {
    font-family: var(--font-body);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--color-slate);
    background-color: var(--color-cream);
    overflow-x: hidden;
}

img, picture, video, canvas, svg {
    display: block;
    max-width: 100%;
}

input, button, textarea, select {
    font: inherit;
}

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

ul, ol {
    list-style: none;
}

/* Container */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

@media (min-width: 640px) {
    .container {
        padding: 0 var(--space-8);
    }
}

@media (min-width: 1024px) {
    .container {
        padding: 0 var(--space-12);
    }
}

/* ============================================
   Navigation
   ============================================ */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: var(--space-4) 0;
    transition: background-color var(--transition-base), 
                backdrop-filter var(--transition-base),
                box-shadow var(--transition-base);
}

.nav--scrolled {
    background-color: rgba(245, 240, 235, 0.9);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

@media (min-width: 640px) {
    .nav-container {
        padding: 0 var(--space-8);
    }
}

@media (min-width: 1024px) {
    .nav-container {
        padding: 0 var(--space-12);
    }
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-weight: 600;
    color: var(--color-slate);
}

.logo-mark {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--color-primary);
    color: var(--color-white);
    font-family: var(--font-display);
    font-size: var(--text-lg);
    border-radius: var(--radius-md);
}

.logo-text {
    font-size: var(--text-lg);
    font-weight: 600;
}

.nav-toggle {
    display: flex;
    flex-direction: column;
    gap: 6px;
    width: 32px;
    height: 32px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-slate);
    transition: transform var(--transition-base), opacity var(--transition-base);
    transform-origin: center;
}

.nav-toggle--active span:first-child {
    transform: translateY(4px) rotate(45deg);
}

.nav-toggle--active span:last-child {
    transform: translateY(-4px) rotate(-45deg);
}

@media (min-width: 768px) {
    .nav-toggle {
        display: none;
    }
}

.nav-menu {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-cream);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-8);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity var(--transition-base), 
                visibility var(--transition-base),
                transform var(--transition-base);
}

.nav-menu--active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

@media (min-width: 768px) {
    .nav-menu {
        position: static;
        flex-direction: row;
        background: transparent;
        opacity: 1;
        visibility: visible;
        transform: none;
        gap: var(--space-8);
    }
}

.nav-link {
    font-size: var(--text-lg);
    font-weight: 500;
    color: var(--color-slate);
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition-base);
}

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

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

@media (min-width: 768px) {
    .nav-link {
        font-size: var(--text-sm);
    }
}

.nav-link--cta {
    background: var(--color-slate);
    color: var(--color-white);
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-full);
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.nav-link--cta::after {
    display: none;
}

.nav-link--cta:hover {
    background: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-24) var(--space-6);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: -1;
}

.hero-gradient {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, 
        var(--color-cream) 0%, 
        var(--color-cream-dark) 50%,
        rgba(184, 115, 51, 0.1) 100%
    );
}

.hero-noise {
    position: absolute;
    inset: 0;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

.hero-content {
    text-align: center;
    max-width: 900px;
    animation: fadeInUp 1s ease-out;
}

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

.hero-eyebrow {
    font-size: var(--text-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--color-primary);
    margin-bottom: var(--space-4);
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 600;
    line-height: 1.1;
    color: var(--color-slate);
    margin-bottom: var(--space-6);
}

.hero-line {
    display: block;
}

.hero-line--accent {
    color: var(--color-primary);
    position: relative;
}

.hero-line--accent::after {
    content: '';
    position: absolute;
    bottom: 0.1em;
    left: -0.1em;
    right: -0.1em;
    height: 0.15em;
    background: rgba(184, 115, 51, 0.2);
    z-index: -1;
}

.hero-description {
    font-size: var(--text-lg);
    color: var(--color-slate-light);
    max-width: 600px;
    margin: 0 auto var(--space-8);
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    align-items: center;
}

@media (min-width: 480px) {
    .hero-actions {
        flex-direction: row;
        justify-content: center;
    }
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-base);
    font-weight: 600;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
}

.btn--primary {
    background: var(--color-primary);
    color: var(--color-white);
    box-shadow: 0 4px 14px rgba(184, 115, 51, 0.3);
}

.btn--primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(184, 115, 51, 0.4);
}

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

.btn--secondary:hover {
    background: var(--color-slate);
    color: var(--color-white);
    transform: translateY(-2px);
}

.btn--full {
    width: 100%;
}

/* Scroll Indicator */
.hero-scroll {
    position: absolute;
    bottom: var(--space-8);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    opacity: 0.6;
}

.scroll-text {
    font-size: var(--text-xs);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-slate-light);
}

.scroll-line {
    width: 1px;
    height: 60px;
    background: linear-gradient(to bottom, var(--color-slate), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.3; transform: scaleY(0.5); }
    50% { opacity: 1; transform: scaleY(1); }
}

/* ============================================
   Section Styles
   ============================================ */

section {
    padding: var(--space-24) 0;
}

.section-header {
    margin-bottom: var(--space-16);
}

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

.section-eyebrow {
    font-size: var(--text-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--color-primary);
    margin-bottom: var(--space-4);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 600;
    color: var(--color-slate);
    line-height: 1.2;
}

.section-footer {
    margin-top: var(--space-12);
    text-align: center;
}

/* ============================================
   Work Section
   ============================================ */

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

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

@media (min-width: 768px) {
    .work-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.work-item {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    aspect-ratio: 4/3;
    cursor: pointer;
}

.work-item--featured {
    aspect-ratio: 16/9;
}

@media (min-width: 768px) {
    .work-item--featured {
        grid-column: span 2;
    }
}

.work-item--wide {
    aspect-ratio: 21/9;
}

@media (min-width: 768px) {
    .work-item--wide {
        grid-column: span 2;
    }
}

.work-image {
    position: relative;
    width: 100%;
    height: 100%;
}

.work-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--color-cream-dark), var(--color-cream));
    transition: transform var(--transition-slow);
}

.work-placeholder--1 {
    background: linear-gradient(135deg, #E8D5C4, #D4A574);
}

.work-placeholder--2 {
    background: linear-gradient(135deg, #C4A77D, #8B7355);
}

.work-placeholder--3 {
    background: linear-gradient(135deg, #A8B5A0, #6B7B6B);
}

.work-placeholder--4 {
    background: linear-gradient(135deg, #2F3640, #4A5568);
}

.work-item:hover .work-placeholder {
    transform: scale(1.05);
}

.work-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(47, 54, 64, 0.9), transparent);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: var(--space-6);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.work-item:hover .work-overlay {
    opacity: 1;
}

.work-category {
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-primary-light);
    margin-bottom: var(--space-2);
}

.work-title {
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-weight: 600;
    color: var(--color-white);
}

.link-arrow {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-weight: 600;
    color: var(--color-primary);
    transition: gap var(--transition-fast);
}

.link-arrow:hover {
    gap: var(--space-3);
}

.arrow {
    transition: transform var(--transition-fast);
}

.link-arrow:hover .arrow {
    transform: translateX(4px);
}

/* ============================================
   Services Section
   ============================================ */

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

@media (min-width: 640px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.service-card {
    background: var(--color-white);
    padding: var(--space-8);
    border-radius: var(--radius-lg);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.service-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.service-icon {
    width: 48px;
    height: 48px;
    color: var(--color-primary);
    margin-bottom: var(--space-6);
}

.service-icon svg {
    width: 100%;
    height: 100%;
}

.service-title {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--color-slate);
    margin-bottom: var(--space-3);
}

.service-description {
    font-size: var(--text-sm);
    color: var(--color-slate-light);
    line-height: 1.6;
}

/* ============================================
   About Section
   ============================================ */

.about {
    background: var(--color-slate);
    color: var(--color-cream);
}

.about .section-eyebrow {
    color: var(--color-primary-light);
}

.about .section-title {
    color: var(--color-cream);
}

.about-grid {
    display: grid;
    gap: var(--space-12);
    align-items: center;
}

@media (min-width: 1024px) {
    .about-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-20);
    }
}

.about-text {
    font-size: var(--text-lg);
    color: rgba(245, 240, 235, 0.8);
    line-height: 1.7;
    margin-bottom: var(--space-6);
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
    margin-top: var(--space-10);
    padding-top: var(--space-10);
    border-top: 1px solid rgba(245, 240, 235, 0.2);
}

.stat {
    text-align: center;
}

@media (min-width: 640px) {
    .stat {
        text-align: left;
    }
}

.stat-number {
    display: block;
    font-family: var(--font-display);
    font-size: var(--text-4xl);
    font-weight: 600;
    color: var(--color-primary-light);
    margin-bottom: var(--space-2);
}

.stat-label {
    font-size: var(--text-sm);
    color: rgba(245, 240, 235, 0.6);
}

.about-visual {
    position: relative;
}

.about-image {
    position: relative;
    aspect-ratio: 4/5;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.about-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--color-slate-light), var(--color-slate));
}

.about-accent {
    position: absolute;
    bottom: -20px;
    right: -20px;
    width: 150px;
    height: 150px;
    background: var(--color-primary);
    border-radius: var(--radius-lg);
    z-index: -1;
}

@media (min-width: 1024px) {
    .about-accent {
        bottom: -40px;
        right: -40px;
        width: 200px;
        height: 200px;
    }
}

/* ============================================
   Testimonials
   ============================================ */

.testimonials {
    background: var(--color-cream);
}

.testimonials-header {
    text-align: center;
    margin-bottom: var(--space-16);
}

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

@media (min-width: 768px) {
    .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .testimonials-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.testimonial {
    background: var(--color-white);
    padding: var(--space-8);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
}

.testimonial-text {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-style: italic;
    color: var(--color-slate);
    line-height: 1.6;
    margin-bottom: var(--space-8);
    flex-grow: 1;
}

.testimonial-text::before {
    content: '"';
    color: var(--color-primary);
    font-size: 2em;
    line-height: 0.5;
    margin-right: 0.1em;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.author-avatar {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
    flex-shrink: 0;
}

.author-info {
    display: flex;
    flex-direction: column;
}

.author-name {
    font-weight: 600;
    color: var(--color-slate);
    font-style: normal;
}

.author-role {
    font-size: var(--text-sm);
    color: var(--color-slate-light);
}

/* ============================================
   Contact Section
   ============================================ */

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

.contact-grid {
    display: grid;
    gap: var(--space-12);
}

@media (min-width: 1024px) {
    .contact-grid {
        grid-template-columns: 1fr 1.2fr;
        gap: var(--space-20);
        align-items: start;
    }
}

.contact-text {
    font-size: var(--text-lg);
    color: var(--color-slate-light);
    line-height: 1.7;
    margin-bottom: var(--space-8);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.contact-link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--text-lg);
    color: var(--color-slate);
    transition: color var(--transition-fast);
}

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

.contact-icon {
    font-size: var(--text-xl);
}

/* Form */
.contact-form {
    background: var(--color-cream);
    padding: var(--space-8);
    border-radius: var(--radius-lg);
}

@media (min-width: 640px) {
    .contact-form {
        padding: var(--space-10);
    }
}

.form-group {
    margin-bottom: var(--space-6);
}

.form-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-slate);
    margin-bottom: var(--space-2);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--space-4);
    background: var(--color-white);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    font-size: var(--text-base);
    color: var(--color-slate);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(184, 115, 51, 0.1);
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--color-slate-light);
    opacity: 0.6;
}

.form-select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%232F3640' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-4) center;
    padding-right: var(--space-10);
}

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

/* ============================================
   Footer
   ============================================ */

.footer {
    background: var(--color-slate);
    color: var(--color-cream);
    padding: var(--space-16) 0 var(--space-8);
}

.footer-grid {
    display: grid;
    gap: var(--space-12);
    margin-bottom: var(--space-12);
}

@media (min-width: 768px) {
    .footer-grid {
        grid-template-columns: 1fr auto;
        align-items: start;
    }
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.footer-logo .logo-mark {
    background: var(--color-primary);
}

.footer-logo .logo-text {
    color: var(--color-cream);
    font-size: var(--text-xl);
}

.footer-tagline {
    color: rgba(245, 240, 235, 0.6);
    max-width: 300px;
}

.footer-links {
    display: flex;
    gap: var(--space-12);
}

.footer-column {
    min-width: 120px;
}

.footer-heading {
    font-size: var(--text-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-cream);
    margin-bottom: var(--space-4);
}

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

.footer-list a {
    color: rgba(245, 240, 235, 0.6);
    transition: color var(--transition-fast);
}

.footer-list a:hover {
    color: var(--color-primary-light);
}

.footer-bottom {
    padding-top: var(--space-8);
    border-top: 1px solid rgba(245, 240, 235, 0.1);
    text-align: center;
}

.footer-copyright {
    font-size: var(--text-sm);
    color: rgba(245, 240, 235, 0.4);
}

/* ============================================
   Utility Classes
   ============================================ */

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