/* Swiss International Style - Portfolio Theme */
:root {
    --color-primary: #D42A00; /* Darker Swiss Red for Accessibility */
    --color-black: #000000;
    --color-white: #FFFFFF;
    --color-grey: #F0F0F0;
    --font-main: 'Helvetica Neue', helvetica, arial, sans-serif;
    --grid-gap: 20px;
    --transition-speed: 0.4s;
    --base-line-height: 1.5;
    --scale-ratio: 1.25; /* Major Third Scale */
}

html {
    scroll-behavior: smooth;
    font-size: 100%; /* Base 16px */
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-main);
    background-color: var(--color-white);
    color: var(--color-black);
    line-height: var(--base-line-height);

    /* Fluid Typography: 16px at 320px -> 20px at 1400px */
    font-size: clamp(1rem, 0.92rem + 0.39vw, 1.25rem); 
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Skip to content for accessibility */
.skip-to-content {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: var(--color-white);
    padding: 8px 16px;
    text-decoration: none;
    z-index: 10000;
}

.skip-to-content:focus {
    top: 0;
}

/* Grid System */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 clamp(20px, 5vw, 40px);
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--grid-gap);
}

/* Typography Hierarchy */
h1, h2, h3, h4 {
    font-weight: 700;
    letter-spacing: -0.03em;
    text-transform: uppercase;
    line-height: 1.1;
    margin-bottom: 0.5em;
}

h1 {
    /* Optimized Fluid Type: 40px -> 96px */
    font-size: clamp(2.5rem, 1.5rem + 4vw, 6rem); 
    grid-column: 1 / -1;
    margin-bottom: 0.8em;
    opacity: 0;
    animation: slide-up 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

h2 {
    /* Optimized: 28px -> 48px */
    font-size: clamp(1.75rem, 1.2rem + 2vw, 3rem);
    margin-bottom: 0.6em;
}

h3 {
    font-size: 1.5rem;
}

p {
    margin-bottom: 1rem;
    max-width: 65ch; /* Optimal reading length */
    font-weight: 400;
    color: #000000; /* Pure black for maximum contrast */
}

/* Accessibility: Ensure sufficient contrast for text on images */
.hero-text p {
    color: #000000;
}

a {
    color: var(--color-black);
    text-decoration: none;
    position: relative;
    transition: color var(--transition-speed);
}

/* Cool Link Hover Effect */
a:not(.btn)::after {
    content: '';
    position: absolute;
    width: 100%;
    transform: scaleX(0);
    height: 2px;
    bottom: -2px;
    left: 0;
    background-color: var(--color-primary);
    transform-origin: bottom right;
    transition: transform 0.25s ease-out;
}

a:not(.btn):hover::after {
    transform: scaleX(1);
    transform-origin: bottom left;
}

a:hover {
    color: var(--color-primary);
}

/* Header */
header {
    padding: clamp(20px, 3vw, 30px) 0;
    border-bottom: 4px solid var(--color-black);
    margin-bottom: clamp(30px, 5vw, 50px);
    position: sticky;
    top: 0;
    background: rgb(255 255 255 / 98%);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: 0 2px 16px rgb(0 0 0 / 4%);
}

nav {
    grid-column: 1 / -1;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-weight: 900;
    font-size: 1.5rem;
    border-bottom: none;
    letter-spacing: -1px;
}

.nav-links a {
    margin-left: 30px;
    font-weight: 700;
    border-bottom: none;
    font-size: 0.9rem;
    text-transform: uppercase;
}

.nav-links a:hover {
    color: var(--color-primary);
    background: none;
}

/* Sections */
section {
    grid-column: 1 / -1;
    margin-bottom: clamp(60px, 10vw, 100px); /* Responsive vertical spacing */
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--grid-gap);
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

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

.hero-section {
    display: contents;
    min-height: clamp(500px, 70vh, 700px);
}

.hero-text {
    grid-column: 1 / 7;
    z-index: 2;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding-right: 40px;
}

.hero-image {
    grid-column: 7 / -1;
    height: clamp(500px, 70vh, 700px);
    background-color: var(--color-grey);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    border-radius: 2px;
    border: 1px solid rgb(0 0 0 / 8%);
    box-shadow: 0 8px 24px rgb(0 0 0 / 8%);
}

.hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center top;
    transition: transform 1.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.hero-image:hover img {
    transform: scale(1.05);
}

/* Services / Persuasion Elements */
.service-card {
    grid-column: span 4;
    border-top: 3px solid var(--color-black);
    padding: 20px;
    background: rgb(240 240 240 / 40%);
    border-radius: 4px;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    box-shadow: 0 2px 8px rgb(0 0 0 / 4%);
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.service-card:hover {
    transform: translateY(-10px);
    padding-left: 10px;
}

.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    transition: color 0.3s;
}

.service-card:hover h3 {
    color: var(--color-primary);
}

/* CTA Section */
.cta-section {
    background-color: var(--color-black);
    color: var(--color-white);
    padding: clamp(50px, 8vw, 80px) 20px;
    grid-column: 1 / -1;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.cta-section h2 {
    color: var(--color-white);
}

.btn {
    display: inline-block;
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: 18px 36px;
    font-weight: 700;
    cursor: pointer;
    margin-top: 24px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 0.95rem;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    border: 2px solid var(--color-primary);
    border-radius: 2px;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 12px rgb(212 42 0 / 25%);
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgb(255 255 255 / 20%);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn:hover {
    background-color: transparent;
    color: var(--color-primary);
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgb(212 42 0 / 30%);
}

.btn:focus {
    outline: 3px solid var(--color-primary);
    outline-offset: 4px;
}

.btn:active {
    transform: translateY(-1px);
}

/* Footer */
footer {
    padding: 40px 0;
    border-top: 1px solid #cccccc;
    margin-top: 60px;
}

.footer-content {
    grid-column: 1 / -1;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 20px;
}

/* Animations */
@keyframes slide-up {
    from {
        opacity: 0;
        transform: translateY(50px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive */
@media (width <= 1024px) {
    .hero-section {
        display: block;
    }

    .hero-text {
        grid-column: 1 / -1;
        padding-right: 0;
        margin-bottom: 40px;
    }

    .hero-image {
        grid-column: 1 / -1;
        height: 400px;
    }
}

@media (width <= 768px) {
    .container {
        display: flex;
        flex-direction: column;
    }
    
    .service-card {
        width: 100%;
        margin-bottom: 30px;
    }
    
    .nav-links {
        display: none; /* In a real project, implement a hamburger menu */
    }
    
    /* Mobile Menu Placeholder */
    nav::after {
        content: '☰';
        font-size: 1.5rem;
        cursor: pointer;
    }
}

/* Project Grid Utilities */
.project-image {
    grid-column: 1 / 7;
}

.project-info {
    grid-column: 7 / -1;
}

@media (width <= 768px) {
    .project-image, .project-info {
        grid-column: 1 / -1;
        width: 100%;
    }
    
    .project-image {
        margin-bottom: 20px;
    }
}

/* About & Contact Grid Utilities */
.col-left {
    grid-column: 1 / 6;
}

.col-right {
    grid-column: 6 / -1;
}

@media (width <= 768px) {
    .col-left, .col-right {
        grid-column: 1 / -1;
    }
    
    .col-left {
        margin-bottom: 20px;
    }
}

/* Form Styles */
.contact-form {
    display: grid;
    gap: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 15px;
    border: 2px solid rgb(0 0 0 / 20%);
    font-family: var(--font-main);
    font-size: 1rem;
    background: rgb(250 250 250 / 50%);
    border-radius: 2px;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    background: var(--color-white);
    box-shadow: 0 0 0 3px rgb(212 42 0 / 10%), 0 4px 12px rgb(0 0 0 / 6%);
    transform: translateY(-2px);
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.checkbox-group label {
    font-size: 0.9rem;
    cursor: pointer;
}