/* ===== ADRIAN ZUMBRUNNEN-INSPIRED PORTFOLIO CSS ===== */

/* CSS Variables - Minimal Black, Gray, White Palette */
:root {
    /* Colors */
    --color-black: #1a1a1a;
    --color-gray-dark: #4a4a4a;
    --color-gray-medium: #888888;
    --color-gray-light: #cccccc;
    --color-gray-subtle: #f5f5f5;
    --color-white: #ffffff;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, system-ui, sans-serif;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-bold: 600;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2.5rem;
    --spacing-xl: 3.5rem;
    
    /* Transitions */
    --transition: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    color: var(--color-black);
    background-color: var(--color-white);
    line-height: 1.6;
    margin: 0;
    padding: 0;
}

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

/* Typography */
h1, h2, h3 {
    font-weight: var(--font-weight-bold);
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: 3rem;
}

h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    text-align: center;
    letter-spacing: -0.02em;
    font-weight: var(--font-weight-bold);
}

h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

p {
    margin-bottom: var(--spacing-sm);
    color: var(--color-gray-dark);
}

/* Links */
a {
    color: var(--color-black);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--color-gray-medium);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-lg) var(--spacing-md);
}

.greeting-container {
    max-width: 800px;
    margin: 0 auto;
}

/* Hero Greeting Animation */
.hero-greeting {
    font-size: 3rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-black);
    margin-bottom: var(--spacing-sm);
    min-height: 4rem; /* Prevent layout shift */
    letter-spacing: -0.03em;
}

.hero-greeting::after {
    content: '|';
    color: var(--color-gray-medium);
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

.hero-name {
    font-size: 2rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-black);
    margin-bottom: var(--spacing-md);
    text-transform: none; /* Ensure proper capitalization */
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-gray-dark);
    margin-bottom: var(--spacing-sm);
    line-height: 1.6;
    font-weight: var(--font-weight-medium);
}

.hero-context {
    font-size: 1rem;
    color: var(--color-gray-medium);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
    font-weight: var(--font-weight-normal);
}

.hero-description {
    font-size: 1.125rem;
    color: var(--color-gray-dark);
    line-height: 1.7;
    margin-bottom: var(--spacing-sm);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-focus {
    font-size: 1rem;
    color: var(--color-gray-medium);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

/* Chat Interface */
.chat-interface {
    background: var(--color-gray-subtle);
    border-radius: 12px;
    padding: var(--spacing-md);
    margin-top: var(--spacing-lg);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--color-gray-light);
}

.chat-label {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
    /* Visually hidden but accessible to screen readers */
}

.chat-input {
    width: 100%;
    border: 2px solid var(--color-gray-light);
    border-radius: 8px;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1rem;
    background: var(--color-white);
    transition: all var(--transition);
    margin-bottom: var(--spacing-md);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.chat-input:focus {
    outline: none;
    border-color: var(--color-black);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transform: translateY(-1px);
}

.chat-input:focus-visible {
    outline: 2px solid var(--color-black);
    outline-offset: 2px;
}

.suggested-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    justify-content: center;
}

.chat-btn {
    background: var(--color-black);
    color: var(--color-white);
    border: none;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.chat-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

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

.chat-btn:hover {
    background: var(--color-gray-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.chat-btn:active {
    transform: translateY(0);
}

.chat-btn:focus {
    outline: 2px solid var(--color-black);
    outline-offset: 2px;
}

.chat-response {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--color-white);
    border-radius: 8px;
    border-left: 4px solid var(--color-black);
    display: none;
    min-height: 50px;
    line-height: 1.6;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.chat-response.show {
    display: block;
    animation: fadeIn 0.3s ease;
}

.chat-response.show.typing::after {
    content: '▋';
    animation: blink 1s infinite;
    color: var(--color-black);
    margin-left: 2px;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

/* Sections */
.section {
    padding: var(--spacing-lg) 0;
    position: relative;
}

.section:not(:first-of-type)::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 1px;
    background: var(--color-gray-light);
}

.section:first-of-type {
    padding-top: var(--spacing-lg);
}

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

/* About Section */
.conversation-block {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.conversation-block h2 {
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.conversation-block p {
    text-align: left;
    font-size: 1.125rem;
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.current-focus {
    text-align: left;
    margin: var(--spacing-md) 0;
}

.current-focus h3 {
    color: var(--color-black);
    margin-bottom: var(--spacing-sm);
}

.focus-list {
    list-style: none;
    padding: 0;
    text-align: left;
    max-width: 100%;
}

.focus-list li {
    padding: var(--spacing-sm) 0;
    color: var(--color-gray-dark);
    position: relative;
    padding-left: var(--spacing-md);
    line-height: 1.6;
}

.focus-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-black);
    font-weight: var(--font-weight-bold);
}

.expertise-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-top: var(--spacing-md);
}

.tag {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-gray-subtle);
    color: var(--color-black);
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    border: 1px solid var(--color-gray-light);
}

/* Projects Section */
.projects-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.project-card {
    background: var(--color-white);
    border: 1px solid var(--color-gray-light);
    border-radius: 12px;
    padding: var(--spacing-md);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: transform;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    opacity: 0;
    transform: translateY(20px);
}

.project-card.visible {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12);
    border-color: var(--color-black);
}

.project-card:focus-within {
    outline: 2px solid var(--color-black);
    outline-offset: 4px;
}

.project-card h3 {
    color: var(--color-black);
    margin-bottom: var(--spacing-sm);
    line-height: 1.3;
    font-size: 1.35rem;
    letter-spacing: -0.01em;
    word-break: keep-all;
    hyphens: none;
}

.project-problem {
    color: var(--color-gray-dark);
    margin-bottom: var(--spacing-sm);
    line-height: 1.6;
}

.project-description {
    color: var(--color-gray-dark);
    margin-bottom: var(--spacing-sm);
    line-height: 1.7;
    font-size: 1rem;
}

.project-impact {
    color: var(--color-gray-dark);
    margin-bottom: var(--spacing-sm);
    line-height: 1.6;
}

.project-meta {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
    padding-top: var(--spacing-xs);
    border-top: 1px solid var(--color-gray-subtle);
}

.tech {
    font-size: 0.875rem;
    color: var(--color-gray-dark);
    font-weight: var(--font-weight-medium);
    line-height: 1.5;
}

.publication {
    font-size: 0.875rem;
    color: var(--color-black);
    font-weight: var(--font-weight-bold);
}

.project-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.btn-link {
    color: var(--color-black);
    font-weight: var(--font-weight-medium);
    padding: var(--spacing-xs) 0;
    border-bottom: 1px solid transparent;
    transition: all var(--transition);
    text-decoration: none;
    display: inline-block;
    position: relative;
}

.btn-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-black);
    transition: width 0.3s ease;
}

.btn-link:hover {
    opacity: 0.8;
    transform: translateX(2px);
}

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

.btn-link:focus {
    outline: 2px solid var(--color-black);
    outline-offset: 4px;
    border-radius: 2px;
}

/* Publications Section */
.publications-list {
    max-width: 600px;
    margin: 0 auto;
}

.publication-item {
    background: var(--color-white);
    border: 1px solid var(--color-gray-light);
    border-radius: 12px;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    opacity: 0;
    transform: translateY(20px);
}

.publication-item.visible {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.publication-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
    border-color: var(--color-black);
}

.publication-item:focus-within {
    outline: 2px solid var(--color-black);
    outline-offset: 4px;
}

.publication-item h3 {
    color: var(--color-black);
    margin-bottom: var(--spacing-sm);
    line-height: 1.3;
    font-size: 1.35rem;
    letter-spacing: -0.01em;
    word-break: keep-all;
    hyphens: none;
}

.pub-venue {
    font-size: 0.875rem;
    color: var(--color-gray-medium);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--spacing-xs);
}

.pub-description {
    color: var(--color-gray-dark);
    margin-bottom: var(--spacing-sm);
    line-height: 1.6;
}

.pub-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

/* Contact Section */
.contact-intro {
    text-align: center;
    font-size: 1.125rem;
    color: var(--color-gray-medium);
    margin-bottom: var(--spacing-sm);
}

.contact-cta {
    text-align: center;
    font-size: 1rem;
    color: var(--color-gray-dark);
    margin-bottom: var(--spacing-md);
}

.contact-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

.contact-item {
    display: flex;
    flex-direction: column;
    padding: var(--spacing-md);
    background: var(--color-gray-subtle);
    border-radius: 12px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: center;
    border: 1px solid transparent;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.contact-item:focus {
    outline: 2px solid var(--color-black);
    outline-offset: 4px;
}

.contact-item:hover {
    background: var(--color-white);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12);
    border-color: var(--color-gray-light);
}

.contact-item:focus {
    outline: 2px solid var(--color-black);
    outline-offset: 2px;
}

.contact-label {
    font-size: 0.875rem;
    color: var(--color-gray-medium);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--spacing-xs);
}

.contact-value {
    font-size: 1rem;
    color: var(--color-black);
    font-weight: var(--font-weight-medium);
}

.availability {
    text-align: center;
    font-size: 1rem;
    color: var(--color-gray-dark);
    font-weight: var(--font-weight-medium);
}

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

.footer p {
    color: var(--color-white);
    margin: 0;
}

/* iOS Safe Area Support - Prevents content from being obscured by notches */
@supports (padding: max(0px)) {
    .container {
        padding-left: max(var(--spacing-md), env(safe-area-inset-left));
        padding-right: max(var(--spacing-md), env(safe-area-inset-right));
    }
    
    .hero {
        padding-top: max(var(--spacing-lg), env(safe-area-inset-top));
        padding-bottom: max(0px, env(safe-area-inset-bottom));
    }
    
    .section {
        padding-left: max(0px, env(safe-area-inset-left));
        padding-right: max(0px, env(safe-area-inset-right));
        padding-bottom: max(0px, env(safe-area-inset-bottom));
    }
    
    .chat-interface {
        margin-bottom: max(0px, env(safe-area-inset-bottom));
    }
    
    .footer {
        padding-bottom: max(var(--spacing-md), env(safe-area-inset-bottom));
        padding-left: max(var(--spacing-md), env(safe-area-inset-left));
        padding-right: max(var(--spacing-md), env(safe-area-inset-right));
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-greeting {
        font-size: 2rem;
    }
    
    .hero-name {
        font-size: 1.5rem;
    }
    
    h2 {
        font-size: 2rem;
    }
    
    .suggested-actions {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .chat-btn {
        width: 100%;
        padding: var(--spacing-sm) var(--spacing-md);
        min-height: 44px; /* Better touch target */
        font-size: 1rem;
    }
    
    .conversation-block p,
    .current-focus {
        text-align: center;
    }
    
    .focus-list {
        text-align: left;
        max-width: 400px;
        margin: 0 auto;
    }
    
    .projects-grid,
    .publications-list,
    .contact-grid {
        max-width: 100%;
        padding: 0 var(--spacing-sm);
        gap: var(--spacing-md);
    }
    
    .project-card,
    .publication-item {
        padding: var(--spacing-md);
    }
    
    .project-description,
    .pub-description {
        font-size: 0.95rem;
        line-height: 1.6;
    }
    
    .project-card h3,
    .publication-item h3 {
        font-size: 1.2rem;
        letter-spacing: -0.02em;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero-greeting {
        font-size: 1.75rem;
        min-height: 3rem;
    }
    
    .hero-name {
        font-size: 1.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .hero-context {
        font-size: 0.95rem;
    }
    
    h2 {
        font-size: 1.75rem;
    }
    
    .hero {
        padding: var(--spacing-md) 0;
    }
    
    .section {
        padding: var(--spacing-md) 0;
    }
    
    .hero {
        padding: var(--spacing-md) 0 var(--spacing-lg);
    }
    
    .chat-interface {
        padding: var(--spacing-sm);
        margin-top: var(--spacing-md);
    }
    
    .chat-input {
        padding: var(--spacing-md);
        font-size: 16px; /* Prevents zoom on iOS */
        min-height: 44px; /* Better touch target */
    }
    
    .project-card,
    .publication-item {
        padding: var(--spacing-md);
    }
    
    .project-card h3,
    .publication-item h3 {
        font-size: 1.15rem;
        letter-spacing: -0.02em;
        line-height: 1.4;
    }
    
    .btn-link {
        padding: var(--spacing-sm) 0;
        min-height: 44px;
        display: inline-flex;
        align-items: center;
    }
    
    .contact-item {
        padding: var(--spacing-md);
        min-height: 60px;
    }
    
    .contact-label {
        font-size: 0.8rem;
    }
    
    .contact-value {
        font-size: 0.95rem;
    }
    
    .section-intro,
    .contact-intro {
        font-size: 1rem;
        padding: 0 var(--spacing-sm);
    }
}

/* Performance Optimizations */
.project-card,
.publication-item,
.contact-item {
    will-change: transform;
}

/* Smooth animations */
* {
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}