/* ================================
   CSS VARIABLES & RESET
   ================================ */

:root {
    /* Colors - Refined, architectural palette */
    --color-bg-light: #f8f7f4;
    --color-bg-dark: #2a2a2a;
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #666666;
    --color-accent: #d4af37;
    --color-border: #e0e0e0;
    --color-overlay: rgba(0, 0, 0, 0.85);
    
    /* Theme colors */
    --bg-primary: var(--color-bg-light);
    --bg-secondary: #d8d4cc;
    --bg-card: var(--color-bg-dark);
    --text-main: var(--color-text-primary);
    --text-muted: var(--color-text-secondary);
    --border-color: var(--color-border);
    --nav-bg: rgba(248, 247, 244, 0.95);
    --input-bg: white;
    
    /* Typography */
    --font-display: 'Crimson Pro', serif;
    --font-body: 'DM Sans', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Effects */
    --transition-smooth: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-quick: 0.3s ease;
    --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-lift: 0 8px 40px rgba(0, 0, 0, 0.12);
}

/* Dark mode color overrides */
:root[data-theme="dark"],
:root.theme-dark,
body.theme-dark {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2a2a2a;
    --bg-card: #f8f7f4;
    --text-main: #f8f7f4;
    --text-muted: #b0b0b0;
    --border-color: #3a3a3a;
    --nav-bg: rgba(26, 26, 26, 0.95);
    --input-bg: #2a2a2a;
    --color-overlay: rgba(248, 247, 244, 0.9);
}

/* Explicit body background colors for maximum compatibility */
body.theme-dark {
    background-color: #1a1a1a !important;
    color: #f8f7f4 !important;
}

body.theme-light {
    background-color: #f8f7f4 !important;
    color: #1a1a1a !important;
}

/* Ensure smooth transition for theme changes */
body,
.nav,
section,
.project-card,
.form-group input,
.form-group textarea,
.submit-btn {
    transition: background-color var(--transition-smooth), 
                color var(--transition-smooth), 
                border-color var(--transition-smooth);
}

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

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

body {
    font-family: var(--font-body);
    color: var(--text-main);
    background-color: var(--bg-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color var(--transition-smooth), color var(--transition-smooth);
}

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

/* ================================
   NAVIGATION
   ================================ */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    transition: background var(--transition-smooth), border-color var(--transition-smooth);
}

.nav-logo {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-main);
    text-decoration: none;
    letter-spacing: -0.02em;
    transition: color var(--transition-smooth);
}

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

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9375rem;
    transition: color var(--transition-quick);
}

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

/* Theme Toggle Button */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    background: transparent;
    cursor: pointer;
    transition: all var(--transition-quick);
    margin-left: var(--spacing-sm);
}

.theme-toggle:hover {
    background: var(--border-color);
    transform: rotate(20deg);
}

.theme-toggle svg {
    color: var(--text-main);
    transition: color var(--transition-smooth);
}

.sun-icon {
    display: block;
}

.moon-icon {
    display: none;
}

:root[data-theme="dark"] .sun-icon,
:root.theme-dark .sun-icon {
    display: none;
}

:root[data-theme="dark"] .moon-icon,
:root.theme-dark .moon-icon {
    display: block;
}

/* ================================
   CONTAINER & SECTIONS
   ================================ */

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

section {
    position: relative;
    min-height: 100vh;
    padding: var(--spacing-xl) 0;
    background: var(--bg-primary);
    transition: background-color var(--transition-smooth);
}

/* Section stacking & reveal effect */
section:not(:first-child) {
    margin-top: -5vh;
    box-shadow: 0 -10px 30px rgba(0, 0, 0, 0.1);
}

.projects {
    background: var(--bg-secondary);
    z-index: 2;
}

.contact {
    background: var(--bg-primary);
    z-index: 3;
}

/* ================================
   HERO SECTION
   ================================ */

.hero {
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: calc(60px + var(--spacing-lg));
    z-index: 1;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    font-weight: 600;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.03em;
}

.hero-subtitle {
    display: block;
    color: var(--text-muted);
}

.hero-description {
    max-width: 600px;
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--text-muted);
    margin-bottom: var(--spacing-lg);
}

.tech-icons {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.tech-icon {
    width: 48px;
    height: 48px;
    object-fit: contain;
    opacity: 0.7;
    transition: all var(--transition-quick);
}

.tech-icon:hover {
    opacity: 1;
    transform: translateY(-4px);
}

/* ================================
   PROJECTS SECTION
   ================================ */

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 600;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.02em;
    position: relative;
}

.section-title::before,
.section-title::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 80px;
    height: 1px;
    background: var(--text-main);
}

.section-title::before {
    right: calc(100% + var(--spacing-md));
}

.section-title::after {
    left: calc(100% + var(--spacing-md));
}

.projects-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

/* Project Cards */
.project-card {
    position: relative;
    display: block;
    background: var(--bg-card);
    border-radius: 4px;
    overflow: hidden;
    aspect-ratio: 4 / 3;
    width: 100%;
    min-height: 300px;
    cursor: pointer;
    text-decoration: none;
    transition: transform var(--transition-smooth), background-color var(--transition-smooth);
}

.project-card:hover {
    transform: translateY(-8px);
}

.project-image-wrapper {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    background: var(--bg-card);
    transition: background-color var(--transition-smooth);
}

.project-image {
    max-width: 60%;
    max-height: 60%;
    object-fit: contain;
    opacity: 0.4;
    transition: all var(--transition-smooth);
}

/* Invert filter for dark mode */
:root[data-theme="dark"] .project-image,
:root.theme-dark .project-image {
    filter: brightness(0) invert(0);
}

/* Light mode keeps the invert */
:root[data-theme="light"] .project-image,
:root.theme-light .project-image,
:root:not([data-theme]):not(.theme-dark) .project-image {
    filter: brightness(0) invert(1);
}

.project-card:hover .project-image {
    opacity: 0.15;
    transform: scale(1.1);
}

/* Project Overlay */
.project-overlay {
    position: absolute;
    inset: 0;
    padding: var(--spacing-md);
    background: var(--color-overlay);
    display: flex;
    flex-direction: column;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-smooth);
}

/* Text color changes based on theme */
.project-overlay {
    color: white;
}

:root[data-theme="dark"] .project-overlay,
:root.theme-dark .project-overlay {
    color: var(--color-text-primary);
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.project-name {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.project-description {
    font-size: 0.9375rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
    opacity: 0.9;
}

.project-tech {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.project-tech li {
    font-size: 0.8125rem;
    padding: 0.25rem 0.75rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

/* ================================
   CONTACT SECTION
   ================================ */

.contact {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

.contact .container {
    max-width: 800px;
    width: 100%;
}

.contact-form {
    width: 100%;
    margin-bottom: var(--spacing-lg);
}

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

.form-group label {
    display: block;
    font-size: 0.9375rem;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    color: var(--text-muted);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1.125rem 1.25rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: var(--font-body);
    font-size: 1rem;
    background: var(--input-bg);
    color: var(--text-main);
    transition: border-color var(--transition-quick), background-color var(--transition-smooth), color var(--transition-smooth);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--text-main);
}

.form-group textarea {
    resize: vertical;
    min-height: 180px;
}

.submit-btn {
    width: 100%;
    padding: 1rem;
    background: var(--text-main);
    color: var(--bg-primary);
    border: none;
    border-radius: 4px;
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-quick);
}

.submit-btn:hover {
    background: var(--text-muted);
    transform: translateY(-2px);
}

/* Social Links */
.social-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.social-links a {
    display: block;
    width: 64px;
    height: 64px;
    transition: transform var(--transition-quick);
}

.social-links a:hover {
    transform: translateY(-6px);
}

.social-links img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* ================================
   RESPONSIVE - TABLET
   ================================ */

@media (min-width: 768px) {
    .nav {
        padding: var(--spacing-md) var(--spacing-lg);
    }
    
    .container {
        padding: 0 var(--spacing-lg);
    }
    
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }
    
    .tech-icons {
        gap: var(--spacing-md);
    }
    
    .tech-icon {
        width: 56px;
        height: 56px;
    }
}

/* ================================
   RESPONSIVE - DESKTOP
   ================================ */

@media (min-width: 1024px) {
    section {
        padding: var(--spacing-xl) 0;
    }
    
    .hero {
        padding-top: calc(60px + var(--spacing-xl));
    }
    
    .projects-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-md);
    }
    
    /* Ensure all cards are equal size - remove the offset for last row */
    .project-card {
        width: 100%;
    }
    
    .section-title::before,
    .section-title::after {
        width: 120px;
    }
}

/* ================================
   ANIMATIONS & MICRO-INTERACTIONS
   ================================ */

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

.hero-title,
.hero-description,
.tech-icons {
    animation: fadeInUp 0.8s ease-out backwards;
}

.hero-description {
    animation-delay: 0.2s;
}

.tech-icons {
    animation-delay: 0.4s;
}

/* Smooth scrolling enhancement */
@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }
}