/* ==========================================================================
   DESIGN SYSTEM - NEUTRAL LIGHT/DARK THEME
   ========================================================================== */

/* Define CSS Variables for Theme State */
:root {
    /* Fonts */
    --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'Space Grotesk', monospace;

    /* Light Theme Palette (Neutrals) */
    --bg-primary: #fbfbfb;
    --bg-secondary: #f4f4f5;
    --bg-tertiary: #e4e4e7;
    --card-bg: #ffffff;
    --text-primary: #09090b;
    --text-secondary: #52525b;
    --text-tertiary: #71717a;
    --border-color: #e4e4e7;
    --border-hover: #a1a1aa;
    --accent-color: #09090b;
    --accent-text: #ffffff;
    --accent-glow: rgba(9, 9, 11, 0.05);
    --grid-color: rgba(9, 9, 11, 0.03);
    
    /* Layout & Utilities */
    --transition-speed: 0.3s;
    --transition-curve: cubic-bezier(0.16, 1, 0.3, 1);
    --container-max-width: 1100px;
    --border-radius: 12px;
}

/* Dark Theme Variables */
[data-theme="dark"] {
    --bg-primary: #09090b;
    --bg-secondary: #121214;
    --bg-tertiary: #18181b;
    --card-bg: #131316;
    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --text-tertiary: #71717a;
    --border-color: #222226;
    --border-hover: #3f3f46;
    --accent-color: #fafafa;
    --accent-text: #09090b;
    --accent-glow: rgba(250, 250, 250, 0.1);
    --grid-color: rgba(250, 250, 250, 0.03);
}

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

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

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    transition: background-color var(--transition-speed) var(--transition-curve), 
                color var(--transition-speed) var(--transition-curve);
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
    transition: all 0.2s ease;
}

/* Global Container */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ==========================================================================
   TYPOGRAPHY & BUTTONS
   ========================================================================== */

h1, h2, h3, h4 {
    font-family: var(--font-heading);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.15;
}

p {
    font-family: var(--font-body);
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--accent-color);
    color: var(--accent-text);
    padding: 0.75rem 1.5rem;
    font-family: var(--font-mono);
    font-weight: 500;
    border-radius: var(--border-radius);
    border: 1px solid var(--accent-color);
    cursor: pointer;
    font-size: 0.9rem;
    transition: transform 0.2s var(--transition-curve), background-color 0.2s ease, border-color 0.2s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    opacity: 0.95;
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: transparent;
    color: var(--text-primary);
    padding: 0.75rem 1.5rem;
    font-family: var(--font-mono);
    font-weight: 500;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s var(--transition-curve);
}

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

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

.main-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 70px;
    z-index: 100;
    background-color: rgba(var(--bg-primary), 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    transition: background-color var(--transition-speed) var(--transition-curve),
                border-color var(--transition-speed) var(--transition-curve);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo-text {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.25rem;
    letter-spacing: -0.03em;
}

.accent-dot {
    color: var(--text-primary);
    filter: invert(0.3);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-item {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
}

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

/* Theme Toggle Button */
.theme-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.theme-toggle:hover {
    background-color: var(--bg-secondary);
    border-color: var(--border-hover);
}

.theme-toggle svg {
    width: 18px;
    height: 18px;
    position: absolute;
    transition: transform var(--transition-speed) var(--transition-curve),
                opacity var(--transition-speed) ease;
}

/* Toggle icon visibility */
.sun-icon {
    opacity: 1;
    transform: rotate(0deg);
}

.moon-icon {
    opacity: 0;
    transform: rotate(90deg);
}

[data-theme="dark"] .sun-icon {
    opacity: 0;
    transform: rotate(-90deg);
}

[data-theme="dark"] .moon-icon {
    opacity: 1;
    transform: rotate(0deg);
}

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

.hero {
    position: relative;
    padding-top: 150px;
    padding-bottom: 100px;
    min-height: 80vh;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    overflow: hidden;
}

.hero-container {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    position: relative;
    z-index: 2;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    border: 1px solid var(--border-color);
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    background-color: var(--card-bg);
    margin-bottom: 1.5rem;
}

.pulse-dot {
    width: 6px;
    height: 6px;
    background-color: var(--text-primary);
    border-radius: 50%;
    display: inline-block;
    animation: pulse 1.8s infinite ease-in-out;
}

@keyframes pulse {
    0% { transform: scale(0.9); opacity: 0.6; }
    50% { transform: scale(1.2); opacity: 1; }
    100% { transform: scale(0.9); opacity: 0.6; }
}

.hero-title {
    font-size: 3.5rem;
    line-height: 1.1;
    max-width: 800px;
    margin-bottom: 1.5rem;
}

.hero-title span.text-glow {
    position: relative;
    font-style: italic;
    font-weight: 400;
}

.hero-description {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 620px;
    margin-bottom: 2.5rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
}

/* Grid overlay background */
.bg-grid-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(to right, var(--grid-color) 1px, transparent 1px),
        linear-gradient(to bottom, var(--grid-color) 1px, transparent 1px);
    background-size: 40px 40px;
    z-index: 1;
    pointer-events: none;
    mask-image: radial-gradient(circle at center, black, transparent 80%);
    -webkit-mask-image: radial-gradient(circle at center, black, transparent 80%);
}

/* ==========================================================================
   ABOUT / FEAUTURES SECTION
   ========================================================================== */

.about {
    padding: 100px 0;
    border-bottom: 1px solid var(--border-color);
}

.section-header {
    max-width: 600px;
    margin-bottom: 4rem;
}

.section-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-tertiary);
    display: block;
    margin-bottom: 0.5rem;
}

.section-title {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.section-desc {
    color: var(--text-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.feature-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 2.5rem 2rem;
    border-radius: var(--border-radius);
    transition: all 0.3s var(--transition-curve);
}

.feature-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
}

.feature-icon {
    font-size: 2.25rem;
    margin-bottom: 1.5rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ==========================================================================
   CREATIONS / SHOWCASE SECTION
   ========================================================================== */

.creations {
    padding: 100px 0;
    border-bottom: 1px solid var(--border-color);
}

.projects-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem;
}

.project-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 3rem;
    display: flex;
    flex-direction: column;
    transition: all 0.3s var(--transition-curve);
    position: relative;
    overflow: hidden;
}

.project-card:hover {
    border-color: var(--border-hover);
}

.project-header {
    margin-bottom: 1.5rem;
}

.project-badge {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    border: 1px solid var(--border-color);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    color: var(--text-secondary);
    display: inline-block;
    margin-bottom: 0.75rem;
}

.project-name {
    font-size: 1.75rem;
}

.project-summary {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 2rem;
    flex-grow: 1;
}

.btn-expand-project {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: transparent;
    border: 1px solid var(--border-color);
    padding: 0.75rem 1.25rem;
    border-radius: var(--border-radius);
    color: var(--text-primary);
    cursor: pointer;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.btn-expand-project:hover {
    background-color: var(--bg-secondary);
    border-color: var(--border-hover);
}

.chevron-icon {
    width: 16px;
    height: 16px;
    transition: transform 0.3s var(--transition-curve);
}

/* Expansion panel configuration */
.project-details {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s var(--transition-curve);
}

.project-card.expanded .project-details {
    max-height: 600px; /* high enough limit */
}

.project-card.expanded .chevron-icon {
    transform: rotate(180deg);
}

.details-inner {
    padding-top: 2rem;
    border-top: 1px dashed var(--border-color);
    margin-top: 1.5rem;
}

.details-inner h4 {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
    font-family: var(--font-mono);
}

.details-list {
    list-style: none;
    margin-bottom: 2rem;
}

.details-list li {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    position: relative;
    padding-left: 1.25rem;
}

.details-list li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--text-primary);
    font-weight: bold;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.tech-tag {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    color: var(--text-secondary);
}

.project-links {
    margin-top: 1.5rem;
}

.inline-link {
    gap: 0.5rem;
    width: 100%;
}

.arrow-up-right-icon {
    width: 14px;
    height: 14px;
}

/* ==========================================================================
   TERMINAL SECTION (IDEAS LAB)
   ========================================================================== */

.terminal-section {
    padding: 100px 0;
    border-bottom: 1px solid var(--border-color);
}

.terminal-window {
    background-color: #0c0c0e; /* Fixed dark background for console */
    color: #e4e4e7;
    border-radius: 8px;
    border: 1px solid #27272a;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    font-family: var(--font-mono);
}

.terminal-bar {
    background-color: #16161a;
    padding: 0.75rem 1rem;
    display: flex;
    align-items: center;
    border-bottom: 1px solid #27272a;
}

.terminal-dots {
    display: flex;
    gap: 0.4rem;
    margin-right: 1.5rem;
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
}

.dot.red { background-color: #ef4444; }
.dot.yellow { background-color: #f59e0b; }
.dot.green { background-color: #10b981; }

.terminal-title {
    font-size: 0.75rem;
    color: #a1a1aa;
    text-align: center;
    flex-grow: 1;
    margin-right: 40px; /* balance dot gap */
}

.terminal-body {
    padding: 1.5rem;
    min-height: 280px;
    max-height: 400px;
    overflow-y: auto;
    font-size: 0.85rem;
    line-height: 1.5;
}

.terminal-line {
    margin-bottom: 0.75rem;
    white-space: pre-wrap;
}

.term-prompt {
    color: #38bdf8; /* light blue prompt */
}

.system-resp {
    color: #a1a1aa;
    padding-left: 0.5rem;
    border-left: 2px solid #3f3f46;
}

.cursor {
    display: inline-block;
    width: 8px;
    height: 15px;
    background-color: #fafafa;
    animation: blink 0.8s infinite steps(2);
    vertical-align: middle;
    margin-left: 4px;
}

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

.terminal-controls {
    background-color: #16161a;
    padding: 1rem;
    border-top: 1px solid #27272a;
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.term-btn {
    background-color: #27272a;
    border: 1px solid #3f3f46;
    color: #e4e4e7;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.term-btn:hover {
    background-color: #3f3f46;
    color: #ffffff;
}

/* ==========================================================================
   CONTACT & FOOTER
   ========================================================================== */

.contact {
    padding: 100px 0;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.contact-card {
    max-width: 680px;
    margin: 0 auto;
    text-align: center;
}

.contact-title {
    font-size: 2.25rem;
    margin-bottom: 1.5rem;
}

.contact-desc {
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
}

.contact-info {
    display: flex;
    justify-content: center;
    gap: 3rem;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

.info-icon {
    font-size: 1.25rem;
}

.main-footer {
    padding: 3rem 0;
    font-size: 0.8rem;
    color: var(--text-tertiary);
    border-top: 1px solid var(--border-color);
}

.footer-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-links a:hover {
    color: var(--text-primary);
}

/* ==========================================================================
   RESPONSIVE DESIGN (MEDIA QUERIES)
   ========================================================================== */

@media (max-width: 900px) {
    .hero-title {
        font-size: 2.75rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .projects-container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .project-card {
        padding: 2rem;
    }
}

@media (max-width: 600px) {
    .main-header {
        height: 60px;
    }
    
    .nav-menu {
        display: none; /* Hide full nav on small mobile */
    }
    
    .hero {
        padding-top: 120px;
        padding-bottom: 60px;
    }
    
    .hero-title {
        font-size: 2.25rem;
    }
    
    .hero-actions {
        flex-direction: column;
        width: 100%;
    }
    
    .btn-primary, .btn-secondary {
        width: 100%;
    }
    
    .contact-info {
        flex-direction: column;
        gap: 1.5rem;
        align-items: center;
    }
    
    .footer-container {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}