/* ========================================
   DESIGN SYSTEM - CSS VARIABLES
   Modify these to change entire theme
   ======================================== */
:root {
    /* Terminal-inspired Color Scheme */
    --color-primary: #00ff88;
    --color-primary-glow: rgba(0, 255, 136, 0.3);
    --color-secondary: #00d9ff;
    --color-accent: #ff00aa;
    --color-bg: #0a0e1a;
    --color-bg-elevated: #111827;
    --color-bg-card: #1a2332;
    --color-terminal-bg: #0d1117;
    --color-text: #e6edf3;
    --color-text-muted: #7d8590;
    --color-border: #30363d;
    --color-success: #3fb950;
    --color-warning: #d29922;
    --color-error: #f85149;
    
    /* Typography */
    --font-primary: 'Space Grotesk', sans-serif;
    --font-mono: 'IBM Plex Mono', monospace;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    
    /* Borders & Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    
    /* Transitions */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========================================
   BASE STYLES
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px; /* Account for fixed navigation */
}

/* Prevent auto-scroll on page load */
html.loading {
    scroll-behavior: auto !important;
}

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

/* Scanline effect for terminal aesthetic */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        transparent 50%,
        rgba(0, 255, 136, 0.02) 50%
    );
    background-size: 100% 4px;
    pointer-events: none;
    z-index: 9999;
    animation: scanline 8s linear infinite;
}

@keyframes scanline {
    0% { transform: translateY(0); }
    100% { transform: translateY(4px); }
}

#root {
    min-height: 100vh;
}

/* Ensure sections are properly spaced */
section {
    position: relative;
}

section:target {
    scroll-margin-top: 80px;
}

/* ========================================
   NAVIGATION
   ======================================== */
.nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(10, 14, 26, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    padding: var(--spacing-sm) 0;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-primary);
    text-shadow: 0 0 20px var(--color-primary-glow);
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
    list-style: none;
}

.nav-link {
    color: var(--color-text-muted);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all var(--transition-fast);
    position: relative;
    font-family: var(--font-mono);
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-primary);
    box-shadow: 0 0 10px var(--color-primary-glow);
}

/* ========================================
   HERO SECTION
   ======================================== */
.hero {
    min-height: 100svh;   /* mobile-safe viewport */
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding-top: 80px;    
}

/* Animated grid background */
.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(var(--color-border) 1px, transparent 1px),
        linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
    background-size: 50px 50px;
    opacity: 0.1;
    animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
    0% { transform: translateY(0); }
    100% { transform: translateY(50px); }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
    padding: 0 var(--spacing-md);
}

.hero-prefix {
    font-family: var(--font-mono);
    color: var(--color-secondary);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
    animation: fadeInUp 0.6s ease;
}

.hero-prefix::before {
    content: '> ';
    color: var(--color-primary);
}

.hero-title {
    font-size: 4.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 0.8s ease;
}

.hero-subtitle {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 1s ease;
}

.hero-description {
    color: var(--color-text-muted);
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 1.2s ease;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 1.4s ease;
}

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

/* ========================================
   BUTTONS
   ======================================== */
.btn {
    padding: 0.875rem 2rem;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    font-family: var(--font-mono);
    transition: all var(--transition-normal);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    border: 2px solid transparent;
    font-size: 0.95rem;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-bg);
    border-color: var(--color-primary);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

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

.btn-primary:hover {
    box-shadow: 0 0 30px var(--color-primary-glow);
    transform: translateY(-2px);
}

.btn-outline {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: transparent;
}

.btn-outline:hover {
    background: var(--color-primary);
    color: var(--color-bg);
    box-shadow: 0 0 30px var(--color-primary-glow);
}

.contact-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--spacing-lg);
}

/* ========================================
   SECTION CONTAINER
   ======================================== */
.section {
    padding: var(--spacing-xl) var(--spacing-md);
    max-width: 1400px;
    margin: 0 auto;
}

.section-header {
    margin-bottom: var(--spacing-lg);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    font-family: var(--font-mono);
    color: var(--color-text);
}

.section-title span {
    color: var(--color-primary);
}

.section-description {
    color: var(--color-text-muted);
    font-size: 1.1rem;
}

/* ========================================
   INTERACTIVE PROJECT VIEWER
   Main feature - showcase running projects
   ======================================== */
.project-viewer {
    background: var(--color-bg-elevated);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
}

.project-tabs {
    display: flex;
    background: var(--color-bg-card);
    border-bottom: 1px solid var(--color-border);
    overflow-x: auto;
}

.project-tab {
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--color-text-muted);
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.project-tab:hover {
    color: var(--color-text);
    background: rgba(0, 255, 136, 0.05);
}

.project-tab.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
    background: rgba(0, 255, 136, 0.1);
}

.project-content {
    min-height: 700px;
    position: relative;
}

.project-panel {
    display: none;
    animation: fadeIn 0.3s ease;
}

.project-panel.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* ========================================
   TERMINAL EMULATOR
   Interactive terminal for running code
   ======================================== */
.terminal {
    background: var(--color-terminal-bg);
    border-radius: var(--radius-md);
    overflow: hidden;
    font-family: var(--font-mono);
    margin: var(--spacing-md);
}

.terminal-header {
    background: var(--color-bg-card);
    padding: var(--spacing-xs) var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border-bottom: 1px solid var(--color-border);
}

.terminal-button {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.terminal-button.close { background: #ff5f56; }
.terminal-button.minimize { background: #ffbd2e; }
.terminal-button.maximize { background: #27c93f; }

.terminal-title {
    margin-left: auto;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.terminal-body {
    padding: var(--spacing-md);
    max-height: 400px;
    overflow-y: auto;
    font-size: 0.9rem;
}

.terminal-line {
    margin-bottom: 0.5rem;
    display: flex;
    flex-wrap: wrap;
}

.terminal-prompt {
    color: var(--color-primary);
    margin-right: 0.5rem;
}

.terminal-command {
    color: var(--color-secondary);
}

.terminal-output {
    color: var(--color-text-muted);
    white-space: pre-wrap;
    margin-left: 0;
    width: 100%;
}

.terminal-error {
    color: var(--color-error);
}

.terminal-success {
    color: var(--color-success);
}

.terminal-input-line {
    display: flex;
    align-items: center;
}

.terminal-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--color-text);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    outline: none;
    padding: 0;
}

.cursor {
    display: inline-block;
    width: 8px;
    height: 16px;
    background: var(--color-primary);
    margin-left: 2px;
    animation: blink 1s infinite;
}

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

/* ========================================
   IFRAME PROJECT VIEWER
   For displaying live projects
   ======================================== */
.iframe-container {
    background: var(--color-terminal-bg);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin: var(--spacing-md);
    border: 1px solid var(--color-border);
}

.iframe-header {
    background: var(--color-bg-card);
    padding: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    border-bottom: 1px solid var(--color-border);
}

.iframe-url {
    flex: 1;
    background: var(--color-terminal-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.iframe-wrapper {
    width: 100%;
    height: 700px;
    border: none;
    background: transparent;
}

/* Ensure iframe content displays properly */
.iframe-container iframe {
    display: block;
}

/* Remove any potential white space around iframe */
.iframe-container {
    line-height: 0;
}

/* ========================================
   CODE EDITOR VIEW
   Display source code with syntax highlighting
   ======================================== */
.code-viewer {
    background: var(--color-terminal-bg);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin: var(--spacing-md);
    border: 1px solid var(--color-border);
}

.code-header {
    background: var(--color-bg-card);
    padding: var(--spacing-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--color-border);
}

.code-filename {
    font-family: var(--font-mono);
    color: var(--color-text);
    font-size: 0.9rem;
}

.code-copy-btn {
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.code-copy-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.code-content {
    padding: var(--spacing-md);
    overflow-x: auto;
    max-height: 500px;
    overflow-y: auto;
}

.code-content pre {
    margin: 0;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.6;
}

.code-content code {
    color: var(--color-text);
}

/* Basic syntax highlighting */
.keyword { color: #ff79c6; }
.string { color: #f1fa8c; }
.comment { color: #6272a4; }
.function { color: #50fa7b; }
.number { color: #bd93f9; }

/* ========================================
   PROJECT DESCRIPTION
   ======================================== */
.project-description {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-bg-card);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.project-description h3 {
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.project-description p {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.tag {
    background: rgba(0, 255, 136, 0.1);
    border: 1px solid var(--color-primary);
    color: var(--color-primary);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-family: var(--font-mono);
}

/* ========================================
   SKILLS SECTION
   ======================================== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.skill-category {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    transition: all var(--transition-normal);
}

.skill-category:hover {
    border-color: var(--color-primary);
    box-shadow: 0 10px 30px rgba(0, 255, 136, 0.1);
}

.skill-category h3 {
    font-family: var(--font-mono);
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.skill-list {
    list-style: none;
}

.skill-item {
    padding: var(--spacing-xs) 0;
    color: var(--color-text-muted);
    position: relative;
    padding-left: 1.5rem;
}

.skill-item::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--color-primary);
}

/* ========================================
   UTILITY CLASSES
   ======================================== */
.text-center {
    text-align: center;
}

.hidden {
    display: none;
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .project-tabs {
        flex-wrap: nowrap;
    }
    
    .terminal-body {
        font-size: 0.8rem;
    }
    
    .nav-links {
        display: none;
    }
    
    /* Responsive iframe adjustments */
    .iframe-wrapper {
        height: 600px;
    }
    
    .project-content {
        min-height: 600px;
    }
    
    .iframe-container {
        margin: var(--spacing-sm);
    }
    
    .hero {
        min-height: auto;
        height: auto;
        padding-top: 100px;
        padding-bottom: 60px;
    }
}