/* ==========================================================================
   DESIGN SYSTEM & VARIABLES
   ========================================================================== */
:root {
    /* Color Palette - Dark (Default) */
    --bg-primary-h: 222;
    --bg-primary-s: 47%;
    --bg-primary-l: 7%;
    --bg-primary: hsl(var(--bg-primary-h), var(--bg-primary-s), var(--bg-primary-l));
    
    --bg-secondary: hsl(222, 40%, 12%);
    --text-primary: hsl(210, 40%, 98%);
    --text-secondary: hsl(215, 20%, 70%);
    --text-muted: hsl(215, 15%, 50%);
    
    --accent-h: 199;
    --accent-s: 89%;
    --accent-l: 48%;
    --accent: hsl(var(--accent-h), var(--accent-s), var(--accent-l));
    --accent-glow: hsla(var(--accent-h), var(--accent-s), var(--accent-l), 0.15);
    
    --border-color: hsl(222, 30%, 18%);
    
    /* Glassmorphism */
    --glass-bg: rgba(15, 23, 42, 0.6);
    --glass-border: rgba(255, 255, 255, 0.08);
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-display: 'Outfit', var(--font-sans);
    --font-mono: 'Fira Code', 'Courier New', Courier, monospace;
    
    /* Miscellaneous */
    --nav-bg: rgba(11, 15, 25, 0.8);
    --card-shadow: 0 10px 30px -10px rgba(2, 6, 23, 0.5);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme Variables Override */
[data-theme="light"] {
    --bg-primary-h: 210;
    --bg-primary-s: 40%;
    --bg-primary-l: 98%;
    --bg-primary: hsl(var(--bg-primary-h), var(--bg-primary-s), var(--bg-primary-l));
    
    --bg-secondary: hsl(0, 0%, 100%);
    --text-primary: hsl(222, 47%, 12%);
    --text-secondary: hsl(215, 16%, 35%);
    --text-muted: hsl(215, 16%, 50%);
    
    --accent-h: 221;
    --accent-s: 83%;
    --accent-l: 53%;
    --accent: hsl(var(--accent-h), var(--accent-s), var(--accent-l));
    --accent-glow: hsla(var(--accent-h), var(--accent-s), var(--accent-l), 0.1);
    
    --border-color: hsl(214, 32%, 91%);
    
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(0, 0, 0, 0.06);
    
    --nav-bg: rgba(248, 250, 252, 0.8);
    --card-shadow: 0 10px 30px -10px rgba(148, 163, 184, 0.2);
}

/* ==========================================================================
   RESET & BASE STYLES
   ========================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.4s ease, color 0.4s ease, border-color 0.4s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    padding-top: 80px;
    overflow-x: hidden;
}

h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 700;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: var(--transition-smooth);
}

/* Custom Scrollbars */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--accent);
}

/* ==========================================================================
   LAYOUT COMPONENTS
   ========================================================================== */
section {
    padding: 6rem 2rem;
    max-width: 1100px;
    margin: 0 auto;
}

h2 {
    font-size: 2.2rem;
    margin-bottom: 3rem;
    position: relative;
    display: inline-block;
    padding-bottom: 0.5rem;
}

h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 4px;
    background: var(--accent);
    border-radius: 2px;
}

/* Navigation */
nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--nav-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 3rem;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    font-weight: 800;
    font-size: 1.3rem;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.logo span {
    color: var(--accent);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2.5rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: var(--transition-smooth);
}

.nav-links a:hover::after {
    width: 100%;
}

/* Theme Toggle */
.theme-toggle {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 30px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    box-shadow: var(--card-shadow);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition-smooth);
}

.theme-toggle:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
#hero {
    min-height: calc(90vh - 80px);
    display: flex;
    align-items: center;
    padding-top: 0;
    padding-bottom: 3rem;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 4rem;
    width: 100%;
    align-items: center;
}

.hero-title {
    font-size: 4rem;
    line-height: 1.15;
    margin-bottom: 1.5rem;
    letter-spacing: -1.5px;
}

.hero-title span {
    background: linear-gradient(135deg, var(--accent) 30%, #a5b4fc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.35rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 580px;
    font-weight: 400;
}

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

/* Button UI */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.8rem 1.8rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.primary-btn {
    background-color: var(--accent);
    color: hsl(222, 47%, 7%) !important;
    box-shadow: 0 4px 20px var(--accent-glow);
}

.primary-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 24px hsla(var(--accent-h), var(--accent-s), var(--accent-l), 0.3);
    opacity: 0.95;
}

.secondary-btn {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.secondary-btn:hover {
    background-color: var(--border-color);
    transform: translateY(-3px);
}

/* ==========================================================================
   DEVELOPER TERMINAL CONSOLE
   ========================================================================== */
.terminal-container {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: var(--radius-md);
    box-shadow: 0 30px 60px -15px rgba(0, 0, 0, 0.4);
    display: flex;
    flex-direction: column;
    height: 380px;
    overflow: hidden;
}

.terminal-header {
    background: rgba(0, 0, 0, 0.25);
    padding: 0.75rem 1rem;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--glass-border);
}

.terminal-header .dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    margin-right: 8px;
    display: inline-block;
}

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

.terminal-title {
    margin-left: auto;
    margin-right: auto;
    font-size: 0.75rem;
    font-family: var(--font-sans);
    color: var(--text-muted);
}

.terminal-body {
    padding: 1.25rem;
    flex-grow: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    line-height: 1.5;
}

.terminal-line {
    word-break: break-word;
}

.system-msg {
    color: var(--text-muted);
}

.bot-msg {
    color: #a5b4fc;
}

.user-msg {
    color: #22c55e;
}

.terminal-line .hl {
    color: var(--accent);
    font-weight: 600;
}

.terminal-input-line {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-top: auto;
    padding-top: 0.5rem;
    border-top: 1px dashed var(--glass-border);
}

.prompt {
    color: var(--accent);
    font-weight: 700;
    flex-grow: 1;
    width: 40%;
}

.terminal-input-line input {
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    flex-grow: 1;
    width: 100%;
}

.terminal-quick-actions {
    background: rgba(0, 0, 0, 0.15);
    padding: 0.75rem 1rem;
    border-top: 1px solid var(--glass-border);
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.action-badge {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-size: 0.75rem;
    padding: 0.35rem 0.75rem;
    border-radius: 20px;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.action-badge:hover {
    border-color: var(--accent);
    color: var(--text-primary);
    background: var(--accent-glow);
    transform: translateY(-1px);
}

/* ==========================================================================
   ABOUT SECTION
   ========================================================================== */
.about-container {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 2.5rem;
    box-shadow: var(--card-shadow);
}

.about-text p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    max-width: 800px;
}

.about-text p:last-child {
    margin-bottom: 0;
}

.about-text strong {
    color: var(--text-primary);
}

/* ==========================================================================
   PROJECTS SECTION
   ========================================================================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.project-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 2.5rem 2rem;
    border-radius: var(--radius-md);
    box-shadow: var(--card-shadow);
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
    height: 100%;
}

/* Accent Glow on Hover */
.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition-smooth);
}

.project-card:hover::before {
    transform: scaleX(1);
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px -15px var(--accent-glow);
    border-color: var(--accent);
}

.project-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.project-icon {
    width: 40px;
    height: 40px;
    background: var(--accent-glow);
    color: var(--accent);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.project-icon svg {
    width: 20px;
    height: 20px;
}

.project-card h3 {
    font-size: 1.35rem;
    font-weight: 700;
}

.project-card p {
    color: var(--text-secondary);
    margin-bottom: 1.75rem;
    font-size: 0.95rem;
    flex-grow: 1;
}

.project-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.tag {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 0.7rem;
    border-radius: 4px;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--accent);
    margin-top: auto;
}

.project-link svg {
    transition: transform 0.3s;
}

.project-link:hover svg {
    transform: translate(2px, -2px);
}

/* ==========================================================================
   SKILLS SECTION
   ========================================================================== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
}

.skill-category {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 2rem;
    box-shadow: var(--card-shadow);
}

.skill-category h3 {
    font-size: 1.25rem;
    margin-bottom: 1.25rem;
    color: var(--text-primary);
    border-left: 3px solid var(--accent);
    padding-left: 0.75rem;
}

.skills-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.skill-badge {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 550;
    transition: var(--transition-smooth);
}

.skill-badge:hover {
    border-color: var(--accent);
    color: var(--text-primary);
    background-color: var(--accent-glow);
    transform: translateY(-2px);
}

/* ==========================================================================
   EDUCATION TIMELINE
   ========================================================================== */
.timeline {
    position: relative;
    padding-left: 2.5rem;
    margin-left: 1rem;
    border-left: 2px solid var(--border-color);
}

.timeline-item {
    position: relative;
    margin-bottom: 3.5rem;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: calc(-2.5rem - 7px);
    top: 8px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--accent);
    border: 2px solid var(--bg-primary);
    box-shadow: 0 0 10px var(--accent);
    transition: var(--transition-smooth);
}

.timeline-item:hover .timeline-marker {
    background-color: var(--text-primary);
    box-shadow: 0 0 14px var(--accent);
}

.timeline-content {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 2rem;
    border-radius: var(--radius-md);
    box-shadow: var(--card-shadow);
}

.edu-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.edu-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
}

.edu-date {
    font-size: 0.85rem;
    color: var(--accent);
    font-weight: 700;
    background-color: var(--accent-glow);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
}

.edu-institution {
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.edu-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* ==========================================================================
   CONTACT SECTION
   ========================================================================== */
#contact {
    text-align: center;
}

#contact h2::after {
    left: 50%;
    transform: translateX(-50%);
}

#contact p {
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    font-size: 1.15rem;
}

.contact-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

/* ==========================================================================
   ANIMATIONS & TRANSITIONS (SCROLL REVEAL)
   ========================================================================== */
.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94), 
                transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.scroll-reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* ==========================================================================
   RESPONSIVE DESIGN (MEDIA QUERIES)
   ========================================================================== */
@media (max-width: 968px) {
    body {
        padding-top: 70px;
    }
    
    nav {
        padding: 1rem 2rem;
    }
    
    section {
        padding: 4rem 1.5rem;
    }
    
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: center;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .terminal-container {
        height: 350px;
        max-width: 500px;
        margin: 0 auto;
        width: 100%;
    }
}

@media (max-width: 640px) {
    .nav-links {
        display: none; /* Simplification: mobile nav could expand but standard flow works with section jumps */
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .contact-buttons {
        flex-direction: column;
        align-items: stretch;
    }
    
    .contact-buttons .btn {
        margin: 0.25rem 0;
    }
    
    .about-container, .timeline-content, .project-card {
        padding: 1.5rem;
    }
}