/**
 * Pream Shah Personal Portfolio Design System
 * Modern Dark Theme with #6CADF9 Blue Accent
 * Clean, Accessible, Performance-Optimized CSS
 */

:root {
    /* Color Palette */
    --bg-main: #0a0f1d;
    --bg-secondary: #0f172a;
    --bg-card: #131c31;
    --bg-card-hover: #17233d;
    --bg-input: #0c1324;
    --bg-surface: #1e293b;

    --accent-blue: #6cadf9;
    --accent-blue-hover: #4d97f2;
    --accent-blue-dim: rgba(108, 173, 249, 0.12);
    --accent-blue-border: rgba(108, 173, 249, 0.28);
    --accent-glow: 0 0 25px rgba(108, 173, 249, 0.15);

    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --text-highlight: #ffffff;

    --border-subtle: #1e2d4d;
    --border-hover: #2e4370;
    --border-focus: #6cadf9;

    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #38bdf8;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

    /* Spacing & Layout */
    --container-max: 1200px;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 9999px;

    /* Shadows & Transitions */
    --shadow-card: 0 4px 20px -2px rgba(0, 0, 0, 0.45);
    --shadow-hover: 0 10px 30px -4px rgba(0, 0, 0, 0.6), 0 0 20px rgba(108, 173, 249, 0.12);
    --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Base Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.65;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}

/* Typography Defaults */
h1, h2, h3, h4, h5, h6 {
    color: var(--text-primary);
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
}

h1 { font-size: clamp(2rem, 5vw, 3.25rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.25rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }
h4 { font-size: 1.15rem; }

p {
    margin-bottom: 1.25rem;
    color: var(--text-secondary);
}

p:last-child {
    margin-bottom: 0;
}

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

a:hover {
    color: var(--accent-blue-hover);
}

a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible {
    outline: 2px solid var(--border-focus);
    outline-offset: 3px;
}

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

/* Layout Utilities */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
}

.section {
    padding: 5rem 0;
}

.section-title {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 3.5rem;
}

.section-tag {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent-blue);
    background: var(--accent-blue-dim);
    border: 1px solid var(--accent-blue-border);
    padding: 0.35rem 0.85rem;
    border-radius: var(--radius-full);
    margin-bottom: 0.85rem;
}

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

/* Navigation */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 15, 29, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-subtle);
    transition: var(--transition);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 4.5rem;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 800;
    font-size: 1.25rem;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.brand-symbol {
    width: 2.25rem;
    height: 2.25rem;
    background: linear-gradient(135deg, #6cadf9, #2563eb);
    color: #ffffff;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.1rem;
    box-shadow: 0 4px 12px rgba(108, 173, 249, 0.3);
}

.brand-logo:hover .brand-symbol {
    transform: translateY(-2px);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
    list-style: none;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
    position: relative;
    padding: 0.5rem 0;
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--accent-blue);
    border-radius: 2px;
}

.nav-cta {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius-sm);
}

/* Mobile Drawer */
.mobile-drawer {
    display: none;
    position: fixed;
    top: 4.5rem;
    left: 0;
    width: 100%;
    height: calc(100vh - 4.5rem);
    background: var(--bg-main);
    padding: 2rem 1.5rem;
    border-top: 1px solid var(--border-subtle);
    z-index: 99;
    flex-direction: column;
    gap: 1.5rem;
    overflow-y: auto;
}

.mobile-drawer.open {
    display: flex;
}

.mobile-drawer .nav-link {
    font-size: 1.25rem;
    font-weight: 600;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-subtle);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid transparent;
    line-height: 1;
}

.btn-primary {
    background: var(--accent-blue);
    color: #050b14;
    font-weight: 700;
}

.btn-primary:hover {
    background: var(--accent-blue-hover);
    color: #050b14;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(108, 173, 249, 0.35);
}

.btn-secondary {
    background: var(--bg-surface);
    color: var(--text-primary);
    border-color: var(--border-subtle);
}

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

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

.btn-outline:hover {
    background: var(--accent-blue-dim);
    border-color: var(--accent-blue);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
}

.btn-lg {
    padding: 0.9rem 2rem;
    font-size: 1.05rem;
}

/* Hero Section */
.hero-section {
    padding: 6rem 0 5rem;
    position: relative;
    overflow: hidden;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 4rem;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 1rem;
    background: var(--accent-blue-dim);
    border: 1px solid var(--accent-blue-border);
    border-radius: var(--radius-full);
    color: var(--accent-blue);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.pulse-dot {
    width: 8px;
    height: 8px;
    background: var(--accent-blue);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--accent-blue);
}

.hero-title {
    margin-bottom: 1.25rem;
    letter-spacing: -0.03em;
}

.hero-title span {
    color: var(--accent-blue);
}

.hero-intro {
    font-size: 1.15rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 2.5rem;
    max-width: 600px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1.25rem;
    margin-bottom: 3rem;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-subtle);
}

.stat-item h3 {
    font-size: 1.85rem;
    color: var(--text-highlight);
    margin-bottom: 0.25rem;
}

.stat-item p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.hero-image-wrapper {
    position: relative;
    display: flex;
    justify-content: center;
}

.hero-avatar {
    width: 320px;
    height: 320px;
    border-radius: 24px;
    object-fit: cover;
    border: 2px solid var(--border-subtle);
    background: var(--bg-card);
    box-shadow: var(--shadow-card), var(--accent-glow);
    position: relative;
    z-index: 2;
}

.hero-avatar-placeholder {
    width: 320px;
    height: 320px;
    border-radius: 24px;
    border: 2px solid var(--border-subtle);
    background: linear-gradient(145deg, #131c31, #0f172a);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--accent-blue);
    box-shadow: var(--shadow-card), var(--accent-glow);
}

.hero-avatar-placeholder svg {
    width: 96px;
    height: 96px;
    margin-bottom: 1rem;
    stroke: var(--accent-blue);
}

.hero-avatar-placeholder span {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-primary);
}

/* Card System */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 2rem;
    transition: var(--transition);
    position: relative;
    box-shadow: var(--shadow-card);
}

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

/* Projects Grid */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 2rem;
}

.project-card {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    padding: 0;
}

.project-cover {
    width: 100%;
    height: 220px;
    object-fit: cover;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-subtle);
}

.project-cover-placeholder {
    width: 100%;
    height: 220px;
    background: linear-gradient(135deg, #131c31, #1e293b);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-blue);
    border-bottom: 1px solid var(--border-subtle);
}

.project-body {
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.project-category {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent-blue);
    margin-bottom: 0.5rem;
}

.project-title {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.project-title a {
    color: var(--text-primary);
}

.project-title a:hover {
    color: var(--accent-blue);
}

.project-summary {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    flex-grow: 1;
}

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

.tech-tag {
    font-size: 0.75rem;
    font-family: var(--font-mono);
    padding: 0.25rem 0.6rem;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
}

.project-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 1rem;
    border-top: 1px solid var(--border-subtle);
    margin-top: auto;
}

.project-links {
    display: flex;
    gap: 1rem;
}

/* Skills Grid */
.skills-grouped-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
}

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

.skill-category-title {
    font-size: 1.15rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-subtle);
    color: var(--text-highlight);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.skills-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.skill-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.skill-name {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.skill-badge {
    font-size: 0.75rem;
    padding: 0.2rem 0.6rem;
    border-radius: var(--radius-full);
    background: var(--accent-blue-dim);
    color: var(--accent-blue);
    font-weight: 600;
}

/* Services Grid */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
}

.service-card {
    display: flex;
    flex-direction: column;
}

.service-icon {
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 12px;
    background: var(--accent-blue-dim);
    border: 1px solid var(--accent-blue-border);
    color: var(--accent-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.service-title {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.service-features {
    list-style: none;
    margin: 1.5rem 0;
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.service-features li {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.service-features li svg {
    color: var(--accent-blue);
    flex-shrink: 0;
}

.service-footer {
    margin-top: auto;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Experience Timeline */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 7px;
    width: 2px;
    height: 100%;
    background: var(--border-subtle);
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
}

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

.timeline-dot {
    position: absolute;
    top: 6px;
    left: -2rem;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--bg-main);
    border: 3px solid var(--accent-blue);
    z-index: 2;
}

.timeline-content {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 1.75rem;
}

.timeline-header {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
    gap: 0.5rem;
}

.timeline-title {
    font-size: 1.2rem;
    margin-bottom: 0.25rem;
}

.timeline-org {
    color: var(--accent-blue);
    font-weight: 600;
    font-size: 0.95rem;
}

.timeline-date {
    font-size: 0.85rem;
    color: var(--text-muted);
    background: var(--bg-surface);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
}

/* Blog Articles */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 2rem;
}

.blog-card {
    display: flex;
    flex-direction: column;
}

.blog-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.blog-title {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.blog-excerpt {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.form-control {
    width: 100%;
    padding: 0.85rem 1.15rem;
    background: var(--bg-input);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    transition: var(--transition);
}

.form-control:focus {
    border-color: var(--border-focus);
    background: #0f182c;
    outline: none;
    box-shadow: 0 0 0 3px rgba(108, 173, 249, 0.15);
}

textarea.form-control {
    min-height: 140px;
    resize: vertical;
}

/* Flash Messages */
.alert {
    padding: 1rem 1.5rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.alert-success {
    background: rgba(16, 185, 129, 0.12);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: #34d399;
}

.alert-error {
    background: rgba(239, 68, 68, 0.12);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #f87171;
}

/* Footer */
.site-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-subtle);
    padding: 4rem 0 2rem;
    margin-top: auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-brand p {
    max-width: 380px;
    margin-top: 0.75rem;
    color: var(--text-secondary);
}

.footer-nav-title {
    font-size: 1rem;
    color: var(--text-highlight);
    margin-bottom: 1.25rem;
}

.footer-nav {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-nav a {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

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

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid var(--border-subtle);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Social links list */
.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1.25rem;
}

.social-link {
    width: 2.25rem;
    height: 2.25rem;
    border-radius: var(--radius-sm);
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: var(--transition);
}

.social-link:hover {
    color: var(--accent-blue);
    border-color: var(--accent-blue-border);
    transform: translateY(-2px);
}

/* Responsive Breakpoints */
@media (max-width: 992px) {
    .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 3rem;
    }
    .hero-intro {
        margin-left: auto;
        margin-right: auto;
    }
    .hero-actions {
        justify-content: center;
    }
    .hero-stats {
        max-width: 500px;
        margin: 0 auto;
    }
    .hero-image-wrapper {
        order: -1;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

@media (max-width: 768px) {
    .nav-menu, .nav-cta .btn {
        display: none;
    }
    .mobile-menu-btn {
        display: block;
    }
    .section {
        padding: 3.5rem 0;
    }
    .projects-grid, .services-grid, .blog-grid {
        grid-template-columns: 1fr;
    }
    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}