/* ========================================
   Ronald Montoya - Full Stack Portfolio
   Modern Dark Theme
   ======================================== */

/* === CSS Variables === */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #111119;
    --bg-card: #16161f;
    --bg-card-hover: #1c1c28;
    --border-color: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(255, 255, 255, 0.12);

    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #6366f1, #8b5cf6, #a78bfa);
    --accent-glow: rgba(99, 102, 241, 0.15);

    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;

    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Space Grotesk', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    --nav-height: 72px;
    --container-max: 1200px;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 20px;

    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    --navbar-scrolled-bg: rgba(10, 10, 15, 0.85);
    --overlay-bg: rgba(0, 0, 0, 0.5);
    --shadow-color: rgba(0, 0, 0, 0.3);
    --particle-color: rgba(255, 255, 255, 0.06);
}

/* === Light Theme === */
[data-theme="light"] {
    --bg-primary: #f8f9fc;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --bg-card-hover: #f1f3f8;
    --border-color: rgba(0, 0, 0, 0.08);
    --border-hover: rgba(0, 0, 0, 0.15);

    --text-primary: #1a1a2e;
    --text-secondary: #4a5568;
    --text-muted: #718096;

    --accent-primary: #5b5ef0;
    --accent-secondary: #7c3aed;
    --accent-gradient: linear-gradient(135deg, #5b5ef0, #7c3aed, #9061f9);
    --accent-glow: rgba(91, 94, 240, 0.08);

    --navbar-scrolled-bg: rgba(255, 255, 255, 0.85);
    --overlay-bg: rgba(0, 0, 0, 0.3);
    --shadow-color: rgba(0, 0, 0, 0.1);
    --particle-color: rgba(0, 0, 0, 0.04);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.4s ease, color 0.4s ease;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-fast);
}

ul { list-style: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea { font-family: inherit; }

::selection {
    background: var(--accent-primary);
    color: white;
}

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb {
    background: var(--accent-primary);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover { background: var(--accent-secondary); }

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* === Cursor Glow === */
.cursor-glow {
    position: fixed;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    pointer-events: none;
    z-index: 1;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
    transform: translate(-50%, -50%);
    transition: opacity 0.3s;
    opacity: 0;
}

body:hover .cursor-glow { opacity: 1; }

/* === Preloader === */
.preloader {
    position: fixed;
    inset: 0;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.preloader.hidden {
    opacity: 0;
    visibility: hidden;
}

.preloader-inner {
    position: relative;
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.preloader-circle {
    position: absolute;
    inset: 0;
    border: 2px solid transparent;
    border-top-color: var(--accent-primary);
    border-right-color: var(--accent-secondary);
    border-radius: 50%;
    animation: preloaderSpin 1s linear infinite;
}

.preloader-text {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

@keyframes preloaderSpin {
    to { transform: rotate(360deg); }
}

/* === Navigation === */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    z-index: 1000;
    transition: all var(--transition-normal);
    background: transparent;
}

.navbar.scrolled {
    background: var(--navbar-scrolled-bg);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: 1.3rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 2px;
}

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

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

.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 8px 16px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: 8px;
    transition: all var(--transition-fast);
    position: relative;
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--accent-gradient);
    border-radius: 1px;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.nav-cta {
    padding: 10px 24px;
    font-size: 0.875rem;
    font-weight: 600;
    color: white;
    background: var(--accent-gradient);
    border-radius: 8px;
    transition: all var(--transition-fast);
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.3);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 4px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-normal);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* === Hero Section === */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 120px 24px 120px;
}

.hero-particles {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-grid-bg {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(99, 102, 241, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    text-align: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(99, 102, 241, 0.08);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 50px;
    font-size: 0.85rem;
    color: var(--accent-primary);
    margin-bottom: 32px;
    font-weight: 500;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.5); }
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    color: var(--accent-primary);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    min-height: 2em;
}

.typed-prefix {
    color: var(--accent-secondary);
}

.typed-cursor {
    animation: blink 1s infinite;
    color: var(--accent-primary);
}

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

.hero-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

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

.hero-buttons {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 60px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: 10px;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    color: white;
    background: var(--accent-gradient);
    border: none;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(99, 102, 241, 0.35);
}

.btn-primary i { transition: transform var(--transition-fast); }
.btn-primary:hover i { transform: translateX(4px); }

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

.btn-outline:hover {
    border-color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.05);
    transform: translateY(-3px);
}

.btn-full { width: 100%; justify-content: center; }

/* Hero Stats */
.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
    margin-bottom: 60px;
}

.hero-stat { text-align: center; }

.stat-number {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-plus {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.hero-stat-divider {
    width: 1px;
    height: 50px;
    background: var(--border-color);
}

/* Hero Scroll Indicator */
.hero-scroll {
    position: absolute;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.scroll-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.scroll-text {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 3px;
    color: var(--text-muted);
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: var(--accent-primary);
    animation: scrollLine 2s infinite;
}

@keyframes scrollLine {
    0% { transform: scaleY(0); transform-origin: top; }
    50% { transform: scaleY(1); transform-origin: top; }
    51% { transform: scaleY(1); transform-origin: bottom; }
    100% { transform: scaleY(0); transform-origin: bottom; }
}

/* Hero Social */
.hero-social {
    position: absolute;
    right: 40px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 2;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.hero-social a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-muted);
    font-size: 1rem;
    transition: all var(--transition-normal);
}

.hero-social a:hover {
    color: var(--accent-primary);
    border-color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.05);
    transform: translateY(-3px);
}

/* === Section Styles === */
.section {
    padding: 120px 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--accent-primary);
    display: block;
    margin-bottom: 12px;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
}

.section-line {
    width: 60px;
    height: 3px;
    background: var(--accent-gradient);
    margin: 0 auto;
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 550px;
    margin: 20px auto 0;
}

/* === About Section === */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 80px;
    align-items: center;
}

.about-grid--full {
    grid-template-columns: 1fr;
    max-width: 800px;
    margin: 0 auto;
}

.about-img-wrapper {
    position: relative;
    width: 100%;
    max-width: 380px;
    aspect-ratio: 4/5;
    margin: 0 auto;
}

.about-img-placeholder {
    width: 100%;
    height: 100%;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    position: relative;
    overflow: hidden;
}

.about-img-placeholder::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05), rgba(139, 92, 246, 0.05));
}

.about-img-placeholder i {
    font-size: 3rem;
    color: var(--accent-primary);
    opacity: 0.3;
}

.about-img-placeholder span {
    font-family: var(--font-display);
    font-size: 4rem;
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.about-img-border {
    position: absolute;
    inset: -8px;
    border: 2px solid var(--accent-primary);
    border-radius: calc(var(--border-radius-lg) + 4px);
    opacity: 0.15;
}

.about-img-dots {
    position: absolute;
    bottom: -20px;
    right: -20px;
    width: 80px;
    height: 80px;
    background-image: radial-gradient(circle, var(--accent-primary) 1.5px, transparent 1.5px);
    background-size: 12px 12px;
    opacity: 0.3;
}

.about-experience-badge {
    position: absolute;
    bottom: -10px;
    left: -20px;
    background: var(--accent-gradient);
    padding: 20px;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: 0 15px 40px rgba(99, 102, 241, 0.3);
}

.exp-number {
    font-family: var(--font-display);
    font-size: 2.2rem;
    font-weight: 800;
    color: white;
    line-height: 1;
}

.exp-text {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.85);
    line-height: 1.3;
    font-weight: 500;
}

.about-subtitle {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.about-text {
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-size: 0.98rem;
}

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

.about-info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin: 32px 0 32px;
}

.about-info-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
}

.about-info-item i {
    color: var(--accent-primary);
    font-size: 1rem;
    width: 20px;
    text-align: center;
}

.info-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.info-value {
    display: block;
    font-size: 0.9rem;
    color: var(--text-primary);
    font-weight: 500;
}

/* === Services Section === */
.services {
    background: var(--bg-secondary);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.service-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 36px 28px;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent-gradient);
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.service-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-8px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

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

.service-icon-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.service-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(99, 102, 241, 0.08);
    border: 1px solid rgba(99, 102, 241, 0.15);
    border-radius: var(--border-radius-sm);
    font-size: 1.4rem;
    color: var(--accent-primary);
    transition: all var(--transition-normal);
}

.service-card:hover .service-icon {
    background: var(--accent-gradient);
    color: white;
    border-color: transparent;
}

.service-number {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--bg-card-hover);
    transition: color var(--transition-normal);
}

.service-card:hover .service-number { color: var(--bg-card); }

.service-title {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.service-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.7;
}

.service-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.service-tech li {
    padding: 4px 12px;
    font-size: 0.75rem;
    background: rgba(99, 102, 241, 0.06);
    border: 1px solid rgba(99, 102, 241, 0.12);
    border-radius: 50px;
    color: var(--accent-primary);
    font-weight: 500;
}

/* === Skills Section === */
.skills-showcase {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
}

.skill-category {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 32px;
    transition: all var(--transition-normal);
}

.skill-category:hover {
    border-color: var(--border-hover);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.category-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 28px;
}

.category-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(99, 102, 241, 0.08);
    border-radius: var(--border-radius-sm);
    color: var(--accent-primary);
    font-size: 1.1rem;
}

.category-title {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 700;
}

.skill-bars {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.skill-bar-item { width: 100%; }

.skill-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
}

.skill-name {
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.skill-percent {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-primary);
}

.skill-bar {
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.04);
    border-radius: 3px;
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    width: 0;
    background: var(--bar-color, var(--accent-primary));
    border-radius: 3px;
    transition: width 1.5s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.skill-progress::after {
    content: '';
    position: absolute;
    right: 0;
    top: 0;
    width: 20px;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3));
    border-radius: 3px;
}

/* Tech Icons Strip */
.tech-icons-strip {
    margin-top: 60px;
    overflow: hidden;
    mask-image: linear-gradient(90deg, transparent, black 10%, black 90%, transparent);
    -webkit-mask-image: linear-gradient(90deg, transparent, black 10%, black 90%, transparent);
}

.tech-icons-track {
    display: flex;
    gap: 48px;
    animation: scrollIcons 30s linear infinite;
    width: max-content;
}

.tech-icon-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.tech-icon-item i {
    font-size: 2rem;
    color: var(--text-muted);
    transition: color var(--transition-normal);
}

.tech-icon-item span {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 500;
}

.tech-icon-item:hover i { color: var(--accent-primary); }

@keyframes scrollIcons {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* === Experience Section === */
.experience {
    background: var(--bg-secondary);
}

.experience-tabs {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 48px;
}

.exp-tab {
    padding: 12px 28px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-muted);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all var(--transition-normal);
}

.exp-tab:hover {
    color: var(--text-primary);
    border-color: var(--border-hover);
}

.exp-tab.active {
    color: white;
    background: var(--accent-gradient);
    border-color: transparent;
}

.timeline-container.hidden { display: none; }

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 6px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--accent-primary), var(--accent-secondary), transparent);
}

.timeline-item {
    position: relative;
    margin-bottom: 40px;
}

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

.timeline-dot {
    position: absolute;
    left: -40px;
    top: 6px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent-primary);
    border: 3px solid var(--bg-secondary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
    z-index: 1;
}

.timeline-content {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 28px;
    transition: all var(--transition-normal);
}

.timeline-content:hover {
    border-color: var(--border-hover);
    transform: translateX(4px);
}

.timeline-date {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--accent-primary);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.timeline-date i { font-size: 0.75rem; }

.timeline-title {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.timeline-company {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: 12px;
}

.timeline-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.timeline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.timeline-tags span {
    padding: 4px 12px;
    font-size: 0.75rem;
    background: rgba(99, 102, 241, 0.06);
    border: 1px solid rgba(99, 102, 241, 0.12);
    border-radius: 50px;
    color: var(--accent-primary);
    font-weight: 500;
}

/* === Portfolio Section === */
.portfolio-filters {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 48px;
}

.filter-btn {
    padding: 10px 24px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-muted);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: all var(--transition-normal);
}

.filter-btn:hover {
    color: var(--text-primary);
    border-color: var(--border-hover);
}

.filter-btn.active {
    color: white;
    background: var(--accent-gradient);
    border-color: transparent;
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.portfolio-item {
    transition: all 0.4s ease;
}

.portfolio-item.hidden-item {
    opacity: 0;
    transform: scale(0.8);
    position: absolute;
    pointer-events: none;
}

.portfolio-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.portfolio-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-8px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.portfolio-img {
    position: relative;
    aspect-ratio: 16/10;
    overflow: hidden;
}

.portfolio-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--bg-card-hover), var(--bg-card));
    display: flex;
    align-items: center;
    justify-content: center;
}

.portfolio-placeholder i {
    font-size: 3rem;
    color: var(--accent, var(--accent-primary));
    opacity: 0.4;
}

.portfolio-overlay {
    position: absolute;
    inset: 0;
    background: rgba(99, 102, 241, 0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

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

.portfolio-actions {
    display: flex;
    gap: 12px;
}

.portfolio-action {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: 50%;
    color: white;
    font-size: 1rem;
    transition: all var(--transition-fast);
    transform: translateY(20px);
}

.portfolio-card:hover .portfolio-action {
    transform: translateY(0);
}

.portfolio-action:hover {
    background: white;
    color: var(--accent-primary);
}

.portfolio-info {
    padding: 24px;
}

.portfolio-info h3 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.portfolio-info p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.6;
}

.portfolio-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.portfolio-tech span {
    padding: 3px 10px;
    font-size: 0.72rem;
    background: rgba(99, 102, 241, 0.06);
    border: 1px solid rgba(99, 102, 241, 0.12);
    border-radius: 50px;
    color: var(--accent-primary);
    font-weight: 500;
}

.portfolio-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 12px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-primary);
    transition: all var(--transition-fast);
}

.portfolio-link:hover {
    color: var(--accent-secondary);
    transform: translateX(4px);
}

.portfolio-link i {
    font-size: 0.75rem;
}

/* === Testimonials Section === */
.testimonials {
    background: var(--bg-secondary);
}

.testimonials-slider {
    max-width: 900px;
    margin: 0 auto;
    overflow: hidden;
}

.testimonials-track {
    display: flex;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.testimonial-card {
    min-width: 100%;
    padding: 48px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    text-align: center;
    position: relative;
}

.testimonial-quote {
    color: var(--accent-primary);
    font-size: 2rem;
    opacity: 0.3;
    margin-bottom: 16px;
}

.testimonial-text {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.8;
    max-width: 700px;
    margin: 0 auto 32px;
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
    margin-bottom: 16px;
}

.author-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
    color: white;
}

.author-info h4 {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
}

.author-info span {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.testimonial-rating {
    display: flex;
    justify-content: center;
    gap: 4px;
}

.testimonial-rating i {
    color: #f59e0b;
    font-size: 0.9rem;
}

.testimonials-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-top: 32px;
}

.test-nav-btn {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    color: var(--text-muted);
    transition: all var(--transition-normal);
}

.test-nav-btn:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.test-dots {
    display: flex;
    gap: 8px;
}

.test-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--border-color);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.test-dot.active {
    background: var(--accent-primary);
    transform: scale(1.2);
}

/* === Contact Section === */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 48px;
    align-items: start;
}

.contact-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    margin-bottom: 16px;
    transition: all var(--transition-normal);
}

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

.contact-card-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(99, 102, 241, 0.08);
    border-radius: var(--border-radius-sm);
    color: var(--accent-primary);
    font-size: 1.2rem;
    flex-shrink: 0;
}

.contact-card-content h4 {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: 2px;
}

.contact-card-content a,
.contact-card-content span {
    font-size: 0.95rem;
    color: var(--text-primary);
    font-weight: 500;
}

.contact-card-content a:hover { color: var(--accent-primary); }

.contact-social {
    display: flex;
    gap: 12px;
    margin-top: 24px;
}

.social-link {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--text-muted);
    font-size: 1.1rem;
    transition: all var(--transition-normal);
}

.social-link:hover {
    color: var(--accent-primary);
    border-color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.05);
    transform: translateY(-3px);
}

/* Contact Form */
.contact-form {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 40px;
}

.form-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

.form-field {
    position: relative;
    margin-bottom: 20px;
}

.form-group .form-field { margin-bottom: 0; }

.form-field input,
.form-field textarea {
    width: 100%;
    padding: 16px 0 8px;
    font-size: 0.95rem;
    color: var(--text-primary);
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--border-color);
    outline: none;
    transition: border-color var(--transition-normal);
}

.form-field textarea { resize: vertical; min-height: 120px; }

.form-field label {
    position: absolute;
    left: 0;
    top: 16px;
    font-size: 0.9rem;
    color: var(--text-muted);
    pointer-events: none;
    transition: all var(--transition-normal);
}

.form-field input:focus ~ label,
.form-field input:not(:placeholder-shown) ~ label,
.form-field textarea:focus ~ label,
.form-field textarea:not(:placeholder-shown) ~ label {
    top: -4px;
    font-size: 0.72rem;
    color: var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-line {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-gradient);
    transition: width var(--transition-normal);
}

.form-field input:focus ~ .form-line,
.form-field textarea:focus ~ .form-line {
    width: 100%;
}

/* === Footer === */
.footer {
    padding: 48px 0;
    border-top: 1px solid var(--border-color);
}

.footer-content { text-align: center; }

.footer-logo {
    font-family: var(--font-mono);
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.footer-text {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.footer-divider {
    width: 60px;
    height: 1px;
    background: var(--border-color);
    margin: 0 auto 24px;
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
}

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

.back-to-top {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    color: var(--text-muted);
    transition: all var(--transition-normal);
}

.back-to-top:hover {
    color: var(--accent-primary);
    border-color: var(--accent-primary);
    transform: translateY(-3px);
}

/* === Theme Toggle Button === */
.theme-toggle {
    position: relative;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    cursor: pointer;
    background: none;
    border: 1px solid var(--border-color);
}

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

.theme-toggle i {
    font-size: 1.1rem;
    transition: transform 0.4s ease;
}

.theme-toggle:hover i {
    transform: rotate(30deg);
}

.theme-toggle .fa-sun { display: none; }
.theme-toggle .fa-moon { display: inline-block; }

[data-theme="light"] .theme-toggle .fa-sun { display: inline-block; }
[data-theme="light"] .theme-toggle .fa-moon { display: none; }

/* Light theme specific overrides */
[data-theme="light"] .hero-grid-bg {
    background-image:
        linear-gradient(var(--particle-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--particle-color) 1px, transparent 1px);
}

[data-theme="light"] .nav-cta {
    color: #ffffff;
}

[data-theme="light"] ::selection {
    color: #ffffff;
}

[data-theme="light"] .skill-bar-fill::after {
    color: #ffffff;
}

[data-theme="light"] .btn-primary {
    color: #ffffff;
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

@media (max-width: 1024px) {
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .portfolio-grid { grid-template-columns: repeat(2, 1fr); }
    .skills-showcase { grid-template-columns: 1fr 1fr; }
    .about-grid { gap: 48px; }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 320px;
        height: 100vh;
        background: var(--bg-secondary);
        border-left: 1px solid var(--border-color);
        flex-direction: column;
        padding: 100px 32px 32px;
        gap: 4px;
        transition: right var(--transition-normal);
        z-index: 999;
    }

    .nav-menu.open { right: 0; }

    .nav-link {
        padding: 14px 16px;
        font-size: 1rem;
        width: 100%;
        border-radius: 8px;
    }

    .nav-link:hover { background: var(--bg-card); }

    .nav-toggle { display: flex; }
    .nav-cta { display: none; }

    .hero-social { display: none; }

    .hero-title { font-size: clamp(2rem, 8vw, 3rem); }
    .hero-subtitle { font-size: 1rem; }

    .hero-buttons { flex-direction: column; width: 100%; max-width: 300px; margin: 0 auto 40px; }
    .hero-buttons .btn { width: 100%; justify-content: center; }

    .hero-stats { gap: 24px; }
    .stat-number { font-size: 1.8rem; }
    .hero-stat-divider { height: 40px; }

    .section { padding: 80px 0; }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .about-image { order: 0; }
    .about-img-wrapper { max-width: 280px; }

    .services-grid { grid-template-columns: 1fr; }
    .skills-showcase { grid-template-columns: 1fr; }
    .portfolio-grid { grid-template-columns: 1fr; }

    .contact-grid { grid-template-columns: 1fr; }
    .contact-form { padding: 28px; }
    .form-group { grid-template-columns: 1fr; }

    .about-info-grid { grid-template-columns: 1fr; }

    .testimonial-card { padding: 32px 20px; }
}

@media (max-width: 480px) {
    .hero { padding: 100px 16px 120px; }
    .hero-description { font-size: 0.95rem; }
    .container { padding: 0 16px; }
    .skill-category { padding: 24px; }
    .service-card { padding: 28px 20px; }

    .hero-stats {
        flex-direction: column;
        gap: 16px;
    }
    .hero-stat-divider {
        width: 50px;
        height: 1px;
    }

    .portfolio-filters { gap: 6px; }
    .filter-btn { padding: 8px 16px; font-size: 0.8rem; }
}

/* === Overlay for mobile menu === */
.nav-overlay {
    position: fixed;
    inset: 0;
    background: var(--overlay-bg);
    z-index: 998;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal);
}

.nav-overlay.visible {
    opacity: 1;
    pointer-events: all;
}