/* ==========================================================================
   DESIGN SYSTEM & VARIABLES
   ========================================================================== */
:root {
    /* Fonts */
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;

    /* Theme Colors (Light Theme) */
    --bg-primary: #f6f9fc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #eef2f7;
    --card-bg: rgba(255, 255, 255, 0.7);
    
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    
    --primary-color: #6366f1; /* Royal Indigo */
    --secondary-color: #06b6d4; /* Electric Cyan */
    --accent-color: #f43f5e; /* Rose */
    
    --gradient-primary: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    --gradient-accent: linear-gradient(135deg, var(--accent-color), var(--primary-color));
    --text-gradient: linear-gradient(135deg, var(--primary-color) 30%, var(--secondary-color) 100%);
    
    --glass-bg: rgba(255, 255, 255, 0.45);
    --glass-border: rgba(255, 255, 255, 0.4);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.08);

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 50px -12px rgba(0, 0, 0, 0.1);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.2);

    /* Transitions & Borders */
    --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    --border-radius-sm: 8px;
    --border-radius-md: 16px;
    --border-radius-lg: 24px;
    
    --scroll-progress-bg: rgba(99, 102, 241, 0.15);
}

.dark-theme {
    /* Theme Colors (Dark Theme) */
    --bg-primary: #0b0f19;
    --bg-secondary: #111827;
    --bg-tertiary: #1f2937;
    --card-bg: rgba(17, 24, 39, 0.7);
    
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    
    --glass-bg: rgba(17, 24, 39, 0.6);
    --glass-border: rgba(255, 255, 255, 0.05);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.3), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 20px 50px -12px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.45);
    
    --scroll-progress-bg: rgba(6, 182, 212, 0.2);
}

/* ==========================================================================
   RESET & GLOBAL STYLES
   ========================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.5s ease, color 0.3s ease;
}

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

ul {
    list-style: none;
}

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

button, input, textarea {
    font-family: inherit;
    outline: none;
    border: none;
    background: none;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.section-padding {
    padding: 100px 0;
}

/* Scrollbar Style */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 5px;
    border: 3px solid var(--bg-primary);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

/* Scroll Progress */
.scroll-progress-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--scroll-progress-bg);
    z-index: 1001;
}

.scroll-progress-bar {
    height: 100%;
    width: 0%;
    background: var(--gradient-primary);
    transition: width 0.1s ease-out;
}

/* Custom Cursor */
.custom-cursor {
    width: 40px;
    height: 40px;
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    position: fixed;
    transform: translate(-50%, -50%);
    pointer-events: none;
    z-index: 9999;
    transition: width 0.3s ease, height 0.3s ease, background-color 0.3s ease, border-color 0.3s ease;
    opacity: 0;
}

.custom-cursor-dot {
    width: 8px;
    height: 8px;
    background-color: var(--secondary-color);
    border-radius: 50%;
    position: fixed;
    transform: translate(-50%, -50%);
    pointer-events: none;
    z-index: 9999;
    opacity: 0;
    transition: transform 0.1s ease;
}

/* Media query to disable custom cursor on touch devices */
@media (hover: none) and (pointer: coarse) {
    .custom-cursor, .custom-cursor-dot {
        display: none !important;
    }
}

/* Utility Gradients & Badges */
.text-gradient {
    background: var(--text-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

.section-tag {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--secondary-color);
    display: block;
    margin-bottom: 8px;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-primary);
}

.section-underline {
    width: 60px;
    height: 4px;
    background: var(--gradient-primary);
    margin: 12px auto 0;
    border-radius: 2px;
}

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

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 28px;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.95rem;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #ffffff;
    box-shadow: var(--shadow-glow);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: var(--transition-slow);
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: var(--glass-bg);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(8px);
}

.btn-secondary:hover {
    background: var(--gradient-primary);
    color: #ffffff;
    border-color: transparent;
    transform: translateY(-3px);
}

/* ==========================================================================
   HEADER / NAVBAR
   ========================================================================== */
.navbar-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 80px;
    z-index: 1000;
    transition: var(--transition-normal);
    background: transparent;
}

.navbar-header.scrolled {
    height: 70px;
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}

.navbar-container {
    max-width: 1200px;
    height: 100%;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.6rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 6px;
}

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

.logo-dot {
    width: 8px;
    height: 8px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: inline-block;
}

.nav-menu {
    display: flex;
    gap: 32px;
}

.nav-link {
    font-family: var(--font-heading);
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-secondary);
    position: relative;
    padding: 6px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition-fast);
}

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

.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}

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

/* Theme Toggle */
.theme-toggle-btn {
    width: 44px;
    height: 44px;
    border-radius: var(--border-radius-md);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.theme-toggle-btn:hover {
    background: var(--bg-tertiary);
    transform: rotate(15deg);
}

.theme-toggle-btn .sun-icon {
    display: none;
}

.dark-theme .theme-toggle-btn .moon-icon {
    display: none;
}

.dark-theme .theme-toggle-btn .sun-icon {
    display: block;
}

/* Mobile Toggle */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 20px;
    cursor: pointer;
    z-index: 1002;
}

.mobile-menu-btn .bar {
    height: 3px;
    width: 100%;
    background-color: var(--text-primary);
    border-radius: 9px;
    transition: var(--transition-fast);
}

/* Hamburger transition */
.mobile-menu-btn.open .bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}
.mobile-menu-btn.open .bar:nth-child(2) {
    opacity: 0;
}
.mobile-menu-btn.open .bar:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero-section {
    min-height: 100vh;
    padding-top: 120px;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

/* Background grid details */
.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: radial-gradient(var(--glass-border) 1px, transparent 1px);
    background-size: 24px 24px;
    opacity: 0.5;
    z-index: -1;
}

.hero-container {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 40px;
    align-items: center;
}

.hero-tagline {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--secondary-color);
    letter-spacing: 1px;
    display: block;
    margin-bottom: 12px;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 3.8rem;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 16px;
}

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

.hero-subtitle {
    font-size: 1.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 24px;
    height: 40px;
}

.typing-cursor {
    color: var(--primary-color);
    font-weight: bold;
    animation: blink 0.8s infinite;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 36px;
    max-width: 580px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
}

/* Quick Stats */
.hero-stats {
    display: flex;
    gap: 32px;
    border-top: 1px solid var(--glass-border);
    padding-top: 32px;
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-num {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1;
}

.stat-plus {
    color: var(--secondary-color);
    font-weight: bold;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 6px;
}

/* Hero Visual Graphic */
.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.image-wrapper {
    position: relative;
    width: 380px;
    height: 380px;
    border-radius: 50%;
    z-index: 1;
}

.avatar-glow {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: var(--gradient-primary);
    filter: blur(40px);
    opacity: 0.25;
    z-index: -1;
    animation: pulse 6s infinite alternate;
}

.hero-avatar {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
    border: 4px solid var(--glass-border);
    box-shadow: var(--shadow-lg);
    background: var(--bg-secondary);
    transition: var(--transition-normal);
}

.hero-avatar:hover {
    transform: scale(1.03);
    border-color: var(--primary-color);
}

/* Floating Glass Cards */
.floating-card {
    position: absolute;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: var(--glass-shadow);
    padding: 12px 20px;
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: 2;
    animation: float 4s ease-in-out infinite;
}

.floating-card i {
    font-size: 1.5rem;
}

.floating-card h4 {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 700;
}

.floating-card p {
    font-size: 0.7rem;
    color: var(--text-muted);
}

.card-1 {
    top: 40px;
    left: -40px;
}

.card-2 {
    bottom: 60px;
    right: -20px;
    animation-delay: 2s;
}

/* Scroll Down Indicator */
.scroll-down-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 600;
    letter-spacing: 1px;
    cursor: pointer;
}

.scroll-down-indicator i {
    font-size: 0.9rem;
    animation: bounce 2s infinite;
}

/* ==========================================================================
   ABOUT SECTION
   ========================================================================== */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    margin-top: 60px;
    align-items: start;
}

.about-info-title {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 20px;
}

.about-info-text {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

/* Tabs Panel */
.about-tabs-container {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--border-radius-lg);
    padding: 32px;
    box-shadow: var(--glass-shadow);
}

.tab-buttons {
    display: flex;
    border-bottom: 1px solid var(--glass-border);
    margin-bottom: 24px;
    gap: 8px;
}

.tab-btn {
    flex: 1;
    padding: 12px;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-secondary);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: var(--transition-fast);
    text-align: center;
}

.tab-btn:hover {
    color: var(--primary-color);
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-contents {
    position: relative;
}

.tab-pane {
    display: none;
    animation: fadeIn 0.5s ease forwards;
}

.tab-pane.active {
    display: block;
}

/* Bio Tab List */
.bio-list li {
    display: grid;
    grid-template-columns: 140px 1fr;
    padding: 10px 0;
    border-bottom: 1px dashed var(--glass-border);
}

.bio-list li:last-child {
    border-bottom: none;
}

/* Education Tab Items */
.edu-item {
    position: relative;
}

.edu-year {
    display: inline-block;
    padding: 4px 12px;
    background: var(--primary-color);
    color: #ffffff;
    font-family: var(--font-heading);
    font-size: 0.8rem;
    font-weight: 700;
    border-radius: var(--border-radius-sm);
    margin-bottom: 12px;
}

.edu-item h4 {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.edu-inst {
    font-weight: 500;
    color: var(--secondary-color);
    margin-bottom: 10px;
}

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

/* Certification List */
.cert-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.cert-list li {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px;
    background: var(--card-bg);
    border-radius: var(--border-radius-md);
    border: 1px solid var(--glass-border);
}

.cert-list i {
    font-size: 1.6rem;
}

.cert-list h4 {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 700;
}

.cert-list p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ==========================================================================
   EXPERIENCE TIMELINE
   ========================================================================== */
.timeline {
    position: relative;
    max-width: 900px;
    margin: 50px auto 0;
}

/* Center timeline line */
.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 4px;
    background: var(--glass-border);
    transform: translateX(-50%);
}

.timeline-item {
    position: relative;
    width: 50%;
    padding: 20px 40px;
    margin-bottom: 30px;
}

.timeline-item:nth-child(odd) {
    left: 0;
    text-align: right;
}

.timeline-item:nth-child(even) {
    left: 50%;
    text-align: left;
}

/* Timeline Dot */
.timeline-dot {
    position: absolute;
    top: 30px;
    width: 20px;
    height: 20px;
    background: var(--gradient-primary);
    border: 4px solid var(--bg-primary);
    border-radius: 50%;
    z-index: 2;
    transition: var(--transition-fast);
}

.timeline-item:nth-child(odd) .timeline-dot {
    right: -10px;
}

.timeline-item:nth-child(even) .timeline-dot {
    left: -10px;
}

/* Timeline Date label */
.timeline-date {
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 8px;
}

/* Card Content */
.timeline-content {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    box-shadow: var(--glass-shadow);
    padding: 24px;
    border-radius: var(--border-radius-lg);
    position: relative;
    transition: var(--transition-normal);
}

.timeline-content:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.timeline-content h3 {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 700;
}

.timeline-content .company {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary-color);
    display: block;
    margin-bottom: 12px;
}

.timeline-content .job-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Collapsible expansion styling */
.timeline-expand-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 14px;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--secondary-color);
    cursor: pointer;
}

.timeline-expand-btn i {
    transition: transform 0.3s ease;
}

.timeline-expand-btn.active i {
    transform: rotate(180deg);
}

.timeline-details {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0, 1, 0, 1);
    text-align: left;
}

.timeline-details.open {
    max-height: 500px;
    transition: max-height 0.4s cubic-bezier(1, 0, 1, 0);
}

.timeline-details ul {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px dashed var(--glass-border);
    padding-left: 16px;
    list-style-type: disc;
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Hovering active effects */
.timeline-item:hover .timeline-dot {
    box-shadow: var(--shadow-glow);
    transform: scale(1.2);
}

/* Responsive timeline setup */
@media (max-width: 768px) {
    .timeline::before {
        left: 20px;
    }
    
    .timeline-item {
        width: 100%;
        padding-left: 50px;
        padding-right: 0;
        text-align: left !important;
    }
    
    .timeline-item:nth-child(even) {
        left: 0;
    }
    
    .timeline-dot {
        left: 10px !important;
    }
}

/* ==========================================================================
   SKILLS SECTION
   ========================================================================== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.skills-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-radius: var(--border-radius-lg);
    padding: 32px;
    box-shadow: var(--glass-shadow);
    transition: var(--transition-normal);
}

.skills-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
}

.skills-card-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 28px;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 16px;
}

.skills-card-header i {
    font-size: 2rem;
}

.skills-card-header h3 {
    font-family: var(--font-heading);
    font-size: 1.35rem;
    font-weight: 700;
}

.skills-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.skill-progress-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.skill-info {
    display: flex;
    justify-content: space-between;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.skill-pct {
    color: var(--primary-color);
}

.progress-bg {
    width: 100%;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    width: 0; /* Animated dynamically by JS scroll trigger */
    background: var(--gradient-primary);
    border-radius: 4px;
    transition: width 1.5s cubic-bezier(0.1, 1, 0.1, 1);
}

/* ==========================================================================
   PORTFOLIO SECTION
   ========================================================================== */
.portfolio-filters {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 40px;
    margin-bottom: 40px;
}

.filter-btn {
    padding: 10px 24px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    font-family: var(--font-heading);
    font-weight: 600;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: var(--transition-fast);
}

.filter-btn:hover, .filter-btn.active {
    background: var(--gradient-primary);
    color: #ffffff;
    border-color: transparent;
    box-shadow: var(--shadow-glow);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 30px;
}

.portfolio-item-card {
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    background: var(--card-bg);
    transition: var(--transition-normal);
    opacity: 1;
    transform: scale(1);
}

.portfolio-item-card.hide {
    display: none;
}

.project-img-wrapper {
    position: relative;
    width: 100%;
    height: 230px;
    overflow: hidden;
}

.project-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to top, rgba(11, 15, 25, 0.95) 10%, rgba(99, 102, 241, 0.4) 100%);
    opacity: 0;
    transition: var(--transition-normal);
    display: flex;
    align-items: flex-end;
    padding: 24px;
}

.project-info {
    transform: translateY(20px);
    transition: var(--transition-normal);
}

.project-tag {
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--secondary-color);
    text-transform: uppercase;
    letter-spacing: 1px;
    display: inline-block;
    margin-bottom: 6px;
}

.project-info h3 {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 14px;
}

.project-detail-btn {
    padding: 8px 18px;
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: var(--border-radius-sm);
    background: #ffffff;
    color: #0b0f19;
    cursor: pointer;
    transition: var(--transition-fast);
}

.project-detail-btn:hover {
    background: var(--secondary-color);
    color: #ffffff;
}

/* Hover effects for project cards */
.portfolio-item-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary-color);
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

.portfolio-item-card:hover .project-img {
    transform: scale(1.08);
}

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

.portfolio-item-card:hover .project-info {
    transform: translateY(0);
}

/* ==========================================================================
   CONTACT SECTION
   ========================================================================== */
.contact-grid {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 50px;
    margin-top: 50px;
    align-items: stretch;
}

.contact-info-panel {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-radius: var(--border-radius-lg);
    padding: 40px;
    box-shadow: var(--glass-shadow);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.contact-info-panel h3 {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 14px;
}

.contact-panel-desc {
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.contact-details-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-detail-item {
    display: flex;
    align-items: center;
    gap: 16px;
}

.contact-icon-wrapper {
    width: 48px;
    height: 48px;
    border-radius: var(--border-radius-md);
    background: var(--gradient-primary);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: var(--shadow-glow);
}

.contact-detail-item span {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.contact-detail-item h4 {
    font-family: var(--font-heading);
    font-size: 1.05rem;
    font-weight: 600;
}

/* Social links on panel */
.social-links-container {
    margin-top: 36px;
    border-top: 1px solid var(--glass-border);
    padding-top: 24px;
}

.social-links-container h4 {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.social-links {
    display: flex;
    gap: 12px;
}

.social-link-btn {
    width: 42px;
    height: 42px;
    border-radius: var(--border-radius-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: var(--text-secondary);
    transition: var(--transition-normal);
}

.social-link-btn:hover {
    color: #ffffff;
    background: var(--gradient-primary);
    transform: translateY(-3px) rotate(8deg);
    box-shadow: var(--shadow-glow);
    border-color: transparent;
}

/* Contact Form Card */
.contact-form-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-radius: var(--border-radius-lg);
    padding: 40px;
    box-shadow: var(--glass-shadow);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-group {
    position: relative;
    width: 100%;
}

.form-input {
    width: 100%;
    padding: 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition-normal);
}

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

.form-label {
    position: absolute;
    left: 16px;
    top: 16px;
    color: var(--text-muted);
    font-size: 1rem;
    pointer-events: none;
    transition: var(--transition-fast);
}

/* Floating labels effect */
.form-input:focus ~ .form-label,
.form-input:valid ~ .form-label {
    top: -10px;
    left: 12px;
    font-size: 0.75rem;
    padding: 0 6px;
    background: var(--bg-primary);
    border-radius: 4px;
    color: var(--primary-color);
    font-weight: 700;
}

.form-input:focus {
    border-color: var(--primary-color);
    background: var(--bg-secondary);
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.15);
}

/* Validation status colors */
.form-input.valid {
    border-color: #10b981;
}

.form-input.invalid {
    border-color: #ef4444;
}

.input-error {
    font-size: 0.75rem;
    color: #ef4444;
    margin-top: 4px;
    display: none;
    position: absolute;
    bottom: -18px;
    left: 4px;
}

.input-error.show {
    display: block;
}

.form-submit-btn {
    margin-top: 8px;
    width: 100%;
}

/* Status message styling */
.form-status-box {
    margin-top: 14px;
    padding: 12px;
    border-radius: var(--border-radius-sm);
    font-size: 0.9rem;
    text-align: center;
    display: none;
}

.form-status-box.success {
    display: block;
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid #10b981;
    color: #10b981;
}

.form-status-box.error {
    display: block;
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid #ef4444;
    color: #ef4444;
}

/* ==========================================================================
   MODAL DIALOG (PROJECT DETAILS)
   ========================================================================== */
.project-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1500;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
    padding: 20px;
}

.project-modal.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(11, 15, 25, 0.85);
    backdrop-filter: blur(10px);
}

.modal-content-wrapper {
    background: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    width: 100%;
    max-width: 900px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    z-index: 2;
    overflow: hidden;
    position: relative;
    transform: scale(0.9);
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    max-height: 90vh;
}

.project-modal.active .modal-content-wrapper {
    transform: scale(1);
}

.modal-close-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(0,0,0,0.5);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 3;
    transition: var(--transition-fast);
}

.modal-close-btn:hover {
    background: var(--accent-color);
}

.modal-body {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-image-container {
    width: 100%;
    height: 100%;
    min-height: 350px;
    background: var(--bg-tertiary);
}

.modal-image-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.modal-info-container {
    padding: 40px;
    display: flex;
    flex-direction: column;
}

.modal-project-tag {
    font-family: var(--font-heading);
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--secondary-color);
    letter-spacing: 1px;
    text-transform: uppercase;
}

.modal-project-title {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 800;
    margin-top: 4px;
    margin-bottom: 12px;
}

.modal-divider {
    width: 50px;
    height: 3px;
    background: var(--gradient-primary);
    margin-bottom: 20px;
    border-radius: 1.5px;
}

.modal-project-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 24px;
}

.modal-tech-stack {
    margin-bottom: 30px;
}

.modal-tech-stack h3 {
    font-size: 0.9rem;
    color: var(--text-primary);
    margin-bottom: 12px;
}

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

.tech-tag {
    font-size: 0.8rem;
    padding: 6px 14px;
    background: var(--bg-tertiary);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    color: var(--text-secondary);
}

.modal-links {
    display: flex;
    gap: 12px;
    margin-top: auto;
}

.modal-link-btn {
    padding: 10px 20px;
    font-size: 0.85rem;
    flex: 1;
}

/* ==========================================================================
   SCROLL TO TOP BUTTON & FOOTER
   ========================================================================== */
.scroll-to-top-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: var(--border-radius-md);
    background: var(--gradient-primary);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition-normal);
    z-index: 99;
    box-shadow: var(--shadow-glow);
}

.scroll-to-top-btn.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-to-top-btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 25px rgba(99, 102, 241, 0.4);
}

.footer-container {
    background: var(--bg-secondary);
    border-top: 1px solid var(--glass-border);
    padding: 40px 0;
    text-align: center;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.footer-content i {
    color: var(--accent-color);
}

/* ==========================================================================
   ANIMATIONS & SCROLL TRIGGER INTERSECTIONS
   ========================================================================== */
@keyframes blink {
    50% { opacity: 0; }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}

@keyframes pulse {
    0% { transform: scale(0.95); opacity: 0.2; }
    100% { transform: scale(1.05); opacity: 0.35; }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-8px); }
    60% { transform: translateY(-4px); }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Scroll Animation States */
.scroll-anim {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.1, 1, 0.1, 1);
}

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

/* ==========================================================================
   MEDIA QUERIES (RESPONSIVITAS)
   ========================================================================== */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-container {
        gap: 30px;
    }
    
    .image-wrapper {
        width: 320px;
        height: 320px;
    }
    
    .about-content, .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .modal-body {
        grid-template-columns: 1fr;
    }
    
    .modal-image-container {
        min-height: 250px;
    }
}

@media (max-width: 768px) {
    .section-padding {
        padding: 60px 0;
    }
    
    /* Navigation Panel */
    .mobile-menu-btn {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 350px;
        height: 100vh;
        background: var(--bg-secondary);
        border-left: 1px solid var(--glass-border);
        box-shadow: var(--shadow-lg);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 30px;
        z-index: 1001;
        transition: right 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    }
    
    .nav-menu.open {
        right: 0;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .hero-visual {
        order: -1;
        margin-bottom: 20px;
    }
    
    .floating-card {
        display: none; /* Hide floating cards on mobile view to simplify */
    }
    
    .footer-content {
        flex-direction: column;
        gap: 16px;
    }
}