/* ==========================================================================
   DESIGN SYSTEM & CUSTOM VARIABLES
   ========================================================================== */
:root {
    /* Fonts */
    --font-heading: 'Space Grotesk', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

    /* Base Transitions */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Layout */
    --header-height: 80px;
    --border-radius-sm: 8px;
    --border-radius-md: 16px;
    --border-radius-lg: 24px;
    --container-width: 1200px;

    /* Sleek Dark Theme Variables */
    --bg-primary: hsl(225, 25%, 5%);
    --bg-secondary: hsl(225, 24%, 8%);
    --text-primary: hsl(210, 30%, 96%);
    --text-secondary: hsl(210, 14%, 66%);
    --text-muted: hsl(210, 10%, 45%);
    
    /* Colors & Accents */
    --accent: hsl(263, 90%, 65%);
    --accent-cyan: hsl(180, 100%, 50%);
    --accent-indigo: hsl(225, 100%, 60%);
    --accent-gradient: linear-gradient(135deg, var(--accent), var(--accent-cyan));
    --accent-gradient-hover: linear-gradient(135deg, hsl(263, 90%, 70%), hsl(180, 100%, 60%));
    
    /* UI Elements */
    --card-bg: rgba(20, 25, 40, 0.55);
    --card-border: rgba(255, 255, 255, 0.05);
    --card-border-hover: rgba(180, 100, 255, 0.2);
    --input-bg: rgba(15, 20, 35, 0.7);
    --header-bg: rgba(8, 12, 24, 0.7);
    --button-secondary-bg: rgba(255, 255, 255, 0.03);
    --button-secondary-border: rgba(255, 255, 255, 0.1);
    
    /* Shadows & Effects */
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 30px rgba(139, 92, 246, 0.25);
    --shadow-glow-cyan: 0 0 30px rgba(6, 182, 212, 0.25);
    --glass-blur: blur(16px);
}

/* ==========================================================================
   RESET & BASE STYLES
   ========================================================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    height: 100%;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
    min-height: 100%;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* ==========================================================================
   DECORATIVE BACKGROUNDS
   ========================================================================== */
.bg-blur {
    position: fixed;
    width: 60vw;
    height: 60vw;
    border-radius: 50%;
    z-index: -2;
    filter: blur(140px);
    opacity: 0.15;
    pointer-events: none;
    transition: opacity var(--transition-slow);
}

.blur-1 {
    top: -10%;
    right: -10%;
    background: radial-gradient(circle, var(--accent) 0%, transparent 70%);
    animation: floatBlur1 25s infinite alternate ease-in-out;
}

.blur-2 {
    bottom: -15%;
    left: -10%;
    background: radial-gradient(circle, var(--accent-cyan) 0%, transparent 70%);
    animation: floatBlur2 30s infinite alternate ease-in-out;
}

@keyframes floatBlur1 {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(-100px, 50px) scale(1.1); }
}

@keyframes floatBlur2 {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(120px, -70px) scale(0.9); }
}

.grid-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background-image: 
        radial-gradient(circle, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
    background-size: 32px 32px;
    pointer-events: none;
}

/* ==========================================================================
   TYPOGRAPHY
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.25;
    color: var(--text-primary);
}

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

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

ul {
    list-style: none;
}

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

.accent-text {
    color: var(--accent);
}

/* ==========================================================================
   SHARED COMPONENTS (GLASS CARD, BUTTONS, BADGES)
   ========================================================================== */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

.glass-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-md);
    transition: border-color var(--transition-normal), 
                box-shadow var(--transition-normal), 
                transform var(--transition-normal),
                background-color var(--transition-normal);
}

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

/* Button Component */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: transform var(--transition-fast), 
                box-shadow var(--transition-fast), 
                background-color var(--transition-fast), 
                border-color var(--transition-fast);
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background: var(--accent-gradient);
    color: hsl(225, 25%, 98%);
    border: none;
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    background: var(--accent-gradient-hover);
    color: hsl(225, 25%, 100%);
    box-shadow: var(--shadow-glow), 0 8px 20px rgba(139, 92, 246, 0.4);
}

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

.btn-secondary:hover {
    background: var(--card-border-hover);
    border-color: var(--accent);
}

.btn-block {
    width: 100%;
}

/* Badge Component */
.badge {
    display: inline-block;
    padding: 6px 14px;
    background: rgba(139, 92, 246, 0.12);
    border: 1px solid rgba(139, 92, 246, 0.25);
    color: var(--accent);
    font-family: var(--font-heading);
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: 30px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

/* ==========================================================================
   HEADER & NAVIGATION
   ========================================================================== */
.glass-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: var(--header-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--card-border);
    z-index: 100;
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

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

.logo {
    font-family: var(--font-heading);
    font-size: 1.45rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: var(--text-primary);
    transition: transform var(--transition-fast);
}

.logo:hover {
    transform: scale(1.05);
}

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

.nav-link {
    color: var(--text-secondary);
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 500;
    position: relative;
    padding: 8px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--accent-gradient);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform var(--transition-normal);
}

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

.nav-link:hover::after,
.nav-link.active::after {
    transform: scaleX(1);
    transform-origin: left;
}

.nav-link.active {
    color: var(--accent);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}
/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 20px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 101;
}

.mobile-menu-toggle .bar {
    width: 100%;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: transform var(--transition-normal), opacity var(--transition-normal);
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero-section {
    position: relative;
    padding-top: calc(var(--header-height) + 40px);
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-container {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
    align-items: center;
}

.hero-content {
    display: flex;
    flex-direction: flex-start;
    flex-direction: column;
    gap: 20px;
}

.hero-content h1 {
    font-size: 3.5rem;
    line-height: 1.15;
    letter-spacing: -1.5px;
}

.hero-content h2 {
    font-size: 1.8rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-top: 10px;
}

/* Animated Tech Sphere */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.tech-sphere {
    position: relative;
    width: 320px;
    height: 320px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.sphere-ring {
    position: absolute;
    border-radius: 50%;
    border: 1px solid rgba(139, 92, 246, 0.15);
    transition: border-color var(--transition-normal);
}

.ring-1 {
    width: 100%;
    height: 100%;
    border-top: 2px solid var(--accent);
    border-bottom: 2px solid var(--accent-cyan);
    animation: rotateRing1 18s linear infinite;
}

.ring-2 {
    width: 80%;
    height: 80%;
    border-left: 1.5px dashed var(--accent-indigo);
    border-right: 1.5px dashed var(--accent);
    animation: rotateRing2 12s linear infinite reverse;
}

.ring-3 {
    width: 60%;
    height: 60%;
    border-top: 1px solid var(--accent-cyan);
    animation: rotateRing1 8s linear infinite;
}

.sphere-core {
    width: 100px;
    height: 100px;
    background: var(--accent-gradient);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: var(--shadow-glow);
    z-index: 2;
    animation: corePulse 4s alternate infinite ease-in-out;
}

.core-icon {
    width: 42px;
    height: 42px;
    color: hsl(225, 25%, 98%);
}

@keyframes rotateRing1 {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes rotateRing2 {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(-360deg); }
}

@keyframes corePulse {
    0% { transform: scale(1); box-shadow: var(--shadow-glow); }
    100% { transform: scale(1.06); box-shadow: 0 0 45px rgba(139, 92, 246, 0.5), 0 0 25px rgba(6, 182, 212, 0.3); }
}

/* Typing cursor */
.cursor {
    display: inline-block;
    color: var(--accent-cyan);
    font-weight: 700;
    margin-left: 3px;
    animation: blink 0.8s infinite;
}

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

.scroll-down {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10;
}

.scroll-down a {
    color: var(--text-secondary);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    transition: transform var(--transition-fast), color var(--transition-fast);
    animation: bounceScroll 2s infinite ease-in-out;
}

.scroll-down a:hover {
    color: var(--accent);
}

@keyframes bounceScroll {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(8px); }
}

/* ==========================================================================
   SECTION COMMON HEADER
   ========================================================================== */
.section-padding {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.section-tag {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.section-header h2 {
    font-size: 2.5rem;
    letter-spacing: -1px;
}

.header-line {
    width: 60px;
    height: 4px;
    background: var(--accent-gradient);
    border-radius: 2px;
}

/* ==========================================================================
   ABOUT ME SECTION & SKILLS TABS
   ========================================================================== */
.about-grid {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
}

.about-text-column {
    max-width: 800px;
    width: 100%;
    padding: 40px;
}

.about-text-column h3,
.about-skills-column h3 {
    font-size: 1.6rem;
    margin-bottom: 24px;
    letter-spacing: -0.5px;
}

.about-text-column p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.about-meta {
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--card-border);
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 16px;
}

.meta-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.meta-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

.meta-value {
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-primary);
}

/* Skill Tabs Layout */
.skills-tabs {
    display: flex;
    background-color: var(--bg-secondary);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius-sm);
    padding: 4px;
    gap: 4px;
    margin-bottom: 30px;
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.tab-btn {
    flex: 1;
    padding: 10px;
    background: transparent;
    border: none;
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    border-radius: 4px;
    cursor: pointer;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

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

.tab-btn.active {
    background-color: var(--card-bg);
    color: var(--accent);
    box-shadow: var(--shadow-sm);
}

.tab-content {
    display: none;
    flex-direction: column;
    gap: 24px;
}

.tab-content.active {
    display: flex;
    animation: fadeInTab 0.4s ease-out forwards;
}

@keyframes fadeInTab {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

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

.skill-info {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    font-weight: 600;
}

.skill-bar {
    width: 100%;
    height: 8px;
    background-color: var(--bg-secondary);
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid var(--card-border);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.skill-progress {
    height: 100%;
    background: var(--accent-gradient);
    border-radius: 10px;
    width: 0; /* Animated dynamically or preset */
    transition: width var(--transition-slow) cubic-bezier(0.1, 0.8, 0.2, 1);
}

/* ==========================================================================
   PROJECTS SECTION & LIVE DEMO MODAL
   ========================================================================== */
.projects-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
}

.project-card {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    height: 100%;
}

.project-visual {
    height: 180px;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.15) 0%, rgba(6, 182, 212, 0.05) 100%);
    border-bottom: 1px solid var(--card-border);
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.project-visual.second-project {
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.15) 0%, rgba(99, 102, 241, 0.05) 100%);
}

.project-icon-wrapper {
    width: 76px;
    height: 76px;
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: var(--shadow-sm);
    color: var(--accent);
    z-index: 2;
    transition: transform var(--transition-normal), color var(--transition-normal);
}

.project-card:hover .project-icon-wrapper {
    transform: scale(1.1) rotate(5deg);
    color: var(--accent-cyan);
}

.project-tech-pills {
    position: absolute;
    bottom: 16px;
    left: 20px;
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    z-index: 2;
}

.pill {
    padding: 4px 10px;
    background-color: rgba(10, 15, 30, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    backdrop-filter: blur(4px);
}

.project-content {
    padding: 32px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    flex-grow: 1;
}

.project-content h3 {
    font-size: 1.5rem;
    letter-spacing: -0.5px;
}

.project-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
}

.project-features {
    padding-left: 20px;
}

.project-features ul {
    list-style: disc;
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.project-links {
    margin-top: auto;
    padding-top: 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.btn-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    background: transparent;
    border: none;
    padding: 6px 0;
}

.btn-link:hover {
    color: var(--accent);
}

.status-pill {
    font-size: 0.75rem;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    color: hsl(150, 80%, 45%);
    padding: 4px 10px;
    border-radius: 30px;
    cursor: default;
}

.active-demo {
    color: var(--accent-cyan);
}

.active-demo:hover {
    text-shadow: 0 0 10px rgba(6, 182, 212, 0.4);
    color: hsl(180, 100%, 60%);
}

/* SMART HOME LIVE DEMO MODAL */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    z-index: 200;
    transition: opacity var(--transition-normal);
}

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

.modal-content {
    width: 90%;
    max-width: 500px;
    padding: 32px;
    border-color: var(--card-border-hover);
    transform: scale(0.9);
    transition: transform var(--transition-normal);
}

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

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--card-border);
    padding-bottom: 16px;
    margin-bottom: 20px;
}

.modal-header h3 {
    font-size: 1.4rem;
}

.close-modal {
    background: transparent;
    border: none;
    font-size: 2rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color var(--transition-fast);
}

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

.demo-intro {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.demo-dashboard-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.demo-control-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius-sm);
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.demo-control-card h4 {
    font-size: 0.9rem;
    text-align: center;
}

.light-indicator {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: hsl(225, 10%, 20%);
    border: 2px solid var(--card-border);
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.5);
    transition: background-color var(--transition-normal), box-shadow var(--transition-normal);
}

.light-indicator.active {
    background-color: hsl(45, 100%, 65%);
    box-shadow: 0 0 25px rgba(254, 240, 138, 0.7);
    border-color: hsl(45, 100%, 75%);
}

/* Switch styling */
.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 26px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: hsl(225, 15%, 25%);
    transition: .4s;
    border: 1px solid var(--card-border);
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
}

input:checked + .slider {
    background: var(--accent-gradient);
}

input:checked + .slider:before {
    transform: translateX(24px);
}

.slider.round {
    border-radius: 34px;
}

.slider.round:before {
    border-radius: 50%;
}

.temp-display {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent-cyan);
    text-shadow: var(--shadow-glow-cyan);
}

.temp-controls {
    display: flex;
    gap: 12px;
}

.temp-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--button-secondary-border);
    background-color: var(--card-bg);
    color: var(--text-primary);
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: transform var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast);
}

.temp-btn:hover {
    border-color: var(--accent-cyan);
    background-color: var(--bg-primary);
    transform: scale(1.08);
}

/* ==========================================================================
   CERTIFICATES SECTION
   ========================================================================== */
.certificates-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.certificate-card {
    padding: 32px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.cert-badge {
    width: 60px;
    height: 60px;
    border-radius: var(--border-radius-sm);
    background: rgba(139, 92, 246, 0.1);
    border: 1px solid rgba(139, 92, 246, 0.2);
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--accent);
    margin-bottom: 8px;
    transition: transform var(--transition-normal);
}

.certificate-card:hover .cert-badge {
    transform: rotateY(360deg);
}

.certificate-card h3 {
    font-size: 1.25rem;
    letter-spacing: -0.5px;
    line-height: 1.35;
}

.cert-issuer {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 600;
    margin-top: -8px;
}

.cert-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.cert-meta {
    margin-top: auto;
    padding-top: 16px;
    border-top: 1px solid var(--card-border);
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

.cert-link {
    color: var(--accent-cyan);
    font-weight: 600;
    transition: color var(--transition-fast), text-shadow var(--transition-fast);
}

.cert-link:hover {
    color: hsl(180, 100%, 65%);
    text-shadow: 0 0 10px rgba(6, 182, 212, 0.4);
}

/* ==========================================================================
   CONTACT SECTION
   ========================================================================== */
.contact-grid {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 32px;
    align-items: start;
}

.contact-info,
.contact-form-wrapper {
    padding: 40px;
}

.contact-info h3,
.contact-form-wrapper h3 {
    font-size: 1.6rem;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.contact-info > p {
    color: var(--text-secondary);
    margin-bottom: 32px;
}

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

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

.info-icon {
    width: 46px;
    height: 46px;
    border-radius: var(--border-radius-sm);
    background-color: var(--bg-secondary);
    border: 1px solid var(--card-border);
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--accent);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.info-detail {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.info-detail .label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

.info-detail .value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.info-detail a.value:hover {
    color: var(--accent-cyan);
}

.socials-wrapper {
    margin-top: 40px;
    padding-top: 32px;
    border-top: 1px solid var(--card-border);
}

.socials-wrapper h4 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 16px;
}

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

.social-btn {
    width: 44px;
    height: 44px;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--button-secondary-border);
    background-color: transparent;
    color: var(--text-secondary);
    display: flex;
    justify-content: center;
    align-items: center;
    transition: color var(--transition-fast), 
                border-color var(--transition-fast), 
                background-color var(--transition-fast), 
                transform var(--transition-fast);
}

.social-btn:hover {
    color: var(--accent);
    border-color: var(--accent);
    background-color: var(--button-secondary-bg);
    transform: translateY(-2px);
}

/* Copy to Clipboard Tooltip/Hover */
.copyable {
    position: relative;
    cursor: pointer;
}

/* Contact Form Styling */
#contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-group input,
.form-group textarea {
    padding: 12px 16px;
    background-color: var(--input-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.15);
}

.form-group.invalid input,
.form-group.invalid textarea {
    border-color: hsl(350, 80%, 60%);
}

.form-group.invalid input:focus,
.form-group.invalid textarea:focus {
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

.error-msg {
    display: none;
    font-size: 0.8rem;
    color: hsl(350, 80%, 60%);
    font-weight: 500;
}

.form-group.invalid .error-msg {
    display: block;
    animation: fadeInTab 0.3s ease-out;
}

/* Toast Success Alert */
.toast {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--accent-gradient);
    color: hsl(225, 25%, 98%);
    padding: 16px 24px;
    border-radius: var(--border-radius-sm);
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.95rem;
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    transform: translateY(100px);
    opacity: 0;
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), opacity 0.4s;
    z-index: 1000;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.glass-footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--card-border);
    padding: 40px 0;
    margin-top: 60px;
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

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

/* ==========================================================================
   RESPONSIVENESS (MOBILE FIRST ADAPTATIONS)
   ========================================================================== */
@media (max-width: 992px) {
    h1 { font-size: 2.8rem; }
    
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }
    
    .hero-content {
        align-items: center;
    }
    
    .hero-description {
        margin: 0 auto;
    }
    
    .about-grid,
    .projects-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .certificates-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 70px;
    }
    
    .section-padding {
        padding: 70px 0;
    }
    
    .section-header {
        margin-bottom: 40px;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    /* Hamburger Menu Toggle Display */
    .mobile-menu-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: var(--header-height);
        left: 0;
        width: 100%;
        height: calc(100vh - var(--header-height));
        background-color: var(--bg-primary);
        border-top: 1px solid var(--card-border);
        padding: 40px 24px;
        transform: translateX(-100%);
        transition: transform var(--transition-normal), background-color var(--transition-normal);
    }
    
    .nav-menu.active {
        transform: translateX(0);
    }
    
    .nav-menu ul {
        flex-direction: column;
        gap: 24px;
        align-items: center;
    }
    
    .nav-link {
        font-size: 1.2rem;
    }
    
    /* Hamburger Active Rotation */
    .mobile-menu-toggle.active .bar:nth-child(1) {
        transform: translateY(9px) rotate(45deg);
    }
    
    .mobile-menu-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-menu-toggle.active .bar:nth-child(3) {
        transform: translateY(-9px) rotate(-45deg);
    }
    
    .certificates-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-container {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
    
    .about-text-column,
    .about-skills-column,
    .contact-info,
    .contact-form-wrapper {
        padding: 24px;
    }
    
    .about-meta {
        grid-template-columns: 1fr;
        gap: 12px;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 2.2rem;
    }
    
    .hero-content h2 {
        font-size: 1.3rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
    }
    
    .tech-sphere {
        width: 240px;
        height: 240px;
    }
    
    .sphere-core {
        width: 80px;
        height: 80px;
    }
}