/* ============================================
   DESIGN SYSTEM — Bikan Chowdhury Portfolio
   V2 — Enhanced Visibility & Animations
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
    --bg-primary: #060613;
    --bg-secondary: #0c0c24;
    --bg-card: rgba(12, 12, 36, 0.85);
    --bg-glass: rgba(12, 12, 36, 0.7);

    --text-primary: #ffffff;
    --text-secondary: #c8c8e0;
    --text-muted: #8888aa;

    --accent-cyan: #00f5ff;
    --accent-purple: #a78bfa;
    --accent-magenta: #f472b6;
    --accent-blue: #60a5fa;

    --gradient-primary: linear-gradient(135deg, #00f5ff, #8b5cf6);
    --gradient-secondary: linear-gradient(135deg, #8b5cf6, #ec4899);
    --gradient-glow: linear-gradient(135deg, rgba(0,245,255,0.15), rgba(139,92,246,0.15));

    --border-color: rgba(255, 255, 255, 0.08);
    --border-glow: rgba(0, 245, 255, 0.25);

    --shadow-glow: 0 0 40px rgba(0, 245, 255, 0.15);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-text: 0 2px 20px rgba(0,0,0,0.5);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

    --nav-height: 80px;
    --container-width: 1200px;

    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-smooth: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    scrollbar-width: thin;
    scrollbar-color: var(--accent-purple) var(--bg-primary);
}

html::-webkit-scrollbar { width: 6px; }
html::-webkit-scrollbar-track { background: var(--bg-primary); }
html::-webkit-scrollbar-thumb { background: var(--accent-purple); border-radius: 3px; }

body {
    font-family: var(--font-family);
    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;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* --- Canvas Background (pushed further back, dimmed) --- */
#bg-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    opacity: 0.45;
}

/* --- Custom Cursor --- */
.cursor {
    width: 8px;
    height: 8px;
    background: var(--accent-cyan);
    border-radius: 50%;
    position: fixed;
    pointer-events: none;
    z-index: 10000;
    transition: transform 0.1s ease;
    mix-blend-mode: difference;
}

.cursor-follower {
    width: 36px;
    height: 36px;
    border: 1.5px solid var(--accent-cyan);
    border-radius: 50%;
    position: fixed;
    pointer-events: none;
    z-index: 9999;
    transition: transform 0.3s ease, width 0.3s ease, height 0.3s ease;
    opacity: 0.5;
}

.cursor.hover { transform: scale(2.5); }
.cursor-follower.hover { width: 56px; height: 56px; opacity: 0.3; }

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

/* --- Utility --- */
.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.inline-link {
    color: var(--accent-cyan);
    position: relative;
    font-weight: 600;
}

.inline-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1.5px;
    background: var(--accent-cyan);
    transition: width var(--transition-base);
}

.inline-link:hover::after { width: 100%; }

/* --- Section Shared --- */
.section {
    position: relative;
    z-index: 1;
    padding: 120px 0;
}

/* Dark overlay behind every section for text readability */
.section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg,
        rgba(6, 6, 19, 0.5) 0%,
        rgba(6, 6, 19, 0.7) 50%,
        rgba(6, 6, 19, 0.5) 100%
    );
    backdrop-filter: blur(4px); /* Localized blur for depth */
    -webkit-backdrop-filter: blur(4px);
    z-index: -1;
    pointer-events: none;
}

.section-header {
    text-align: center;
    margin-bottom: 72px;
}

.section-tag {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--accent-cyan);
    letter-spacing: 2px;
    text-transform: uppercase;
    font-family: 'Courier New', monospace;
    display: block;
    margin-bottom: 16px;
    text-shadow: 0 0 20px rgba(0,245,255,0.4);
    animation: pulse-glow 3s ease-in-out infinite;
}

@keyframes pulse-glow {
    0%, 100% { text-shadow: 0 0 20px rgba(0,245,255,0.3); }
    50% { text-shadow: 0 0 30px rgba(0,245,255,0.6), 0 0 60px rgba(0,245,255,0.2); }
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 16px;
    text-shadow: var(--shadow-text);
}

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

.section-line::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 50%;
    height: 100%;
    background: rgba(255,255,255,0.4);
    animation: shimmer-line 2.5s ease-in-out infinite;
}

@keyframes shimmer-line {
    0% { left: -50%; }
    100% { left: 150%; }
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1.05rem;
    max-width: 500px;
    margin: 20px auto 0;
    line-height: 1.7;
    text-shadow: 0 1px 10px rgba(0,0,0,0.3);
}

/* ============================================
   NAVIGATION
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 40px;
    z-index: 1000;
    transition: all var(--transition-smooth);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(6, 6, 19, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    height: 70px;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 900;
    letter-spacing: -0.5px;
    transition: all var(--transition-base);
    color: var(--text-primary);
}

.logo-dot {
    color: var(--accent-cyan);
    font-weight: 900;
    font-size: 2rem;
    line-height: 0;
    animation: dot-pulse 2s ease-in-out infinite;
}

@keyframes dot-pulse {
    0%, 100% { color: var(--accent-cyan); }
    50% { color: var(--accent-magenta); }
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 8px;
}

.nav-link {
    padding: 8px 18px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    border-radius: 1px;
    transition: width var(--transition-base);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 20px;
}

.nav-cta {
    padding: 10px 24px;
    background: var(--gradient-primary);
    border-radius: var(--radius-xl);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--bg-primary);
    transition: all var(--transition-base);
    letter-spacing: 0.3px;
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 245, 255, 0.3);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 1001;
}

.hamburger span {
    width: 28px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-base);
}

.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 6px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -6px); }

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    z-index: 1;
    padding-top: var(--nav-height);
}

/* Strong gradient overlay for hero text readability */
.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg,
        rgba(6, 6, 19, 0.9) 0%,
        rgba(6, 6, 19, 0.6) 40%,
        rgba(6, 6, 19, 0.3) 70%,
        rgba(6, 6, 19, 0.1) 100%
    );
    z-index: -1;
    pointer-events: none;
}

.hero-content {
    max-width: 750px;
    padding: 0 40px;
    animation: fadeInUp 1s ease forwards;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 8px 20px;
    background: rgba(6, 6, 19, 0.8);
    border: 1px solid var(--border-glow);
    border-radius: var(--radius-xl);
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--accent-cyan);
    margin-bottom: 32px;
    backdrop-filter: blur(15px);
    animation: fadeInUp 1s 0.2s ease both, border-breathe 4s ease-in-out infinite;
}

@keyframes border-breathe {
    0%, 100% { border-color: rgba(0,245,255,0.25); box-shadow: 0 0 15px rgba(0,245,255,0.05); }
    50% { border-color: rgba(0,245,255,0.5); box-shadow: 0 0 25px rgba(0,245,255,0.1); }
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: #22c55e;
    border-radius: 50%;
    animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); box-shadow: 0 0 0 0 rgba(34,197,94,0.4); }
    50% { opacity: 0.7; transform: scale(1.3); box-shadow: 0 0 0 6px rgba(34,197,94,0); }
}

.hero-greeting {
    display: block;
    font-size: clamp(1rem, 2.5vw, 1.3rem);
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 8px;
    text-shadow: 0 2px 15px rgba(0,0,0,0.5);
}

.hero-title {
    display: block;
    font-size: clamp(3rem, 8vw, 5.5rem);
    font-weight: 900;
    line-height: 1.05;
    letter-spacing: -3px;
    color: #ffffff;
    text-shadow: 0 0 40px rgba(0,245,255,0.15), 0 4px 30px rgba(0,0,0,0.4);
}

.hero-subtitle {
    margin-top: 20px;
    font-size: clamp(1.1rem, 2.5vw, 1.4rem);
    font-weight: 600;
    color: var(--accent-cyan);
    min-height: 36px;
    animation: fadeInUp 1s 0.4s ease both;
    text-shadow: 0 0 30px rgba(0,245,255,0.3);
}

.typed-cursor {
    animation: blink 1s infinite;
    color: var(--accent-magenta);
    font-weight: 300;
}

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

.hero-description {
    margin-top: 24px;
    font-size: 1.08rem;
    color: var(--text-secondary);
    max-width: 560px;
    line-height: 1.8;
    animation: fadeInUp 1s 0.6s ease both;
    text-shadow: 0 1px 15px rgba(0,0,0,0.4);
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-top: 40px;
    flex-wrap: wrap;
    animation: fadeInUp 1s 0.8s ease both;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    border-radius: var(--radius-xl);
    font-size: 0.92rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
    font-family: var(--font-family);
    letter-spacing: 0.3px;
    position: relative;
    overflow: hidden;
}

/* Shimmer sweep on buttons */
.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 60%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
    transition: none;
    animation: btn-shimmer 3s ease-in-out infinite;
}

@keyframes btn-shimmer {
    0%, 100% { left: -100%; }
    50% { left: 150%; }
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--bg-primary);
}

.btn-primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 12px 40px rgba(0, 245, 255, 0.35);
}

.btn-outline {
    background: rgba(6, 6, 19, 0.6);
    color: var(--text-primary);
    border: 1.5px solid var(--border-glow);
    backdrop-filter: blur(10px);
}

.btn-outline:hover {
    border-color: var(--accent-cyan);
    background: rgba(0, 245, 255, 0.08);
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(0, 245, 255, 0.15);
}

/* --- Hero Stats --- */
.hero-stats {
    display: flex;
    align-items: center;
    gap: 32px;
    margin-top: 56px;
    padding-top: 32px;
    border-top: 1px solid var(--border-color);
    animation: fadeInUp 1s 1s ease both;
}

.stat-number {
    font-size: 2.2rem;
    font-weight: 900;
    color: #ffffff;
    text-shadow: 0 0 20px rgba(0,245,255,0.3);
}

.stat-plus {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-cyan);
    text-shadow: 0 0 15px rgba(0,245,255,0.4);
}

.stat-label {
    display: block;
    font-size: 0.82rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-top: 4px;
    letter-spacing: 0.5px;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--border-color);
}

/* --- Scroll Indicator --- */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    right: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    animation: fadeInUp 1s 1.2s ease both;
}

.scroll-indicator span {
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--text-muted);
    writing-mode: vertical-rl;
}

.scroll-line {
    width: 1px;
    height: 60px;
    background: var(--border-color);
    position: relative;
    overflow: hidden;
}

.scroll-line::after {
    content: '';
    position: absolute;
    top: -100%;
    left: 0;
    width: 100%;
    height: 50%;
    background: var(--accent-cyan);
    box-shadow: 0 0 8px var(--accent-cyan);
    animation: scroll-anim 2s ease-in-out infinite;
}

@keyframes scroll-anim {
    0% { top: -50%; }
    100% { top: 100%; }
}

/* ============================================
   ANIMATED CARD BORDER MIXIN
   Shared animated gradient border for all cards
   ============================================ */
@property --angle {
    syntax: '<angle>';
    initial-value: 0deg;
    inherits: false;
}

@keyframes rotate-border {
    to { --angle: 360deg; }
}

/* ============================================
   ABOUT SECTION
   ============================================ */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1.3fr;
    gap: 80px;
    align-items: center;
}

.about-image-wrapper {
    position: relative;
}

.about-image-frame {
    position: relative;
    width: 100%;
    aspect-ratio: 4/5;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.about-image-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(0, 245, 255, 0.1), rgba(139, 92, 246, 0.1));
    border: 2px solid var(--border-glow);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
    box-shadow: 0 0 40px rgba(0, 245, 255, 0.15);
}

.profile-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-smooth);
}

.about-image-frame:hover .profile-img {
    transform: scale(1.05);
}

.about-image-glow {
    position: absolute;
    inset: -5px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    opacity: 0.5;
    filter: blur(30px);
    z-index: -1;
    animation: glow-pulse-strong 5s ease-in-out infinite;
}

@keyframes glow-pulse-strong {
    0%, 100% { opacity: 0.4; filter: blur(30px); transform: scale(1); }
    50% { opacity: 0.7; filter: blur(45px); transform: scale(1.02); }
}

.placeholder-icon {
    font-size: 5rem;
}

.about-image-border {
    position: absolute;
    inset: 0;
    border: 1px solid var(--border-glow);
    border-radius: var(--radius-lg);
    pointer-events: none;
}

.about-floating-card {
    position: absolute;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 20px;
    background: rgba(6, 6, 19, 0.9);
    backdrop-filter: blur(15px);
    border: 1px solid var(--border-glow);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-cyan);
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.about-floating-card svg { stroke: var(--accent-cyan); }

.card-1 {
    top: 20px;
    right: -20px;
    animation: float-card-1 5s ease-in-out infinite;
}

.card-2 {
    bottom: 30px;
    left: -20px;
    animation: float-card-2 6s ease-in-out infinite;
}

@keyframes float-card-1 {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    25% { transform: translateY(-12px) rotate(2deg); }
    75% { transform: translateY(6px) rotate(-1deg); }
}

@keyframes float-card-2 {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    33% { transform: translateY(-8px) rotate(-2deg); }
    66% { transform: translateY(10px) rotate(1deg); }
}

.about-heading {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 24px;
    text-shadow: var(--shadow-text);
}

.about-text {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 16px;
    line-height: 1.8;
}

.about-text strong {
    color: #ffffff;
    font-weight: 700;
}

.about-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin: 32px 0;
    padding: 24px;
    background: rgba(6, 6, 19, 0.8);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    backdrop-filter: blur(15px);
    position: relative;
    overflow: hidden;
}

/* Animated gradient sweep on details card */
.about-details::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 40%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0,245,255,0.03), transparent);
    animation: sweep 4s ease-in-out infinite;
}

@keyframes sweep {
    0% { left: -40%; }
    100% { left: 140%; }
}

.detail-label {
    display: block;
    font-size: 0.75rem;
    color: var(--accent-cyan);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 4px;
    font-weight: 600;
}

.detail-value {
    font-size: 0.92rem;
    font-weight: 600;
    color: #ffffff;
}

/* ============================================
   SKILLS SECTION
   ============================================ */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.skill-card {
    position: relative;
    padding: 36px 28px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-smooth);
    cursor: default;
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    animation: card-float-idle 6s ease-in-out infinite;
    animation-delay: calc(var(--i, 0) * 0.5s);
}

.skills-grid .skill-card:nth-child(1) { --i: 0; }
.skills-grid .skill-card:nth-child(2) { --i: 1; }
.skills-grid .skill-card:nth-child(3) { --i: 2; }
.skills-grid .skill-card:nth-child(4) { --i: 3; }
.skills-grid .skill-card:nth-child(5) { --i: 4; }
.skills-grid .skill-card:nth-child(6) { --i: 5; }

@keyframes card-float-idle {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-6px); }
}

.skill-card:hover {
    border-color: var(--accent-cyan);
    transform: translateY(-10px) !important;
    box-shadow:
        0 25px 60px rgba(0,0,0,0.5),
        0 0 40px rgba(0,245,255,0.15),
        inset 0 1px 0 rgba(255,255,255,0.1);
}

.skill-card-glow {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(0,245,255,0.06) 0%, transparent 60%);
    opacity: 0;
    transition: opacity var(--transition-smooth);
    pointer-events: none;
}

.skill-card:hover .skill-card-glow { opacity: 1; }

/* Animated top border on hover */
.skill-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.skill-card:hover::after {
    transform: scaleX(1);
}

.skill-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 245, 255, 0.06);
    border: 1px solid rgba(0, 245, 255, 0.12);
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    transition: all var(--transition-smooth);
}

.skill-card:hover .skill-icon {
    background: rgba(0, 245, 255, 0.12);
    border-color: rgba(0, 245, 255, 0.3);
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 0 20px rgba(0,245,255,0.1);
}

.skill-name {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: #ffffff;
}

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

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 20px;
}

.tag {
    padding: 5px 14px;
    background: rgba(139, 92, 246, 0.1);
    border: 1px solid rgba(139, 92, 246, 0.2);
    border-radius: var(--radius-xl);
    font-size: 0.73rem;
    font-weight: 600;
    color: var(--accent-purple);
    letter-spacing: 0.3px;
    transition: all var(--transition-base);
}

.skill-card:hover .tag,
.project-card:hover .tag {
    border-color: rgba(139, 92, 246, 0.4);
    background: rgba(139, 92, 246, 0.15);
}

.skill-bar {
    height: 3px;
    background: rgba(255, 255, 255, 0.06);
    border-radius: 2px;
    overflow: hidden;
}

.skill-bar-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 2px;
    width: 0%;
    transition: width 1.5s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.skill-bar-fill::after {
    content: '';
    position: absolute;
    right: 0;
    top: -2px;
    width: 7px;
    height: 7px;
    background: var(--accent-cyan);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--accent-cyan);
    opacity: 0;
    transition: opacity 0.3s ease 1.5s;
}

.skill-bar-fill[style*="width"]::after {
    opacity: 1;
}

/* ============================================
   PROJECTS SECTION
   ============================================ */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.project-card {
    position: relative;
    padding: 40px 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-smooth);
    cursor: default;
    backdrop-filter: blur(12px);
    animation: card-float-idle 7s ease-in-out infinite;
}

.projects-grid .project-card:nth-child(1) { animation-delay: 0s; }
.projects-grid .project-card:nth-child(2) { animation-delay: 1s; }
.projects-grid .project-card:nth-child(3) { animation-delay: 2s; }

.project-card:hover {
    border-color: var(--accent-cyan);
    transform: translateY(-12px) !important;
    box-shadow:
        0 25px 60px rgba(0, 0, 0, 0.4),
        0 0 40px rgba(0,245,255,0.08);
}

.project-card.featured {
    border-color: rgba(0, 245, 255, 0.2);
    background: rgba(12, 12, 36, 0.9);
}

/* Animated corner accents on featured card */
.project-card.featured::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 60px;
    height: 60px;
    border-top: 2px solid var(--accent-cyan);
    border-left: 2px solid var(--accent-cyan);
    border-radius: var(--radius-lg) 0 0 0;
    opacity: 0.5;
    animation: corner-pulse 3s ease-in-out infinite;
}

.project-card.featured::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    width: 60px;
    height: 60px;
    border-bottom: 2px solid var(--accent-purple);
    border-right: 2px solid var(--accent-purple);
    border-radius: 0 0 var(--radius-lg) 0;
    opacity: 0.5;
    animation: corner-pulse 3s ease-in-out infinite 1.5s;
}

@keyframes corner-pulse {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 0.7; }
}

.project-card-bg {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at top right, rgba(0,245,255,0.04) 0%, transparent 60%);
    pointer-events: none;
    transition: all var(--transition-smooth);
}

.project-card:hover .project-card-bg {
    background: radial-gradient(ellipse at top right, rgba(0,245,255,0.08) 0%, transparent 60%);
}

.project-number {
    font-size: 4rem;
    font-weight: 900;
    color: rgba(255, 255, 255, 0.03);
    line-height: 1;
    margin-bottom: -10px;
    transition: all var(--transition-smooth);
}

.project-card:hover .project-number {
    color: rgba(0, 245, 255, 0.06);
}

.project-label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.project-type {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--accent-cyan);
    letter-spacing: 0.5px;
}

.project-year {
    font-size: 0.78rem;
    color: var(--text-muted);
    font-weight: 500;
}

.project-title {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 12px;
    letter-spacing: -0.5px;
    color: #ffffff;
    transition: all var(--transition-base);
}

.project-card:hover .project-title {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.project-desc {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 24px;
}

.project-links {
    display: flex;
    gap: 16px;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 600;
    transition: all var(--transition-base);
    padding: 8px 18px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    position: relative;
    overflow: hidden;
}

.project-link::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0,245,255,0.08), transparent);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.project-link:hover::before { opacity: 1; }

.project-link:hover {
    color: var(--accent-cyan);
    border-color: var(--border-glow);
    transform: translateY(-2px);
}

/* ============================================
   EDUCATION SECTION
   ============================================ */
.timeline {
    position: relative;
    max-width: 700px;
    margin: 0 auto;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent-cyan), var(--accent-purple), transparent);
}

/* Animated particle traveling the timeline */
.timeline::after {
    content: '';
    position: absolute;
    left: -3px;
    top: 0;
    width: 8px;
    height: 8px;
    background: var(--accent-cyan);
    border-radius: 50%;
    box-shadow: 0 0 15px var(--accent-cyan);
    animation: travel-timeline 4s ease-in-out infinite;
}

@keyframes travel-timeline {
    0% { top: 0; opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { top: 100%; opacity: 0; }
}

.timeline-item {
    position: relative;
    margin-bottom: 48px;
}

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

.timeline-dot {
    position: absolute;
    left: -46px;
    top: 24px;
    width: 12px;
    height: 12px;
    background: var(--accent-cyan);
    border-radius: 50%;
    box-shadow: 0 0 20px rgba(0, 245, 255, 0.5);
    animation: dot-glow 3s ease-in-out infinite;
}

@keyframes dot-glow {
    0%, 100% { box-shadow: 0 0 15px rgba(0,245,255,0.3); }
    50% { box-shadow: 0 0 25px rgba(0,245,255,0.6), 0 0 50px rgba(0,245,255,0.2); }
}

.timeline-dot::after {
    content: '';
    position: absolute;
    inset: -4px;
    border: 2px solid rgba(0, 245, 255, 0.2);
    border-radius: 50%;
    animation: ring-expand 3s ease-in-out infinite;
}

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

.timeline-card {
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all var(--transition-smooth);
    backdrop-filter: blur(12px);
    position: relative;
    overflow: hidden;
}

/* Left accent bar that animates on hover */
.timeline-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.timeline-card:hover::before { opacity: 1; }

.timeline-card:hover {
    border-color: var(--border-glow);
    box-shadow: 0 15px 40px rgba(0,0,0,0.3), var(--shadow-glow);
    transform: translateX(8px);
}

.timeline-date {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--accent-cyan);
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.timeline-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 6px;
    color: #ffffff;
}

.timeline-place {
    font-size: 0.9rem;
    color: var(--accent-purple);
    font-weight: 600;
    margin-bottom: 12px;
}

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

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 64px;
    align-items: start;
}

.contact-card {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    transition: all var(--transition-smooth);
    backdrop-filter: blur(12px);
    position: relative;
    overflow: hidden;
}

.contact-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0,245,255,0.03), transparent);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.contact-card:hover::before { opacity: 1; }

.contact-card:hover {
    border-color: var(--border-glow);
    transform: translateX(6px);
    box-shadow: -4px 0 20px rgba(0,245,255,0.05);
}

.contact-card-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 245, 255, 0.06);
    border: 1px solid rgba(0,245,255,0.12);
    border-radius: var(--radius-sm);
    color: var(--accent-cyan);
    flex-shrink: 0;
    transition: all var(--transition-base);
}

.contact-card:hover .contact-card-icon {
    background: rgba(0, 245, 255, 0.12);
    transform: rotate(8deg) scale(1.05);
}

.contact-card-label {
    display: block;
    font-size: 0.75rem;
    color: var(--accent-cyan);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 4px;
    font-weight: 600;
}

.contact-card-value {
    font-size: 0.92rem;
    font-weight: 600;
    color: #ffffff;
    word-break: break-all;
}

a.contact-card-value:hover { color: var(--accent-cyan); }

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

.social-link {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    transition: all var(--transition-spring);
    position: relative;
    overflow: hidden;
}

.social-link::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.social-link:hover::before { opacity: 0.1; }

.social-link:hover {
    color: var(--accent-cyan);
    border-color: var(--border-glow);
    transform: translateY(-6px) rotate(5deg);
    box-shadow: 0 8px 20px rgba(0,245,255,0.1);
}

.social-link svg {
    position: relative;
    z-index: 1;
}

/* --- Contact Form --- */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.form-group {
    position: relative;
}

.form-input {
    width: 100%;
    padding: 16px 0;
    background: transparent;
    border: none;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    color: #ffffff;
    font-family: var(--font-family);
    font-size: 0.95rem;
    font-weight: 500;
    outline: none;
    transition: border-color var(--transition-base);
}

.form-input:focus { border-bottom-color: var(--accent-cyan); }

.form-label {
    position: absolute;
    left: 0;
    top: 16px;
    font-size: 0.9rem;
    color: var(--text-muted);
    pointer-events: none;
    transition: all var(--transition-base);
    font-weight: 500;
}

.form-input:focus ~ .form-label,
.form-input:not(:placeholder-shown) ~ .form-label {
    top: -8px;
    font-size: 0.72rem;
    color: var(--accent-cyan);
    letter-spacing: 1px;
}

.form-line {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-smooth);
    box-shadow: 0 0 10px rgba(0,245,255,0.3);
}

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

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

.btn-submit {
    width: fit-content;
    margin-top: 8px;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    position: relative;
    z-index: 1;
    padding: 60px 0 0;
    border-top: 1px solid var(--border-color);
}

.footer::before {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(6, 6, 19, 0.85);
    z-index: -1;
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 32px;
}

.footer-logo {
    font-size: 1.4rem;
    font-weight: 900;
    color: var(--text-primary);
}

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

.footer-socials {
    display: flex;
    gap: 16px;
}

.footer-socials a {
    color: var(--text-muted);
    transition: all var(--transition-spring);
}

.footer-socials a:hover {
    color: var(--accent-cyan);
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding: 24px 0;
    border-top: 1px solid var(--border-color);
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(40px); }
    to { opacity: 1; transform: translateY(0); }
}

/* --- Reveal Animations --- */
.reveal-up,
.reveal-left,
.reveal-right {
    opacity: 0;
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal-up { transform: translateY(60px); }
.reveal-left { transform: translateX(-60px); }
.reveal-right { transform: translateX(60px); }

.reveal-up.revealed,
.reveal-left.revealed,
.reveal-right.revealed {
    opacity: 1;
    transform: translate(0);
}

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

/* Tablet */
@media (max-width: 1024px) {
    .skills-grid { grid-template-columns: repeat(2, 1fr); }
    .projects-grid { grid-template-columns: repeat(2, 1fr); }
    .projects-grid .project-card:first-child { grid-column: span 2; }
    .about-grid { gap: 48px; }
    .contact-grid { gap: 40px; }
}

/* Mobile */
@media (max-width: 768px) {
    .cursor, .cursor-follower { display: none; }

    .navbar { padding: 0 20px; }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background: rgba(6, 6, 19, 0.97);
        backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 16px;
        transition: right var(--transition-smooth);
        border-left: 1px solid var(--border-color);
    }

    .nav-links.active { right: 0; }
    .nav-link { font-size: 1.1rem; padding: 12px 24px; }
    .nav-cta { display: none; }
    .hamburger { display: flex; }

    .hero-content { padding: 0 20px; }
    .hero-title { letter-spacing: -1.5px; }
    .hero-stats { gap: 20px; }
    .stat-number { font-size: 1.6rem; }
    .scroll-indicator { display: none; }

    .about-grid { grid-template-columns: 1fr; gap: 40px; }
    .about-image-frame { max-width: 280px; margin: 0 auto; }
    .card-1 { right: 0; }
    .card-2 { left: 0; }

    .skills-grid { grid-template-columns: 1fr; }
    .projects-grid { grid-template-columns: 1fr; }
    .projects-grid .project-card:first-child { grid-column: span 1; }
    .contact-grid { grid-template-columns: 1fr; }

    .section { padding: 80px 0; }
    .section-header { margin-bottom: 48px; }

    .footer-content { flex-direction: column; gap: 16px; text-align: center; }

    .timeline { padding-left: 30px; }
    .timeline-dot { left: -36px; }
    .timeline-card { padding: 24px; }

    /* Disable float animations on mobile for performance */
    .skill-card, .project-card {
        animation: none !important;
    }
}

@media (max-width: 480px) {
    .hero-stats { flex-wrap: wrap; gap: 16px; }
    .stat-divider { display: none; }
    .hero-actions { flex-direction: column; }
    .btn { width: 100%; justify-content: center; }
    .about-details { grid-template-columns: 1fr; }
}