/* ===== Design Tokens ===== */
:root {
    --primary: #7c3aed;
    --primary-light: #a78bfa;
    --accent: #06b6d4;
    --accent-light: #67e8f9;
    --pink: #ec4899;
    --bg-dark: #030014;
    --glass: rgba(255, 255, 255, 0.04);
    --glass-strong: rgba(255, 255, 255, 0.08);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-border-hover: rgba(124, 58, 237, 0.4);
    --text-main: #f1f5f9;
    --text-secondary: #c4b5fd;
    --text-dim: #94a3b8;
    --radius-sm: 1rem;
    --radius-md: 1.5rem;
    --radius-lg: 2rem;
    --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Reset ===== */
* { margin: 0; padding: 0; box-sizing: border-box; scroll-behavior: smooth; }

body {
    font-family: 'Plus Jakarta Sans', sans-serif;
    background: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.7;
    overflow-x: hidden;
    min-height: 100vh;
}

/* ===== Animated Background ===== */
body::before {
    content: '';
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: -1;
    background:
        radial-gradient(ellipse 600px 600px at 15% 20%, rgba(124, 58, 237, 0.15) 0%, transparent 70%),
        radial-gradient(ellipse 500px 500px at 85% 30%, rgba(6, 182, 212, 0.1) 0%, transparent 70%),
        radial-gradient(ellipse 400px 400px at 50% 80%, rgba(236, 72, 153, 0.08) 0%, transparent 70%),
        radial-gradient(ellipse 800px 800px at 50% 50%, rgba(124, 58, 237, 0.03) 0%, transparent 70%);
    animation: bgShift 20s ease-in-out infinite alternate;
}

@keyframes bgShift {
    0%   { filter: hue-rotate(0deg); }
    100% { filter: hue-rotate(30deg); }
}

/* Floating Orb Decorations */
body::after {
    content: '';
    position: fixed;
    width: 300px; height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(124, 58, 237, 0.12), transparent 70%);
    top: 60%; right: -100px;
    z-index: -1;
    animation: floatOrb 15s ease-in-out infinite alternate;
    pointer-events: none;
}

@keyframes floatOrb {
    0%   { transform: translate(0, 0) scale(1); }
    50%  { transform: translate(-50px, -80px) scale(1.2); }
    100% { transform: translate(20px, -40px) scale(0.9); }
}

/* ===== Glass Mixin Pattern ===== */
.glass {
    background: var(--glass);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

/* ===== Navigation ===== */
nav {
    position: fixed;
    width: 100%;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    background: rgba(3, 0, 20, 0.5);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-bottom: 1px solid var(--glass-border);
    transition: var(--transition);
}

nav.scrolled {
    padding: 0.65rem 2rem;
    background: rgba(3, 0, 20, 0.8);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.logo {
    font-weight: 800;
    font-size: 1.4rem;
    letter-spacing: 2px;
    background: linear-gradient(135deg, var(--primary-light), var(--accent-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 0.5rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-dim);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    padding: 0.5rem 1rem;
    border-radius: 0.6rem;
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.06);
}

.nav-links a.active {
    color: #fff;
    background: rgba(124, 58, 237, 0.2);
    border: 1px solid rgba(124, 58, 237, 0.3);
}

/* Hamburger */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
    z-index: 1001;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background: var(--text-main);
    transition: var(--transition);
    border-radius: 2px;
}

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

/* ===== Container ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* ===== Sections ===== */
section {
    padding: 6rem 0 3rem;
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.9s cubic-bezier(0.4, 0, 0.2, 1);
}

section.visible { opacity: 1; transform: translateY(0); }

.section-title {
    font-size: 2.8rem;
    margin-bottom: 0.5rem;
    letter-spacing: -1.5px;
    font-weight: 800;
}

.section-title span {
    background: linear-gradient(135deg, var(--primary-light), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    color: var(--text-dim);
    font-size: 1rem;
    margin-bottom: 2.5rem;
}

/* ===== Hero ===== */
#profile { padding-top: 8rem; }

.hero-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 3rem;
    align-items: start;
}

.badge-main {
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.15), rgba(6, 182, 212, 0.1));
    color: var(--primary-light);
    padding: 0.5rem 1.2rem;
    border-radius: var(--radius-lg);
    font-weight: 700;
    font-size: 0.7rem;
    display: inline-block;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    border: 1px solid rgba(124, 58, 237, 0.2);
    backdrop-filter: blur(10px);
}

.hero-content h1 {
    font-size: 4.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    letter-spacing: -2px;
    background: linear-gradient(135deg, #fff 0%, var(--primary-light) 50%, var(--accent-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-content p {
    font-size: 1.15rem;
    color: var(--text-dim);
    margin-bottom: 2rem;
    max-width: 600px;
    line-height: 1.8;
}

.hero-content p strong {
    color: var(--text-secondary);
}

/* Hero Buttons */
.hero-actions {
    display: flex;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    background: linear-gradient(135deg, var(--primary), #9333ea);
    color: #fff;
    padding: 0.85rem 1.8rem;
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-weight: 700;
    font-size: 0.9rem;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 20px rgba(124, 58, 237, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 35px rgba(124, 58, 237, 0.5);
}

.btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    background: var(--glass);
    color: var(--text-main);
    padding: 0.85rem 1.8rem;
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-weight: 700;
    font-size: 0.9rem;
    border: 1px solid var(--glass-border);
    transition: var(--transition);
    cursor: pointer;
    backdrop-filter: blur(10px);
}

.btn-outline:hover {
    border-color: var(--glass-border-hover);
    background: rgba(124, 58, 237, 0.1);
    transform: translateY(-3px);
}

/* Education Cards */
.edu-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-top: 2rem;
}

.edu-card {
    background: var(--glass);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: var(--transition);
}

.edu-card:hover {
    border-color: var(--glass-border-hover);
    background: var(--glass-strong);
    transform: translateY(-3px);
    box-shadow: 0 8px 32px rgba(124, 58, 237, 0.1);
}

.edu-card h4 {
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.edu-card small {
    color: var(--text-dim);
}

/* ===== Sidebar Cards ===== */
.sidebar-card {
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 2rem;
    margin-bottom: 2rem;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: var(--transition);
}

.sidebar-card:hover {
    border-color: var(--glass-border-hover);
    box-shadow: 0 8px 32px rgba(124, 58, 237, 0.08);
}

.sidebar-card h3 {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--text-main), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    color: var(--text-dim);
    font-size: 0.95rem;
}

.contact-item i {
    color: var(--primary-light);
    width: 18px;
    text-align: center;
}

/* ===== Skill Tags ===== */
.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.tag {
    background: var(--glass);
    border: 1px solid var(--glass-border);
    padding: 0.55rem 1.1rem;
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
    transition: var(--transition);
    cursor: default;
    backdrop-filter: blur(10px);
    color: var(--text-secondary);
}

.tag:hover {
    border-color: var(--glass-border-hover);
    background: rgba(124, 58, 237, 0.1);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(124, 58, 237, 0.1);
}

.tag[data-cat="ai"]    { border-left: 3px solid var(--primary-light); }
.tag[data-cat="cyber"] { border-left: 3px solid var(--pink); }
.tag[data-cat="data"]  { border-left: 3px solid #34d399; }
.tag[data-cat="code"]  { border-left: 3px solid #fbbf24; }

/* ===== Item Grid ===== */
.item-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

/* ===== Glass Cards ===== */
.project-card,
.ach-card {
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 2rem;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.project-card::before,
.ach-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.05), rgba(6, 182, 212, 0.03));
    opacity: 0;
    transition: var(--transition);
    pointer-events: none;
}

.project-card::after,
.ach-card::after {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent), var(--pink));
    opacity: 0;
    transition: var(--transition);
}

.project-card:hover,
.ach-card:hover {
    border-color: var(--glass-border-hover);
    transform: translateY(-6px);
    box-shadow:
        0 20px 50px rgba(0, 0, 0, 0.4),
        0 0 40px rgba(124, 58, 237, 0.06);
}

.project-card:hover::before,
.ach-card:hover::before,
.project-card:hover::after,
.ach-card:hover::after {
    opacity: 1;
}

.card-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.card-desc {
    color: var(--text-dim);
    margin: 0.75rem 0 1.25rem;
    font-size: 0.93rem;
    line-height: 1.7;
}

.card-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
}

.tech-tag {
    background: rgba(124, 58, 237, 0.12);
    color: var(--primary-light);
    padding: 0.3rem 0.75rem;
    border-radius: 0.5rem;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    border: 1px solid rgba(124, 58, 237, 0.15);
}

.card-link {
    color: var(--primary-light);
    text-decoration: none;
    font-weight: 700;
    font-size: 0.88rem;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    transition: var(--transition);
}

.card-link:hover {
    color: var(--accent-light);
    gap: 0.7rem;
}

/* Achievement icon */
.card-icon {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.12), rgba(124, 58, 237, 0.08));
    color: var(--accent);
    border: 1px solid rgba(6, 182, 212, 0.15);
}

.card-badge {
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 0.5rem;
    display: block;
}

/* ===== Poetry Section ===== */
.poetry-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.poetry-card {
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 2.5rem;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.poetry-card::before {
    content: '"';
    position: absolute;
    top: -15px; right: 20px;
    font-size: 9rem;
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.08), rgba(236, 72, 153, 0.05));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-family: Georgia, serif;
    line-height: 1;
    pointer-events: none;
}

.poetry-card:hover {
    border-color: var(--glass-border-hover);
    transform: translateY(-6px);
    box-shadow:
        0 20px 50px rgba(0, 0, 0, 0.4),
        0 0 40px rgba(124, 58, 237, 0.06);
}

.poetry-card h3 {
    font-size: 1.3rem;
    margin-bottom: 0.75rem;
    font-style: italic;
    background: linear-gradient(135deg, var(--text-main), var(--pink));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.poetry-excerpt {
    color: var(--text-dim);
    font-size: 1rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    font-style: italic;
}

/* ===== Social Grid ===== */
.social-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.social-card {
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 2rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
    text-decoration: none;
    color: var(--text-main);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: var(--transition);
}

.social-card:hover {
    transform: translateY(-6px);
    border-color: var(--glass-border-hover);
    box-shadow:
        0 20px 50px rgba(0, 0, 0, 0.4),
        0 0 35px rgba(124, 58, 237, 0.06);
}

.social-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.12), rgba(124, 58, 237, 0.08));
    color: var(--accent);
    border: 1px solid rgba(6, 182, 212, 0.12);
    transition: var(--transition);
}

.social-card:hover .social-icon {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    border-color: transparent;
    box-shadow: 0 4px 20px rgba(124, 58, 237, 0.3);
}

.social-card span {
    font-size: 1.1rem;
    font-weight: 600;
}

.social-card small {
    display: block;
    color: var(--text-dim);
    font-size: 0.8rem;
    margin-top: 0.2rem;
}

/* ===== Footer ===== */
footer {
    border-top: 1px solid var(--glass-border);
    padding: 2.5rem 2rem;
    text-align: center;
    color: var(--text-dim);
    font-size: 0.85rem;
    margin-top: 2rem;
    background: rgba(3, 0, 20, 0.3);
    backdrop-filter: blur(10px);
}

footer p {
    max-width: 500px;
    margin: 0 auto;
}

.footer-heart { color: var(--pink); }

/* ===== Skeleton Loading ===== */
.skeleton-card {
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 2rem;
    backdrop-filter: blur(10px);
    animation: pulse 1.8s ease-in-out infinite;
}

.skeleton-line {
    height: 14px;
    background: rgba(255, 255, 255, 0.04);
    border-radius: 8px;
    margin-bottom: 0.75rem;
}

.skeleton-line.short  { width: 40%; }
.skeleton-line.medium { width: 70%; }
.skeleton-line.long   { width: 100%; }

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50%      { opacity: 0.4; }
}

/* Error */
.error-state {
    text-align: center;
    padding: 3rem;
    color: var(--text-dim);
}

.error-state i {
    font-size: 2.5rem;
    color: #f87171;
    margin-bottom: 1rem;
    display: block;
}

/* ===== Scroll to Top ===== */
.scroll-top {
    position: fixed;
    bottom: 2rem; right: 2rem;
    width: 46px; height: 46px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), #9333ea);
    color: #fff;
    border: 1px solid rgba(124, 58, 237, 0.3);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 999;
    box-shadow: 0 4px 25px rgba(124, 58, 237, 0.4);
    backdrop-filter: blur(10px);
}

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

.scroll-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 35px rgba(124, 58, 237, 0.6);
}

/* ===== Responsive: Tablet ===== */
@media (max-width: 968px) {
    .hero-grid { grid-template-columns: 1fr; }
    .hero-content h1 { font-size: 3rem; }

    .nav-links {
        position: fixed;
        top: 0; right: -100%;
        width: 280px; height: 100vh;
        background: rgba(3, 0, 20, 0.95);
        backdrop-filter: blur(30px);
        -webkit-backdrop-filter: blur(30px);
        flex-direction: column;
        justify-content: center;
        gap: 1rem;
        transition: var(--transition);
        border-left: 1px solid var(--glass-border);
    }

    .nav-links.open { right: 0; }
    .hamburger { display: flex; }
}

@media (max-width: 768px) {
    .edu-row { grid-template-columns: 1fr; }
    .section-title { font-size: 2rem; }
    .item-grid { grid-template-columns: 1fr; }
    .poetry-grid { grid-template-columns: 1fr; }

    .hero-actions { flex-direction: column; }
    .hero-actions .btn-primary,
    .hero-actions .btn-outline {
        text-align: center;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container { padding: 0 1rem; }
    .hero-content h1 { font-size: 2.4rem; letter-spacing: -1px; }
    .hero-content p { font-size: 1rem; }
    nav { padding: 0.8rem 1rem; }
    .social-grid { grid-template-columns: 1fr; }
    .section-title { font-size: 1.7rem; }
}