:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #111118;
    --bg-card: #1a1a24;
    --royal-blue: #1d4ed8;
    --royal-blue-dark: #1e3a8a;
    --royal-blue-light: #3b82f6;
    --accent: #60a5fa;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: #1e293b;
    --gradient-1: linear-gradient(135deg, #1d4ed8 0%, #60a5fa 100%);
    --gradient-hero: linear-gradient(135deg, #0a0a0f 0%, #111118 50%, #0f172a 100%);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
}

::selection {
    background: var(--royal-blue);
    color: #fff;
}

section[id] {
    scroll-margin-top: 80px;
}

/* BACK TO TOP */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, #1d4ed8, #3b82f6);
    color: #fff;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s;
    z-index: 999;
}
.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.back-to-top:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(29,78,216,0.3);
}

/* NAVBAR */
.navbar {
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 0;
    transition: all 0.3s;
}

.navbar.scrolled {
    box-shadow: 0 4px 30px rgba(29, 78, 216, 0.1);
}

.navbar-brand {
    font-weight: 800;
    font-size: 1.5rem;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.navbar-brand:hover {
    color: var(--royal-blue-light);
}

.navbar-brand .brand-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient-1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    font-size: 1.2rem;
    color: #fff;
}

.nav-link {
    color: var(--text-secondary) !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    border-radius: 8px;
    transition: all 0.3s;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: #fff !important;
    background: rgba(29, 78, 216, 0.15);
}

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

.navbar-toggler {
    border: 1px solid var(--border-color);
    padding: 0.5rem;
}

.navbar-toggler:focus {
    box-shadow: none;
}

.navbar-toggler-icon {
    filter: invert(1);
}

/* HERO */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    background: var(--gradient-hero);
    padding-top: 80px;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(29, 78, 216, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(96, 165, 250, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    padding: 0.4rem 1rem;
    background: rgba(29, 78, 216, 0.15);
    border: 1px solid rgba(29, 78, 216, 0.3);
    border-radius: 50px;
    font-size: 0.85rem;
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 1.5rem;
    letter-spacing: 0.5px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 900;
    line-height: 1.15;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #f1f5f9 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    line-height: 1.8;
    margin-bottom: 2rem;
}

.hero-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.9rem 2rem;
    background: var(--gradient-1);
    color: #fff;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s;
    box-shadow: 0 4px 20px rgba(29, 78, 216, 0.3);
}

.hero-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(29, 78, 216, 0.4);
    color: #fff;
}

.hero-btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.9rem 2rem;
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s;
    margin-left: 1rem;
}

.hero-btn-outline:hover {
    border-color: var(--royal-blue);
    color: var(--accent);
}

.hero-stats {
    display: flex;
    gap: 3rem;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.hero-stat-number {
    font-size: 1.8rem;
    font-weight: 800;
    color: #fff;
}

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

.bg-secondary-section {
    background: var(--bg-secondary);
}

/* SECTIONS */
.section {
    padding: 5rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 3.5rem;
}

.section-tag {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    background: rgba(29, 78, 216, 0.12);
    border: 1px solid rgba(29, 78, 216, 0.25);
    border-radius: 50px;
    font-size: 0.8rem;
    color: var(--accent);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 1rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.section-desc {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* SKILLS CARDS */
.skill-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    transition: all 0.4s;
    height: 100%;
    position: relative;
    overflow: hidden;
}

.skill-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-1);
    transform: scaleX(0);
    transition: transform 0.4s;
    transform-origin: left;
}

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

.skill-card:hover {
    transform: translateY(-8px);
    border-color: rgba(29, 78, 216, 0.3);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.skill-icon {
    width: 70px;
    height: 70px;
    background: rgba(29, 78, 216, 0.1);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2rem;
    color: var(--accent);
    transition: all 0.4s;
}

.skill-card:hover .skill-icon {
    background: var(--gradient-1);
    color: #fff;
    transform: scale(1.1);
}

.skill-card h5 {
    font-weight: 700;
    margin-bottom: 0.75rem;
    font-size: 1.15rem;
}

.skill-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0;
    line-height: 1.7;
}

/* PROJECT CARDS */
.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.4s;
    height: 100%;
}

.project-card:hover {
    transform: translateY(-8px);
    border-color: rgba(29, 78, 216, 0.3);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.project-img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-card) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-color);
}

.project-img-placeholder {
    width: 100%;
    height: 220px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: var(--accent);
    font-size: 3rem;
    border-bottom: 1px solid var(--border-color);
}

.project-body {
    padding: 1.5rem;
}

.project-body h5 {
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.project-body p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
    line-height: 1.7;
}
.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.4rem 1rem;
    background: linear-gradient(135deg, #1d4ed8, #3b82f6);
    color: #fff;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s;
}
.project-link:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(29,78,216,0.3);
    color: #fff;
}

/* FOOTER */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 3rem 0 2rem;
}

.footer-brand {
    font-size: 1.3rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 0.5rem;
}

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

.footer-title {
    font-weight: 700;
    margin-bottom: 1rem;
    color: #fff;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.3s;
    font-size: 0.9rem;
}

.footer-links a:hover {
    color: var(--accent);
}

.footer-social a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-secondary);
    font-size: 1.2rem;
    text-decoration: none;
    transition: all 0.3s;
    margin-right: 0.5rem;
}

.footer-social a:hover {
    background: var(--royal-blue);
    border-color: var(--royal-blue);
    color: #fff;
    transform: translateY(-3px);
}

.footer-bottom {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* RESPONSIVE */
@media (max-width: 991px) {
    .hero-title {
        font-size: 2.5rem;
    }
    .hero-stats {
        gap: 2rem;
    }
    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 767px) {
    .hero {
        text-align: center;
    }
    .hero-title {
        font-size: 2rem;
    }
    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }
    .hero-buttons {
        justify-content: center;
    }
    .hero-btn-outline {
        margin-left: 0;
        margin-top: 0.75rem;
    }
    .hero-stats {
        justify-content: center;
        gap: 1.5rem;
        flex-wrap: wrap;
    }
    .hero-stat-number {
        font-size: 1.4rem;
    }
    .section {
        padding: 3rem 0;
    }
    .section-title {
        font-size: 1.7rem;
    }
    .footer-social {
        margin-top: 1rem;
    }
    .hero-btn-outline {
        margin-left: 0;
    }
}

@media (max-width: 575px) {
    .hero-title {
        font-size: 1.7rem;
    }
    .hero-stats {
        flex-direction: column;
        gap: 1rem;
        align-items: center;
    }
}