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

body {
    background-color: #F4F7FC;
    color: #1A2C3E;
    font-family: 'Inter', sans-serif;
    line-height: 1.5;
    scroll-behavior: smooth;
}

a {
    text-decoration: none;
}

::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: #E2E8F0;
}
::-webkit-scrollbar-thumb {
    background: #0D6EFD;
    border-radius: 8px;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    flex-wrap: wrap;
    gap: 16px;
    border-bottom: 1px solid #DCE5F0;
}
.logo {
    font-size: 1.8rem;
    font-weight: 700;
    background: linear-gradient(135deg, #1A2C3E 0%, #0D6EFD 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    letter-spacing: -0.5px;
}
.nav-links {
    display: flex;
    gap: 28px;
    list-style: none;
    flex-wrap: wrap;
}
.nav-links a {
    color: #2C3E58;
    text-decoration: none;
    font-weight: 500;
    transition: 0.2s;
}
.nav-links a:hover {
    color: #0D6EFD;
}
.lang-switch {
    display: flex;
    gap: 8px;
    background: #FFFFFF;
    padding: 6px 12px;
    border-radius: 40px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    border: 1px solid #DCE5F0;
}
.lang-btn {
    background: none;
    border: none;
    color: #5B6F8C;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    padding: 4px 10px;
    border-radius: 30px;
    transition: 0.2s;
    font-family: inherit;
    text-decoration: none;
}
.lang-btn.active {
    background: #0D6EFD;
    color: white;
}
.lang-btn:hover:not(.active) {
    background: #E9EDF2;
}

/* Buttons */
.btn-primary {
    background: #0D6EFD;
    color: white;
    border: none;
    padding: 12px 28px;
    font-weight: 700;
    border-radius: 40px;
    font-size: 1rem;
    cursor: pointer;
    transition: 0.25s;
    font-family: inherit;
    box-shadow: 0 4px 8px rgba(13,110,253,0.2);
    display: inline-block;
    text-decoration: none;
}
.btn-primary:hover {
    transform: translateY(-2px);
    background: #0b5ed7;
    box-shadow: 0 8px 18px rgba(13,110,253,0.25);
}

/* Hero */
.hero {
    padding: 80px 0 60px;
    text-align: center;
}
.hero h1 {
    font-size: 3.2rem;
    font-weight: 800;
    background: linear-gradient(120deg, #1E2F41, #0D6EFD);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 20px;
}
.hero p {
    font-size: 1.3rem;
    color: #3A4E6B;
    max-width: 700px;
    margin: 0 auto 32px;
}

/* Section titles */
.section-title {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 48px;
    text-align: center;
    position: relative;
    display: inline-block;
    width: 100%;
    color: #1E2F41;
}
.section-title:after {
    content: '';
    display: block;
    width: 70px;
    height: 3px;
    background: #0D6EFD;
    margin: 12px auto 0;
    border-radius: 4px;
}

.detail {
   margin-top: 18px;
}


/* Cards grid */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
    margin-bottom: 70px;
}
.service-card, .project-card {
    background: #FFFFFF;
    border-radius: 28px;
    padding: 28px 22px;
    transition: all 0.3s ease;
    border: 1px solid #E9EDF2;
    box-shadow: 0 8px 20px rgba(0,0,0,0.02);
}
.service-card:hover, .project-card:hover {
    transform: translateY(-6px);
    border-color: #0D6EFD;
    box-shadow: 0 20px 30px -12px rgba(13,110,253,0.15);
}
.service-icon, .project-icon {
    font-size: 2.2rem;
    margin-bottom: 20px;
    color: #0D6EFD;
}
.service-card h3, .project-card h3 {
    font-size: 1.6rem;
    margin-bottom: 12px;
    color: #0F2B3D;
}
.service-card p, .project-card p {
    color: #4A5F7A;
    margin-bottom: 16px;
}
.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 16px;
}
.tech-tags span {
    background: #EFF3F8;
    padding: 5px 12px;
    border-radius: 30px;
    font-size: 0.75rem;
    font-family: 'Fira Code', monospace;
    color: #0D6EFD;
    font-weight: 500;
}

/* About + Tech */
.about-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 48px;
    margin: 60px 0;
    background: #FFFFFF;
    border-radius: 40px;
    padding: 48px 36px;
    box-shadow: 0 12px 30px rgba(0,0,0,0.03);
    border: 1px solid #E9EDF2;
}
.about-col, .tech-col {
    flex: 1;
    min-width: 240px;
}
.about-col h3, .tech-col h3 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: #0F2B3D;
}
.tech-icons {
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
    margin-top: 20px;
}
.tech-item {
    background: #EFF3F8;
    padding: 8px 18px;
    border-radius: 60px;
    font-weight: 500;
    font-family: 'Fira Code', monospace;
    font-size: 0.9rem;
    color: #0D6EFD;
}

/* Contact */
.contact-row {
    display: flex;
    flex-wrap: wrap;
    gap: 48px;
    margin: 40px 0 60px;
}
.contact-info {
    flex: 1;
    background: #FFFFFF;
    padding: 32px;
    border-radius: 32px;
    border: 1px solid #E9EDF2;
}
.contact-form {
    flex: 1;
    background: #FFFFFF;
    padding: 32px;
    border-radius: 32px;
    border: 1px solid #E9EDF2;
}
.contact-info p {
    margin: 16px 0;
    display: flex;
    align-items: center;
    gap: 12px;
    color: #2C3E58;
}
.contact-info i {
    width: 1.8rem;
    font-size: 1.4rem;
    color: #0D6EFD;
    text-align: center;
}
.form-group {
    margin-bottom: 20px;
}
input, textarea {
    width: 100%;
    padding: 14px 18px;
    background: #F8FAFE;
    border: 1px solid #DCE5F0;
    border-radius: 24px;
    color: #1A2C3E;
    font-family: inherit;
    font-size: 1rem;
    transition: 0.2s;
}
input:focus, textarea:focus {
    outline: none;
    border-color: #0D6EFD;
    box-shadow: 0 0 0 3px rgba(13,110,253,0.1);
}
textarea {
    resize: vertical;
    min-height: 100px;
}
.honeypot {
    display: none;
}
#form-status {
    margin-top: 16px;
    font-size: 0.9rem;
}

/* Footer */
footer {
    text-align: center;
    padding: 40px 0 30px;
    border-top: 1px solid #E2E8F0;
    margin-top: 30px;
    color: #5B6F8C;
}

/* Responsive */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        align-items: center;
    }
    .hero h1 {
        font-size: 2.2rem;
    }
    .hero p {
        font-size: 1rem;
    }
    .section-title {
        font-size: 1.8rem;
    }
    .about-tech {
        padding: 32px 20px;
    }
}

/* Animations */
.fade-up {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-up.appear {
    opacity: 1;
    transform: translateY(0);
}

.btn-small {
    background: none;
    border: 1px solid #0D6EFD;
    color: #0D6EFD;
    border-radius: 30px;
    padding: 6px 14px;
    cursor: pointer;
    transition: 0.2s;
    font-weight: 500;
}
.btn-small:hover {
    background: rgba(13,110,253,0.08);
}

/* Button UP */
.scroll-top-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: #0D6EFD;
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.4rem;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(13, 110, 253, 0.3);
    transition: all 0.3s ease;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    z-index: 999;
}

.scroll-top-btn:hover {
    background: #0b5ed7;
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 6px 20px rgba(13, 110, 253, 0.4);
}

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

/* Mobile */
@media (max-width: 768px) {
    .scroll-top-btn {
        width: 44px;
        height: 44px;
        font-size: 1.2rem;
        bottom: 20px;
        right: 20px;
    }
}