:root {
    /* Brand Palette (from logo: navy + amber) */
    --navy-950: #0a1428;
    --navy-900: #0e1c3a;
    --navy-800: #14254e;
    --navy-700: #1b3168;
    --accent: #f59e0b;
    --accent-hover: #d97706;
    --accent-soft: rgba(245, 158, 11, 0.12);

    --primary-color: var(--navy-800);
    --secondary-color: var(--navy-900);
    --text-main: #243044;
    --text-muted: #5b6779;
    --bg-light: #f6f8fb;
    --bg-white: #ffffff;
    --border-color: #e6eaf1;

    /* Typography */
    --font-body: 'Inter', sans-serif;
    --font-display: 'Plus Jakarta Sans', 'Inter', sans-serif;

    /* Spacing & Sizing */
    --container-max-width: 1200px;
    --header-height: 80px;
    --section-padding: 110px 0;
    --radius-sm: 8px;
    --radius: 14px;
    --radius-lg: 20px;
    --transition: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(14, 28, 58, 0.06);
    --shadow-md: 0 6px 24px rgba(14, 28, 58, 0.08);
    --shadow-lg: 0 16px 48px rgba(14, 28, 58, 0.14);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    color: var(--text-main);
    line-height: 1.7;
    background-color: var(--bg-white);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
    font-family: var(--font-display);
    line-height: 1.25;
}

::selection {
    background-color: var(--accent);
    color: var(--navy-950);
}

ul {
    list-style: none;
}

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

a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 4px;
}

img {
    max-width: 100%;
    display: block;
}

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

.section {
    padding: var(--section-padding);
}

.bg-light {
    background-color: var(--bg-light);
}

.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 64px;
}

.section-tag {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 2.5px;
    text-transform: uppercase;
    color: var(--accent-hover);
    background-color: var(--accent-soft);
    padding: 6px 16px;
    border-radius: 100px;
    margin-bottom: 16px;
}

.section-header h2 {
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
    color: var(--secondary-color);
}

.section-header p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 30px;
    border-radius: 100px;
    font-family: var(--font-display);
    font-weight: 700;
    cursor: pointer;
    text-align: center;
    border: none;
    font-size: 1rem;
    transition: var(--transition);
}

.btn i {
    width: 18px;
    height: 18px;
    transition: transform var(--transition);
}

.btn:hover i {
    transform: translateX(4px);
}

.btn-primary {
    background-color: var(--accent);
    color: var(--navy-950);
    box-shadow: 0 8px 24px rgba(245, 158, 11, 0.35);
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(245, 158, 11, 0.45);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid rgba(255, 255, 255, 0.5);
    color: #fff;
}

.btn-outline:hover {
    background-color: #fff;
    border-color: #fff;
    color: var(--navy-900);
}

/* Header & Nav */
header {
    height: var(--header-height);
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    display: flex;
    align-items: center;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

header.scrolled {
    background-color: rgba(255, 255, 255, 0.97);
    border-bottom-color: var(--border-color);
    box-shadow: var(--shadow-md);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo a {
    display: flex;
    align-items: center;
}

.logo-img {
    height: 44px;
    width: auto;
}

.nav-links {
    display: flex;
    gap: 36px;
}

.nav-links a {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-main);
    position: relative;
    padding: 4px 0;
}

.nav-links a:hover {
    color: var(--navy-800);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    border-radius: 2px;
    background-color: var(--accent);
    transition: var(--transition);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.nav-links a.active {
    color: var(--navy-800);
    font-weight: 600;
}

.mobile-menu-btn {
    display: none;
    cursor: pointer;
    color: var(--navy-900);
    padding: 6px;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: url('../assets/images/hero.png') center center / cover no-repeat;
    padding-top: var(--header-height);
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    
}

.hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 120px;
    background: linear-gradient(to top, rgba(10, 20, 40, 0.6), transparent);
    pointer-events: none;
}

.hero .container {
    max-width: 100%;
    margin: 0;
    padding: 0 70px;
}

.hero-content {
    position: relative;
    width: 50%;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--accent);
    border: 1px solid rgba(245, 158, 11, 0.4);
    background-color: rgba(245, 158, 11, 0.08);
    padding: 8px 20px;
    border-radius: 100px;
    margin-bottom: 28px;
}

.hero h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    line-height: 1.1;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 24px;
    color: #ffffff;
}

.hero h1 span {
    color: var(--accent);
}

.hero p {
    font-size: 1.2rem;
    line-height: 1.75;
    color: #c4cedd;
    margin-bottom: 40px;
    max-width: 540px;
}

.hero-btns {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

/* About Section */
.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 70px;
    align-items: center;
}

.about-text p {
    margin-bottom: 22px;
    font-size: 1.08rem;
    color: var(--text-muted);
}

.about-features {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 18px;
    padding: 22px 26px;
    background-color: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    transition: var(--transition);
}

.feature-item:hover {
    transform: translateX(8px);
    background-color: #fff;
    border-color: rgba(245, 158, 11, 0.4);
    box-shadow: var(--shadow-md);
}

.feature-item i {
    flex-shrink: 0;
    width: 26px;
    height: 26px;
    color: var(--accent-hover);
}

.feature-item span {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--navy-900);
}

/* Services Section */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 28px;
}

.service-card {
    position: relative;
    background-color: var(--bg-white);
    padding: 42px 36px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--accent), var(--accent-hover));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(245, 158, 11, 0.35);
}

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

.service-card i {
    width: 56px;
    height: 56px;
    padding: 14px;
    color: var(--navy-800);
    background-color: var(--accent-soft);
    border-radius: var(--radius);
    margin-bottom: 26px;
    transition: var(--transition);
}

.service-card:hover i {
    background-color: var(--accent);
    color: var(--navy-950);
}

.service-card h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--secondary-color);
}

.service-card p {
    color: var(--text-muted);
    font-size: 0.98rem;
}

/* Portfolio Section */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 28px;
}

.portfolio-item {
    background-color: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.portfolio-item:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(245, 158, 11, 0.35);
}

.portfolio-img {
    height: 220px;
    background: linear-gradient(160deg, #f0f3f8, #e3e9f2);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    border-bottom: 1px solid var(--border-color);
    padding: 14px;
}

.portfolio-img img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: var(--radius-sm);
    transition: transform 0.45s ease;
}

.portfolio-item:hover .portfolio-img img {
    transform: scale(1.04);
}

.img-placeholder {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-muted);
    opacity: 0.5;
}

.portfolio-info {
    padding: 24px 26px;
}

.portfolio-info h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--secondary-color);
}

.portfolio-info a {
    color: var(--accent-hover);
    font-weight: 600;
    font-size: 0.95rem;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.portfolio-info a i {
    width: 16px;
    height: 16px;
    transition: transform var(--transition);
}

.portfolio-info a:hover {
    color: var(--navy-800);
}

.portfolio-info a:hover i {
    transform: translate(3px, -3px);
}

/* Contact Section */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
    align-items: start;
}

.contact-item {
    display: flex;
    gap: 20px;
    padding: 26px;
    margin-bottom: 18px;
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.contact-item:hover {
    box-shadow: var(--shadow-md);
    border-color: rgba(245, 158, 11, 0.35);
}

.contact-item i {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    padding: 12px;
    color: var(--accent-hover);
    background-color: var(--accent-soft);
    border-radius: 50%;
}

.contact-item h4 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 4px;
    color: var(--navy-900);
}

.contact-item p {
    color: var(--text-muted);
}

.contact-item a:hover {
    color: var(--accent-hover);
}

.contact-form {
    background-color: var(--bg-white);
    padding: 44px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 15px 18px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-light);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 1rem;
    color: var(--text-main);
    outline: none;
    transition: var(--transition);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: #94a0b3;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--accent);
    background-color: #fff;
    box-shadow: 0 0 0 4px var(--accent-soft);
}

.form-group input.invalid,
.form-group textarea.invalid {
    border-color: #dc2626;
    background-color: #fef2f2;
}

.form-group input.invalid:focus,
.form-group textarea.invalid:focus {
    box-shadow: 0 0 0 4px rgba(220, 38, 38, 0.1);
}

.field-error {
    display: block;
    color: #b91c1c;
    font-size: 0.85rem;
    margin-top: 6px;
    min-height: 0;
}

.contact-form .btn {
    width: 100%;
}

.contact-form .btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.form-status {
    margin-top: 16px;
    text-align: center;
    font-weight: 500;
    display: none;
}

.form-status.success {
    display: block;
    color: #15803d;
}

.form-status.error {
    display: block;
    color: #b91c1c;
}

/* Footer */
footer {
    background-color: var(--navy-950);
    color: #fff;
    padding: 80px 0 30px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 40px;
    margin-bottom: 60px;
}

.footer-logo a {
    display: inline-block;
    margin-bottom: 14px;
}

.footer-logo-img {
    height: 42px;
    width: auto;
    background-color: #fff;
    border-radius: 6px;
    padding: 4px 8px;
}

.footer-logo p {
    color: #8a96ab;
    max-width: 280px;
}

.footer-links ul {
    display: flex;
    flex-wrap: wrap;
    gap: 28px;
}

.footer-links a {
    color: #b6c0d2;
    font-size: 0.95rem;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    color: #8a96ab;
    font-size: 0.9rem;
}

/* Back to Top */
#back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background-color: var(--accent);
    color: var(--navy-950);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 8px 24px rgba(245, 158, 11, 0.4);
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
    z-index: 999;
}

#back-to-top.show {
    opacity: 1;
    visibility: visible;
}

#back-to-top:hover {
    background-color: var(--accent-hover);
    transform: translateY(-5px);
}

/* Scroll Reveal */
.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

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

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }

    *,
    *::before,
    *::after {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
    }
}

/* Responsive Styles */
@media (max-width: 992px) {
    .hero .container {
        padding: 0 24px;
    }

    .hero-content {
        width: 100%;
        max-width: 600px;
    }

    .hero::before {
        background: linear-gradient(to right, rgba(10, 20, 40, 0.94) 60%, rgba(10, 20, 40, 0.55) 100%);
    }

    .about-grid,
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .section {
        padding: 72px 0;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: flex;
        position: absolute;
        top: var(--header-height);
        left: 0;
        width: 100%;
        flex-direction: column;
        gap: 0;
        background-color: #fff;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-lg);
        padding: 12px 0;
        opacity: 0;
        visibility: hidden;
        transform: translateY(-12px);
        transition: var(--transition);
    }

    .nav-links.open {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .nav-links li {
        width: 100%;
    }

    .nav-links a {
        display: block;
        padding: 14px 24px;
        font-size: 1.05rem;
    }

    .nav-links a::after {
        display: none;
    }

    .nav-links a:hover,
    .nav-links a.active {
        background-color: var(--bg-light);
    }

    .mobile-menu-btn {
        display: block;
    }

    .hero-btns .btn {
        padding: 13px 26px;
    }

    .contact-form {
        padding: 30px 22px;
    }

    .footer-content {
        flex-direction: column;
        gap: 36px;
        text-align: center;
        align-items: center;
    }

    .footer-logo p {
        max-width: none;
    }

    .footer-links ul {
        justify-content: center;
    }
}