/* ===== RESET & BASE ===== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-bg: #fafafa;
    --color-surface: #ffffff;
    --color-surface-alt: #f3f4f6;
    --color-dark: #0f172a;
    --color-dark-2: #1e293b;
    --color-text: #334155;
    --color-text-light: #64748b;
    --color-text-muted: #94a3b8;
    --color-accent: #0ea5e9;
    --color-accent-dark: #0284c7;
    --color-accent-glow: rgba(14, 165, 233, 0.1);
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;
    --color-white: #ffffff;
    --font-heading: 'Instrument Serif', Georgia, serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.08);
    --radius: 10px;
    --radius-lg: 16px;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

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

ul {
    list-style: none;
}

/* ===== UTILITIES ===== */
.container {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 130px 0;
}

.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 72px;
}

.section-label {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 2.5px;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 14px;
}

.section-title {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 400;
    color: var(--color-dark);
    line-height: 1.2;
    margin-bottom: 18px;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--color-text-light);
    line-height: 1.7;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    letter-spacing: 0.2px;
}

.btn-primary {
    background: var(--color-accent);
    color: var(--color-white);
}

.btn-primary:hover {
    background: var(--color-accent-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(14, 165, 233, 0.25);
}

.btn-ghost {
    background: transparent;
    color: var(--color-white);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-ghost:hover {
    border-color: rgba(255, 255, 255, 0.7);
    background: rgba(255, 255, 255, 0.05);
}

.btn-full {
    width: 100%;
}

/* ===== NAVIGATION ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    padding: 14px 0;
    box-shadow: 0 1px 12px rgba(0, 0, 0, 0.06);
    border-bottom: 1px solid var(--color-border-light);
}

.navbar.scrolled .logo-mark,
.navbar.scrolled .logo-name {
    color: var(--color-dark);
}

.navbar.scrolled .nav-links a {
    color: var(--color-text-light);
}

.navbar.scrolled .nav-links a:hover {
    color: var(--color-dark);
}

.navbar.scrolled .nav-cta {
    border-color: var(--color-border);
    color: var(--color-dark) !important;
}

.navbar.scrolled .nav-cta:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: var(--color-white) !important;
}

.navbar.scrolled .mobile-toggle span {
    background: var(--color-dark);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-mark {
    font-family: var(--font-body);
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--color-white);
    background: var(--color-accent);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    letter-spacing: 0.5px;
}

.logo-name {
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-white);
    letter-spacing: -0.2px;
}

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

.nav-links a {
    font-size: 0.85rem;
    font-weight: 400;
    color: rgba(255, 255, 255, 0.75);
}

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

.nav-cta {
    padding: 8px 20px;
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: var(--radius);
}

.nav-cta:hover {
    background: var(--color-accent) !important;
    border-color: var(--color-accent) !important;
    color: var(--color-white) !important;
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-toggle span {
    width: 22px;
    height: 1.5px;
    background: var(--color-white);
    transition: var(--transition);
    border-radius: 2px;
}

/* ===== HERO ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(160deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
}

.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 60% 30%, rgba(14, 165, 233, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 20% 70%, rgba(14, 165, 233, 0.04) 0%, transparent 40%);
}

.hero-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg width='48' height='48' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M0 24h48M24 0v48' stroke='rgba(255,255,255,0.02)' stroke-width='0.5' fill='none'/%3E%3C/svg%3E");
    background-size: 48px 48px;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 680px;
    padding-top: 80px;
}

.hero-tagline {
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 2.5px;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 24px;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: clamp(2.8rem, 6.5vw, 4.2rem);
    font-weight: 400;
    color: var(--color-white);
    line-height: 1.12;
    margin-bottom: 24px;
}

.hero-description {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.65);
    line-height: 1.8;
    margin-bottom: 40px;
    max-width: 540px;
}

.hero-actions {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

/* ===== ABOUT ===== */
.about {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border-light);
}

.about-layout {
    display: grid;
    grid-template-columns: 1fr 1.6fr;
    gap: 72px;
    margin-bottom: 72px;
    align-items: start;
}

.about-left .section-label {
    margin-bottom: 14px;
}

.about-left .section-title {
    margin-bottom: 0;
}

.about-right {
    font-size: 1.02rem;
    color: var(--color-text-light);
}

.about-lead {
    font-size: 1.12rem;
    color: var(--color-dark);
    font-weight: 400;
    margin-bottom: 18px;
    line-height: 1.7;
}

.about-right p + p {
    margin-top: 14px;
}

.about-metrics {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.metric {
    padding: 36px 28px;
    background: var(--color-surface-alt);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition);
}

.metric:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-border);
}

.metric-value {
    display: block;
    font-family: var(--font-heading);
    font-size: 2.2rem;
    color: var(--color-dark);
    margin-bottom: 6px;
}

.metric-label {
    font-size: 0.78rem;
    color: var(--color-text-muted);
    letter-spacing: 1px;
    text-transform: uppercase;
}

/* ===== PORTFOLIO ===== */
.portfolio {
    background: var(--color-bg);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.portfolio-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.card-accent {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-dark));
    opacity: 0;
    transition: opacity 0.4s ease;
}

.portfolio-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.portfolio-card:hover .card-accent {
    opacity: 1;
}

.card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 24px;
}

.card-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-glow);
    border-radius: var(--radius);
    color: var(--color-accent);
}

.card-number {
    font-family: var(--font-heading);
    font-size: 2rem;
    color: var(--color-border);
    line-height: 1;
}

.card-title {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 400;
    color: var(--color-dark);
    margin-bottom: 12px;
}

.card-description {
    font-size: 0.93rem;
    color: var(--color-text-light);
    line-height: 1.7;
    margin-bottom: 24px;
}

.card-list {
    display: grid;
    gap: 8px;
}

.card-list li {
    font-size: 0.84rem;
    color: var(--color-text-muted);
    padding-left: 16px;
    position: relative;
}

.card-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--color-accent);
}

/* ===== APPROACH ===== */
.approach {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border-light);
    border-bottom: 1px solid var(--color-border-light);
}

.approach-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.approach-item {
    padding: 36px 32px;
    background: var(--color-bg);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

.approach-item:hover {
    border-color: var(--color-border);
    box-shadow: var(--shadow-sm);
    transform: translateY(-2px);
}

.approach-number {
    font-family: var(--font-heading);
    font-size: 1.6rem;
    color: var(--color-accent);
    margin-bottom: 14px;
    opacity: 0.7;
}

.approach-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 10px;
}

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

/* ===== CONTACT ===== */
.contact {
    background: var(--color-bg);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1.8fr 1fr;
    gap: 48px;
    align-items: start;
}

.contact-form {
    padding: 44px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
}

.form-group {
    margin-bottom: 22px;
}

.form-group label {
    display: block;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-dark);
    margin-bottom: 7px;
    letter-spacing: 0.2px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 13px 15px;
    font-family: var(--font-body);
    font-size: 0.9rem;
    color: var(--color-text);
    background: var(--color-surface-alt);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius);
    transition: var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--color-accent);
    background: var(--color-surface);
    box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.form-group select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2394a3b8' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 15px center;
    padding-right: 36px;
}

.form-group textarea {
    resize: vertical;
    min-height: 110px;
}

.contact-details {
    display: grid;
    gap: 24px;
    padding-top: 20px;
}

.detail {
    padding: 28px;
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius);
}

.detail h4 {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: 8px;
}

.detail p {
    font-size: 0.95rem;
    color: var(--color-dark);
    line-height: 1.6;
}

/* ===== FOOTER ===== */
.footer {
    background: var(--color-dark);
    padding: 60px 0 36px;
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 36px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-brand .logo-mark {
    background: var(--color-accent);
}

.footer-brand .logo-name {
    color: var(--color-white);
}

.footer-brand p {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.4);
    margin-top: 10px;
    max-width: 320px;
}

.footer-nav {
    display: flex;
    gap: 28px;
}

.footer-nav a {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.45);
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    padding-top: 24px;
}

.footer-bottom p {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.3);
}

/* ===== ANIMATIONS ===== */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .portfolio-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .about-layout {
        grid-template-columns: 1fr;
        gap: 36px;
    }

    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: 36px;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 90px 0;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 260px;
        height: 100vh;
        background: var(--color-surface);
        flex-direction: column;
        justify-content: center;
        gap: 28px;
        padding: 40px;
        transition: right 0.3s ease;
        box-shadow: -4px 0 24px rgba(0, 0, 0, 0.1);
    }

    .nav-links.active {
        right: 0;
    }

    .nav-links a {
        color: var(--color-text) !important;
        font-size: 1rem;
    }

    .mobile-toggle {
        display: flex;
        z-index: 1001;
    }

    .mobile-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(4px, 4px);
    }

    .mobile-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .mobile-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(4px, -4px);
    }

    .hero-actions {
        flex-direction: column;
    }

    .hero-actions .btn {
        text-align: center;
    }

    .portfolio-grid,
    .approach-grid,
    .about-metrics {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .contact-form {
        padding: 28px;
    }

    .footer-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 24px;
    }

    .footer-nav {
        flex-wrap: wrap;
        gap: 16px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 6px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .section {
        padding: 72px 0;
    }

    .portfolio-card {
        padding: 32px 24px;
    }

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