:root {
    --color-bg: #F2F2F2;
    --color-dark: #1F1F21;
    --color-stone: #333B47;
    --color-wood: #333B47;
    --color-accent: #B5D1E8;
    --color-beam: #B5D1E8;
    --color-light: #D1D9DE;
    --color-muted: #333B47;
    --font-sans: 'Inter', sans-serif;
    --font-mono: 'Space Grotesk', monospace;
    --font-display: 'Lexend Mega', sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--color-bg);
    color: var(--color-dark);
    font-family: var(--font-sans);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    min-height: 100vh;
    position: relative;
}

::selection {
    background-color: var(--color-accent);
    color: #ffffff;
}

a {
    color: inherit;
    text-decoration: none;
}

/* UTILITY & LAYOUT CLASSES */
.container {
    max-width: 80rem; /* 1280px */
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
}

.font-mono { font-family: var(--font-mono); }
.font-serif { font-family: serif; }

/* HEADER / NAVIGATION */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 50;
    background-color: rgba(242, 242, 242, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(22, 21, 19, 0.1);
    transition: all 0.3s ease;
}

.header-inner {
    height: 5rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    width: 2.25rem;
    height: 2.25rem;
    border: 1px solid rgba(22, 21, 19, 0.3);
    border-radius: 0.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: border-color 0.2s ease;
}

.logo-group:hover .logo-icon {
    border-color: var(--color-stone);
}

.logo-svg {
    width: 1.25rem;
    height: 1.25rem;
    color: var(--color-dark);
    transition: color 0.2s ease;
}

.logo-group:hover .logo-svg {
    color: var(--color-stone);
}

.logo-text-title {
    font-family: var(--font-display);
    font-size: 1.125rem;
    letter-spacing: 0.2em;
    font-weight: 600;
    text-transform: uppercase;
    line-height: 1;
}

.logo-text-sub {
    font-family: var(--font-mono);
    font-size: 9px;
    letter-spacing: 0.3em;
    color: var(--color-muted);
    text-transform: uppercase;
    margin-top: 0.25rem;
    display: block;
}

.nav-menu {
    display: none;
    align-items: center;
    gap: 2rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    color: var(--color-stone);
}

@media (min-width: 768px) {
    .nav-menu {
        display: flex;
    }
}

.nav-link {
    transition: color 0.2s ease;
}

.nav-link:hover {
    color: var(--color-dark);
}

.nav-prefix {
    color: var(--color-muted);
}

.btn-inquire {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    padding: 0.625rem 1.25rem;
    border-radius: 9999px;
    border: 1px solid rgba(22, 21, 19, 0.3);
    text-transform: uppercase;
    transition: all 0.2s ease;
}

.btn-inquire:hover {
    border-color: var(--color-dark);
    background-color: var(--color-dark);
    color: #ffffff;
}

/* HERO SECTION */
.hero {
    padding-top: 10rem;
    padding-bottom: 6rem;
    min-height: 70vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
}

.hero-title {
    font-size: 2.25rem;
    font-weight: 400;
    letter-spacing: -0.04em;
    color: var(--color-dark);
    text-transform: uppercase;
    font-family: var(--font-display);
    line-height: 1.15;
}

@media (min-width: 768px) {
    .hero-title { font-size: 3.25rem; }
}

@media (min-width: 1024px) {
    .hero-title { font-size: 3.75rem; }
}

.hero-title-sub {
    font-style: italic;
    font-family: serif;
    text-transform: lowercase;
    color: var(--color-stone);
    font-weight: 400;
}

/* HERO CSS GRID LAYOUT */
.hero-grid {
    margin-top: 3rem;
    display: grid;
    grid-template-columns: 1fr;
    gap: 2.5rem;
    align-items: start;
    border-top: 1px solid rgba(22, 21, 19, 0.1);
    padding-top: 2.5rem;
}

@media (min-width: 768px) {
    .hero-grid {
        grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
        gap: 4rem;
    }
}

.hero-description {
    color: var(--color-stone);
    font-size: 1rem;
    line-height: 1.625;
    font-weight: 300;
}

@media (min-width: 768px) {
    .hero-description { font-size: 1.125rem; }
}

.mandate-box {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-muted);
    border-left: 1px solid rgba(22, 21, 19, 0.15);
    padding-left: 1.75rem;
    display: grid;
    grid-template-rows: auto auto;
    gap: 0.75rem;
}

.mandate-title {
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-dark);
    font-weight: 500;
}

/* SECTION COMMON HEADER GRID */
.section-header {
    display: grid;
    grid-template-columns: 1fr;
    margin-bottom: 4rem;
    gap: 1rem;
}

@media (min-width: 768px) {
    .section-header {
        grid-template-columns: 1fr auto;
        align-items: end;
    }
}

.section-tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-stone);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.section-heading {
    font-size: 1.5rem;
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: -0.025em;
    margin-top: 0.5rem;
}

@media (min-width: 768px) {
    .section-heading { font-size: 2.25rem; }
}

/* ADVANTAGES CSS GRID LAYOUT */
.advantages-section {
    padding-top: 6rem;
    padding-bottom: 6rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    background-color: #1F1F21;
    color: #F2F2F2;
}

.advantages-section .section-heading {
    color: #F2F2F2;
}

.advantages-section .section-tag {
    color: var(--color-accent);
}

.advantages-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 768px) {
    .advantages-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

.advantage-card {
    display: grid;
    grid-template-rows: auto auto 1fr;
    padding: 2.25rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 0.25rem;
    background-color: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(4px);
    transition: all 0.2s ease;
}

.advantage-card:hover {
    border-color: var(--color-accent);
    background-color: rgba(255, 255, 255, 0.06);
}

.card-num {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-accent);
    margin-bottom: 1rem;
}

.card-title {
    font-family: var(--font-mono);
    font-size: 1.125rem;
    text-transform: uppercase;
    font-weight: 500;
    margin-bottom: 0.75rem;
    color: #FFFFFF;
}

.card-text {
    color: #D1D9DE;
    font-size: 0.875rem;
    line-height: 1.625;
    font-weight: 300;
}

/* TIMELINE / PROCESS SECTION GRID LAYOUT */
.process-section {
    padding-top: 6rem;
    padding-bottom: 6rem;
    border-top: 1px solid rgba(22, 21, 19, 0.1);
}

.process-interactive-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2.5rem;
    align-items: stretch;
}

@media (min-width: 1024px) {
    .process-interactive-grid {
        grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
        gap: 3.5rem;
    }
}

.featured-visual-box {
    width: 100%;
    height: 100%;
    min-height: 320px;
    aspect-ratio: 4/3;
    background-color: #FFFFFF;
    border: 1px solid rgba(22, 21, 19, 0.15);
    border-radius: 0.25rem;
    display: grid;
    place-items: center;
    padding: 1.5rem;
    position: relative;
    overflow: hidden;
    box-shadow: 0 12px 36px rgba(0, 0, 0, 0.04);
}

.featured-visual-svg {
    width: 100%;
    height: 100%;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.phases-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

.phase-tab-card {
    display: grid;
    grid-template-rows: auto 1fr;
    gap: 0.5rem;
    padding: 1.5rem;
    border: 1px solid rgba(22, 21, 19, 0.12);
    border-radius: 0.25rem;
    background-color: #FFFFFF;
    cursor: pointer;
    transition: all 0.25s ease;
    position: relative;
}

.phase-tab-card:hover {
    border-color: var(--color-stone);
    background-color: rgba(255, 255, 255, 0.9);
}

.phase-tab-card.active {
    border-color: var(--color-dark);
    background-color: #FFFFFF;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}

.phase-tab-card.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background-color: var(--color-dark);
    border-top-left-radius: 0.25rem;
    border-bottom-left-radius: 0.25rem;
}

.phase-tab-header {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 1rem;
}

.phase-tab-title {
    font-family: var(--font-mono);
    font-size: 1rem;
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.phase-tab-badge {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-stone);
    letter-spacing: 0.1em;
}

.phase-tab-text {
    color: var(--color-stone);
    font-size: 0.875rem;
    line-height: 1.5;
    font-weight: 300;
}

/* FOOTER CSS GRID LAYOUT */
.footer {
    background-color: #1A1A1C;
    color: #FFFFFF;
    padding-top: 5rem;
    padding-bottom: 5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
}

@media (min-width: 768px) {
    .footer-grid {
        grid-template-columns: minmax(0, 2fr) minmax(0, 1fr) minmax(0, 1.2fr);
        gap: 4rem;
    }
}

.footer-brand {
    display: grid;
    grid-template-rows: auto 1fr;
    gap: 1.25rem;
}

.footer-text {
    color: #D1D9DE;
    font-size: 0.875rem;
    line-height: 1.625;
    font-weight: 300;
    max-width: 28rem;
}

.footer-col-title {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    color: var(--color-accent);
    text-transform: uppercase;
    margin-bottom: 1.25rem;
}

.footer-info {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    align-content: start;
    font-size: 0.875rem;
    color: #D1D9DE;
}

.footer-label {
    font-family: var(--font-mono);
    font-size: 10px;
    color: rgba(255, 255, 255, 0.4);
    display: block;
    margin-bottom: 0.25rem;
}

.footer-link {
    color: #FFFFFF;
    transition: color 0.2s ease;
}

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

.footer-bottom {
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.4);
}

@media (min-width: 768px) {
    .footer-bottom {
        grid-template-columns: 1fr auto;
        align-items: center;
    }
}