/* ============================================
   BASE STYLES
   Global resets, variables, typography, layout
   ============================================ */

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

:root {
    --color-bg: #ffffff;
    --color-text: #0a0a0a;
    --color-text-muted: #666666;
    --color-border: #e5e5e5;
    --color-accent: #007c87;
    --color-accent-dark: #006672;
    --color-bg-alt: #fafafa;
    --spacing-md: 4rem;
    --spacing-lg: 6rem;
    --spacing-xl: 8rem;
    --max-width: 1200px;
    --font-display: 'Barlow Condensed', sans-serif;
    --font-body: 'Barlow', sans-serif;
    --font-mono: 'Space Mono', monospace;
}

body {
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    font-size: 17px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

/* Header */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    padding: 1.5rem 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--color-border);
    transition: transform 0.3s cubic-bezier(0.75, 0, 0.25, 1);
}

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

.logo-link {
    display: flex;
    align-items: center;
    z-index: 1001;
    position: relative;
    cursor: pointer;
}

.logo {
    height: 32px;
}

/* Desktop Nav */
nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

nav a {
    color: var(--color-text);
    text-decoration: none;
    font-family: var(--font-body);
    font-size: 0.9375rem;
    font-weight: 500;
    transition: color 0.3s;
}

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

/* "Book a Call" button in nav */
.nav-cta {
    background: var(--color-accent);
    color: white !important;
    padding: 0.625rem 1.5rem;
    border-radius: 4px;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    transition: background 0.3s, transform 0.2s, box-shadow 0.3s;
    box-shadow: 0 2px 8px rgba(0, 124, 135, 0.2);
}

.nav-cta:hover {
    background: var(--color-accent-dark);
    color: white !important;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 124, 135, 0.3);
}

/* Hamburger Toggle — hidden on desktop */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1001;
    position: relative;
}

.mobile-menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    margin: 5px 0;
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

/* Hamburger → X animation when open */
.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Layout */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

section {
    position: relative;
}

/* Standard Content Sections */
.content-section {
    padding: var(--spacing-xl) 0;
    background: var(--color-bg);
    position: relative;
    z-index: 1;
}

.content-section.alt-bg {
    background: var(--color-bg-alt);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: 0.02em;
}

.section-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.375rem);
    color: var(--color-text-muted);
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.7;
}

#how-we-work .section-subtitle,
.principles-subtitle,
#what-we-do .section-subtitle {
    color: var(--color-accent);
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    font-size: 0.9375rem;
}

/* Section Navigation Buttons */
.section-nav-button {
    display: block;
    width: fit-content;
    margin: 3rem auto 0;
    padding: 0.875rem 2.5rem;
    background: transparent;
    color: var(--color-accent);
    border: 2px solid var(--color-accent);
    text-decoration: none;
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    border-radius: 4px;
    transition: all 0.3s;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.section-nav-button:hover {
    background: var(--color-accent);
    color: white;
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 12px 36px rgba(0, 124, 135, 0.35),
                0 0 24px rgba(0, 124, 135, 0.15),
                0 0 0 1px rgba(0, 124, 135, 0.3);
}

/* Shared Components */
.highlight-text {
    position: relative;
    display: inline;
    font-weight: 700;
    background: linear-gradient(to right, rgba(0, 124, 135, 0.25) 0%, rgba(0, 124, 135, 0.25) 100%);
    background-size: 0% 100%;
    background-repeat: no-repeat;
    padding: 0.4rem 0.8rem;
    border-radius: 2px;
    box-decoration-break: clone;
    -webkit-box-decoration-break: clone;
}

.block-divider {
    height: 1px;
    background: linear-gradient(to right, transparent 0%, var(--color-border) 50%, transparent 100%);
    margin: 0.25rem 0;
    opacity: 0.6;
}

@keyframes highlightSweep {
    0% { background-size: 0% 100%; }
    100% { background-size: 100% 100%; }
}

/* ---- Shared visual DNA (portfolio-inspired) ---- */

/* Reusable noise overlay for dark sections */
.section-noise {
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
    background-size: 256px 256px;
    pointer-events: none;
    z-index: 1;
}

/* Gradient text utility: white → teal */
.gradient-text {
    background: linear-gradient(135deg, #ffffff 20%, #007c87 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Dark variant: dark → teal (for light sections) */
.gradient-text-dark {
    background: linear-gradient(135deg, var(--color-text) 30%, #007c87 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 900;
    width: 44px;
    height: 44px;
    border: none;
    border-radius: 50%;
    background: var(--color-accent);
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 16px rgba(0, 124, 135, 0.3);
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px);
    transition: opacity 0.35s ease, visibility 0.35s ease, transform 0.35s ease, background 0.25s ease;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--color-accent-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 124, 135, 0.4);
}

/* ---- Responsive: mobile menu from 1024px down (avoids nav wrap ~900px) ---- */
@media (max-width: 1024px) {
    .container {
        padding: 0 1.5rem;
    }

    .content-section {
        padding: 4rem 0;
    }

    .section-title {
        font-size: 2rem;
    }

    .section-subtitle {
        font-size: 1.0625rem;
    }

    .highlight-text {
        padding: 0.15rem 0.4rem;
    }

    .section-nav-button {
        padding: 0.75rem 2rem;
        font-size: 0.9375rem;
        width: calc(100% - 3rem);
        margin: 2.5rem auto 0;
    }

    header {
        padding: 1rem 0;
    }

    .logo {
        height: 28px;
    }

    /* Show hamburger, hide desktop nav */
    .mobile-menu-toggle {
        display: block;
    }

    /* Hamburger lines turn white when menu is open */
    .mobile-menu-toggle.active span {
        background: #ffffff;
    }

    /* --- Mobile nav: hidden by default --- */
    nav {
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 0;
        display: flex;
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        background: #0a0a0a;
        z-index: 998;
    }

    nav.open {
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
    }

    nav a {
        font-family: var(--font-display);
        font-size: 1.75rem;
        font-weight: 600;
        text-transform: uppercase;
        letter-spacing: 0.06em;
        color: rgba(255, 255, 255, 0.7);
        padding: 1rem 0;
        opacity: 0;
        transform: translateY(16px);
        transition: opacity 0.3s ease, transform 0.3s ease, color 0.3s;
    }

    nav a:hover {
        color: #ffffff;
    }

    /* --- When menu is open, header becomes full-screen --- */
    body.menu-open {
        overflow: hidden;
    }

    body.menu-open header {
        bottom: 0;
        background: #0a0a0a;
        border-bottom: none;
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
    }

    body.menu-open .logo {
        filter: brightness(0) invert(1);
    }

    /* Staggered entrance for nav links */
    nav.open a { opacity: 1; transform: translateY(0); }
    nav.open a:nth-child(1) { transition-delay: 0.04s; }
    nav.open a:nth-child(2) { transition-delay: 0.08s; }
    nav.open a:nth-child(3) { transition-delay: 0.12s; }
    nav.open a:nth-child(4) { transition-delay: 0.16s; }
    nav.open a:nth-child(5) { transition-delay: 0.2s; }
    nav.open a:nth-child(6) { transition-delay: 0.24s; }
    nav.open a:nth-child(7) { transition-delay: 0.28s; }
    nav.open a:nth-child(8) { transition-delay: 0.32s; }
    nav.open a:nth-child(9) { transition-delay: 0.36s; }

    /* "Book a Call" CTA in mobile menu */
    nav .nav-cta {
        margin-top: 2rem;
        padding: 1rem 2.5rem;
        font-size: 1.125rem;
        border-radius: 4px;
        color: #ffffff !important;
    }
}

@media (max-width: 480px) {
    .content-section {
        padding: 3rem 0;
    }

    nav a {
        font-size: 1.5rem;
        padding: 0.75rem 0;
    }

    nav .nav-cta {
        font-size: 1rem;
        padding: 0.875rem 2rem;
    }
}