/* ==========================================================
   Sound Unified Communications — Modern Design System
   ========================================================== */

/* --- Tokens --- */
:root {
    --color-bg: #ffffff;
    --color-surface: #f8f9fb;
    --color-surface-raised: #ffffff;
    --color-border: #e5e7eb;
    --color-text: #111827;
    --color-text-secondary: #6b7280;
    --color-text-tertiary: #9ca3af;
    --color-brand: #0078d4;
    --color-brand-dark: #005a9e;
    --color-brand-light: #deecf9;
    --color-accent: #50e6ff;

    --font: "Inter", "Segoe UI Variable", "Segoe UI", -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: "Cascadia Code", "Fira Code", Consolas, monospace;

    --ease: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-out: cubic-bezier(0, 0, 0.2, 1);

    --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,.08);
    --shadow-lg: 0 12px 32px rgba(0,0,0,.1);
    --shadow-xl: 0 24px 48px rgba(0,0,0,.12);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --header-h: 64px;
    --section-py: clamp(64px, 10vw, 120px);
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 24px); -webkit-text-size-adjust: 100%; }
body { font-family: var(--font); line-height: 1.6; color: var(--color-text); background: var(--color-bg); overflow-x: hidden; -webkit-font-smoothing: antialiased; }
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
img, svg { display: block; max-width: 100%; }
button { font: inherit; cursor: pointer; border: none; background: none; }

.container { width: 100%; max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* ==========================================================
   Header
   ========================================================== */
header {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--header-h);
    background: rgba(255,255,255,0.82);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border-bottom: 1px solid var(--color-border);
    transition: box-shadow .3s var(--ease-out);
}

header.scrolled { box-shadow: var(--shadow-md); }

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.logo-mark { flex-shrink: 0; }

.logo-name {
    font-weight: 700;
    font-size: 1rem;
    letter-spacing: -0.02em;
    color: var(--color-text);
    white-space: nowrap;
}

/* Nav */
nav ul {
    display: flex;
    align-items: center;
    gap: 4px;
}

nav a {
    display: block;
    padding: 8px 16px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    transition: color .2s, background .2s;
}

nav a:hover { color: var(--color-text); background: var(--color-surface); }

.nav-cta {
    background: var(--color-brand) !important;
    color: #fff !important;
    font-weight: 600 !important;
    padding: 8px 20px !important;
    border-radius: var(--radius-sm) !important;
    margin-left: 8px;
}

.nav-cta:hover { background: var(--color-brand-dark) !important; }

/* Mobile toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    z-index: 110;
}

.menu-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: transform .3s var(--ease), opacity .2s;
}

.menu-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ==========================================================
   Hero
   ========================================================== */
.hero {
    position: relative;
    min-height: min(92vh, 800px);
    display: flex;
    align-items: center;
    overflow: hidden;
    background: var(--color-text);
    color: #fff;
}

.hero-gradient {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 60% at 20% 100%, rgba(0,120,212,0.5) 0%, transparent 70%),
        radial-gradient(ellipse 60% 50% at 80% 10%, rgba(80,230,255,0.25) 0%, transparent 60%),
        linear-gradient(180deg, #111827 0%, #1e293b 100%);
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 64px 64px;
    mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, black 20%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, black 20%, transparent 70%);
}

.hero-fade {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 120px;
    background: linear-gradient(transparent, var(--color-bg));
}

.hero-inner {
    position: relative;
    z-index: 2;
    max-width: 720px;
    padding-top: 80px;
    padding-bottom: 120px;
}

.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 999px;
    font-size: 0.8125rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    color: var(--color-accent);
    margin-bottom: 28px;
    backdrop-filter: blur(8px);
}

.hero h1 {
    font-size: clamp(2.25rem, 5vw, 3.5rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 20px;
}

.hero-accent {
    background: linear-gradient(135deg, var(--color-accent), #a5f3fc, #fff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-sub {
    font-size: 1.125rem;
    line-height: 1.7;
    color: rgba(255,255,255,0.7);
    max-width: 560px;
    margin-bottom: 36px;
}

.hero-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* ==========================================================
   Buttons
   ========================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 28px;
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    transition: all .25s var(--ease);
    white-space: nowrap;
}

.btn-primary {
    background: var(--color-brand);
    color: #fff;
    box-shadow: 0 1px 3px rgba(0,120,212,0.3);
}

.btn-primary:hover {
    background: var(--color-brand-dark);
    box-shadow: 0 4px 16px rgba(0,120,212,0.35);
    transform: translateY(-1px);
}

.btn-ghost {
    color: rgba(255,255,255,0.85);
    border: 1px solid rgba(255,255,255,0.2);
    background: rgba(255,255,255,0.06);
}

.btn-ghost:hover {
    background: rgba(255,255,255,0.12);
    border-color: rgba(255,255,255,0.35);
}

/* ==========================================================
   Social Proof Strip
   ========================================================== */
.proof { padding: 48px 0 0; }

.proof-strip {
    display: flex;
    align-items: center;
    gap: 32px;
    padding: 24px 32px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    flex-wrap: wrap;
}

.proof-label {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    white-space: nowrap;
}

.proof-logos {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    align-items: center;
}

.proof-logos span {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    padding: 4px 14px;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    white-space: nowrap;
}

/* ==========================================================
   Section Headers
   ========================================================== */
.section-header { margin-bottom: 56px; }

.label {
    font-size: 0.8125rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-brand);
    margin-bottom: 12px;
}

.section-header h2 {
    font-size: clamp(1.75rem, 3.5vw, 2.5rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.025em;
    color: var(--color-text);
}

/* ==========================================================
   Services Cards
   ========================================================== */
.services { padding: var(--section-py) 0; }

.card-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.card {
    background: var(--color-surface-raised);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    transition: transform .35s var(--ease), box-shadow .35s var(--ease), border-color .35s;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-brand-light);
}

.card-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-brand-light);
    border-radius: var(--radius-sm);
    color: var(--color-brand);
}

.card h3 {
    font-size: 1.125rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.card p {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.65;
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: auto;
    padding-top: 8px;
}

.card-tags li {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 999px;
    background: var(--color-surface);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
}

/* ==========================================================
   Approach / Steps
   ========================================================== */
.approach {
    padding: var(--section-py) 0;
    background: var(--color-surface);
}

.steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background: var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.step {
    background: var(--color-surface-raised);
    padding: 36px 28px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.step-num {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    font-weight: 700;
    color: var(--color-brand);
    letter-spacing: 0.04em;
}

.step h3 {
    font-size: 1.0625rem;
    font-weight: 700;
}

.step p {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.65;
}

/* ==========================================================
   Results / Metrics
   ========================================================== */
.results {
    padding: var(--section-py) 0;
}

.metrics {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.metric {
    text-align: center;
    padding: 40px 20px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-surface-raised);
    transition: transform .35s var(--ease), box-shadow .35s var(--ease);
}

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

.metric-value {
    display: block;
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--color-brand);
    line-height: 1;
    margin-bottom: 8px;
}

.metric-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
}

/* ==========================================================
   Contact
   ========================================================== */
.contact {
    padding: var(--section-py) 0;
    background: var(--color-surface);
}

.contact-card {
    background: var(--color-surface-raised);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: clamp(40px, 6vw, 64px);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.contact-text h2 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
    line-height: 1.2;
}

.contact-text p {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.contact-channels {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.channel {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    transition: all .25s var(--ease);
}

.channel:hover {
    border-color: var(--color-brand);
    background: var(--color-brand-light);
    transform: translateX(4px);
}

.channel svg {
    flex-shrink: 0;
    color: var(--color-brand);
}

.channel strong {
    display: block;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-tertiary);
    margin-bottom: 2px;
}

.channel span {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-text);
}

/* ==========================================================
   Footer
   ========================================================== */
footer {
    padding: 48px 0 32px;
    border-top: 1px solid var(--color-border);
}

.footer-inner {
    display: flex;
    flex-direction: column;
    gap: 24px;
    align-items: center;
    text-align: center;
}

.footer-name {
    font-weight: 700;
    font-size: 0.9375rem;
    color: var(--color-text);
}

.footer-brand p {
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
    margin-top: 4px;
}

.footer-nav {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    justify-content: center;
}

.footer-nav a {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color .2s;
}

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

.footer-copy {
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
}

/* ==========================================================
   Scroll Reveal
   ========================================================== */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity .7s var(--ease-out), transform .7s var(--ease-out);
}

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

/* ==========================================================
   Focus / Accessibility
   ========================================================== */
:focus-visible {
    outline: 2px solid var(--color-brand);
    outline-offset: 2px;
    border-radius: 4px;
}

/* ==========================================================
   Responsive
   ========================================================== */
@media (max-width: 1024px) {
    .card-grid { grid-template-columns: repeat(2, 1fr); }
    .steps { grid-template-columns: repeat(2, 1fr); }
    .metrics { grid-template-columns: repeat(2, 1fr); }
    .contact-card { grid-template-columns: 1fr; gap: 32px; }
}

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

    nav {
        position: fixed;
        inset: 0;
        background: rgba(255,255,255,0.97);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        display: flex;
        align-items: center;
        justify-content: center;
        opacity: 0;
        visibility: hidden;
        transition: opacity .3s, visibility .3s;
        z-index: 105;
    }

    nav.open { opacity: 1; visibility: visible; }

    nav ul {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }

    nav a {
        font-size: 1.125rem;
        padding: 12px 24px;
    }

    .nav-cta { margin-left: 0 !important; }

    .hero-inner { padding-top: 60px; padding-bottom: 80px; }
    .hero h1 { font-size: clamp(1.75rem, 6vw, 2.75rem); }

    .card-grid { grid-template-columns: 1fr; }
    .steps { grid-template-columns: 1fr; }
    .metrics { grid-template-columns: 1fr 1fr; }

    .proof-strip { flex-direction: column; align-items: flex-start; gap: 16px; }
}

@media (max-width: 480px) {
    .metrics { grid-template-columns: 1fr; }
    .hero-actions { flex-direction: column; }
    .btn { width: 100%; justify-content: center; }
    .logo-name { font-size: 0.875rem; }
}

/* ==========================================================
   Reduced motion
   ========================================================== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.001ms !important;
        transition-duration: 0.001ms !important;
    }
    .reveal { opacity: 1; transform: none; }
    html { scroll-behavior: auto; }
}