/* ============================================
   BTI Consulting — Modern CSS
   ============================================ */

/* --- Custom Properties --- */
:root {
	--purple: #300434;
	--purple-dark: #1a0220;
	--gold: #AB936B;
	--gold-light: #c9b08a;
	--gold-dark: #8a7654;
	--white: #ffffff;
	--gray-50: #f8f9fa;
	--gray-100: #f1f3f5;
	--gray-200: #e9ecef;
	--gray-400: #ced4da;
	--gray-600: #6c757d;
	--gray-800: #343a40;
	--gray-900: #212529;
	--font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
	--font-brand: 'Nova Square', sans-serif;
	--font-brand-sub: 'Gruppo', sans-serif;
	--radius: 16px;
	--radius-sm: 8px;
	--shadow: 0 4px 24px rgba(0,0,0,.08);
	--shadow-lg: 0 12px 48px rgba(0,0,0,.12);
	--transition: .3s cubic-bezier(.4,0,.2,1);
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
	font-family: var(--font-body);
	font-size: 16px;
	line-height: 1.7;
	color: var(--gray-800);
	background: var(--white);
	overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }
input, textarea, select { font: inherit; }

/* --- Utility --- */
.container {
	max-width: 1100px;
	margin: 0 auto;
	padding: 0 1.5rem;
}

.section {
	padding: 7rem 0;
}

.section-title {
	font-size: clamp(1.8rem, 4vw, 2.6rem);
	font-weight: 700;
	letter-spacing: -.02em;
	color: var(--gray-900);
	text-align: center;
	margin-bottom: .5rem;
}

.title-accent {
	width: 60px;
	height: 4px;
	background: linear-gradient(90deg, var(--gold), var(--gold-light));
	border-radius: 2px;
	margin: 0 auto 2rem;
}

.section-text {
	max-width: 680px;
	margin: 0 auto;
	text-align: center;
	font-size: 1.1rem;
	color: var(--gray-600);
	line-height: 1.85;
}

.section-intro {
	max-width: 720px;
	margin: 0 auto 3.5rem;
	text-align: center;
	font-size: 1.05rem;
	color: var(--gray-600);
	line-height: 1.8;
}

/* --- Buttons --- */
.btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	padding: .85rem 2.2rem;
	font-size: .95rem;
	font-weight: 600;
	border-radius: 50px;
	transition: all var(--transition);
	letter-spacing: .02em;
}

.btn-primary {
	background: linear-gradient(135deg, var(--gold), var(--gold-dark));
	color: var(--white);
	box-shadow: 0 4px 16px rgba(171,147,107,.35);
}

.btn-primary:hover {
	transform: translateY(-2px);
	box-shadow: 0 8px 28px rgba(171,147,107,.45);
}

/* --- Fade-in animation --- */
.fade-in {
	opacity: 0;
	transform: translateY(30px);
	transition: opacity .7s var(--transition), transform .7s var(--transition);
}

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

/* ============================================
   NAVBAR
   ============================================ */
.navbar {
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	z-index: 1000;
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding: 1.2rem 2.5rem;
	transition: all var(--transition);
}

.navbar.scrolled {
	background: rgba(255,255,255,.92);
	backdrop-filter: blur(16px);
	-webkit-backdrop-filter: blur(16px);
	box-shadow: 0 1px 12px rgba(0,0,0,.06);
	padding: .8rem 2.5rem;
}

.navbar.hidden {
	transform: translateY(-100%);
}

.nav-brand {
	display: flex;
	align-items: center;
	gap: .5rem;
	font-size: 1.4rem;
	font-weight: 700;
}


.brand-bti {
	font-family: var(--font-brand);
	color: var(--white);
	transition: color var(--transition);
}

.brand-consulting {
	font-family: var(--font-brand-sub);
	color: rgba(255,255,255,.7);
	margin-left: .15em;
	transition: color var(--transition);
}

.navbar.scrolled .brand-bti { color: var(--purple); }
.navbar.scrolled .brand-consulting { color: var(--gold); }

.nav-links {
	display: flex;
	gap: 2rem;
	align-items: center;
}

.nav-links a {
	font-size: .9rem;
	font-weight: 500;
	color: rgba(255,255,255,.8);
	transition: color var(--transition);
	position: relative;
}

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

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

.navbar.scrolled .nav-links a { color: var(--gray-800); }
.navbar.scrolled .nav-links a:hover { color: var(--gold); }

.nav-cta {
	background: rgba(255,255,255,.15);
	padding: .5rem 1.3rem !important;
	border-radius: 50px;
	backdrop-filter: blur(8px);
}

.nav-cta::after { display: none !important; }

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

.nav-toggle {
	display: none;
	flex-direction: column;
	gap: 5px;
	width: 28px;
}

.nav-toggle span {
	display: block;
	height: 2px;
	background: var(--white);
	border-radius: 2px;
	transition: all var(--transition);
}

.navbar.scrolled .nav-toggle span { background: var(--gray-800); }

.nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ============================================
   HERO
   ============================================ */
#hero {
	position: relative;
	height: 100vh;
	min-height: 600px;
	display: flex;
	align-items: center;
	justify-content: center;
	text-align: center;
	overflow: hidden;
}

.hero-bg {
	position: absolute;
	inset: 0;
	background: linear-gradient(160deg, var(--purple-dark) 0%, var(--purple) 40%, #4a1a50 70%, var(--gold-dark) 100%);
	background-size: 300% 300%;
	animation: heroShift 12s ease infinite;
}

@keyframes heroShift {
	0%, 100% { background-position: 0% 50%; }
	50% { background-position: 100% 50%; }
}

.hero-brand {
	display: flex;
	align-items: center;
	justify-content: center;
	gap: clamp(2rem, 5vw, 4rem);
	margin-bottom: 2.5rem;
}

.hero-logo {
	width: clamp(180px, 25vw, 320px);
	height: auto;
	filter: brightness(1.15) drop-shadow(0 0 40px rgba(171,147,107,.4));
}

.hero-brand-text h1 {
	text-align: left;
}

.hero-brand-text .brand-bti {
	display: block;
	font-size: clamp(5rem, 14vw, 11rem);
	line-height: .85;
	letter-spacing: .15em;
	color: var(--white);
	text-shadow:
		0 0 20px rgba(171,147,107,.6),
		0 0 60px rgba(171,147,107,.3),
		0 0 120px rgba(171,147,107,.15);
}

.hero-brand-text .brand-consulting {
	display: block;
	font-size: clamp(1.8rem, 4.5vw, 3.5rem);
	margin-left: .05em;
	letter-spacing: .08em;
}

.hero-content {
	position: relative;
	z-index: 1;
	padding: 0 1.5rem;
}

.hero-content .brand-bti {
	text-shadow: 0 0 30px rgba(171,147,107,.4);
}

.hero-tagline {
	font-size: clamp(1rem, 2.5vw, 1.3rem);
	color: rgba(255,255,255,.6);
	font-weight: 300;
	margin-bottom: 2.5rem;
	letter-spacing: .03em;
}

.scroll-indicator {
	position: absolute;
	bottom: 2rem;
	left: 50%;
	transform: translateX(-50%);
	z-index: 1;
}

.scroll-arrow {
	width: 24px;
	height: 24px;
	border-right: 2px solid rgba(255,255,255,.4);
	border-bottom: 2px solid rgba(255,255,255,.4);
	transform: rotate(45deg);
	animation: scrollBounce 2s ease-in-out infinite;
}

@keyframes scrollBounce {
	0%, 100% { transform: rotate(45deg) translateY(0); opacity: .4; }
	50% { transform: rotate(45deg) translateY(8px); opacity: 1; }
}

/* ============================================
   ABOUT
   ============================================ */
#about {
	background: var(--gray-50);
	position: relative;
	overflow: hidden;
}

.network-canvas {
	position: absolute;
	inset: 0;
	width: 100%;
	height: 100%;
	pointer-events: none;
	z-index: 0;
}

#about .container {
	position: relative;
	z-index: 1;
}

.section-card {
	background: var(--white);
	border-radius: var(--radius);
	padding: 4rem 3rem;
	box-shadow: var(--shadow);
	max-width: 780px;
	margin: 0 auto;
}

/* ============================================
   SERVICES
   ============================================ */
#services {
	background:
		radial-gradient(circle, rgba(171,147,107,.12) 1px, transparent 1px),
		radial-gradient(circle, rgba(171,147,107,.06) 1px, transparent 1px);
	background-size: 30px 30px, 15px 15px;
	background-position: 0 0, 7.5px 7.5px;
	background-color: var(--white);
}

.services-grid {
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	gap: 1.5rem;
}

.service-card {
	background: var(--white);
	border: 1px solid var(--gray-200);
	border-radius: var(--radius);
	padding: 2.5rem 2rem;
	text-align: center;
	transition: all var(--transition);
}

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

.service-icon {
	width: 64px;
	height: 64px;
	border-radius: 16px;
	background: linear-gradient(135deg, rgba(48,4,52,.06), rgba(171,147,107,.12));
	display: flex;
	align-items: center;
	justify-content: center;
	margin: 0 auto 1.5rem;
	font-size: 1.5rem;
	color: var(--gold);
	transition: all var(--transition);
}

.service-card:hover .service-icon {
	background: linear-gradient(135deg, var(--purple), var(--gold-dark));
	color: var(--white);
	transform: scale(1.1);
}

.service-card--featured {
	border-color: var(--gold);
	background: linear-gradient(160deg, rgba(48,4,52,.03), rgba(171,147,107,.08));
	box-shadow: 0 4px 24px rgba(171,147,107,.15);
	transform: scale(1.03);
}

.service-card--featured .service-icon {
	background: linear-gradient(135deg, var(--purple), var(--gold-dark));
	color: var(--white);
}

.service-card--featured:hover {
	transform: scale(1.03) translateY(-6px);
}

.service-card h3 {
	font-size: 1.05rem;
	font-weight: 600;
	margin-bottom: .6rem;
	color: var(--gray-900);
}

.service-card p {
	font-size: .9rem;
	color: var(--gray-600);
	line-height: 1.65;
}

/* ============================================
   CONTACT
   ============================================ */
#contact {
	background: linear-gradient(180deg, var(--gray-50) 0%, rgba(48,4,52,.06) 50%, rgba(48,4,52,.12) 100%);
	position: relative;
}

#contact .contact-card {
	border: 1px solid rgba(171,147,107,.15);
	backdrop-filter: blur(8px);
	background: rgba(255,255,255,.92);
}

.contact-card {
	background: var(--white);
	border-radius: var(--radius);
	padding: 4rem 3rem;
	box-shadow: var(--shadow);
	max-width: 700px;
	margin: 0 auto;
}

.contact-form {
	margin-top: 1.5rem;
}

.form-row {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 1.2rem;
}

.form-group {
	position: relative;
	margin-bottom: 1.2rem;
}

.form-group input,
.form-group textarea {
	width: 100%;
	padding: 1rem 1rem .6rem;
	border: 1.5px solid var(--gray-200);
	border-radius: var(--radius-sm);
	background: var(--gray-50);
	color: var(--gray-900);
	transition: all var(--transition);
	resize: vertical;
}

.form-group label {
	position: absolute;
	top: 1rem;
	left: 1rem;
	color: var(--gray-400);
	font-size: .9rem;
	pointer-events: none;
	transition: all var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
	outline: none;
	border-color: var(--gold);
	background: var(--white);
	box-shadow: 0 0 0 3px rgba(171,147,107,.12);
}

.form-group input:focus + label,
.form-group input:not(:placeholder-shown) + label,
.form-group textarea:focus + label,
.form-group textarea:not(:placeholder-shown) + label {
	top: .3rem;
	font-size: .72rem;
	color: var(--gold);
}

.form-alert {
	padding: 1rem 1.2rem;
	border-radius: var(--radius-sm);
	font-size: .95rem;
	margin-bottom: 1.5rem;
	text-align: center;
}

.form-alert--success {
	background: rgba(76, 175, 80, .1);
	color: #2e7d32;
	border: 1px solid rgba(76, 175, 80, .3);
}

.form-alert--error {
	background: rgba(211, 47, 47, .1);
	color: #c62828;
	border: 1px solid rgba(211, 47, 47, .3);
}

.btn-submit {
	width: 100%;
	padding: 1rem;
	font-size: 1rem;
	border: none;
	cursor: pointer;
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
	background: var(--purple-dark);
	padding: 3rem 0;
	text-align: center;
}

.footer-content {
	max-width: 1100px;
	margin: 0 auto;
	padding: 0 1.5rem;
}

.footer-brand {
	font-size: 1.6rem;
	margin-bottom: 1.2rem;
}

.footer-brand .brand-bti { color: var(--white); }
.footer-brand .brand-consulting { color: var(--gold); }

.footer-socials {
	display: flex;
	justify-content: center;
	gap: 1rem;
	margin-bottom: 1.5rem;
}

.footer-socials a {
	width: 42px;
	height: 42px;
	border-radius: 50%;
	border: 1px solid rgba(255,255,255,.15);
	display: flex;
	align-items: center;
	justify-content: center;
	color: rgba(255,255,255,.5);
	font-size: .95rem;
	transition: all var(--transition);
}

.footer-socials a:hover {
	background: var(--gold);
	border-color: var(--gold);
	color: var(--white);
	transform: translateY(-3px);
}

.footer-copy {
	font-size: .82rem;
	color: rgba(255,255,255,.35);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 900px) {
	.services-grid {
		grid-template-columns: repeat(2, 1fr);
	}
}

@media (max-width: 768px) {
	.nav-links {
		position: fixed;
		top: 0;
		right: 0;
		width: 280px;
		height: 100vh;
		background: var(--white);
		flex-direction: column;
		justify-content: center;
		gap: 2rem;
		transform: translateX(100%);
		transition: transform var(--transition);
		box-shadow: -4px 0 24px rgba(0,0,0,.1);
	}

	.nav-links.open { transform: translateX(0); }

	.nav-links a {
		color: var(--gray-800) !important;
		font-size: 1.1rem;
	}

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

	.nav-toggle { display: flex; }

	.section { padding: 5rem 0; }

	.section-card,
	.contact-card {
		padding: 2.5rem 1.5rem;
	}

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

	.hero-brand {
		flex-direction: column;
		gap: 1rem;
	}

	.hero-brand-text h1 {
		text-align: center;
	}
}

@media (max-width: 540px) {
	.services-grid {
		grid-template-columns: 1fr;
	}

	.navbar {
		padding: 1rem 1.2rem;
	}

	.navbar.scrolled {
		padding: .7rem 1.2rem;
	}
}