:root {
--gold: #d4af37;
--gold-soft: #e0b95a;
--black: #000000;
--black-soft: #111111;
--white: #ffffff;
--text-muted: #666666;
--bg-main: #f4f4f6;
--bg-alt: #f9f6f0;
--font-main: "Segoe UI", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
}

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

body {
font-family: var(--font-main);
background-color: var(--bg-main);
color: var(--black-soft);
line-height: 1.6;
}

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

img {
max-width: 100%;
display: block;
}

.container {
width: 100%;
max-width: 1120px;
margin: 0 auto;
padding: 0 1.5rem;
}

.top-header {
position: sticky;
top: 0;
z-index: 50;
background: linear-gradient(to bottom, #000000, rgba(0, 0, 0, 0.9));
border-bottom: 1px solid rgba(212, 175, 55, 0.3);
backdrop-filter: blur(10px);
transition: transform 0.3s ease-in-out;
}

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

.header-content {
display: flex;
align-items: center;
justify-content: space-between;
gap: 2rem;
padding: 0.75rem 0.5rem;
}

.brand {
display: flex;
align-items: center;
gap: 1rem;
}

.logo {
width: 64px;
height: 64px;
object-fit: contain;
}

.brand-text {
display: flex;
flex-direction: column;
gap: 0.15rem;
}

.brand-name {
font-size: 1.1rem;
font-weight: 600;
letter-spacing: 0.08em;
text-transform: uppercase;
color: var(--gold);
}

.brand-tagline {
font-size: 0.85rem;
color: var(--text-muted);
}

.main-nav {
display: flex;
gap: 1.25rem;
font-size: 0.95rem;
}

.main-nav a {
position: relative;
padding-bottom: 0.2rem;
}

.main-nav a::after {
content: "";
position: absolute;
left: 0;
bottom: 0;
width: 0;
height: 2px;
background: linear-gradient(90deg, var(--gold), var(--gold-soft));
transition: width 0.2s ease-out;
}

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

.hero {
background: radial-gradient(circle at top left, rgba(212, 175, 55, 0.15), transparent 55%), radial-gradient(circle at bottom right, rgba(0, 0, 0, 0.04), transparent 60%), #fdfdfd;
padding: 6rem 0 4rem;
border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.hero-content {
display: flex;
align-items: center;
justify-content: space-between;
gap: 3rem;
}

.hero-text {
max-width: 640px;
padding: 2.25rem 2rem;
border-radius: 1.5rem;
background: rgba(255, 255, 255, 0.96);
box-shadow: 0 18px 45px rgba(15, 15, 30, 0.16);
}

.hero-video {
flex: 1;
display: flex;
align-items: center;
justify-content: center;
}

.video-frame {
width: 100%;
max-width: 520px;
aspect-ratio: 16 / 9;
border-radius: 1.2rem;
overflow: hidden;
box-shadow: 0 20px 50px rgba(15, 15, 30, 0.3);
border: 2px solid rgba(212, 175, 55, 0.4);
background-color: #000;
}

.video-frame iframe {
width: 100%;
height: 100%;
border: none;
display: block;
}

.hero h1 {
font-size: 2.5rem;
line-height: 1.2;
margin-bottom: 1rem;
}

.hero p {
font-size: 1rem;
color: var(--text-muted);
margin-bottom: 1.5rem;
}

.hero-actions {
display: flex;
flex-wrap: wrap;
gap: 0.75rem;
margin-bottom: 1.5rem;
}

.btn {
display: inline-flex;
align-items: center;
justify-content: center;
padding: 0.7rem 1.4rem;
border-radius: 999px;
font-size: 0.95rem;
font-weight: 500;
border: 1px solid transparent;
transition: background-color 0.15s ease-out, color 0.15s ease-out, border-color 0.15s ease-out, transform 0.1s ease-out;
cursor: pointer;
}

.btn-primary {
background: linear-gradient(135deg, var(--gold), var(--gold-soft));
color: var(--black);
}

.btn-primary:hover {
transform: translateY(-1px);
}

.btn-outline {
background-color: transparent;
border-color: rgba(212, 175, 55, 0.6);
color: var(--gold-soft);
}

.btn-outline:hover {
background-color: rgba(212, 175, 55, 0.12);
}

.hero-highlights {
display: flex;
flex-wrap: wrap;
gap: 0.75rem;
font-size: 0.85rem;
color: var(--text-muted);
}

.hero-highlights span {
border-radius: 999px;
border: 1px solid rgba(0, 0, 0, 0.08);
padding: 0.4rem 0.85rem;
background-color: rgba(0, 0, 0, 0.02);
}

.section {
padding: 4rem 0;
background-color: var(--bg-main);
}

.section-dark {
background: radial-gradient(circle at top right, rgba(212, 175, 55, 0.1), transparent 60%), var(--bg-alt);
}

.section h2 {
font-size: 1.7rem;
margin-bottom: 1rem;
color: #1c1c22;
padding-left: 0.85rem;
border-left: 4px solid var(--gold);
}

.section-intro {
max-width: 640px;
color: var(--text-muted);
margin-bottom: 2rem;
}

.grid {
display: grid;
grid-template-columns: repeat(2, minmax(0, 1fr));
gap: 1.5rem;
}

.card {
border-radius: 1rem;
border: 1px solid rgba(0, 0, 0, 0.06);
background: #ffffff;
box-shadow: 0 10px 30px rgba(15, 15, 30, 0.06);
padding: 1.5rem;
}

.card-book {
display: flex;
flex-direction: column;
gap: 0.75rem;
}

.book-link {
display: block;
width: 100%;
}

.book-cover {
width: 100%;
max-width: 220px;
height: 300px;
margin: 0 auto;
border-radius: 0.8rem;
object-fit: cover;
object-position: center;
box-shadow: 0 10px 24px rgba(15, 15, 30, 0.28);
border: 2px solid rgba(0, 0, 0, 0.08);
}

.book-button {
margin-top: 0.25rem;
}

.accordion {
display: flex;
flex-direction: column;
gap: 1rem;
}

.accordion-item {
border-radius: 1rem;
border: 1px solid rgba(0, 0, 0, 0.08);
background-color: #ffffff;
box-shadow: 0 12px 32px rgba(15, 15, 30, 0.06);
overflow: hidden;
}

.accordion-header {
width: 100%;
display: flex;
align-items: center;
justify-content: space-between;
gap: 0.75rem;
padding: 0.9rem 1.4rem;
background: linear-gradient(90deg, #111111, #222222);
color: #fdfdfd;
font-size: 0.95rem;
font-weight: 500;
letter-spacing: 0.04em;
text-transform: uppercase;
border: none;
cursor: pointer;
transition: background-color 0.15s ease-out, transform 0.1s ease-out;
}

.accordion-header span:first-child {
text-align: left;
}

.accordion-header:hover {
transform: translateY(-1px);
background: linear-gradient(90deg, #111111, #333333);
}

.accordion-icon {
display: inline-flex;
align-items: center;
justify-content: center;
width: 1.4rem;
height: 1.4rem;
border-radius: 999px;
background: linear-gradient(135deg, var(--gold), var(--gold-soft));
color: var(--black-soft);
font-weight: 600;
font-size: 0.9rem;
}

.accordion-panel {
padding: 1.3rem 1.4rem 1.4rem;
display: flex;
flex-direction: column;
gap: 0.6rem;
font-size: 0.95rem;
color: var(--text-muted);
}

.accordion-panel[hidden] {
display: none;
}

.accordion-panel h4 {
font-size: 0.98rem;
font-weight: 600;
color: #1f1f25;
margin-top: 0.4rem;
}

.accordion-panel ul {
padding-left: 1.2rem;
}

.accordion-panel li {
margin-bottom: 0.25rem;
}

.card h3 {
font-size: 1.1rem;
margin-bottom: 0.5rem;
color: #1f1f25;
}

.card p {
font-size: 0.95rem;
color: var(--text-muted);
}

.grid-team {
grid-template-columns: repeat(2, minmax(0, 1fr));
}

.profile {
border-radius: 1rem;
border: 1px solid rgba(0, 0, 0, 0.06);
background-color: #ffffff;
box-shadow: 0 10px 30px rgba(15, 15, 30, 0.05);
padding: 1.5rem;
}

.profile h3 {
font-size: 1.1rem;
margin-bottom: 0.4rem;
color: #1f1f25;
}

.profile-role {
font-size: 0.9rem;
color: var(--text-muted);
margin-bottom: 0.6rem;
}

.profile-photo {
width: 120px;
height: 120px;
border-radius: 999px;
object-fit: cover;
object-position: top center;
display: block;
margin: 0 auto 0.75rem;
border: 2px solid rgba(212, 175, 55, 0.7);
box-shadow: 0 8px 20px rgba(15, 15, 30, 0.15);
}

.about-layout {
display: grid;
grid-template-columns: repeat(2, minmax(0, 1fr));
gap: 1.5rem;
color: var(--text-muted);
}

.about-toggle {
display: flex;
flex-direction: column;
gap: 0.75rem;
}

.btn-toggle {
display: inline-flex;
align-items: center;
justify-content: space-between;
gap: 0.75rem;
padding: 0.75rem 1.2rem;
border-radius: 999px;
border: 1px solid rgba(0, 0, 0, 0.12);
background: #ffffff;
color: #1f1f25;
font-size: 0.95rem;
font-weight: 500;
cursor: pointer;
transition: background-color 0.15s ease-out, border-color 0.15s ease-out, transform 0.1s ease-out, box-shadow 0.15s ease-out;
}

.btn-toggle:hover {
background-color: #f7f5f0;
border-color: rgba(212, 175, 55, 0.7);
box-shadow: 0 8px 20px rgba(15, 15, 30, 0.12);
transform: translateY(-1px);
}

.btn-toggle-icon {
display: inline-flex;
align-items: center;
justify-content: center;
width: 1.4rem;
height: 1.4rem;
border-radius: 999px;
background: linear-gradient(135deg, var(--gold), var(--gold-soft));
color: var(--black-soft);
font-weight: 600;
font-size: 0.9rem;
}

.toggle-panel {
border-radius: 1.1rem;
border: 1px solid rgba(0, 0, 0, 0.06);
background-color: #ffffff;
box-shadow: 0 16px 40px rgba(15, 15, 30, 0.12);
padding: 1.5rem 1.4rem;
display: flex;
flex-direction: column;
gap: 0.75rem;
font-size: 0.95rem;
}

.toggle-panel[hidden] {
display: none;
}

.about-cta {
margin-top: 0.5rem;
font-weight: 500;
color: #1f1f25;
}

.about-cta a {
color: var(--gold);
text-decoration: none;
}

.about-cta a:hover {
text-decoration: underline;
}

.contact-layout {
display: block;
}

.contact-info {
font-size: 0.95rem;
color: var(--text-muted);
max-width: 700px;
margin: 0 auto;
text-align: center;
}

.contact-info h3 {
font-size: 1rem;
margin-bottom: 0.5rem;
color: var(--gold-soft);
}

.contact-info p + h3 {
margin-top: 1.5rem;
}

.footer {
border-top: 1px solid rgba(0, 0, 0, 0.06);
background-color: #fdfdfd;
padding: 1rem 0;
}

.footer-content {
display: flex;
flex-wrap: wrap;
align-items: center;
justify-content: space-between;
gap: 0.75rem;
font-size: 0.85rem;
color: var(--text-muted);
}

.footer-links {
display: flex;
gap: 1rem;
}

.footer-links a:hover {
color: var(--gold-soft);
}

@media (max-width: 900px) {
.header-content {
flex-direction: column;
align-items: flex-start;
}
.main-nav {
width: 100%;
flex-wrap: wrap;
}
.hero {
padding-top: 5rem;
}
.hero-content {
flex-direction: column;
align-items: flex-start;
}
.hero-video {
width: 100%;
}
.video-frame {
max-width: 100%;
}
.grid {
grid-template-columns: minmax(0, 1fr);
}
.grid-team {
grid-template-columns: minmax(0, 1fr);
}
.about-layout {
grid-template-columns: minmax(0, 1fr);
}
.contact-layout {
grid-template-columns: minmax(0, 1fr);
}
}

@media (max-width: 600px) {
.brand-name {
font-size: 1rem;
}
.hero h1 {
font-size: 2rem;
}
.section {
padding: 3rem 0;
}
}