/* ===== CSS Variables ===== */
:root {
    --color-bg: #fafafa;
    --color-bg-secondary: #ffffff;
    --color-text: #171717;
    --color-text-secondary: #525252;
    --color-text-muted: #a3a3a3;
    --color-border: #e5e5e5;
    --color-accent: #171717;
    --color-accent-hover: #404040;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --transition-fast: 0.15s ease;
    --transition-medium: 0.3s ease;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.08);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-fast);
}

ul {
    list-style: none;
}

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(250, 250, 250, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    font-size: 1.1rem;
}

.logo-icon {
    font-size: 1.25rem;
    color: var(--color-accent);
}

.logo-text {
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 8px 16px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-text);
    background: rgba(0, 0, 0, 0.04);
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-btn span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

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

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(250, 250, 250, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 24px;
    z-index: 999;
    opacity: 0;
    transform: translateY(-10px);
    transition: all var(--transition-medium);
}

.mobile-menu.active {
    opacity: 1;
    transform: translateY(0);
}

.mobile-nav-links {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.mobile-nav-link {
    padding: 12px 16px;
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.mobile-nav-link:hover {
    background: rgba(0, 0, 0, 0.04);
    color: var(--color-text);
}

/* ===== Hero Section ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 24px 80px;
    position: relative;
    overflow: hidden;
}

.hero-content {
    max-width: 680px;
    text-align: center;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    padding: 8px 16px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 16px;
}

.hero-subtitle {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    font-weight: 400;
    color: var(--color-text-secondary);
    margin-bottom: 24px;
    letter-spacing: -0.01em;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    max-width: 500px;
    margin: 0 auto 40px;
    line-height: 1.7;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    background: var(--color-accent);
    color: white;
    font-size: 1rem;
    font-weight: 500;
    border-radius: 50px;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-md);
}

.cta-button:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.arrow-icon {
    width: 18px;
    height: 18px;
    transition: transform var(--transition-fast);
}

.cta-button:hover .arrow-icon {
    transform: translateX(4px);
}

/* Hero Visual */
.hero-visual {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.floating-shapes {
    position: absolute;
    inset: 0;
}

.shape {
    position: absolute;
    border-radius: 50%;
    opacity: 0.5;
    filter: blur(60px);
}

.shape-1 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, #e5e5e5 0%, #d4d4d4 100%);
    top: 10%;
    right: 10%;
    animation: float 20s ease-in-out infinite;
}

.shape-2 {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, #f5f5f5 0%, #e5e5e5 100%);
    bottom: 20%;
    left: 5%;
    animation: float 15s ease-in-out infinite reverse;
}

.shape-3 {
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, #fafafa 0%, #e5e5e5 100%);
    top: 40%;
    left: 30%;
    animation: float 18s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(30px, -30px) scale(1.05);
    }
    66% {
        transform: translate(-20px, 20px) scale(0.95);
    }
}

/* ===== Section Common Styles ===== */
.section-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 24px;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-label {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 12px;
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    letter-spacing: -0.02em;
}

/* ===== About Section ===== */
.about {
    padding: 120px 24px;
    background: var(--color-bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-bottom: 60px;
}

.about-card {
    background: var(--color-bg);
    padding: 32px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition-medium);
}

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

.about-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: 20px;
}

.about-icon svg {
    width: 24px;
    height: 24px;
    stroke: var(--color-text);
}

.about-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

.about-card p {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.about-statement {
    text-align: center;
    padding: 40px;
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.about-statement blockquote {
    font-size: clamp(1.1rem, 2.5vw, 1.35rem);
    font-weight: 500;
    color: var(--color-text);
    line-height: 1.6;
    font-style: italic;
    max-width: 700px;
    margin: 0 auto;
}

/* ===== Contact Section ===== */
.contact {
    padding: 120px 24px;
    background: var(--color-bg);
}

.contact-content {
    text-align: center;
    max-width: 500px;
    margin: 0 auto;
}

.contact-text {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 40px;
}

.contact-card {
    display: inline-flex;
    align-items: center;
    gap: 20px;
    padding: 24px 40px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-medium);
}

.contact-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.contact-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent);
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.contact-icon svg {
    width: 24px;
    height: 24px;
    stroke: white;
}

.contact-info {
    text-align: left;
}

.contact-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text-muted);
    margin-bottom: 4px;
}

.contact-email {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text);
    transition: color var(--transition-fast);
}

.contact-email:hover {
    color: var(--color-accent-hover);
}

/* ===== Footer ===== */
.footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: 60px 24px 40px;
}

.footer-container {
    max-width: 1000px;
    margin: 0 auto;
}

.footer-main {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 40px;
    margin-bottom: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--color-border);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.footer-tagline {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.footer-nav {
    display: flex;
    gap: 32px;
}

.footer-nav a {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.copyright {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.footer-email {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

.footer-email:hover {
    color: var(--color-text);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .mobile-menu {
        display: block;
    }

    .hero {
        padding: 100px 20px 60px;
        min-height: auto;
    }

    .hero-description {
        font-size: 1rem;
    }

    .about,
    .contact {
        padding: 80px 20px;
    }

    .about-content {
        grid-template-columns: 1fr;
    }

    .contact-card {
        flex-direction: column;
        text-align: center;
        padding: 32px;
    }

    .contact-info {
        text-align: center;
    }

    .footer-main {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .footer-nav {
        flex-wrap: wrap;
        justify-content: center;
        gap: 20px;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-badge {
        font-size: 0.8rem;
        padding: 6px 14px;
    }

    .cta-button {
        padding: 12px 24px;
        font-size: 0.95rem;
    }

    .about-card {
        padding: 24px;
    }

    .section-header {
        margin-bottom: 40px;
    }
}

/* ===== Smooth Scroll Offset for Fixed Nav ===== */
section[id] {
    scroll-margin-top: 80px;
}

/* ===== Selection ===== */
::selection {
    background: var(--color-accent);
    color: white;
}