/* ============================================
   Agenticore Intelligence — Corporate Website
   Design System: Warm minimalist, Eastern zen
   ============================================ */

/* --- Design Tokens --- */
:root {
    /* Colors — from VI */
    --color-charcoal: #2C2520;
    --color-brown: #5C4A3A;
    --color-warm-gray: #8A7B6B;
    --color-taupe: #B8A99A;
    --color-cream: #F5F0EA;
    --color-warm-white: #FAFAF7;
    --color-sage: #7A8B6F;
    --color-sage-light: #C5CDB8;
    --color-gold: #C4A86B;

    /* Typography */
    --font-serif: 'Cormorant Garamond', 'Noto Serif SC', serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-cn: 'Noto Serif SC', 'PingFang SC', serif;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 3rem;
    --space-xl: 5rem;
    --space-2xl: 8rem;

    /* Layout */
    --container-max: 1200px;
    --nav-height: 72px;

    /* Transitions */
    --ease: cubic-bezier(0.4, 0, 0.2, 1);
    --duration: 0.3s;
}

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

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

body {
    font-family: var(--font-sans);
    color: var(--color-charcoal);
    background: var(--color-warm-white);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

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

/* --- Container --- */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* --- Navigation --- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    z-index: 1000;
    background: rgba(250, 250, 247, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: border-color var(--duration) var(--ease);
}

.nav.scrolled {
    border-bottom-color: rgba(44, 37, 32, 0.08);
}

.nav-inner {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-md);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.logo-mark {
    height: 28px;
    width: auto;
}

.logo-text {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.logo-en {
    font-family: var(--font-sans);
    font-size: 0.6rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-charcoal);
    line-height: 1.2;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.nav-links a {
    font-size: 0.875rem;
    font-weight: 400;
    color: var(--color-brown);
    transition: color var(--duration) var(--ease);
    letter-spacing: 0.02em;
}

.nav-links a:hover {
    color: var(--color-charcoal);
}

.nav-cta {
    padding: 0.5rem 1.25rem;
    border: 1px solid var(--color-charcoal);
    border-radius: 2px;
    font-weight: 500 !important;
    transition: all var(--duration) var(--ease) !important;
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    width: 24px;
    height: 1.5px;
    background: var(--color-charcoal);
    transition: all var(--duration) var(--ease);
}

/* --- Hero --- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--space-2xl) var(--space-md);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.ink-wash {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 60%;
    background: linear-gradient(180deg,
        rgba(184, 169, 154, 0.08) 0%,
        rgba(245, 240, 234, 0.3) 40%,
        transparent 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
}

.enso-container {
    margin-bottom: var(--space-lg);
    display: flex;
    justify-content: center;
}

.enso {
    width: 180px;
    height: auto;
    opacity: 0.85;
}

.hero-title {
    margin-bottom: var(--space-md);
}

.hero-title-cn {
    display: block;
    font-family: var(--font-cn);
    font-size: clamp(1.75rem, 4vw, 2.75rem);
    font-weight: 500;
    letter-spacing: 0.08em;
    color: var(--color-charcoal);
    margin-bottom: 0.5rem;
}

.hero-title-sub {
    display: block;
    font-family: var(--font-cn);
    font-size: clamp(0.95rem, 1.8vw, 1.15rem);
    font-weight: 400;
    color: var(--color-brown);
    letter-spacing: 0.04em;
    margin-bottom: 0.75rem;
}

.hero-title-en {
    display: block;
    font-family: var(--font-serif);
    font-size: clamp(0.9rem, 1.5vw, 1.1rem);
    font-weight: 300;
    font-style: italic;
    color: var(--color-warm-gray);
    letter-spacing: 0.02em;
}

.hero-sub {
    font-size: 1rem;
    color: var(--color-warm-gray);
    max-width: 500px;
    margin: 0 auto var(--space-lg);
    line-height: 1.8;
}

.hero-badge {
    display: inline-block;
}

.badge-text {
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-warm-gray);
    border: 1px solid var(--color-taupe);
    padding: 0.4rem 1.2rem;
    border-radius: 2px;
}

.hero-scroll {
    position: absolute;
    bottom: 3rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-taupe);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    animation: float 2s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(6px); }
}

/* --- Sections --- */
.section {
    padding: var(--space-2xl) 0;
}

.section-label {
    display: block;
    font-size: 0.65rem;
    font-weight: 500;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--color-warm-gray);
    margin-bottom: var(--space-sm);
}

.section-title {
    font-family: var(--font-cn);
    font-size: clamp(1.5rem, 3vw, 2.25rem);
    font-weight: 500;
    color: var(--color-charcoal);
    margin-bottom: var(--space-sm);
    letter-spacing: 0.04em;
    line-height: 1.4;
}

.section-desc {
    font-size: 1rem;
    color: var(--color-warm-gray);
    max-width: 600px;
    margin-bottom: var(--space-xl);
}

/* --- About --- */
.section-about {
    background: var(--color-cream);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1.4fr;
    gap: var(--space-xl);
    align-items: start;
}

.about-lead {
    font-size: 1.05rem;
    line-height: 1.9;
    color: var(--color-brown);
    margin-bottom: var(--space-lg);
}

.about-mission {
    padding: var(--space-md);
    background: var(--color-warm-white);
    border-left: 3px solid var(--color-taupe);
    margin-bottom: var(--space-lg);
}

.about-mission h3 {
    font-family: var(--font-cn);
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    color: var(--color-warm-gray);
    margin-bottom: 0.5rem;
}

.about-mission p {
    font-family: var(--font-cn);
    font-size: 1.1rem;
    font-weight: 400;
    color: var(--color-charcoal);
}

.about-values {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.value-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0.75rem 0;
    border-bottom: 1px solid rgba(44, 37, 32, 0.06);
}

.value-number {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 300;
    color: var(--color-taupe);
    min-width: 2rem;
}

.value-text {
    font-size: 0.95rem;
    color: var(--color-brown);
}

/* --- Services --- */
.services-tabs {
    display: flex;
    gap: 0;
    margin-bottom: var(--space-lg);
    border-bottom: 1px solid rgba(44, 37, 32, 0.1);
}

.tab-btn {
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 400;
    color: var(--color-warm-gray);
    background: none;
    border: none;
    padding: 1rem 1.5rem;
    cursor: pointer;
    position: relative;
    transition: color var(--duration) var(--ease);
}

.tab-btn::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-charcoal);
    transform: scaleX(0);
    transition: transform var(--duration) var(--ease);
}

.tab-btn.active {
    color: var(--color-charcoal);
    font-weight: 500;
}

.tab-btn.active::after {
    transform: scaleX(1);
}

.tab-btn:hover {
    color: var(--color-charcoal);
}

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
    animation: fadeIn 0.4s var(--ease);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.service-card {
    padding: var(--space-lg) var(--space-md);
    background: var(--color-cream);
    border-radius: 4px;
    transition: all var(--duration) var(--ease);
    border: 1px solid transparent;
}

.service-card:hover {
    background: var(--color-warm-white);
    border-color: var(--color-taupe);
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(44, 37, 32, 0.06);
}

.service-icon {
    width: 40px;
    height: 40px;
    margin-bottom: var(--space-sm);
    color: var(--color-warm-gray);
}

.service-icon svg {
    width: 100%;
    height: 100%;
}

.service-card h4 {
    font-family: var(--font-cn);
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--color-charcoal);
}

.service-card p {
    font-size: 0.85rem;
    color: var(--color-warm-gray);
    line-height: 1.7;
}

/* --- Strategy --- */
.section-strategy {
    background: var(--color-cream);
}

.strategy-visual {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--space-lg);
    align-items: center;
    margin-top: var(--space-xl);
}

.strategy-wing {
    padding: var(--space-lg);
    background: var(--color-warm-white);
    border-radius: 4px;
    border: 1px solid rgba(44, 37, 32, 0.06);
}

.wing-header {
    margin-bottom: var(--space-sm);
}

.wing-label {
    font-size: 0.65rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-taupe);
}

.wing-header h3 {
    font-family: var(--font-cn);
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--color-charcoal);
    margin-top: 0.25rem;
}

.strategy-wing > p {
    font-size: 0.85rem;
    color: var(--color-warm-gray);
    line-height: 1.8;
    margin-bottom: var(--space-sm);
}

.wing-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.wing-list li {
    font-size: 0.75rem;
    color: var(--color-brown);
    padding: 0.3rem 0.75rem;
    background: var(--color-cream);
    border-radius: 2px;
}

.strategy-core {
    display: flex;
    align-items: center;
    justify-content: center;
}

.core-circle {
    position: relative;
    width: 200px;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.core-enso {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    opacity: 0.85;
}

.core-text {
    text-align: center;
    z-index: 1;
}

.core-label {
    font-size: 0.6rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-taupe);
}

.core-text h3 {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-charcoal);
    line-height: 1.5;
    margin-top: 0.25rem;
}

/* --- Business Model --- */
.model-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
}

.model-card {
    padding: var(--space-lg) var(--space-md);
    border-top: 2px solid var(--color-taupe);
    transition: border-color var(--duration) var(--ease);
}

.model-card:hover {
    border-top-color: var(--color-charcoal);
}

.model-number {
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 300;
    color: var(--color-taupe);
    margin-bottom: var(--space-sm);
}

.model-card h4 {
    font-family: var(--font-cn);
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-charcoal);
    margin-bottom: 0.75rem;
}

.model-card p {
    font-size: 0.85rem;
    color: var(--color-warm-gray);
    line-height: 1.7;
}

/* --- Vision --- */
.section-vision {
    background: var(--color-charcoal);
    color: var(--color-warm-white);
    position: relative;
    overflow: hidden;
}

.section-vision .section-label {
    color: var(--color-taupe);
}

.vision-title {
    font-family: var(--font-cn);
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 400;
    color: var(--color-warm-white);
    margin-bottom: var(--space-xl);
    letter-spacing: 0.04em;
    line-height: 1.5;
}

.vision-content {
    position: relative;
    z-index: 1;
}

.vision-timeline {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
    padding-left: var(--space-lg);
    border-left: 1px solid rgba(184, 169, 154, 0.3);
}

.timeline-item {
    position: relative;
}

.timeline-dot {
    position: absolute;
    left: calc(-1 * var(--space-lg) - 4px);
    top: 0.5rem;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-taupe);
}

.timeline-phase {
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-taupe);
    display: block;
    margin-bottom: 0.25rem;
}

.timeline-content p {
    font-size: 0.95rem;
    color: rgba(250, 250, 247, 0.8);
    line-height: 1.7;
}

.vision-decoration {
    position: absolute;
    right: -50px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-warm-white);
}

.vision-enso {
    width: 300px;
    height: 300px;
}

/* --- CTA --- */
.section-cta {
    text-align: center;
    padding: var(--space-2xl) 0;
    background: var(--color-cream);
}

.cta-content h2 {
    font-family: var(--font-cn);
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 500;
    color: var(--color-charcoal);
    margin-bottom: var(--space-sm);
    line-height: 1.5;
}

.cta-content p {
    font-size: 1rem;
    color: var(--color-warm-gray);
    margin-bottom: var(--space-lg);
}

.btn {
    display: inline-block;
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    padding: 0.875rem 2.5rem;
    border: none;
    border-radius: 2px;
    cursor: pointer;
    transition: all var(--duration) var(--ease);
}

.btn-primary {
    background: var(--color-charcoal);
    color: var(--color-warm-white);
}

.btn-primary:hover {
    background: var(--color-brown);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(44, 37, 32, 0.2);
}

.btn-full {
    width: 100%;
}

/* --- Contact --- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--space-xl);
    align-items: start;
}

.contact-desc {
    font-size: 0.95rem;
    color: var(--color-warm-gray);
    line-height: 1.8;
    margin-bottom: var(--space-lg);
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.contact-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.contact-label {
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-warm-gray);
}

.contact-item a {
    font-size: 0.95rem;
    color: var(--color-charcoal);
    transition: color var(--duration) var(--ease);
}

.contact-item a:hover {
    color: var(--color-brown);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-sm);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.form-group label {
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    color: var(--color-brown);
}

.form-group input,
.form-group select,
.form-group textarea {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    padding: 0.75rem 1rem;
    border: 1px solid rgba(44, 37, 32, 0.12);
    border-radius: 2px;
    background: var(--color-warm-white);
    color: var(--color-charcoal);
    transition: border-color var(--duration) var(--ease);
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--color-taupe);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-group select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238A7B6B' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
}

/* --- Footer --- */
.footer {
    background: var(--color-charcoal);
    color: rgba(250, 250, 247, 0.7);
    padding: var(--space-xl) 0 var(--space-lg);
}

.footer-top {
    display: flex;
    justify-content: space-between;
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid rgba(250, 250, 247, 0.08);
    margin-bottom: var(--space-lg);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.footer-logo {
    height: 30px;
    width: auto;
    filter: brightness(0) invert(1);
    opacity: 0.9;
}

.footer-brand-text {
    display: flex;
    flex-direction: column;
}

.footer-name-en {
    font-size: 0.6rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-warm-white);
}

.footer-name-cn {
    font-family: var(--font-cn);
    font-size: 0.8rem;
    color: var(--color-taupe);
    margin-top: 0.15rem;
}

.footer-links {
    display: flex;
    gap: var(--space-xl);
}

.footer-col {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-col h5 {
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-warm-white);
    margin-bottom: 0.5rem;
}

.footer-col a {
    font-size: 0.85rem;
    color: rgba(250, 250, 247, 0.6);
    transition: color var(--duration) var(--ease);
}

.footer-col a:hover {
    color: var(--color-warm-white);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: rgba(250, 250, 247, 0.4);
}

.footer-slogan {
    font-family: var(--font-cn);
    font-size: 0.8rem;
    color: rgba(250, 250, 247, 0.3);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .about-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

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

    .strategy-visual {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    .strategy-core {
        order: -1;
    }

    .core-circle {
        width: 150px;
        height: 150px;
    }

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

    .contact-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    .footer-top {
        flex-direction: column;
        gap: var(--space-lg);
    }
}

@media (max-width: 768px) {
    :root {
        --space-xl: 3.5rem;
        --space-2xl: 5rem;
    }

    .nav-links {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: var(--color-warm-white);
        flex-direction: column;
        padding: var(--space-lg) var(--space-md);
        gap: var(--space-md);
        border-bottom: 1px solid rgba(44, 37, 32, 0.08);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: all var(--duration) var(--ease);
    }

    .nav-links.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(4px, 4px);
    }

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

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(4px, -4px);
    }

    .services-grid {
        grid-template-columns: 1fr;
    }

    .services-tabs {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .tab-btn {
        white-space: nowrap;
        padding: 0.75rem 1rem;
        font-size: 0.8rem;
    }

    .model-grid {
        grid-template-columns: 1fr;
    }

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

    .footer-links {
        flex-direction: column;
        gap: var(--space-lg);
    }

    .footer-bottom {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }

    .hero {
        min-height: 90vh;
    }

    .enso {
        width: 130px;
        height: auto;
    }

    .vision-decoration {
        display: none;
    }
}

@media (max-width: 480px) {
    .hero-title-cn {
        font-size: 1.5rem;
    }

    .section-title {
        font-size: 1.35rem;
    }
}

/* --- Scroll animations --- */
.fade-up {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

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