/* ============================================
   alvavinci LLC — Landing Page Styles
   Premium, minimal, holding company aesthetic
   ============================================ */

/* --- CSS Variables --- */
:root {
    --color-bg: #fafafa;
    --color-bg-alt: #f2f1ef;
    --color-text: #1e1a2e;
    --color-text-secondary: #46434f;
    --color-primary: #2d2150;
    --color-accent: #574a80;
    --color-accent-light: rgba(87, 74, 128, 0.1);
    --color-border: #dddae4;
    --color-white: #ffffff;

    --font-serif: 'Playfair Display', Georgia, serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

    --max-width: 1120px;
    --section-padding: 140px;
    --header-height: 72px;

    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

ul {
    list-style: none;
}

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

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

/* --- Layout --- */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 40px;
}

/* ============================================
   Header
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    z-index: 1000;
    transition: var(--transition);
    background: rgba(250, 250, 250, 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.header.scrolled {
    box-shadow: 0 1px 0 var(--color-border);
}

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

/* Logo */
.logo {
    font-family: var(--font-serif);
    font-size: 1.4rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    color: var(--color-primary);
}

/* Navigation */
.nav-list {
    display: flex;
    align-items: center;
    gap: 36px;
}

.nav-link {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    letter-spacing: 0.3px;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-primary);
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--color-primary);
}

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

.nav-link--cta {
    padding: 8px 24px;
    border: 1px solid var(--color-primary);
    color: var(--color-primary);
    font-weight: 500;
}

.nav-link--cta::after {
    display: none;
}

.nav-link--cta:hover {
    background: var(--color-primary);
    color: var(--color-white);
}

/* Hamburger */
.hamburger {
    display: none;
    width: 28px;
    height: 20px;
    position: relative;
    z-index: 1001;
}

.hamburger span {
    display: block;
    position: absolute;
    width: 100%;
    height: 1.5px;
    background: var(--color-primary);
    transition: var(--transition);
}

.hamburger span:nth-child(1) { top: 0; }
.hamburger span:nth-child(2) { top: 9px; }
.hamburger span:nth-child(3) { top: 18px; }

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

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

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.5px;
    padding: 14px 40px;
    transition: var(--transition);
    cursor: pointer;
}

.btn--primary {
    background: var(--color-primary);
    color: var(--color-white);
    border: 1px solid var(--color-primary);
}

.btn--primary:hover {
    background: transparent;
    color: var(--color-primary);
}

.btn--full {
    display: block;
    width: 100%;
    text-align: center;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    min-height: 100vh;
    position: relative;
}

.hero-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    min-height: 100vh;
    width: 100%;
    padding-top: var(--header-height);
}

.hero-content {
    padding: 80px 40px;
    padding-left: max(40px, calc((100vw - var(--max-width)) / 2));
    position: relative;
    z-index: 2;
}

.hero-visual {
    position: relative;
    width: 100%;
    height: 100%;
    min-height: 500px;
}

#heroCanvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.hero-label {
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 32px;
}

.hero-title {
    font-family: var(--font-serif);
    font-size: clamp(2.4rem, 5vw, 3.8rem);
    font-weight: 400;
    line-height: 1.25;
    color: var(--color-primary);
    margin-bottom: 28px;
    letter-spacing: -0.5px;
}

.hero-description {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    max-width: 540px;
    margin-bottom: 48px;
}

/* Scroll Indicator */
.hero-scroll {
    position: absolute;
    bottom: 48px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.hero-scroll span {
    font-size: 0.7rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--color-text-secondary);
}

.hero-scroll-line {
    width: 1px;
    height: 48px;
    background: var(--color-border);
    position: relative;
    overflow: hidden;
}

.hero-scroll-line::after {
    content: '';
    position: absolute;
    top: -100%;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-accent);
    animation: scrollLine 2s ease-in-out infinite;
}

@keyframes scrollLine {
    0% { top: -100%; }
    50% { top: 100%; }
    100% { top: 100%; }
}

/* ============================================
   Section Common
   ============================================ */
.section {
    padding: var(--section-padding) 0;
}

.section--alt {
    background-color: var(--color-bg-alt);
}

.section-header {
    margin-bottom: 72px;
}

.section-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 16px;
}

.section-title {
    font-family: var(--font-serif);
    font-size: clamp(1.8rem, 3.5vw, 2.6rem);
    font-weight: 400;
    color: var(--color-primary);
    letter-spacing: -0.3px;
}

/* ============================================
   About Section
   ============================================ */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
}

.about-text p {
    font-size: 1rem;
    color: var(--color-text-secondary);
    line-height: 1.9;
    margin-bottom: 20px;
}

.about-text p:last-child {
    margin-bottom: 0;
}

.about-principles {
    display: flex;
    flex-direction: column;
    gap: 36px;
}

.principle {
    padding-left: 24px;
    border-left: 2px solid var(--color-accent);
}

.principle h3 {
    font-family: var(--font-sans);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 8px;
}

.principle p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ============================================
   Business Section
   ============================================ */
.business-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.business-card {
    padding: 40px 32px;
    background: var(--color-white);
    border: 1px solid var(--color-border);
    transition: var(--transition);
    position: relative;
}

.business-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.06);
}

.business-card--future {
    border-style: dashed;
}

.business-card--link {
    display: block;
    cursor: pointer;
}

.business-card--link:hover .business-card-link-label {
    color: var(--color-accent);
}

.business-card-link-label {
    display: inline-block;
    margin-top: 16px;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--color-primary);
    letter-spacing: 0.3px;
    transition: var(--transition);
}

.business-card-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    color: var(--color-accent);
}

.business-card-title {
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.business-card-text {
    font-size: 0.88rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.business-card-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--color-accent);
    padding: 4px 12px;
    border: 1px solid var(--color-accent);
}

/* ============================================
   Group Structure Section
   ============================================ */
.group-structure {
    max-width: 720px;
    margin: 0 auto;
}

.group-parent {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.group-node {
    padding: 32px 40px;
    border: 1px solid var(--color-border);
    background: var(--color-white);
    text-align: center;
    transition: var(--transition);
}

.group-node:hover {
    border-color: var(--color-accent);
}

.group-node--parent {
    border: 2px solid var(--color-primary);
    background: var(--color-primary);
    color: var(--color-white);
    min-width: 280px;
}

.group-node--parent:hover {
    border-color: var(--color-primary);
}

.group-node h3 {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.group-node p {
    font-size: 0.85rem;
    opacity: 0.7;
}

.group-node ul {
    margin-top: 8px;
}

.group-node ul li {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    padding: 2px 0;
}

.group-connector {
    width: 1px;
    height: 48px;
    background: var(--color-border);
    position: relative;
}

.group-connector::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: -20px;
    width: 41px;
    height: 1px;
    background: var(--color-border);
}

.group-children {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    position: relative;
}

.group-children::before {
    content: '';
    position: absolute;
    top: 0;
    left: 25%;
    width: 50%;
    height: 1px;
    background: var(--color-border);
}

.group-child {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.group-child::before {
    content: '';
    width: 1px;
    height: 32px;
    background: var(--color-border);
}

.group-child .group-node {
    width: 100%;
}

/* ============================================
   Vision Section
   ============================================ */
.vision-statement {
    margin-bottom: 72px;
}

.vision-lead {
    font-family: var(--font-serif);
    font-size: clamp(1.3rem, 2.5vw, 1.7rem);
    font-weight: 400;
    line-height: 1.6;
    color: var(--color-primary);
    max-width: 680px;
}

.vision-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px 80px;
}

.vision-item {
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
}

.vision-number {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: 1px;
    margin-bottom: 12px;
    display: block;
}

.vision-item h3 {
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 10px;
}

.vision-item p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ============================================
   Message Section
   ============================================ */
.message-content {
    max-width: 680px;
}

.message-quote {
    padding-left: 32px;
    border-left: 2px solid var(--color-accent);
}

.message-quote p {
    font-size: 1rem;
    color: var(--color-text-secondary);
    line-height: 2;
    margin-bottom: 24px;
}

.message-quote p:last-child {
    margin-bottom: 0;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: 64px 0 40px;
    border-top: 1px solid var(--color-border);
}

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

.footer-logo {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-primary);
}

.footer-tagline {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    margin-top: 8px;
}

.footer-nav ul {
    display: flex;
    gap: 32px;
    flex-wrap: wrap;
    justify-content: center;
}

.footer-nav a {
    font-size: 0.82rem;
    color: var(--color-text-secondary);
    letter-spacing: 0.3px;
}

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

.footer-copyright {
    font-size: 0.78rem;
    color: var(--color-text-secondary);
    margin-top: 16px;
}

/* ============================================
   Animations
   ============================================ */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.8s var(--transition-slow),
                transform 0.8s var(--transition-slow);
}

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

.delay-1 { transition-delay: 0.15s; }
.delay-2 { transition-delay: 0.3s; }
.delay-3 { transition-delay: 0.45s; }

/* ============================================
   Reduced Motion
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    .hero-visual {
        display: none;
    }

    .hero-inner {
        grid-template-columns: 1fr;
    }

    .fade-in {
        opacity: 1;
        transform: none;
        transition: none;
    }
}

/* ============================================
   Responsive — Tablet
   ============================================ */
@media (max-width: 1024px) {
    :root {
        --section-padding: 100px;
    }

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

    .vision-grid {
        gap: 36px 48px;
    }
}

/* ============================================
   Responsive — Mobile
   ============================================ */
@media (max-width: 768px) {
    :root {
        --section-padding: 80px;
        --header-height: 60px;
    }

    .container {
        padding: 0 24px;
    }

    .hide-mobile {
        display: none;
    }

    /* Header Mobile */
    .hamburger {
        display: block;
    }

    .nav {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: var(--color-bg);
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
        display: flex;
        align-items: center;
        justify-content: center;
        opacity: 0;
        pointer-events: none;
        visibility: hidden;
        transition: var(--transition);
    }

    .nav.active {
        opacity: 1;
        pointer-events: all;
        visibility: visible;
    }

    .nav-list {
        flex-direction: column;
        align-items: center;
        gap: 32px;
    }

    .nav-link {
        font-size: 1.1rem;
    }

    .nav-link--cta {
        padding: 12px 36px;
    }

    /* Hero Mobile */
    .hero-inner {
        grid-template-columns: 1fr;
        position: relative;
    }

    .hero-visual {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        opacity: 0.15;
        min-height: 0;
    }

    .hero-content {
        position: relative;
        z-index: 2;
        padding-left: 24px;
    }

    .hero-title {
        font-size: clamp(2rem, 7vw, 2.8rem);
    }

    .hero-description {
        font-size: 0.95rem;
    }

    .hero-scroll {
        display: none;
    }

    /* About Mobile */
    .about-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    /* Business Mobile */
    .business-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .business-card {
        padding: 32px 24px;
    }

    /* Group Mobile */
    .group-children {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .group-children::before {
        display: none;
    }

    .group-child::before {
        height: 24px;
    }

    .group-connector::after {
        display: none;
    }

    /* Vision Mobile */
    .vision-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .vision-lead {
        font-size: 1.2rem;
    }

    /* Footer Mobile */
    .footer-nav ul {
        gap: 20px;
    }
}

/* ============================================
   Responsive — Small Mobile
   ============================================ */
@media (max-width: 480px) {
    .hero-title {
        font-size: 1.8rem;
    }

    .section-title {
        font-size: 1.6rem;
    }

    .btn {
        padding: 12px 32px;
        font-size: 0.82rem;
    }
}

/* ============================================
   M&A Page — Japanese font override
   ============================================ */
.ma-page {
    font-family: 'Noto Sans JP', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* M&A Hero */
.ma-hero {
    padding-top: calc(var(--header-height) + 80px);
    padding-bottom: 80px;
    border-bottom: 1px solid var(--color-border);
}

.ma-hero-label {
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 3px;
    color: var(--color-accent);
    margin-bottom: 24px;
}

.ma-hero-title {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 20px;
    letter-spacing: 0.5px;
}

.ma-hero-description {
    font-size: 1rem;
    color: var(--color-text-secondary);
    line-height: 1.9;
}

/* M&A List */
.ma-list {
    max-width: 640px;
}

.ma-list-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 20px 0;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.95rem;
    color: var(--color-text);
    line-height: 1.7;
}

.ma-list-item:first-child {
    border-top: 1px solid var(--color-border);
}

.ma-list-icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
    margin-top: 2px;
}

/* M&A Two Column Layout */
.ma-two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
}

/* M&A Features */
.ma-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.ma-feature {
    padding: 36px 28px;
    border: 1px solid var(--color-border);
    background: var(--color-white);
}

.ma-feature h3 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 12px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--color-accent);
}

.ma-feature p {
    font-size: 0.88rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

/* M&A Contact */
.ma-contact {
    text-align: center;
    max-width: 480px;
    margin: 0 auto;
}

.ma-contact .section-title {
    margin-bottom: 20px;
}

.ma-contact-text {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 32px;
}

.ma-contact-email {
    display: block;
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--color-primary);
    margin-bottom: 32px;
}

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

/* Form CTA button */
.btn--form {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 48px;
    font-size: 0.9rem;
}

.btn--form svg {
    flex-shrink: 0;
    transition: var(--transition);
}

.btn--form:hover svg {
    stroke: var(--color-primary);
}

/* ============================================
   Corporate Development Page
   ============================================ */

/* Hero sub-description */
.cd-hero-sub {
    font-size: 0.92rem;
    color: var(--color-text-secondary);
    line-height: 1.9;
    margin-top: 16px;
    margin-bottom: 40px;
    max-width: 560px;
}

/* Philosophy section */
.cd-philosophy {
    max-width: 720px;
}

.cd-philosophy-quote {
    padding-left: 32px;
    border-left: 2px solid var(--color-accent);
}

.cd-philosophy-quote p {
    font-size: 1rem;
    color: var(--color-text-secondary);
    line-height: 2;
    margin-bottom: 20px;
}

.cd-philosophy-quote p:last-child {
    margin-bottom: 0;
}

/* Section intro text */
.cd-intro {
    max-width: 680px;
    margin-bottom: 56px;
}

.cd-intro p {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.9;
}

/* 2x2 grid for activities */
.cd-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
}

/* Process steps */
.cd-steps {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px 80px;
}

.cd-step {
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
}

.cd-step-number {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: 1px;
    margin-bottom: 12px;
    display: block;
}

.cd-step h3 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 10px;
}

.cd-step p {
    font-size: 0.88rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

/* M&A/CD Responsive — Tablet */
@media (max-width: 1024px) {
    .ma-features {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .cd-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

/* M&A/CD Responsive — Mobile */
@media (max-width: 768px) {
    .ma-hero {
        padding-top: calc(var(--header-height) + 48px);
        padding-bottom: 48px;
    }

    .ma-hero-title {
        font-size: clamp(1.5rem, 6vw, 2rem);
    }

    .ma-two-col {
        grid-template-columns: 1fr;
        gap: 64px;
    }

    .cd-steps {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .cd-hero-sub {
        margin-bottom: 32px;
    }
}