/* ========================================
   momintools.tech — Design System
   Colors: #13498a (primary) / #f69946 (accent)
   ======================================== */

/* --- CSS Variables --- */
:root {
    --color-primary: #13498a;
    --color-primary-light: #1a5ba8;
    --color-primary-dark: #0e3768;
    --color-primary-subtle: rgba(19, 73, 138, 0.06);
    --color-accent: #f69946;
    --color-accent-light: #f8ad6a;
    --color-accent-dark: #e8852e;
    --color-accent-subtle: rgba(246, 153, 70, 0.08);

    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fb;
    --bg-tertiary: #f0f2f5;

    --text-primary: #1a1a2e;
    --text-secondary: #555770;
    --text-tertiary: #8b8da3;
    --text-inverse: #ffffff;

    --border-color: rgba(0, 0, 0, 0.06);
    --border-hover: rgba(19, 73, 138, 0.15);

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.08);
    --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.04);
    --shadow-card-hover: 0 8px 30px rgba(19, 73, 138, 0.12);

    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    --font-sans: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);

    --header-height: 64px;
    --container-max: 1100px;
    --container-padding: 24px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

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

/* --- Utility --- */
.sp-only {
    display: none;
}

.pc-only {
    display: inline;
}

/* ========================================
   Header
   ======================================== */
#site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: background var(--transition-fast), box-shadow var(--transition-fast);
}

#site-header.scrolled {
    box-shadow: var(--shadow-sm);
}

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

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    transition: opacity var(--transition-fast);
}

.logo:hover {
    opacity: 0.7;
}

.logo-mark {
    width: 28px;
    height: 28px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-radius: 8px;
    position: relative;
    flex-shrink: 0;
}

.logo-mark::after {
    content: '';
    position: absolute;
    bottom: -2px;
    right: -2px;
    width: 10px;
    height: 10px;
    background: var(--color-accent);
    border-radius: 3px;
}

.logo-text {
    color: var(--text-primary);
}

.logo-accent {
    color: var(--color-primary);
}

/* Navigation */
.global-nav {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-link {
    padding: 8px 16px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast), background var(--transition-fast);
    position: relative;
}

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

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 16px;
    height: 2px;
    background: var(--color-accent);
    border-radius: 2px;
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1100;
}

.mobile-menu-btn span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

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

.mobile-menu-btn.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Nav Overlay */
.mobile-nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 999;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-smooth);
}

.mobile-nav-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.mobile-nav-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.mobile-nav-link {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    padding: 12px 32px;
    border-radius: var(--radius-md);
    transition: color var(--transition-fast), background var(--transition-fast);
}

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

/* ========================================
   Hero Section
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: calc(var(--header-height) + 40px) var(--container-padding) 40px;
    position: relative;
    background: var(--bg-primary);
    overflow: hidden;
}

/* Dot grid background */
.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle, rgba(19, 73, 138, 0.07) 1px, transparent 1px);
    background-size: 24px 24px;
    pointer-events: none;
    mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 20%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 20%, transparent 70%);
}

/* Gradient orbs */
.hero-bg-orb {
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
    filter: blur(80px);
    opacity: 0.5;
}

.hero-bg-orb--1 {
    top: -10%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: rgba(19, 73, 138, 0.08);
}

.hero-bg-orb--2 {
    bottom: -15%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: rgba(246, 153, 70, 0.06);
}

.hero-bg-orb--3 {
    top: 30%;
    left: 60%;
    width: 250px;
    height: 250px;
    background: rgba(19, 73, 138, 0.04);
}

.hero-content {
    text-align: center;
    max-width: 720px;
    position: relative;
    z-index: 1;
}

.hero-eyebrow {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-primary);
    margin-bottom: 20px;
    padding: 6px 16px;
    background: var(--color-primary-subtle);
    border: 1px solid rgba(19, 73, 138, 0.1);
    border-radius: 100px;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.1;
    color: var(--text-primary);
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.15rem);
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 40px;
    font-weight: 400;
}

.hero-cta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    background: var(--color-primary);
    color: var(--text-inverse);
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: 100px;
    transition: transform var(--transition-spring), box-shadow var(--transition-smooth), background var(--transition-fast);
    box-shadow: 0 4px 16px rgba(19, 73, 138, 0.25);
    position: relative;
    overflow: hidden;
}

.hero-cta::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent 40%, rgba(255,255,255,0.15) 50%, transparent 60%);
    transform: translateX(-100%);
    transition: transform 0.6s ease;
}

.hero-cta:hover::before {
    transform: translateX(100%);
}

.hero-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(19, 73, 138, 0.35);
    background: var(--color-primary-light);
}

.hero-cta:active {
    transform: translateY(0);
}

.hero-cta svg {
    transition: transform var(--transition-fast);
}

.hero-cta:hover svg {
    transform: translateY(2px);
}

/* Scroll Indicator */
.hero-scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
}

.scroll-line {
    width: 1px;
    height: 48px;
    background: linear-gradient(to bottom, var(--color-primary), transparent);
    position: relative;
    overflow: hidden;
}

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

@keyframes scrollDown {
    0% { top: -100%; }
    100% { top: 100%; }
}

/* ========================================
   Section commons
   ======================================== */
.section-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-eyebrow {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 12px;
}

.section-title {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.section-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 520px;
    margin: 0 auto;
}

/* ========================================
   Services Section
   ======================================== */
.services {
    padding: 120px 0;
    background: var(--bg-secondary);
    position: relative;
}

.services::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--border-color), transparent);
}

/* Sub-heading for service groups */
.services-group-label {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
    margin-top: 48px;
}

.services-group-label:first-child {
    margin-top: 0;
}

.services-group-label span {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-tertiary);
    white-space: nowrap;
}

.services-group-label::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-color);
}

/* Services Grid */
.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

/* Service Card */
.service-card {
    display: flex;
    flex-direction: column;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 36px 32px;
    transition: transform var(--transition-spring),
                box-shadow var(--transition-smooth),
                border-color var(--transition-fast);
    position: relative;
    overflow: hidden;
}

/* Reveal animation — visible by default, JS adds .will-reveal then .revealed */
.service-card.will-reveal {
    opacity: 0;
    transform: translateY(30px);
}

.service-card.revealed {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.service-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card-hover);
    border-color: var(--border-hover);
}

.service-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(to right, var(--color-primary), var(--color-accent));
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.service-card:hover::after {
    opacity: 1;
}

/* Card tag (Public / Internal) */
.card-tag {
    display: inline-block;
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 3px 10px;
    border-radius: 100px;
    position: absolute;
    top: 16px;
    right: 16px;
}

.card-tag--public {
    background: rgba(19, 73, 138, 0.08);
    color: var(--color-primary);
}

.card-tag--internal {
    background: var(--color-accent-subtle);
    color: var(--color-accent-dark);
}

.card-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary-subtle);
    color: var(--color-primary);
    border-radius: var(--radius-md);
    margin-bottom: 24px;
    transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-spring);
}

.service-card:hover .card-icon {
    background: var(--color-primary);
    color: var(--text-inverse);
    transform: scale(1.05);
}

.card-content {
    flex: 1;
    margin-bottom: 24px;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
    letter-spacing: -0.01em;
}

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

.card-action {
    display: flex;
    align-items: center;
    gap: 4px;
    color: var(--color-primary);
    font-weight: 600;
    font-size: 0.875rem;
    transition: gap var(--transition-fast);
}

.service-card:hover .card-action {
    gap: 8px;
}

.card-action svg {
    transition: transform var(--transition-fast);
}

.service-card:hover .card-action svg {
    transform: translateX(2px);
}

/* Internal card style variation */
.service-card--internal .card-icon {
    background: var(--color-accent-subtle);
    color: var(--color-accent-dark);
}

.service-card--internal:hover .card-icon {
    background: var(--color-accent);
    color: var(--text-inverse);
}

.service-card--internal .card-action {
    color: var(--color-accent-dark);
}

.service-card--internal::after {
    background: linear-gradient(to right, var(--color-accent), var(--color-accent-light));
}

/* ========================================
   About Section
   ======================================== */
.about {
    padding: 120px 0;
    background: var(--bg-primary);
    position: relative;
}

.about::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--border-color), transparent);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 60px;
    max-width: 800px;
    margin: 0 auto;
}

/* Reveal animation — same pattern as cards */
.about-content.will-reveal {
    opacity: 0;
    transform: translateY(30px);
}

.about-content.revealed {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.about-text {
    position: relative;
    padding-left: 28px;
}

.about-text::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(to bottom, var(--color-primary), var(--color-accent));
    border-radius: 3px;
}

.about-text .section-title {
    text-align: left;
}

.about-text .section-eyebrow {
    text-align: left;
}

.about-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.9;
    margin-bottom: 16px;
}

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

/* Stats */
.about-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 32px;
    padding: 40px;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: -0.02em;
    font-variant-numeric: tabular-nums;
}

.stat-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.stat-divider {
    width: 1px;
    height: 48px;
    background: var(--border-color);
}

/* ========================================
   Footer
   ======================================== */
#site-footer {
    background: linear-gradient(180deg, var(--text-primary) 0%, #12122a 100%);
    color: rgba(255, 255, 255, 0.6);
    padding: 64px 0 0;
    position: relative;
}

#site-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(to right, var(--color-primary), var(--color-accent), var(--color-primary));
}

.footer-inner {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.footer-top {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-logo {
    font-size: 1.15rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.95);
}

.footer-logo .logo-accent {
    color: var(--color-accent);
}

.footer-tagline {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.35);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.footer-heading {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: rgba(255, 255, 255, 0.3);
    margin-bottom: 16px;
}

.footer-col {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-link {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.55);
    transition: color var(--transition-fast), transform var(--transition-fast);
    display: inline-block;
}

.footer-link:hover {
    color: var(--color-accent);
    transform: translateX(3px);
}

.footer-bottom {
    padding: 24px 0;
    text-align: center;
}

.copyright {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.25);
}

/* ========================================
   Responsive: Tablet
   ======================================== */
@media (max-width: 900px) {
    .services-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .footer-top {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .footer-links {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ========================================
   Responsive: Mobile
   ======================================== */
@media (max-width: 640px) {
    :root {
        --container-padding: 20px;
        --header-height: 56px;
    }

    .sp-only {
        display: inline;
    }

    .pc-only {
        display: none;
    }

    /* Header */
    .global-nav {
        display: none;
    }

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

    /* Hero */
    .hero {
        min-height: 90vh;
        padding-bottom: 80px;
    }

    .hero-eyebrow {
        font-size: 0.7rem;
    }

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

    .hero-cta {
        padding: 12px 24px;
        font-size: 0.9rem;
    }

    /* Sections */
    .services {
        padding: 80px 0;
    }

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

    .service-card {
        padding: 28px 24px;
    }

    .about {
        padding: 80px 0;
    }

    .about-text {
        padding-left: 20px;
    }

    .about-stats {
        flex-direction: row;
        gap: 20px;
        padding: 28px 20px;
    }

    .stat-number {
        font-size: 1.5rem;
    }

    .stat-divider {
        height: 36px;
    }

    /* Footer */
    .footer-links {
        grid-template-columns: 1fr 1fr;
        gap: 28px;
    }

    .services-group-label {
        margin-top: 32px;
    }
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Page load animation */
.hero-eyebrow {
    animation: fadeInUp 0.6s 0.1s both;
}

.hero-title {
    animation: fadeInUp 0.6s 0.2s both;
}

.hero-subtitle {
    animation: fadeInUp 0.6s 0.3s both;
}

.hero-cta {
    animation: fadeInUp 0.6s 0.4s both;
}

.hero-scroll-indicator {
    animation: fadeInUp 0.6s 0.6s both;
}

/* No-JS fallback: show everything */
noscript ~ main [data-reveal] {
    opacity: 1;
    transform: none;
}