/* ========================================
   リセット & 基本設定
   ======================================== */

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

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

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    font-weight: 400;
    letter-spacing: -0.01em;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

ul {
    list-style: none;
}

/* ========================================
   カラーシステム（Linearスタイル）
   ======================================== */

:root {
    /* Background Colors */
    --color-bg-primary: #FCFCFC;
    --color-bg-secondary: #FFFFFF;
    --color-bg-tertiary: #F7F7F7;
    --color-bg-elevated: #FEFEFE;
    --color-bg-dark: #0F0F0F;
    --color-bg-dark-secondary: #1A1A1A;

    /* Text Colors */
    --color-text-primary: #0A0A0A;
    --color-text-secondary: #666666;
    --color-text-tertiary: #999999;
    --color-text-quaternary: #CCCCCC;
    --color-text-inverse: #FAFAFA;

    /* Border Colors */
    --color-border-primary: #E5E5E5;
    --color-border-secondary: #F0F0F0;
    --color-border-subtle: #FAFAFA;

    /* Accent Colors */
    --color-accent: #0A0A0A;
    --color-accent-hover: #2A2A2A;
    --color-accent-light: #F5F5F5;

    /* Spacing System */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    --space-32: 8rem;

    /* Typography Scale */
    --font-size-micro: 0.6875rem;
    --font-size-xs: 0.8125rem;
    --font-size-sm: 0.9375rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.0625rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3.5rem;
    --font-size-6xl: 4.5rem;

    /* Line Heights */
    --line-height-tight: 1.2;
    --line-height-snug: 1.35;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.65;
    --line-height-loose: 1.8;

    /* Font Weights */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.16, 1, 0.3, 1);
    --transition-slow: 400ms cubic-bezier(0.16, 1, 0.3, 1);

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-full: 9999px;
}

/* ========================================
   タイポグラフィ
   ======================================== */

.text-micro { font-size: var(--font-size-micro); }
.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-base { font-size: var(--font-size-base); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }

.font-normal { font-weight: var(--font-weight-normal); }
.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }

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

/* ========================================
   共通ユーティリティ
   ======================================== */

.container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.container-wide {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

@media (min-width: 768px) {
    .container,
    .container-wide {
        padding: 0 var(--space-8);
    }
}

@media (min-width: 1024px) {
    .container,
    .container-wide {
        padding: 0 var(--space-12);
    }
}

/* ========================================
   ヘッダー
   ======================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(252, 252, 252, 0.7);
    backdrop-filter: saturate(180%) blur(24px);
    -webkit-backdrop-filter: saturate(180%) blur(24px);
    border-bottom: 1px solid var(--color-border-secondary);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.header.scrolled {
    background-color: rgba(252, 252, 252, 0.85);
    border-bottom-color: var(--color-border-primary);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.header__inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

@media (min-width: 768px) {
    .header__inner {
        padding: 0 var(--space-8);
        height: 64px;
    }
}

.header__logo {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    letter-spacing: -0.02em;
    color: var(--color-text-primary);
    transition: opacity var(--transition-fast);
}

.header__logo:hover {
    opacity: 0.7;
}

.nav__list {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}

.nav__item a {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
    letter-spacing: -0.01em;
}

.nav__item a:hover {
    color: var(--color-text-primary);
}

.nav__item--cta a {
    background-color: var(--color-accent);
    color: var(--color-text-inverse);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.nav__item--cta a:hover {
    background-color: var(--color-accent-hover);
}

.header__hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-2);
    z-index: 1001;
}

.header__hamburger span {
    width: 22px;
    height: 2px;
    background-color: var(--color-text-primary);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 2px;
}

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

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

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

/* ========================================
   ヒーローセクション
   ======================================== */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-20) var(--space-6);
    background: radial-gradient(ellipse at top, var(--color-bg-secondary) 0%, var(--color-bg-primary) 100%);
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, var(--color-border-primary) 50%, transparent 100%);
    opacity: 0.5;
}

@media (min-width: 768px) {
    .hero {
        padding: var(--space-32) var(--space-8);
    }
}

.hero__content {
    max-width: 920px;
    text-align: center;
}

.hero__title {
    font-size: clamp(var(--font-size-3xl), 7vw, var(--font-size-6xl));
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
    letter-spacing: -0.045em;
    color: var(--color-text-primary);
    margin-bottom: var(--space-8);
}

.hero__description {
    font-size: clamp(var(--font-size-base), 2vw, var(--font-size-lg));
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-10);
    letter-spacing: -0.01em;
}

.hero__actions {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    flex-wrap: wrap;
}

/* ========================================
   ボタン
   ======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3) var(--space-8);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    letter-spacing: -0.005em;
    border-radius: var(--radius-full);
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    cursor: pointer;
    border: none;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.15);
    transform: translate(-50%, -50%);
    transition: width 0.6s ease, height 0.6s ease;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn--primary {
    background-color: var(--color-accent);
    color: var(--color-text-inverse);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
}

.btn--primary:hover {
    background-color: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.12), 0 2px 4px rgba(0, 0, 0, 0.08);
}

.btn--primary:active {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
}

.btn--secondary {
    background-color: var(--color-bg-secondary);
    color: var(--color-text-primary);
    border: 1.5px solid var(--color-border-primary);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.btn--secondary:hover {
    background-color: var(--color-bg-elevated);
    border-color: var(--color-text-tertiary);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.06);
}

.btn--secondary:active {
    background-color: var(--color-bg-tertiary);
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
}

/* ========================================
   セクション
   ======================================== */

.section {
    padding: clamp(var(--space-20), 12vw, var(--space-32)) 0;
}

.section--dark {
    background-color: var(--color-bg-dark);
    color: var(--color-text-inverse);
}

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

.section__header {
    text-align: center;
    margin-bottom: clamp(var(--space-12), 8vw, var(--space-20));
}

.section__title {
    font-size: clamp(var(--font-size-2xl), 4vw, var(--font-size-4xl));
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
    letter-spacing: -0.04em;
    margin-bottom: var(--space-6);
    color: var(--color-text-primary);
}

.section__subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    letter-spacing: -0.01em;
    max-width: 700px;
    margin: 0 auto;
}

.section--dark .section__subtitle {
    color: var(--color-text-tertiary);
}

/* ========================================
   About
   ======================================== */

.about__content {
    max-width: 800px;
    margin: 0 auto;
}

.about__text {
    font-size: var(--font-size-lg);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-6);
    letter-spacing: -0.01em;
}

.about__highlight {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-medium);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-primary);
    padding: clamp(var(--space-6), 3vw, var(--space-10));
    background: linear-gradient(135deg, var(--color-bg-elevated) 0%, var(--color-bg-tertiary) 100%);
    border-left: 4px solid var(--color-accent);
    border-radius: var(--radius-md);
    margin-top: var(--space-12);
    letter-spacing: -0.02em;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

/* ========================================
   Service
   ======================================== */

.service__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2px;
    background-color: var(--color-border-secondary);
    padding: 2px;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

@media (min-width: 640px) {
    .service__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.service-card {
    background-color: var(--color-bg-elevated);
    padding: var(--space-10);
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

@media (min-width: 768px) {
    .service-card {
        padding: clamp(var(--space-10), 3vw, var(--space-16));
    }
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at top left, rgba(0, 0, 0, 0.02) 0%, transparent 60%);
    opacity: 0;
    transition: opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
}

.service-card::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 1px;
    background: linear-gradient(135deg, transparent 0%, var(--color-border-primary) 100%);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.service-card:hover {
    background-color: var(--color-bg-secondary);
    transform: translateY(-2px);
}

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

.service-card__label {
    font-size: var(--font-size-micro);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: var(--space-6);
    display: inline-block;
}

.service-card__title {
    font-size: clamp(var(--font-size-xl), 2.5vw, var(--font-size-2xl));
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
    letter-spacing: -0.03em;
    margin-bottom: var(--space-5);
    color: var(--color-text-primary);
}

.service-card__description {
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-6);
}

.service-card__list {
    margin-bottom: var(--space-6);
}

.service-card__list-item {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    padding: var(--space-2) 0;
    padding-left: var(--space-5);
    position: relative;
}

.service-card__list-item::before {
    content: '·';
    position: absolute;
    left: var(--space-2);
    color: var(--color-text-tertiary);
    font-size: var(--font-size-lg);
}

.service-card__detail {
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-tertiary);
    padding-top: var(--space-6);
    border-top: 1px solid var(--color-border-secondary);
}

/* ========================================
   Strengths
   ======================================== */

.strengths__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1px;
    background-color: var(--color-bg-dark-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

@media (min-width: 640px) {
    .strengths__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .strengths__grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.strength-card {
    background-color: var(--color-bg-dark);
    padding: var(--space-8);
}

@media (min-width: 768px) {
    .strength-card {
        padding: var(--space-10);
    }
}

.strength-card__number {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-semibold);
    color: rgba(255, 255, 255, 0.15);
    line-height: 1;
    margin-bottom: var(--space-4);
    letter-spacing: -0.04em;
    font-variant-numeric: tabular-nums;
}

.strength-card__title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-snug);
    margin-bottom: var(--space-3);
    letter-spacing: -0.02em;
}

.strength-card__description {
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-tertiary);
}

/* ========================================
   Problems
   ======================================== */

.problems__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-3);
    margin-bottom: var(--space-12);
}

@media (min-width: 640px) {
    .problems__grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-4);
    }
}

@media (min-width: 1024px) {
    .problems__grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
}

.problem-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
    padding: var(--space-6) var(--space-8);
    background: linear-gradient(135deg, var(--color-bg-elevated) 0%, var(--color-bg-secondary) 100%);
    border: 1px solid var(--color-border-secondary);
    border-radius: var(--radius-lg);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
}

.problem-item::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.8) 0%, rgba(255, 255, 255, 0.2) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.problem-item:hover {
    border-color: var(--color-border-primary);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08), 0 2px 6px rgba(0, 0, 0, 0.04);
    transform: translateY(-4px);
}

.problem-item:hover::before {
    opacity: 1;
}

.problem-item__check {
    font-size: var(--font-size-base);
    color: var(--color-accent);
    flex-shrink: 0;
}

.problem-item__text {
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
}

.problems__footer {
    text-align: center;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
}

/* ========================================
   FAQ
   ======================================== */

.faq__list {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.faq-item {
    padding: clamp(var(--space-6), 3vw, var(--space-10));
    background: linear-gradient(135deg, var(--color-bg-elevated) 0%, var(--color-bg-secondary) 100%);
    border: 1px solid var(--color-border-secondary);
    border-radius: var(--radius-lg);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    overflow: hidden;
}

.faq-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.6), transparent);
    transition: left 0.6s ease;
}

.faq-item:hover::before {
    left: 100%;
}

.faq-item:hover {
    border-color: var(--color-border-primary);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06), 0 1px 3px rgba(0, 0, 0, 0.04);
    transform: translateX(4px);
}

.faq-item__question {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-snug);
    margin-bottom: var(--space-4);
    letter-spacing: -0.01em;
}

.faq-item__answer {
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
}

/* ========================================
   Contact
   ======================================== */

.contact__description {
    text-align: center;
    font-size: var(--font-size-lg);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-16);
}

/* Googleフォーム埋め込み用 */
.contact__form-wrapper {
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
    border: 1px solid var(--color-border-secondary);
    overflow: hidden;
}

.contact__form-wrapper iframe {
    width: 100%;
    border: none;
    border-radius: var(--radius-md);
    min-height: 1400px;
}

@media (max-width: 768px) {
    .contact__form-wrapper {
        padding: var(--space-2);
    }

    .contact__form-wrapper iframe {
        min-height: 1600px;
    }
}

/* 旧フォームスタイル（削除予定） */
.contact__form {
    max-width: 640px;
    margin: 0 auto;
    background: linear-gradient(135deg, var(--color-bg-elevated) 0%, var(--color-bg-secondary) 100%);
    padding: var(--space-8);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-secondary);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
}

@media (min-width: 768px) {
    .contact__form {
        padding: clamp(var(--space-10), 4vw, var(--space-16));
    }
}

.form-group {
    margin-bottom: var(--space-6);
}

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
}

.form-required {
    color: #EF4444;
    margin-left: var(--space-1);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    background-color: var(--color-bg-secondary);
    border: 1.5px solid var(--color-border-primary);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
    font-family: inherit;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.form-input::placeholder,
.form-select::placeholder,
.form-textarea::placeholder {
    color: var(--color-text-tertiary);
}

.form-input:hover,
.form-select:hover,
.form-textarea:hover {
    border-color: var(--color-text-tertiary);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    background-color: var(--color-bg-elevated);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.04);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

.form-submit {
    text-align: center;
    margin-top: var(--space-8);
}

/* ========================================
   Footer
   ======================================== */

.footer {
    background-color: var(--color-bg-dark);
    color: var(--color-text-inverse);
    padding: var(--space-16) var(--space-8) var(--space-8);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer__content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-12);
}

.footer__brand h3 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-2);
    letter-spacing: -0.01em;
}

.footer__brand p {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    max-width: 350px;
    line-height: var(--line-height-relaxed);
}

.footer__nav ul {
    display: flex;
    gap: var(--space-6);
    flex-wrap: wrap;
}

.footer__nav a {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    transition: color var(--transition-fast);
}

.footer__nav a:hover {
    color: var(--color-text-inverse);
}

.footer__copyright {
    text-align: center;
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    padding-top: var(--space-8);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* ========================================
   レスポンシブ
   ======================================== */

@media (max-width: 768px) {
    :root {
        --space-8: 1.5rem;
        --space-12: 2rem;
        --space-16: 2.5rem;
        --space-20: 3rem;
        --space-24: 3.5rem;
        --space-32: 4rem;
    }

    .header__hamburger {
        display: flex;
    }

    .nav {
        position: fixed;
        top: 56px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 56px);
        background-color: rgba(250, 250, 249, 0.98);
        backdrop-filter: saturate(180%) blur(20px);
        -webkit-backdrop-filter: saturate(180%) blur(20px);
        transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        padding: var(--space-8);
        overflow-y: auto;
        border-right: 1px solid var(--color-border-primary);
    }

    .nav.is-active {
        left: 0;
        box-shadow: 2px 0 24px rgba(0, 0, 0, 0.1);
    }

    .nav__list {
        flex-direction: column;
        gap: var(--space-4);
        align-items: flex-start;
    }

    .nav__item a {
        display: block;
        padding: var(--space-3) 0;
        font-size: var(--font-size-base);
    }

    .hero {
        min-height: auto;
        padding: var(--space-24) var(--space-6);
    }

    .hero__actions {
        flex-direction: column;
        width: 100%;
    }

    .hero__actions .btn {
        width: 100%;
    }

    .section {
        padding: var(--space-20) 0;
    }

    .section__header {
        margin-bottom: var(--space-12);
    }

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

    .service-card {
        padding: var(--space-8);
    }

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

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

    .contact__form {
        padding: var(--space-8);
    }

    .footer__content {
        flex-direction: column;
        gap: var(--space-8);
    }

    .footer__nav ul {
        flex-direction: column;
        gap: var(--space-3);
    }
}

/* ========================================
   下層ページ専用スタイル
   ======================================== */

/* ページヒーロー */
.page-hero {
    padding: clamp(var(--space-24), 15vw, var(--space-32)) var(--space-6) clamp(var(--space-16), 10vw, var(--space-24));
    background: linear-gradient(180deg, var(--color-bg-secondary) 0%, var(--color-bg-primary) 100%);
    text-align: center;
    margin-top: 64px;
}

@media (max-width: 768px) {
    .page-hero {
        margin-top: 56px;
    }
}

.page-hero__label {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: var(--space-4);
}

.page-hero__title {
    font-size: clamp(var(--font-size-3xl), 6vw, var(--font-size-5xl));
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
    letter-spacing: -0.04em;
    color: var(--color-text-primary);
    margin-bottom: var(--space-6);
}

.page-hero__description {
    font-size: clamp(var(--font-size-base), 2vw, var(--font-size-lg));
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
    max-width: 800px;
    margin: 0 auto;
}

/* サービス詳細カード */
.service-detail__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-8);
}

@media (min-width: 768px) {
    .service-detail__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .service-detail__grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.service-detail__card {
    background: linear-gradient(135deg, var(--color-bg-elevated) 0%, var(--color-bg-secondary) 100%);
    border: 1px solid var(--color-border-secondary);
    border-radius: var(--radius-lg);
    padding: clamp(var(--space-8), 3vw, var(--space-10));
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.service-detail__card:hover {
    border-color: var(--color-border-primary);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
    transform: translateY(-4px);
}

.service-detail__card-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-snug);
    letter-spacing: -0.02em;
    margin-bottom: var(--space-6);
    color: var(--color-text-primary);
}

.service-detail__list {
    list-style: none;
    margin-bottom: var(--space-6);
}

.service-detail__list li {
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
    padding: var(--space-2) 0;
    padding-left: var(--space-5);
    position: relative;
}

.service-detail__list li::before {
    content: '·';
    position: absolute;
    left: var(--space-2);
    color: var(--color-text-tertiary);
    font-size: var(--font-size-lg);
}

.service-detail__note {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    font-style: italic;
    margin-top: var(--space-4);
}

/* エリア情報 */
.area-info {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.area-info__main {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-snug);
    letter-spacing: -0.02em;
    color: var(--color-text-primary);
    margin-bottom: var(--space-6);
}

.area-info__detail {
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
}

/* 実績セクション */
.achievements {
    max-width: 900px;
    margin: 0 auto;
}

.achievements__placeholder {
    background: linear-gradient(135deg, var(--color-bg-tertiary) 0%, var(--color-bg-secondary) 100%);
    border: 2px dashed var(--color-border-primary);
    border-radius: var(--radius-lg);
    padding: clamp(var(--space-16), 10vw, var(--space-24));
    text-align: center;
}

.achievements__placeholder-text {
    font-size: var(--font-size-lg);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-tertiary);
}

/* 活用事例 */
.use-cases {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-6);
}

@media (min-width: 768px) {
    .use-cases {
        grid-template-columns: repeat(2, 1fr);
    }
}

.use-case {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border-secondary);
    border-radius: var(--radius-lg);
    padding: clamp(var(--space-6), 3vw, var(--space-8));
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.use-case:hover {
    border-color: var(--color-border-primary);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
}

.use-case__title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-snug);
    letter-spacing: -0.01em;
    margin-bottom: var(--space-3);
    color: var(--color-text-primary);
}

.use-case__description {
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
}

/* スコープグリッド */
.scope-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-6);
}

@media (min-width: 640px) {
    .scope-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.scope-item {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border-secondary);
    border-radius: var(--radius-md);
    padding: var(--space-6);
}

.scope-item__title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-snug);
    margin-bottom: var(--space-3);
    color: var(--color-text-primary);
}

.scope-item__text {
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
}

/* AI哲学・品質情報 */
.ai-philosophy,
.quality-info,
.strength-text {
    max-width: 800px;
    margin: 0 auto;
}

.ai-philosophy__text,
.quality-info__text {
    font-size: var(--font-size-lg);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-6);
}

.ai-philosophy__highlight,
.quality-info__highlight,
.strength-highlight {
    background: linear-gradient(135deg, var(--color-bg-elevated) 0%, var(--color-bg-tertiary) 100%);
    border-left: 4px solid var(--color-accent);
    border-radius: var(--radius-md);
    padding: clamp(var(--space-6), 3vw, var(--space-8));
    margin-top: var(--space-8);
}

.ai-philosophy__highlight p,
.quality-info__highlight p,
.strength-highlight p {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-medium);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-primary);
    letter-spacing: -0.01em;
}

/* 料金情報 */
.pricing-info {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.pricing-info__text {
    font-size: var(--font-size-lg);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
}

/* CTAセクション */
.cta-section {
    background: linear-gradient(135deg, var(--color-bg-tertiary) 0%, var(--color-bg-primary) 100%);
}

.cta-box {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.cta-box__title {
    font-size: clamp(var(--font-size-2xl), 4vw, var(--font-size-4xl));
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
    letter-spacing: -0.03em;
    color: var(--color-text-primary);
    margin-bottom: var(--space-4);
}

.cta-box__description {
    font-size: var(--font-size-lg);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-10);
}

.cta-box__actions {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    flex-wrap: wrap;
}

@media (max-width: 640px) {
    .cta-box__actions {
        flex-direction: column;
    }

    .cta-box__actions .btn {
        width: 100%;
    }
}

/* フローステップ */
.flow-steps {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-6);
    max-width: 900px;
    margin: 0 auto;
}

@media (min-width: 768px) {
    .flow-steps {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .flow-steps {
        grid-template-columns: repeat(3, 1fr);
    }
}

.flow-step {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border-secondary);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    position: relative;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.flow-step:hover {
    border-color: var(--color-border-primary);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
}

.flow-step__number {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-semibold);
    color: rgba(0, 0, 0, 0.06);
    line-height: 1;
    margin-bottom: var(--space-4);
    letter-spacing: -0.03em;
    font-variant-numeric: tabular-nums;
}

.flow-step__title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-snug);
    letter-spacing: -0.01em;
    margin-bottom: var(--space-3);
    color: var(--color-text-primary);
}

.flow-step__description {
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
}

/* ========================================
   画像ギャラリー（実績用）
   ======================================== */

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

.gallery__main {
    margin-bottom: var(--space-6);
    border-radius: var(--radius-lg);
    overflow: hidden;
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border-secondary);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

.gallery__main-image {
    width: 100%;
    height: auto;
    display: block;
    transition: opacity 0.3s ease;
}

.gallery__caption {
    padding: var(--space-4) var(--space-6);
    background-color: var(--color-bg-elevated);
}

.gallery__caption p {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    text-align: center;
    margin: 0;
}

.gallery__thumbnails {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--space-4);
    margin-bottom: var(--space-8);
}

@media (min-width: 640px) {
    .gallery__thumbnails {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 768px) {
    .gallery__thumbnails {
        grid-template-columns: repeat(4, 1fr);
    }
}

.gallery__thumbnail {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: pointer;
    border: 2px solid var(--color-border-secondary);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    aspect-ratio: 4 / 3;
}

.gallery__thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.3s ease;
}

.gallery__thumbnail:hover {
    border-color: var(--color-border-primary);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transform: translateY(-2px);
}

.gallery__thumbnail:hover img {
    transform: scale(1.05);
}

.gallery__thumbnail.active {
    border-color: var(--color-accent);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
}

.gallery__thumbnail.active::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.1);
    pointer-events: none;
}

.achievements__note {
    text-align: center;
    padding: var(--space-6);
    background: linear-gradient(135deg, var(--color-bg-tertiary) 0%, var(--color-bg-secondary) 100%);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border-secondary);
}

.achievements__note p {
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
    margin: 0;
}