/* ========================================
   AI Creation Co., Ltd. - Corporate Website Styles
   Design Philosophy: 静的・知的・高信頼
   ======================================== */

/* ===== Google Fonts Import ===== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Noto+Sans+JP:wght@400;500;700&display=swap');

/* ===== CSS Variables ===== */
:root {
    /* Color Palette - 新配色 */
    --deep-navy: #0B1F33;
    --frontier-teal: #1F6F78;
    --desert-gold: #C9A24D;
    --off-white: #F6F8F9;
    --text-on-navy: #EAF0F3;
    --muted-text: #A8B6C2;
    --white: #FFFFFF;
    --border-subtle: rgba(31, 111, 120, 0.15);
    
    /* Typography */
    --font-en: 'Inter', sans-serif;
    --font-ja: 'Noto Sans JP', sans-serif;
    
    /* Font Weights */
    --fw-regular: 400;
    --fw-medium: 500;
    --fw-semibold: 600;
    --fw-bold: 700;
    
    /* Letter Spacing */
    --ls-normal: 0.02em;
    --ls-wide: 0.05em;
    
    /* Container */
    --container-max: 1120px;
    
    /* Section Spacing (Mobile) */
    --section-sp-mobile: clamp(56px, 15vw, 72px);
    /* Section Spacing (Desktop) */
    --section-sp-desktop: clamp(88px, 12vw, 120px);
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    
    /* Transitions */
    --transition: 0.3s ease;
    
    /* Shadow - Minimal */
    --shadow-subtle: 0 2px 8px rgba(11, 31, 51, 0.08);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-ja), var(--font-en), sans-serif;
    font-weight: var(--fw-regular);
    color: var(--deep-navy);
    line-height: 1.75;
    letter-spacing: var(--ls-normal);
    background-color: var(--off-white);
    overflow-x: hidden;
}

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

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

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

/* ===== Container ===== */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 1.5rem;
}

@media (min-width: 768px) {
    .container {
        padding: 0 2rem;
    }
}

/* ===== Section Spacing ===== */
section {
    padding-top: var(--section-sp-mobile);
    padding-bottom: var(--section-sp-mobile);
}

@media (min-width: 768px) {
    section {
        padding-top: var(--section-sp-desktop);
        padding-bottom: var(--section-sp-desktop);
    }
}

/* ===== Header / Navigation ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--deep-navy);
    z-index: 1000;
    border-bottom: 1px solid rgba(234, 240, 243, 0.1);
}

.header__container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.header__logo-link {
    display: block;
}

.header__logo {
    height: 40px;
    width: auto;
}

/* Navigation - Desktop */
.header__nav {
    display: none;
}

@media (min-width: 768px) {
    .header__nav {
        display: flex;
        align-items: center;
        gap: 2rem;
    }
}

.header__menu {
    display: flex;
    align-items: center;
    gap: 2rem;
    list-style: none;
}

.header__link {
    color: var(--text-on-navy);
    font-size: 0.9375rem;
    font-weight: var(--fw-medium);
    letter-spacing: var(--ls-normal);
    transition: color var(--transition);
    position: relative;
}

.header__link:hover {
    color: var(--frontier-teal);
}

.header__link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--frontier-teal);
    transition: width var(--transition);
}

.header__link:hover::after,
.header__link.active::after {
    width: 100%;
}

/* Header CTA Button (Desktop) */
.header__cta {
    display: none;
}

@media (min-width: 768px) {
    .header__cta {
        display: block;
        padding: 0.625rem 1.5rem;
        background-color: var(--frontier-teal);
        color: var(--white);
        font-size: 0.9375rem;
        font-weight: var(--fw-semibold);
        border-radius: var(--radius-sm);
        transition: background-color var(--transition);
    }
    
    .header__cta:hover {
        background-color: #1A5F67;
    }
}

/* Mobile Menu Toggle */
.header__toggle {
    display: flex;
    flex-direction: column;
    gap: 5px;
    width: 28px;
    height: 28px;
    padding: 0;
}

@media (min-width: 768px) {
    .header__toggle {
        display: none;
    }
}

.header__toggle-bar {
    width: 100%;
    height: 2px;
    background-color: var(--text-on-navy);
    transition: var(--transition);
}

/* Mobile Drawer */
.mobile-drawer {
    position: fixed;
    top: 72px;
    left: 0;
    width: 100%;
    height: calc(100vh - 72px);
    background-color: var(--deep-navy);
    transform: translateX(-100%);
    transition: transform 0.4s ease;
    z-index: 999;
    overflow-y: auto;
}

.mobile-drawer.is-open {
    transform: translateX(0);
}

.mobile-drawer__menu {
    list-style: none;
    padding: 2rem 1.5rem;
}

.mobile-drawer__item {
    border-bottom: 1px solid rgba(234, 240, 243, 0.1);
}

.mobile-drawer__link {
    display: block;
    padding: 1.25rem 0;
    color: var(--text-on-navy);
    font-size: 1.125rem;
    font-weight: var(--fw-medium);
}

.mobile-drawer__cta {
    margin: 2rem 1.5rem;
    display: block;
    text-align: center;
    padding: 1rem;
    background-color: var(--frontier-teal);
    color: var(--white);
    font-weight: var(--fw-semibold);
    border-radius: var(--radius-sm);
}

/* ===== Hero Section ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background-color: var(--deep-navy);
    padding-top: 72px;
    overflow: hidden;
}

/* Hero Background Image */
.hero__bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero__bg-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.35;
}

.hero__bg-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        to bottom,
        rgba(11, 31, 51, 0.85) 0%,
        rgba(11, 31, 51, 0.75) 50%,
        rgba(11, 31, 51, 0.85) 100%
    );
}

/* Hero Content */
.hero__content {
    position: relative;
    z-index: 10;
    padding: 4rem 0;
    text-align: center;
}

@media (min-width: 768px) {
    .hero__content {
        text-align: left;
        max-width: 800px;
    }
}

.hero__tag {
    display: inline-block;
    font-family: var(--font-en);
    font-size: 0.875rem;
    font-weight: var(--fw-medium);
    letter-spacing: var(--ls-wide);
    text-transform: uppercase;
    color: var(--frontier-teal);
    margin-bottom: 1.5rem;
}

.hero__title {
    font-size: clamp(2rem, 8vw, 3.5rem);
    font-weight: var(--fw-bold);
    color: var(--white);
    line-height: 1.2;
    letter-spacing: 0.01em;
    margin-bottom: 1.5rem;
}

.hero__subtitle {
    font-size: clamp(1.125rem, 3.5vw, 1.375rem);
    font-weight: var(--fw-regular);
    color: var(--text-on-navy);
    line-height: 1.7;
    letter-spacing: var(--ls-normal);
    margin-bottom: 1rem;
}

.hero__description {
    font-size: 1rem;
    font-weight: var(--fw-regular);
    color: var(--muted-text);
    line-height: 1.75;
    margin-bottom: 2.5rem;
    max-width: 640px;
}

@media (min-width: 768px) {
    .hero__description {
        margin-bottom: 3rem;
    }
}

/* Hero Buttons */
.hero__buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
}

@media (min-width: 768px) {
    .hero__buttons {
        flex-direction: row;
        align-items: center;
        gap: 1.5rem;
    }
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: var(--fw-semibold);
    letter-spacing: var(--ls-normal);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    min-height: 44px;
    min-width: 44px;
    cursor: pointer;
}

.btn-primary {
    background-color: var(--frontier-teal);
    color: var(--white);
    border: 2px solid var(--frontier-teal);
}

.btn-primary:hover {
    background-color: #1A5F67;
    border-color: #1A5F67;
}

.btn-secondary {
    background-color: transparent;
    color: var(--frontier-teal);
    border: 2px solid var(--frontier-teal);
}

.btn-secondary:hover {
    background-color: var(--frontier-teal);
    color: var(--white);
}

/* ===== Why Frontier Section ===== */
.why-frontier {
    background-color: var(--white);
}

.section__header {
    text-align: center;
    margin-bottom: 3rem;
}

@media (min-width: 768px) {
    .section__header {
        margin-bottom: 4rem;
    }
}

.section__title {
    font-size: clamp(1.75rem, 5vw, 2.5rem);
    font-weight: var(--fw-bold);
    color: var(--deep-navy);
    line-height: 1.3;
    margin-bottom: 0.75rem;
}

.section__subtitle {
    font-size: 1.125rem;
    font-weight: var(--fw-regular);
    color: var(--muted-text);
    line-height: 1.6;
}

.why-frontier__content {
    max-width: 720px;
    margin: 0 auto;
}

.why-frontier__text {
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--deep-navy);
    margin-bottom: 1.5rem;
}

.why-frontier__list {
    list-style: none;
    margin-top: 2rem;
}

.why-frontier__item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.25rem 0;
    border-bottom: 1px solid var(--border-subtle);
}

.why-frontier__item:first-child {
    border-top: 1px solid var(--border-subtle);
}

.why-frontier__icon {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    color: var(--frontier-teal);
}

.why-frontier__item-content {
    flex: 1;
}

.why-frontier__item-title {
    font-size: 1.125rem;
    font-weight: var(--fw-semibold);
    color: var(--deep-navy);
    margin-bottom: 0.375rem;
}

.why-frontier__item-text {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--muted-text);
}

/* ===== Philosophy / First Penguin Section ===== */
.philosophy {
    background-color: var(--off-white);
}

.philosophy__content {
    max-width: 720px;
    margin: 0 auto;
    text-align: center;
}

.philosophy__label {
    display: inline-block;
    font-family: var(--font-en);
    font-size: 0.875rem;
    font-weight: var(--fw-semibold);
    letter-spacing: var(--ls-wide);
    text-transform: uppercase;
    color: var(--desert-gold);
    margin-bottom: 1rem;
}

.philosophy__title {
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: var(--fw-bold);
    color: var(--deep-navy);
    line-height: 1.3;
    margin-bottom: 1.5rem;
}

.philosophy__text {
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--deep-navy);
}

/* ===== Proof / Stats Section ===== */
.proof {
    background-color: var(--white);
}

.proof__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    max-width: 860px;
    margin: 0 auto;
}

@media (min-width: 768px) {
    .proof__grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 3rem;
    }
}

.proof__item {
    text-align: center;
    padding: 1.5rem 0;
}

.proof__number {
    font-family: var(--font-en);
    font-size: clamp(2.5rem, 8vw, 3.5rem);
    font-weight: var(--fw-bold);
    color: var(--frontier-teal);
    line-height: 1;
    margin-bottom: 0.75rem;
}

.proof__label {
    font-size: 1rem;
    font-weight: var(--fw-medium);
    color: var(--deep-navy);
    margin-bottom: 0.5rem;
}

.proof__description {
    font-size: 0.9375rem;
    color: var(--muted-text);
    line-height: 1.6;
}

/* ===== Services Section ===== */
.services {
    background-color: var(--off-white);
}

.services__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    margin-top: 3rem;
}

@media (min-width: 768px) {
    .services__grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 2.5rem;
    }
}

.service-card {
    background-color: var(--white);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 2rem;
    transition: var(--transition);
}

.service-card:hover {
    box-shadow: var(--shadow-subtle);
}

.service-card__number {
    font-family: var(--font-en);
    font-size: 0.875rem;
    font-weight: var(--fw-semibold);
    letter-spacing: var(--ls-wide);
    color: var(--desert-gold);
    margin-bottom: 1rem;
}

.service-card__title {
    font-size: 1.375rem;
    font-weight: var(--fw-bold);
    color: var(--deep-navy);
    line-height: 1.3;
    margin-bottom: 1rem;
}

.service-card__description {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--muted-text);
}

/* ===== CTA Section ===== */
.cta {
    background-color: var(--deep-navy);
    text-align: center;
}

.cta__title {
    font-size: clamp(1.5rem, 5vw, 2.25rem);
    font-weight: var(--fw-bold);
    color: var(--white);
    line-height: 1.3;
    margin-bottom: 1.5rem;
}

.cta__description {
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--text-on-navy);
    margin-bottom: 2.5rem;
    max-width: 640px;
    margin-left: auto;
    margin-right: auto;
}

.cta__buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
    justify-content: center;
}

@media (min-width: 768px) {
    .cta__buttons {
        flex-direction: row;
        gap: 1.5rem;
    }
}

/* ===== Footer ===== */
.footer {
    background-color: var(--deep-navy);
    color: var(--text-on-navy);
    padding-top: 4rem;
    padding-bottom: 2rem;
}

.footer__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

@media (min-width: 768px) {
    .footer__grid {
        grid-template-columns: 2fr 1fr 1fr;
        gap: 4rem;
    }
}

.footer__brand-name {
    font-size: 1.125rem;
    font-weight: var(--fw-bold);
    color: var(--white);
    margin-bottom: 0.5rem;
}

.footer__brand-name-jp {
    font-size: 0.9375rem;
    color: var(--muted-text);
    margin-bottom: 1rem;
}

.footer__tagline {
    font-size: 0.9375rem;
    font-style: italic;
    color: var(--muted-text);
}

.footer__section-title {
    font-size: 1rem;
    font-weight: var(--fw-semibold);
    color: var(--white);
    margin-bottom: 1rem;
}

.footer__links {
    list-style: none;
}

.footer__link-item {
    margin-bottom: 0.75rem;
}

.footer__link {
    color: var(--muted-text);
    font-size: 0.9375rem;
    transition: color var(--transition);
}

.footer__link:hover {
    color: var(--frontier-teal);
}

.footer__contact-item {
    margin-bottom: 0.75rem;
    font-size: 0.9375rem;
    color: var(--muted-text);
}

.footer__contact-link {
    color: var(--frontier-teal);
    transition: color var(--transition);
}

.footer__contact-link:hover {
    color: #2A8F99;
}

.footer__bottom {
    padding-top: 2rem;
    border-top: 1px solid rgba(234, 240, 243, 0.1);
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
    text-align: center;
}

@media (min-width: 768px) {
    .footer__bottom {
        flex-direction: row;
        justify-content: space-between;
    }
}

.footer__copyright {
    font-size: 0.875rem;
    color: var(--muted-text);
}

.footer__privacy-link {
    font-size: 0.875rem;
    color: var(--muted-text);
    transition: color var(--transition);
}

.footer__privacy-link:hover {
    color: var(--frontier-teal);
}

/* ===== Utility Classes ===== */
.text-center {
    text-align: center;
}

.hidden {
    display: none !important;
}

/* ===== Responsive Breakpoints ===== */
/* Mobile: < 768px */
/* Tablet & Desktop: >= 768px */

/* ===== Page Hero (for internal pages) ===== */
.page-hero {
    padding-top: 120px;
    padding-bottom: 4rem;
    background-color: var(--off-white);
    text-align: center;
}

@media (min-width: 768px) {
    .page-hero {
        padding-top: 140px;
        padding-bottom: 5rem;
    }
}

.page-hero__title {
    font-size: clamp(2rem, 6vw, 3rem);
    font-weight: var(--fw-bold);
    color: var(--deep-navy);
    line-height: 1.2;
    margin-bottom: 1rem;
}

.page-hero__description {
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--muted-text);
    max-width: 720px;
    margin: 0 auto;
}

/* ===== Service Detail Sections ===== */
.service-detail {
    padding-top: var(--section-sp-mobile);
    padding-bottom: var(--section-sp-mobile);
    background-color: var(--white);
}

@media (min-width: 768px) {
    .service-detail {
        padding-top: var(--section-sp-desktop);
        padding-bottom: var(--section-sp-desktop);
    }
}

.service-detail--alt {
    background-color: var(--off-white);
}

.service-detail__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    align-items: center;
}

@media (min-width: 768px) {
    .service-detail__grid {
        grid-template-columns: 1fr 1fr;
        gap: 4rem;
    }
    
    .service-detail__grid--reverse {
        direction: rtl;
    }
    
    .service-detail__grid--reverse > * {
        direction: ltr;
    }
}

.service-detail__number {
    font-family: var(--font-en);
    font-size: 0.875rem;
    font-weight: var(--fw-semibold);
    letter-spacing: var(--ls-wide);
    color: var(--desert-gold);
    margin-bottom: 1rem;
}

.service-detail__title {
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: var(--fw-bold);
    color: var(--deep-navy);
    line-height: 1.3;
    margin-bottom: 1rem;
}

.service-detail__lead {
    font-size: 1.125rem;
    font-weight: var(--fw-medium);
    color: var(--deep-navy);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.service-detail__text {
    font-size: 1rem;
    line-height: 1.75;
    color: var(--deep-navy);
}

.service-detail__text p {
    margin-bottom: 1.25rem;
}

.service-detail__text ul {
    list-style: none;
    margin: 1.5rem 0;
}

.service-detail__text li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 1rem;
}

.service-detail__text li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--frontier-teal);
    font-weight: var(--fw-bold);
}

.service-detail__text strong {
    font-weight: var(--fw-semibold);
    color: var(--deep-navy);
}

.service-detail__image {
    border-radius: var(--radius-md);
    overflow: hidden;
}

.service-detail__image img {
    width: 100%;
    height: auto;
    display: block;
}

/* ===== Company Page Styles ===== */
.company-intro {
    background-color: var(--white);
}

.company-intro__text {
    max-width: 800px;
    margin: 0 auto;
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--deep-navy);
}

.company-intro__text p {
    margin-bottom: 1.5rem;
}

.company-info {
    background-color: var(--off-white);
}

.company-info__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 768px) {
    .company-info__grid {
        grid-template-columns: 1fr 1fr;
        gap: 3rem;
    }
}

.company-info__item {
    display: flex;
    gap: 1rem;
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--border-subtle);
}

.company-info__label {
    flex-shrink: 0;
    width: 140px;
    font-weight: var(--fw-semibold);
    color: var(--deep-navy);
}

.company-info__value {
    flex: 1;
    color: var(--deep-navy);
    line-height: 1.7;
}

/* ===== Contact Form Styles ===== */
.contact-form-section {
    background-color: var(--white);
}

.contact-form {
    max-width: 720px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    font-size: 1rem;
    font-weight: var(--fw-medium);
    color: var(--deep-navy);
    margin-bottom: 0.5rem;
}

.form-label-required::after {
    content: '*';
    color: #E53E3E;
    margin-left: 0.25rem;
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 0.875rem 1rem;
    font-family: inherit;
    font-size: 1rem;
    color: var(--deep-navy);
    background-color: var(--white);
    border: 2px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    transition: border-color var(--transition);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--frontier-teal);
}

.form-textarea {
    min-height: 160px;
    resize: vertical;
}

.form-message {
    padding: 1rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1.5rem;
    font-size: 0.9375rem;
}

.form-message.success {
    background-color: #C6F6D5;
    color: #22543D;
    border: 1px solid #9AE6B4;
}

.form-message.error {
    background-color: #FED7D7;
    color: #742A2A;
    border: 1px solid #FC8181;
}

.form-message.info {
    background-color: #BEE3F8;
    color: #2C5282;
    border: 1px solid: #90CDF4;
}

/* ===== News Page Styles ===== */
.news-list {
    background-color: var(--white);
}

.news-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 768px) {
    .news-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 2.5rem;
    }
}

.news-card {
    background-color: var(--white);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
}

.news-card:hover {
    box-shadow: var(--shadow-subtle);
}

.news-card__image {
    width: 100%;
    height: 220px;
    overflow: hidden;
    background-color: var(--off-white);
}

.news-card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.news-card__content {
    padding: 1.5rem;
}

.news-card__date {
    font-size: 0.875rem;
    color: var(--muted-text);
    margin-bottom: 0.75rem;
}

.news-card__title {
    font-size: 1.25rem;
    font-weight: var(--fw-semibold);
    color: var(--deep-navy);
    line-height: 1.4;
    margin-bottom: 0.75rem;
}

.news-card__excerpt {
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--muted-text);
    margin-bottom: 1rem;
}

.news-card__link {
    color: var(--frontier-teal);
    font-weight: var(--fw-medium);
    font-size: 0.9375rem;
    transition: color var(--transition);
}

.news-card__link:hover {
    color: #1A5F67;
}

/* ===== News Article Page ===== */
.article-header {
    padding-top: 120px;
    padding-bottom: 3rem;
    background-color: var(--off-white);
}

@media (min-width: 768px) {
    .article-header {
        padding-top: 140px;
        padding-bottom: 4rem;
    }
}

.article-header__date {
    font-size: 0.9375rem;
    color: var(--muted-text);
    margin-bottom: 1rem;
}

.article-header__title {
    font-size: clamp(1.75rem, 5vw, 2.5rem);
    font-weight: var(--fw-bold);
    color: var(--deep-navy);
    line-height: 1.3;
}

.article-content {
    background-color: var(--white);
    padding-top: 3rem;
    padding-bottom: 3rem;
}

@media (min-width: 768px) {
    .article-content {
        padding-top: 4rem;
        padding-bottom: 4rem;
    }
}

.article-body {
    max-width: 800px;
    margin: 0 auto;
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--deep-navy);
}

.article-body p {
    margin-bottom: 1.5rem;
}

.article-body h2 {
    font-size: 1.75rem;
    font-weight: var(--fw-bold);
    color: var(--deep-navy);
    margin-top: 2.5rem;
    margin-bottom: 1rem;
}

.article-body h3 {
    font-size: 1.375rem;
    font-weight: var(--fw-semibold);
    color: var(--deep-navy);
    margin-top: 2rem;
    margin-bottom: 0.75rem;
}

.article-body ul,
.article-body ol {
    list-style-position: outside;
    padding-left: 1.5rem;
    margin-bottom: 1.5rem;
}

.article-body ul {
    list-style-type: disc;
}

.article-body ol {
    list-style-type: decimal;
}

.article-body li {
    margin-bottom: 0.5rem;
}

/* ===== Privacy Page ===== */
.privacy-content {
    background-color: var(--white);
    padding-top: 3rem;
    padding-bottom: 3rem;
}

@media (min-width: 768px) {
    .privacy-content {
        padding-top: 4rem;
        padding-bottom: 4rem;
    }
}

.privacy-body {
    max-width: 800px;
    margin: 0 auto;
    font-size: 0.9375rem;
    line-height: 1.75;
    color: var(--deep-navy);
}

.privacy-body h2 {
    font-size: 1.5rem;
    font-weight: var(--fw-bold);
    color: var(--deep-navy);
    margin-top: 2.5rem;
    margin-bottom: 1rem;
}

.privacy-body h3 {
    font-size: 1.125rem;
    font-weight: var(--fw-semibold);
    color: var(--deep-navy);
    margin-top: 2rem;
    margin-bottom: 0.75rem;
}

.privacy-body p {
    margin-bottom: 1rem;
}

.privacy-body ul {
    list-style-position: outside;
    list-style-type: disc;
    padding-left: 1.5rem;
    margin-bottom: 1rem;
}

.privacy-body li {
    margin-bottom: 0.5rem;
}

/* ===== Partners Section ===== */
.partners {
    background-color: var(--off-white);
}

.partners__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    margin-top: 3rem;
}

@media (min-width: 768px) {
    .partners__grid {
        grid-template-columns: repeat(5, 1fr);
        gap: 2.5rem;
    }
}

.partner-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.partner-logo {
    width: 100%;
    max-width: 180px;
    height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--white);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    padding: 1rem;
    margin-bottom: 1rem;
    transition: var(--transition);
}

.partner-logo:hover {
    box-shadow: var(--shadow-subtle);
}

.partner-logo img {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
}

.partner-name {
    font-size: 0.875rem;
    font-weight: var(--fw-medium);
    color: var(--deep-navy);
    line-height: 1.4;
}

/* Privacy checkbox styles */
.form-checkbox-group {
    margin-top: 2rem;
    padding: 1rem;
    background-color: #F6F8F9;
    border-radius: 8px;
}

.form-checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    cursor: pointer;
    user-select: none;
}

.form-checkbox {
    width: 20px;
    height: 20px;
    min-width: 20px;
    margin-top: 0.125rem;
    cursor: pointer;
    accent-color: var(--frontier-teal);
}

.form-checkbox-text {
    font-size: 0.95rem;
    line-height: 1.5;
    color: var(--deep-navy);
}

.privacy-link {
    color: var(--frontier-teal);
    text-decoration: underline;
    font-weight: 500;
    transition: color 0.2s ease;
}

.privacy-link:hover {
    color: var(--desert-gold);
}

/* Privacy policy page styles */
.privacy-policy {
    padding: 4rem 0 6rem;
    background-color: white;
}

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

.privacy-policy__intro {
    margin-bottom: 3rem;
    padding: 1.5rem;
    background-color: #F6F8F9;
    border-left: 4px solid var(--frontier-teal);
    border-radius: 4px;
}

.privacy-policy__intro p {
    margin: 0;
    line-height: 1.75;
    color: var(--deep-navy);
}

.privacy-policy__section {
    margin-bottom: 3rem;
}

.privacy-policy__section-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--deep-navy);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--frontier-teal);
}

.privacy-policy__section p {
    margin-bottom: 1rem;
    line-height: 1.75;
    color: var(--deep-navy);
}

.privacy-policy__list {
    list-style: none;
    padding-left: 0;
    margin: 1.5rem 0;
}

.privacy-policy__list li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.75rem;
    line-height: 1.75;
    color: var(--deep-navy);
}

.privacy-policy__list li:before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--frontier-teal);
    font-weight: bold;
    font-size: 1.25rem;
}

.privacy-policy__contact {
    margin-top: 1.5rem;
    padding: 1.5rem;
    background-color: #F6F8F9;
    border-radius: 8px;
}

.privacy-policy__contact p {
    margin: 0.5rem 0;
}

.privacy-policy__contact a {
    color: var(--frontier-teal);
    text-decoration: none;
    font-weight: 500;
}

.privacy-policy__contact a:hover {
    text-decoration: underline;
}

.privacy-policy__updated {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid #E0E0E0;
    text-align: right;
}

.privacy-policy__updated p {
    margin: 0.25rem 0;
    font-size: 0.9rem;
    color: var(--muted-text);
}

/* ===== Hero Mobile Optimization ===== */

/* モバイル: Heroセクションをシンプルに、余白を広く */
@media (max-width: 767px) {
    .hero {
        min-height: 100vh;
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 0 1.5rem;
    }
    
    .hero__content {
        padding: 4rem 0;
        width: 100%;
    }
    
    /* モバイルではsubtitleとdescriptionを非表示 */
    .hero__subtitle--desktop,
    .hero__description--desktop {
        display: none;
    }
    
    /* デスクトップの改行を非表示 */
    .hero__title-br-desktop {
        display: none;
    }
    
    /* モバイルの改行を表示 */
    .hero__title-br-mobile {
        display: block;
    }
    
    .hero__title {
        font-size: 1.75rem;
        margin-bottom: 3rem;
        line-height: 1.5;
        padding: 0;
    }
    
    .hero__tag {
        margin-bottom: 2rem;
        font-size: 0.7rem;
        padding: 0;
    }
    
    .hero__buttons {
        gap: 1.25rem;
        margin-top: 3rem;
    }
    
    .btn {
        width: 100%;
        max-width: 100%;
        padding: 1.125rem 1.5rem;
        font-size: 1rem;
    }
}

/* デスクトップ: 詳細テキストをHero内に表示 */
@media (min-width: 768px) {
    .hero__subtitle--desktop,
    .hero__description--desktop {
        display: block;
    }
    
    /* デスクトップの改行を表示 */
    .hero__title-br-desktop {
        display: inline;
    }
    
    /* モバイルの改行を非表示 */
    .hero__title-br-mobile {
        display: none;
    }
}

/* Hero Details Section (スマホのみ表示) - 目立つデザイン */
.hero-details {
    display: block;
    background: linear-gradient(135deg, var(--deep-navy) 0%, #0F2A42 100%);
    padding: 4rem 2rem;
    position: relative;
    overflow: hidden;
}

/* 装飾的な背景要素 */
.hero-details::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--frontier-teal) 0%, var(--desert-gold) 100%);
}

.hero-details::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(31, 111, 120, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

@media (min-width: 768px) {
    .hero-details {
        display: none;
    }
}

.hero-details__subtitle {
    font-size: 1.25rem;
    font-weight: var(--fw-bold);
    color: var(--white);
    line-height: 2;
    letter-spacing: var(--ls-normal);
    margin-bottom: 2rem;
    padding: 0;
    position: relative;
    z-index: 1;
}

.hero-details__description {
    font-size: 1rem;
    font-weight: var(--fw-regular);
    color: var(--text-on-navy);
    line-height: 2;
    padding: 0;
    position: relative;
    z-index: 1;
    opacity: 0.95;
}

/* モバイルで余白をより広く */
@media (max-width: 767px) {
    .hero-details {
        padding: 4.5rem 2rem;
    }
    
    .hero-details__subtitle {
        font-size: 1.1875rem;
        margin-bottom: 2rem;
        line-height: 2;
    }
    
    .hero-details__description {
        font-size: 0.9375rem;
        line-height: 2.1;
    }
}

/* ===== Article Thumbnail Section ===== */
.article-thumbnail {
    padding: 0;
    background-color: var(--white);
}

.article-thumbnail .container {
    max-width: 900px;
    padding: 0;
}

.article-thumbnail__image {
    width: 100%;
    height: auto;
    max-height: 500px;
    object-fit: cover;
    display: block;
    border-radius: 0;
}

@media (min-width: 768px) {
    .article-thumbnail {
        padding: 2rem 0;
    }
    
    .article-thumbnail .container {
        padding: 0 1.5rem;
    }
    
    .article-thumbnail__image {
        border-radius: var(--radius-md);
        box-shadow: var(--shadow-subtle);
    }
}