/* ============================================
   医療AIナビ - TOP Page Styles
   Theme: Medical × Clean (White + Blue)
   ============================================ */

:root {
    --blue-900: #0c1e3a;
    --blue-800: #0f2d5e;
    --blue-700: #14408a;
    --blue-600: #1a56b8;
    --blue-500: #2563eb;
    --blue-400: #4a83f0;
    --blue-300: #7ba4f5;
    --blue-200: #b4cdfb;
    --blue-100: #dce8fd;
    --blue-50:  #eef4fe;

    --gray-900: #111827;
    --gray-800: #1f2937;
    --gray-700: #374151;
    --gray-600: #4b5563;
    --gray-500: #6b7280;
    --gray-400: #9ca3af;
    --gray-300: #d1d5db;
    --gray-200: #e5e7eb;
    --gray-100: #f3f4f6;
    --gray-50:  #f9fafb;

    --teal-500: #0d9488;
    --teal-600: #0a7a6f;
    --green-500: #16a34a;
    --green-600: #0f8a3c;

    --font-body: 'Noto Sans JP', 'Inter', -apple-system, sans-serif;
    --font-display: 'Inter', 'Noto Sans JP', sans-serif;

    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 12px 32px rgba(0,0,0,0.10);
    --shadow-xl: 0 20px 48px rgba(0,0,0,0.12);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    color: var(--gray-800);
    background: #fff;
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; height: auto; }

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== HEADER ===== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: all 0.3s ease;
}
.site-header.scrolled {
    background: rgba(255,255,255,0.95);
    border-bottom-color: var(--gray-200);
    box-shadow: var(--shadow-sm);
}
.header-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}
.site-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.15rem;
    color: var(--blue-700);
    flex-shrink: 0;
}
.logo-img {
    width: 38px;
    height: 38px;
    object-fit: contain;
    border-radius: var(--radius-sm);
}
.logo-text {
    letter-spacing: 0.02em;
}

/* Nav */
.main-nav ul {
    display: flex;
    align-items: center;
    gap: 4px;
}
.main-nav > ul > li > a {
    display: block;
    padding: 8px 14px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--gray-600);
    border-radius: var(--radius-sm);
    transition: all 0.2s;
}
.main-nav > ul > li > a:hover,
.main-nav > ul > li > a.active {
    color: var(--blue-600);
    background: var(--blue-50);
}

/* Dropdown */
.has-dropdown { position: relative; }
.chevron { font-size: 0.7em; margin-left: 2px; transition: transform 0.2s; }
.dropdown {
    position: absolute;
    top: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    min-width: 280px;
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 8px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s;
}
.has-dropdown:hover .dropdown,
.has-dropdown.show-dropdown .dropdown {
    opacity: 1;
    visibility: visible;
}
.has-dropdown:hover .chevron { transform: rotate(180deg); }
.dropdown li a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    color: var(--gray-700);
    transition: background 0.15s;
}
.dropdown li a:hover { background: var(--gray-100); }
.dropdown-badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    white-space: nowrap;
}
.e-badge { background: var(--blue-100); color: var(--blue-700); }
.g-badge { background: #dcfce7; color: #15803d; }

/* Mobile toggle */
.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.mobile-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--gray-700);
    border-radius: 2px;
    transition: all 0.3s;
}
.mobile-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.mobile-toggle.open span:nth-child(2) { opacity: 0; }
.mobile-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

/* ===== HERO ===== */
.hero {
    position: relative;
    min-height: 520px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 24px 80px;
    overflow: hidden;
    background: linear-gradient(170deg, var(--blue-50) 0%, #fff 40%, var(--blue-50) 100%);
}
.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}
.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--blue-200) 1px, transparent 1px),
        linear-gradient(90deg, var(--blue-200) 1px, transparent 1px);
    background-size: 60px 60px;
    opacity: 0.25;
    mask-image: radial-gradient(ellipse 70% 60% at 50% 45%, black 30%, transparent 75%);
    -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 45%, black 30%, transparent 75%);
}
.hero-glow {
    position: absolute;
    top: -10%;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 400px;
    background: radial-gradient(circle, rgba(37,99,235,0.08) 0%, transparent 70%);
}
.hero-inner {
    position: relative;
    text-align: center;
    max-width: 680px;
}
.hero-label {
    display: inline-block;
    font-family: var(--font-display);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--blue-500);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: 16px;
    padding: 4px 16px;
    background: var(--blue-100);
    border-radius: 20px;
}
.hero-title {
    font-size: clamp(2.2rem, 5vw, 3.4rem);
    font-weight: 700;
    color: var(--blue-900);
    line-height: 1.2;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}
.hero-subtitle {
    font-size: 1.15rem;
    font-weight: 500;
    color: var(--blue-700);
    margin-bottom: 12px;
}
.hero-desc {
    font-size: 0.95rem;
    color: var(--gray-500);
    margin-bottom: 32px;
    line-height: 1.7;
}
.hero-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    padding: 12px 28px;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all 0.2s;
    border: 1.5px solid transparent;
}
.btn-primary {
    background: var(--blue-600);
    color: #fff;
    border-color: var(--blue-600);
}
.btn-primary:hover {
    background: var(--blue-700);
    border-color: var(--blue-700);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(37,99,235,0.25);
}
.btn-outline {
    background: #fff;
    color: var(--blue-600);
    border-color: var(--blue-300);
}
.btn-outline:hover {
    background: var(--blue-50);
    border-color: var(--blue-500);
    transform: translateY(-1px);
}

/* ===== SECTIONS ===== */
.section {
    padding: 80px 0;
}
.section-alt {
    background: var(--gray-50);
}
.section-header {
    text-align: center;
    margin-bottom: 48px;
}
.section-label {
    display: inline-block;
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--blue-500);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: 8px;
}
.section-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 8px;
}
.section-desc {
    font-size: 0.95rem;
    color: var(--gray-500);
}

/* ===== ABOUT GRID ===== */
.about-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.about-card {
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    transition: all 0.25s;
}
.about-card:hover {
    border-color: var(--blue-200);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}
.about-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--blue-50);
    border-radius: var(--radius-md);
    color: var(--blue-600);
    margin-bottom: 20px;
}
.about-icon svg { width: 22px; height: 22px; }
.about-card h3 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 10px;
}
.about-card p {
    font-size: 0.9rem;
    color: var(--gray-600);
    line-height: 1.7;
}
.coming-soon {
    display: inline-block;
    margin-left: 4px;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--blue-500);
    background: var(--blue-50);
    padding: 1px 8px;
    border-radius: 12px;
    vertical-align: middle;
}

/* ===== CERTIFICATION CARDS ===== */
.cert-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
}
.cert-card {
    display: flex;
    flex-direction: column;
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 36px 32px;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}
.cert-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
}
.cert-e::before { background: linear-gradient(90deg, var(--blue-500), var(--blue-400)); }
.cert-g::before { background: linear-gradient(90deg, var(--green-500), var(--teal-500)); }

.cert-card:hover {
    border-color: var(--blue-200);
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
}
.cert-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
}
.cert-level {
    font-size: 0.72rem;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 20px;
}
.cert-e .cert-level { background: var(--blue-100); color: var(--blue-700); }
.cert-g .cert-level { background: #dcfce7; color: #15803d; }
.cert-tag {
    font-size: 0.72rem;
    color: var(--gray-500);
    font-weight: 500;
}
.cert-name {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 4px;
}
.cert-full {
    font-family: var(--font-display);
    font-size: 0.75rem;
    color: var(--gray-400);
    margin-bottom: 16px;
    letter-spacing: 0.02em;
}
.cert-desc {
    font-size: 0.9rem;
    color: var(--gray-600);
    margin-bottom: 20px;
    line-height: 1.7;
}
.cert-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-bottom: 24px;
    flex-grow: 1;
}
.cert-features li {
    font-size: 0.82rem;
    color: var(--gray-600);
    padding-left: 18px;
    position: relative;
}
.cert-features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 7px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
}
.cert-e .cert-features li::before { background: var(--blue-300); }
.cert-g .cert-features li::before { background: #86efac; }

.cert-cta {
    font-size: 0.9rem;
    font-weight: 600;
    transition: color 0.2s;
}
.cert-e .cert-cta { color: var(--blue-600); }
.cert-g .cert-cta { color: var(--green-600); }
.cert-card:hover .cert-cta { text-decoration: underline; }

/* ===== BLOG PREVIEW (TOP page) ===== */
.blog-preview-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.blog-preview-card {
    display: flex;
    flex-direction: column;
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all 0.3s;
    text-decoration: none;
    color: inherit;
}
a.blog-preview-card:hover {
    border-color: var(--blue-200);
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
}
.blog-preview-upcoming {
    opacity: 0.65;
    cursor: default;
}
.blog-preview-thumb {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 120px;
    background: linear-gradient(135deg, var(--blue-50) 0%, var(--blue-100) 100%);
    color: var(--blue-300);
}
.blog-preview-body {
    padding: 20px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}
.blog-preview-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}
.blog-preview-cat {
    font-size: 0.7rem;
    font-weight: 600;
    padding: 2px 10px;
    border-radius: 12px;
    background: var(--blue-100);
    color: var(--blue-700);
}
.blog-preview-date {
    font-size: 0.73rem;
    color: var(--gray-400);
    font-family: var(--font-display);
}
.blog-preview-body h3 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--gray-900);
    line-height: 1.6;
    margin-bottom: 8px;
}
.blog-preview-body p {
    font-size: 0.82rem;
    color: var(--gray-500);
    line-height: 1.7;
    flex-grow: 1;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.blog-preview-more {
    display: inline-block;
    margin-top: 12px;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--blue-600);
}
a.blog-preview-card:hover .blog-preview-more { text-decoration: underline; }

/* ===== AD ===== */
.ad-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 16px 24px;
}

/* ===== FOOTER ===== */
.site-footer {
    background: var(--gray-900);
    color: var(--gray-400);
    padding: 48px 0 0;
}
.footer-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 48px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-logo {
    font-size: 1.15rem;
    font-weight: 700;
    color: #fff;
}
.footer-tagline {
    font-size: 0.8rem;
    color: var(--gray-500);
    margin-top: 4px;
}
.footer-links {
    display: flex;
    gap: 64px;
}
.footer-col h4 {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--gray-300);
    margin-bottom: 14px;
    letter-spacing: 0.05em;
}
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a {
    font-size: 0.85rem;
    color: var(--gray-400);
    transition: color 0.2s;
}
.footer-col ul li a:hover { color: #fff; }
.footer-bottom {
    max-width: 1100px;
    margin: 0 auto;
    padding: 20px 24px;
}
.footer-bottom p {
    font-size: 0.75rem;
    color: var(--gray-600);
}

/* ===== PAGE HERO (sub pages) ===== */
.page-hero {
    padding: 100px 0 40px;
    background: linear-gradient(170deg, var(--blue-50) 0%, #fff 100%);
    text-align: center;
}
.page-title {
    font-size: clamp(1.6rem, 3.5vw, 2.2rem);
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 4px;
}
.page-subtitle {
    font-family: var(--font-display);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--blue-400);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

/* ===== LEGAL PAGES (disclaimer, privacy) ===== */
.legal-content {
    max-width: 780px;
    margin: 0 auto;
    padding: 48px 0 80px;
}
.legal-section {
    margin-bottom: 36px;
}
.legal-section h2 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--gray-200);
}
.legal-section p {
    font-size: 0.9rem;
    color: var(--gray-600);
    line-height: 1.8;
    margin-bottom: 12px;
}
.legal-section a {
    color: var(--blue-600);
    text-decoration: underline;
}
.legal-list {
    list-style: none;
    padding: 0;
    margin: 12px 0;
}
.legal-list li {
    font-size: 0.9rem;
    color: var(--gray-600);
    padding: 6px 0 6px 20px;
    position: relative;
    line-height: 1.7;
}
.legal-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 14px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--blue-300);
}

/* ===== CONTACT PAGE ===== */
.contact-content {
    max-width: 640px;
    margin: 0 auto;
    padding: 48px 0 80px;
}
.contact-intro {
    font-size: 0.95rem;
    color: var(--gray-600);
    margin-bottom: 36px;
    line-height: 1.8;
}
.contact-form {
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 36px 32px;
}
.form-group {
    margin-bottom: 24px;
}
.form-label {
    display: block;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 6px;
}
.required {
    font-size: 0.7rem;
    font-weight: 600;
    color: #fff;
    background: var(--blue-500);
    padding: 1px 6px;
    border-radius: 4px;
    margin-left: 4px;
    vertical-align: middle;
}
.form-input {
    width: 100%;
    padding: 10px 14px;
    font-size: 0.9rem;
    font-family: var(--font-body);
    color: var(--gray-800);
    background: var(--gray-50);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-sm);
    transition: border-color 0.2s, box-shadow 0.2s;
    outline: none;
}
.form-input:focus {
    border-color: var(--blue-400);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
    background: #fff;
}
.form-textarea {
    resize: vertical;
    min-height: 160px;
}
.radio-group {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-top: 4px;
}
.radio-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.88rem;
    color: var(--gray-700);
    cursor: pointer;
}
.radio-label input[type="radio"] {
    accent-color: var(--blue-500);
    width: 16px;
    height: 16px;
}
.form-actions {
    display: flex;
    gap: 12px;
    margin-top: 32px;
}

/* ===== RESPONSIVE ===== */

/* タブレット横向き以下 */
@media (max-width: 960px) {
    .about-grid { grid-template-columns: 1fr 1fr; }
    .about-grid .about-card:last-child {
        grid-column: 1 / -1;
        max-width: 50%;
        margin: 0 auto;
    }
}

/* タブレット縦向き以下 */
@media (max-width: 768px) {
    .mobile-toggle { display: flex; }

    .main-nav {
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        height: calc(100vh - 64px);
        background: #fff;
        border-top: 1px solid var(--gray-200);
        box-shadow: var(--shadow-lg);
        transform: translateY(-20px);
        opacity: 0;
        pointer-events: none;
        visibility: hidden;
        transition: transform 0.3s, opacity 0.3s, visibility 0.3s;
        padding: 0;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        z-index: 999;
    }
    .main-nav.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
        visibility: visible;
    }

    /* デスクトップの display:flex を上書き */
    .main-nav ul,
    .main-nav > ul {
        display: flex;
        flex-direction: column;
        gap: 0;
        padding: 12px 24px 80px;
    }
    .main-nav > ul > li > a {
        padding: 16px 8px;
        font-size: 1rem;
        border-bottom: 1px solid var(--gray-100);
        display: block;
    }

    /* ドロップダウン（モバイル） */
    .has-dropdown .dropdown {
        position: static;
        transform: none;
        box-shadow: none;
        border: none;
        border-radius: 0;
        min-width: 0;
        width: 100%;
        padding: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease, opacity 0.3s;
        opacity: 0;
        visibility: visible;
    }
    .has-dropdown.show-dropdown .dropdown {
        max-height: 300px;
        opacity: 1;
        padding: 4px 0 8px 0;
    }
    .has-dropdown:hover .dropdown {
        /* デスクトップ用のhover表示を無効化 */
        opacity: 0;
        visibility: hidden;
        max-height: 0;
    }
    .has-dropdown.show-dropdown:hover .dropdown {
        opacity: 1;
        visibility: visible;
        max-height: 300px;
    }

    .dropdown li a {
        padding: 12px 16px;
        font-size: 0.9rem;
        display: flex;
        align-items: center;
        gap: 12px;
        white-space: nowrap;
    }

    /* ヒーロー */
    .hero {
        padding: 100px 20px 60px;
        min-height: auto;
    }
    .hero-title { font-size: 2rem; }
    .hero-subtitle { font-size: 1rem; }
    .hero-desc { font-size: 0.88rem; margin-bottom: 24px; }
    .hero-label { font-size: 0.72rem; padding: 3px 12px; }

    /* セクション */
    .section { padding: 56px 0; }
    .section-header { margin-bottom: 36px; }

    /* About */
    .about-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    .about-grid .about-card:last-child {
        max-width: 100%;
    }
    .about-card { padding: 24px 20px; }

    /* 資格カード */
    .cert-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    .cert-card { padding: 28px 24px; }
    .cert-features { grid-template-columns: 1fr 1fr; }

    /* ブログプレビュー */
    .blog-preview-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    .blog-preview-card {
        flex-direction: row;
    }
    .blog-preview-thumb {
        width: 100px;
        height: auto;
        min-height: 100px;
        flex-shrink: 0;
    }
    .blog-preview-thumb svg { width: 28px; height: 28px; }

    /* フッター */
    .footer-inner {
        flex-direction: column;
        gap: 32px;
    }
    .footer-links { gap: 40px; }

    /* サブページ */
    .page-hero { padding: 80px 0 32px; }
    .legal-content { padding: 32px 0 60px; }
    .contact-form { padding: 28px 24px; }
    .form-actions { flex-direction: column; }
    .form-actions .btn { width: 100%; justify-content: center; }
}

/* スマートフォン */
@media (max-width: 480px) {
    .header-inner { height: 56px; padding: 0 16px; }
    .main-nav { top: 56px; height: calc(100vh - 56px); }
    .main-nav ul,
    .main-nav > ul { padding: 12px 16px 80px; }
    .logo-img { width: 32px; height: 32px; }
    .logo-text { font-size: 1.05rem; }

    .hero { padding: 76px 16px 44px; }
    .hero-title { font-size: 1.7rem; }
    .hero-subtitle { font-size: 0.95rem; }
    .hero-desc { font-size: 0.85rem; }
    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }
    .btn {
        width: 100%;
        justify-content: center;
        padding: 14px 20px;
    }

    .container { padding: 0 16px; }
    .section { padding: 44px 0; }
    .section-title { font-size: 1.35rem; }
    .section-desc { font-size: 0.88rem; }

    .about-card { padding: 20px 16px; }
    .about-card h3 { font-size: 1rem; }
    .about-card p { font-size: 0.85rem; }
    .about-icon { width: 40px; height: 40px; margin-bottom: 16px; }
    .about-icon svg { width: 20px; height: 20px; }

    .cert-card { padding: 24px 20px; }
    .cert-name { font-size: 1.5rem; }
    .cert-desc { font-size: 0.85rem; }
    .cert-features {
        grid-template-columns: 1fr;
        gap: 6px;
    }
    .cert-features li { font-size: 0.8rem; }
    .cert-cta { font-size: 0.85rem; }

    .blog-preview-body { padding: 16px; }
    .blog-preview-body h3 { font-size: 0.88rem; }
    .blog-preview-thumb { width: 80px; min-height: 80px; }

    .ad-container { padding: 12px 16px; }

    .footer-inner { padding: 0 16px; gap: 28px; }
    .footer-links { flex-direction: column; gap: 24px; }
    .footer-bottom { padding: 16px; }
    .footer-bottom p { font-size: 0.7rem; }
}

/* 小型スマートフォン */
@media (max-width: 360px) {
    .logo-text { font-size: 0.95rem; }
    .hero-title { font-size: 1.5rem; }
    .hero-subtitle { font-size: 0.88rem; }
    .cert-name { font-size: 1.3rem; }
    .section-title { font-size: 1.2rem; }
}