/* ==========================================================================
   CSS Design System: GAFA-Style Dark & Neon Theme
   ========================================================================== */

/* 変数定義（デザインシステム） */
:root {
    --bg-dark: #07080d;
    --bg-card: rgba(255, 255, 255, 0.03);
    --bg-card-hover: rgba(255, 255, 255, 0.06);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-color-active: rgba(255, 255, 255, 0.2);
    
    --text-primary: #f8f9fa;
    --text-secondary: #a0aec0;
    --text-muted: #718096;

    /* ネオンアクセントカラー */
    --color-cyan: #00f2fe;
    --color-magenta: #f35588;
    --color-purple: #7928ca;
    
    --gradient-primary: linear-gradient(135deg, var(--color-cyan) 0%, var(--color-purple) 100%);
    --gradient-hover: linear-gradient(135deg, var(--color-cyan) 20%, var(--color-magenta) 100%);
    --gradient-text: linear-gradient(90deg, var(--color-cyan) 0%, var(--color-magenta) 100%);

    --font-sans: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    
    --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    --blur-strength: 16px;
}

/* 基本スタイル */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: var(--font-sans);
    overflow-x: hidden;
}

body {
    min-height: 100vh;
    line-height: 1.6;
    letter-spacing: 0.03em;
    position: relative;
}

/* 背景グラデーションオーブ（アニメーションする光の玉） */
.bg-glow {
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    filter: blur(140px);
    opacity: 0.15;
    z-index: -1;
    pointer-events: none;
    animation: pulse 12s infinite alternate ease-in-out;
}

.bg-glow-1 {
    top: -10%;
    left: -10%;
    background: var(--color-cyan);
}

.bg-glow-2 {
    top: 40%;
    right: -10%;
    background: var(--color-magenta);
    animation-delay: -6s;
}

@keyframes pulse {
    0% {
        transform: translate(0, 0) scale(1);
    }
    100% {
        transform: translate(80px, 50px) scale(1.2);
    }
}

/* タイポグラフィと共通パーツ */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.3;
    color: var(--text-primary);
}

p {
    color: var(--text-secondary);
}

.text-center { text-align: center; }

.text-gradient {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.badge {
    display: inline-block;
    padding: 0.5rem 1.2rem;
    border-radius: 9999px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-cyan);
    margin-bottom: 1.5rem;
    letter-spacing: 0.1em;
}

/* ボタン */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.9rem 2rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-smooth);
    border: none;
}

.btn-sm {
    padding: 0.5rem 1.2rem;
    font-size: 0.85rem;
}

.btn-lg {
    padding: 1.2rem 3rem;
    font-size: 1.1rem;
}

.btn-block {
    display: flex;
    width: 100%;
}

.btn-primary {
    background: var(--text-primary);
    color: var(--bg-dark);
}

.btn-primary:hover {
    background: #ffffff;
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.4);
    transform: translateY(-2px);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(var(--blur-strength));
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--border-color-active);
    transform: translateY(-2px);
}

.btn-gradient {
    background: var(--gradient-primary);
    color: var(--text-primary);
    box-shadow: 0 4px 20px rgba(121, 40, 202, 0.3);
}

.btn-gradient:hover {
    background: var(--gradient-hover);
    box-shadow: 0 0 25px rgba(0, 242, 254, 0.5);
    transform: translateY(-2px);
}

/* ヘッダー */
#site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(7, 8, 13, 0.7);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition-smooth);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.2rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-img {
    height: 48px;
    width: auto;
    object-fit: contain;
}

.logo-accent {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition-smooth);
}

.nav-links a:not(.btn):hover {
    color: var(--text-primary);
}

/* ヒーローセクション */
#hero {
    padding: 10rem 2rem 4rem 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-content {
    max-width: 800px;
}

.hero-title {
    font-size: 4rem;
    letter-spacing: -0.02em;
    margin-bottom: 1.5rem;
}

.hero-lead {
    font-size: 1.25rem;
    color: var(--text-secondary);
    font-weight: 300;
}

/* 分岐セクション（エントランス） */
#entrance {
    padding: 2rem 2rem 6rem 2rem;
}

.entrance-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
}

.entrance-card {
    position: relative;
    border-radius: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(var(--blur-strength));
    overflow: hidden;
    transition: var(--transition-smooth);
    padding: 3rem;
    display: flex;
    flex-direction: column;
}

.card-glow {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 50% -20%, rgba(255, 255, 255, 0.08), transparent 60%);
    transition: var(--transition-smooth);
    pointer-events: none;
}

.entrance-card:hover {
    transform: translateY(-8px);
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
}

/* カードごとのホバー時発光グラデーション */
.card-univ:hover .card-glow {
    background: radial-gradient(circle at 50% -20%, rgba(0, 242, 254, 0.15), transparent 70%);
}

.card-biz:hover .card-glow {
    background: radial-gradient(circle at 50% -20%, rgba(243, 85, 136, 0.15), transparent 70%);
}

.card-content {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: var(--color-cyan);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
}

.card-biz .card-icon {
    color: var(--color-magenta);
}

.entrance-card h2 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    letter-spacing: -0.01em;
}

.card-desc {
    font-size: 1rem;
    line-height: 1.7;
    margin-bottom: 2rem;
}

.card-features {
    list-style: none;
    margin-bottom: 3rem;
    flex-grow: 1;
}

.card-features li {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 0.8rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.card-features li i {
    color: var(--color-cyan);
    font-size: 0.85rem;
}

.card-biz .card-features li i {
    color: var(--color-magenta);
}

/* 代表紹介セクション */
#about {
    padding: 6rem 2rem;
    background: rgba(255, 255, 255, 0.01);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.about-container {
    max-width: 1200px;
    margin: 0 auto;
}

.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 4rem;
    align-items: center;
}

.section-badge {
    font-size: 0.8rem;
    color: var(--color-cyan);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: 1rem;
    display: block;
}

.about-text h2 {
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
}

.about-desc {
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
    line-height: 1.8;
}

.stat-group {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 3rem;
}

.stat-item {
    border-left: 2px solid var(--color-cyan);
    padding-left: 1rem;
}

.about-text .stat-item:nth-child(3) {
    border-left-color: var(--color-magenta);
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* 動画プレースホルダー */
.about-image-card {
    position: relative;
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    aspect-ratio: 9 / 16; /* 縦動画の縦横比 */
    max-height: 500px;
    margin: 0 auto;
    background: linear-gradient(135deg, rgba(0, 242, 254, 0.1), rgba(243, 85, 136, 0.1));
}

.about-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.about-image-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.about-image-placeholder:hover {
    background: linear-gradient(135deg, rgba(0, 242, 254, 0.2), rgba(243, 85, 136, 0.2));
}

.video-play-icon {
    font-size: 4rem;
    color: #ffffff;
    opacity: 0.8;
    margin-bottom: 1rem;
    transition: var(--transition-smooth);
}

.about-image-placeholder:hover .video-play-icon {
    transform: scale(1.1);
    opacity: 1;
    color: var(--color-cyan);
}

.video-overlay-text {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* 実績ティザー（非公開誘導） */
#works-teaser {
    padding: 6rem 2rem;
}

.teaser-container {
    max-width: 900px;
    margin: 0 auto;
}

.teaser-glass-box {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 4rem 3rem;
    border-radius: 24px;
    backdrop-filter: blur(var(--blur-strength));
    position: relative;
}

.teaser-alert-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 1rem;
    background: rgba(243, 85, 136, 0.1);
    border: 1px solid rgba(243, 85, 136, 0.2);
    border-radius: 9999px;
    font-size: 0.85rem;
    color: var(--color-magenta);
    margin-bottom: 1.5rem;
}

.teaser-glass-box h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

.teaser-text {
    font-size: 1rem;
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.teaser-highlight {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2rem;
}

.teaser-btn {
    border-color: rgba(243, 85, 136, 0.4);
}

.teaser-btn:hover {
    border-color: var(--color-magenta);
    box-shadow: 0 0 15px rgba(243, 85, 136, 0.2);
}

/* お問い合わせフォーム */
#contact {
    padding: 6rem 2rem;
    background: linear-gradient(180deg, var(--bg-dark) 0%, #0d0f17 100%);
    border-top: 1px solid var(--border-color);
}

.contact-container {
    max-width: 750px;
    margin: 0 auto;
}

.contact-header h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.contact-lead {
    font-size: 1.1rem;
    margin-bottom: 3.5rem;
}

.contact-card-form {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 3.5rem;
    border-radius: 24px;
    backdrop-filter: blur(var(--blur-strength));
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.form-group {
    margin-bottom: 2rem;
}

.form-label {
    display: block;
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 0.8rem;
    color: var(--text-primary);
}

.badge-required {
    background: rgba(243, 85, 136, 0.15);
    color: var(--color-magenta);
    font-size: 0.75rem;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    margin-left: 0.5rem;
}

.badge-optional {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-secondary);
    font-size: 0.75rem;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    margin-left: 0.5rem;
}

/* ラジオボタンのスマートなデザイン */
.form-radio-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: rgba(255, 255, 255, 0.01);
    border: 1px solid var(--border-color);
    padding: 1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.radio-label:hover {
    background: rgba(255, 255, 255, 0.03);
    border-color: var(--border-color-active);
}

.radio-label input[type="radio"] {
    display: none;
}

.radio-custom {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    position: relative;
    transition: var(--transition-smooth);
}

.radio-label input[type="radio"]:checked + .radio-custom {
    border-color: var(--color-cyan);
    background: rgba(0, 242, 254, 0.1);
}

.radio-label input[type="radio"]:checked + .radio-custom::after {
    content: '';
    position: absolute;
    width: 10px;
    height: 10px;
    background: var(--color-cyan);
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

/* 一般企業用を選択した際のアクティブ表示切替（JSと連携） */
.radio-label.active-biz input[type="radio"]:checked + .radio-custom {
    border-color: var(--color-magenta);
    background: rgba(243, 85, 136, 0.1);
}

.radio-label.active-biz input[type="radio"]:checked + .radio-custom::after {
    background: var(--color-magenta);
}

/* テキストインプット */
.form-input {
    width: 100%;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    padding: 1rem;
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: var(--font-sans);
    transition: var(--transition-smooth);
}

.form-input:focus {
    outline: none;
    background: rgba(255, 255, 255, 0.04);
    border-color: var(--color-cyan);
    box-shadow: 0 0 10px rgba(0, 242, 254, 0.2);
}

.form-submit {
    margin-top: 3rem;
}

.btn-submit {
    width: 100%;
}

/* 送信完了表示 */
.success-message {
    padding: 2rem 0;
}

.success-icon {
    font-size: 4rem;
    color: var(--color-cyan);
    margin-bottom: 1.5rem;
}

.success-message h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

/* フッター */
#site-footer {
    padding: 3rem 2rem;
    border-top: 1px solid var(--border-color);
    background: var(--bg-dark);
}

#site-footer p {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* ==========================================================================
   アニメーション用ユーティリティ
   ========================================================================== */
.fade-in {
    opacity: 0;
    animation: fadeIn 1s forwards ease-out;
}

.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

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

.fade-in-left {
    opacity: 0;
    transform: translateX(-40px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.fade-in-left.appear {
    opacity: 1;
    transform: translateX(0);
}

.fade-in-right {
    opacity: 0;
    transform: translateX(40px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.fade-in-right.appear {
    opacity: 1;
    transform: translateX(0);
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

/* ==========================================================================
   会社概要 ＆ 強みセクション
   ========================================================================== */
#company-profile {
    padding: 6rem 2rem;
    background: rgba(255, 255, 255, 0.01);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.profile-container {
    max-width: 1200px;
    margin: 0 auto;
}

.profile-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 4rem;
    align-items: flex-start;
}

.profile-strengths h2 {
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
}

.strength-desc {
    font-size: 1.05rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
}

.company-card-table {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 2.5rem;
    backdrop-filter: blur(var(--blur-strength));
}

.company-card-table h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.profile-table {
    width: 100%;
    border-collapse: collapse;
}

.profile-table tr {
    border-bottom: 1px solid var(--border-color);
}

.profile-table tr:last-child {
    border-bottom: none;
}

.profile-table th, .profile-table td {
    padding: 1.2rem 0;
    font-size: 0.95rem;
    vertical-align: top;
}

.profile-table th {
    width: 30%;
    color: var(--text-primary);
    font-weight: 600;
    text-align: left;
}

.profile-table td {
    color: var(--text-secondary);
}

.profile-business-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.profile-business-list li {
    margin-bottom: 0.5rem;
    position: relative;
    padding-left: 1rem;
}

.profile-business-list li::before {
    content: "•";
    color: var(--color-cyan);
    position: absolute;
    left: 0;
    font-weight: bold;
}

/* ==========================================================================
   レスポンシブデザイン（モバイル対応）
   ========================================================================== */
@media (max-width: 992px) {
    .profile-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    .entrance-container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .about-image-card {
        max-width: 320px;
    }

    .hero-title {
        font-size: 2.8rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none; /* 簡単なハンバーガーは今回省略し、スマホはロゴのみ、または簡易遷移 */
    }

    .hero-title {
        font-size: 2.2rem;
    }

    .entrance-card {
        padding: 2rem;
    }

    .contact-card-form {
        padding: 2rem 1.5rem;
    }

    .stat-group {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}