/* ==========================================================================
   株式会社Droplet コーポレートサイト カスタムスタイル
   Tailwind CSS (CDN) のユーティリティで表現しきれない部分を補完する
   ========================================================================== */

:root {
    --droplet-blue: #00d1e8;
    --droplet-navy: #0b1e33;
    --droplet-navy-light: #12293f;
    --droplet-pink: #f5b8c4;
    --droplet-yellow: #ffd93d;
    --droplet-orange: #ff9f43;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
    -webkit-font-smoothing: antialiased;
}

/* ヘッダー直下に隠れないよう、各セクションにスクロール時の余白を確保 */
section[id] {
    scroll-margin-top: 4.5rem;
}

/* ブランドカラー系ユーティリティ */
.bg-droplet { background-color: var(--droplet-blue); }
.text-droplet { color: var(--droplet-blue); }
.border-droplet { border-color: var(--droplet-blue); }
.bg-droplet-navy { background-color: var(--droplet-navy); }

/* ヘッダー: スクロールで影と背景を強調 */
#site-header {
    transition: box-shadow 0.3s ease, background-color 0.3s ease;
}
#site-header.is-scrolled {
    box-shadow: 0 4px 20px rgba(11, 30, 51, 0.08);
}

/* ロゴ */
.brand-logo {
    height: 2.25rem;
    width: auto;
}

/* ヒーロー: グラデーション背景とふわふわ動く光彩 */
.hero-section {
    position: relative;
    overflow: hidden;
    background: linear-gradient(150deg, var(--droplet-navy) 0%, #0f2942 55%, #103349 100%);
}

.hero-blob {
    position: absolute;
    border-radius: 9999px;
    filter: blur(70px);
    opacity: 0.55;
    animation: blob-float 12s ease-in-out infinite;
    pointer-events: none;
}
.hero-blob.blob-cyan {
    width: 420px;
    height: 420px;
    background: var(--droplet-blue);
    top: -120px;
    right: -100px;
}
.hero-blob.blob-pink {
    width: 320px;
    height: 320px;
    background: var(--droplet-pink);
    bottom: -100px;
    left: -80px;
    animation-delay: -4s;
}
.hero-blob.blob-yellow {
    width: 260px;
    height: 260px;
    background: var(--droplet-yellow);
    bottom: 10%;
    right: 8%;
    opacity: 0.35;
    animation-delay: -8s;
}

@keyframes blob-float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(20px, -30px) scale(1.08); }
}

.hero-logo {
    filter: drop-shadow(0 20px 40px rgba(0, 209, 232, 0.25));
}

/* ボタン */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.85rem 2rem;
    border-radius: 9999px;
    font-weight: 700;
    font-size: 0.9rem;
    transition: transform 0.25s ease, box-shadow 0.25s ease, background-color 0.25s ease, color 0.25s ease;
    white-space: nowrap;
}
.btn:hover {
    transform: translateY(-2px);
}
.btn-primary {
    background-color: var(--droplet-blue);
    color: var(--droplet-navy);
    box-shadow: 0 10px 25px rgba(0, 209, 232, 0.35);
}
.btn-primary:hover {
    box-shadow: 0 14px 30px rgba(0, 209, 232, 0.45);
}
.btn-outline {
    background-color: transparent;
    color: #ffffff;
    border: 1.5px solid rgba(255, 255, 255, 0.5);
}
.btn-outline:hover {
    background-color: rgba(255, 255, 255, 0.08);
    border-color: #ffffff;
}

/* スクロールリビール */
.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.08s; }
.reveal-delay-2 { transition-delay: 0.16s; }
.reveal-delay-3 { transition-delay: 0.24s; }

/* サービスカード・情報カード共通のホバー演出 */
.card-hover {
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
.card-hover:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(11, 30, 51, 0.08);
    border-color: var(--droplet-blue);
}

/* アイコンバッジ */
.icon-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.75rem;
    height: 2.75rem;
    border-radius: 0.75rem;
    background-color: rgba(0, 209, 232, 0.1);
    color: var(--droplet-blue);
    flex-shrink: 0;
}

/* モバイルナビ */
#mobile-nav {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
}
#mobile-nav.is-open {
    max-height: 24rem;
}

/* ハンバーガーアイコン */
.hamburger-line {
    transition: transform 0.3s ease, opacity 0.3s ease;
}
#nav-toggle.is-open .line-1 { transform: translateY(6px) rotate(45deg); }
#nav-toggle.is-open .line-2 { opacity: 0; }
#nav-toggle.is-open .line-3 { transform: translateY(-6px) rotate(-45deg); }

/* トップへ戻るボタン */
#back-to-top {
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px);
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease;
}
#back-to-top.is-visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* アクティブなナビリンク */
.nav-link.is-active {
    color: var(--droplet-blue);
    font-weight: 700;
}

/* ミッションセクションの引用符アイコン */
.quote-mark {
    color: var(--droplet-blue);
    opacity: 0.5;
}