/* -----------------------------------------------------------------------------
 * TOP page — front-page.php 専用スタイル。
 * design_handoff_sakazuki_site/pages/SAKAZUKI Top.dc.html に忠実に対応。
 * --------------------------------------------------------------------------- */

/* ============================================================
 * Background drift — ページ全面の背景アニメ
 * ========================================================== */

@keyframes sk-bg-drift {
    0%   { transform: scale(1) translateY(0); }
    50%  { transform: scale(1.06) translateY(-1.5%); }
    100% { transform: scale(1) translateY(0); }
}

.top-bg {
    position: fixed;
    inset: -4%;
    z-index: var(--sk-z-bg);
    background: url("../../img/top_bg.png") center / cover no-repeat;
    animation: sk-bg-drift 24s ease-in-out infinite;
    pointer-events: none;
}

.top-main {
    position: relative;
    z-index: var(--sk-z-content);
    overflow-x: clip;
}

/* ============================================================
 * HERO — ガラスバー + 大見出し
 * ========================================================== */

.top-hero {
    position: relative;
    min-height: 92vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 120px 8vw 140px;
}

.top-hero__glass-svg {
    position: absolute;
    width: 0;
    height: 0;
}

/* 斜め38° / 太さ280px / blur10px / 屈折はChromium系のみ (feDisplacementMap) */
.top-hero__glass {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 250%;
    height: 280px;
    transform: translate(-50%, -50%) rotate(38deg);
    background: linear-gradient(
        135deg,
        rgba(255, 255, 255, 0.6) 0%,
        rgba(255, 255, 255, 0.21) 35%,
        rgba(255, 255, 255, 0.12) 55%,
        rgba(255, 255, 255, 0.39) 100%
    );
    -webkit-backdrop-filter: blur(10px) saturate(1.4) brightness(1.07);
    /* Chromium 系のみ SVG フィルタで屈折 (feDisplacementMap)。他ブラウザは blur のみに自然フォールバック */
    backdrop-filter: url(#sk-glass-refract) blur(10px) saturate(1.4) brightness(1.07);
    pointer-events: none;
}

.top-hero__title {
    position: relative;
    z-index: 1;
    margin: 0;
    font-size: clamp(44px, 5.2vw, 76px);
    font-weight: var(--sk-fw-black);
    line-height: 1.55;
    letter-spacing: var(--sk-tracking-body);
}

.top-hero__lead {
    position: relative;
    z-index: 1;
    margin: 36px 0 0;
    font-size: 16px;
    font-weight: var(--sk-fw-bold);
    line-height: var(--sk-line-body);
    letter-spacing: var(--sk-tracking-wide);
}

/* ============================================================
 * ABOUT
 * ========================================================== */

.top-about {
    background: #fff;
    padding: 220px 8vw 240px;
    clip-path: polygon(0 0, 100% 150px, 100% 100%, 0 calc(100% - 150px));
    margin-top: -60px;
}

.top-about__grid {
    max-width: var(--sk-container-max);
    margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(220px, 1fr) 2fr;
    gap: 60px;
    align-items: center;
}

.top-about__logo {
    width: 100%;
    max-width: 300px;
    justify-self: center;
}

/* セクション見出し共通 (h2 + 日本語ラベル) */
.top-section-heading {
    display: flex;
    align-items: baseline;
    gap: 16px;
}

.top-section-heading h2 {
    margin: 0;
    font-size: 30px;
    font-weight: var(--sk-fw-bold);
    letter-spacing: var(--sk-tracking-wide);
}

.top-section-heading__label {
    font-size: 13px;
    font-weight: var(--sk-fw-bold);
    letter-spacing: 0.1em;
}

.top-about__tagline {
    margin: 28px 0 0;
    font-size: clamp(24px, 2.3vw, 32px);
    font-weight: var(--sk-fw-black);
    line-height: 1.8;
    letter-spacing: 0.05em;
}

.top-about__body {
    margin: 28px 0 0;
    font-size: 16px;
    font-weight: var(--sk-fw-bold);
    line-height: 2.2;
    letter-spacing: var(--sk-tracking-body);
}

/* ============================================================
 * SERVICES
 * ========================================================== */

.top-services {
    padding: 100px 24px 120px;
}

.top-services__card {
    max-width: 1240px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.45);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-radius: 40px;
    padding: 90px clamp(32px, 5vw, 80px);
}

.top-services__row {
    display: grid;
    grid-template-columns: minmax(240px, 420px) 1fr;
    gap: 56px;
    align-items: center;
    padding: 48px 0;
    border-bottom: 1px solid #ffffff;
}

.top-services__row:last-child {
    border-bottom: none;
}

.top-services__thumb {
    width: 100%;
    aspect-ratio: 452 / 187;
    border-radius: 16px;
    background-size: cover;
    background-position: center;
}

.top-services__head {
    display: flex;
    align-items: center;
    gap: 20px;
}

.top-services__num {
    font-size: 40px;
    font-weight: var(--sk-fw-regular);
    letter-spacing: var(--sk-tracking-tight);
}

.top-services__div {
    width: 1px;
    height: 36px;
    background: var(--sk-color-text);
}

.top-services__title {
    margin: 0;
    font-size: 40px;
    font-weight: var(--sk-fw-medium);
    letter-spacing: var(--sk-tracking-body);
}

.top-services__desc {
    margin: 18px 0 0;
    font-size: 16px;
    font-weight: var(--sk-fw-bold);
    line-height: 2;
    letter-spacing: 0.05em;
    max-width: 560px;
}

.top-services__more {
    display: flex;
    justify-content: flex-end;
    margin-top: 20px;
}

/* ============================================================
 * View more (共通の矢印リンク)
 * ========================================================== */

.top-view-more {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    font-size: 17px;
    letter-spacing: var(--sk-tracking-tight);
}

.top-view-more--sm {
    font-size: 16px;
    font-weight: var(--sk-fw-regular);
}

/* ============================================================
 * WORKS
 * ========================================================== */

.top-works {
    background: #fff url("../../img/works_bg.png") center / cover no-repeat;
    padding: 140px 8vw;
}

.top-works__inner {
    max-width: var(--sk-container-max);
    margin: 0 auto;
}

.top-works__grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 32px 28px;
    margin-top: 44px;
}

.top-works__card {
    display: block;
}

.top-works__card:hover {
    transform: translateY(-4px);
    -webkit-text-fill-color: currentcolor;
    background: none;
    color: inherit;
}

.top-works__thumb {
    aspect-ratio: 16 / 9;
    background: #c2c2c2;
    border-radius: 4px;
}

.top-works__title {
    margin: 14px 0 0;
    font-size: 16px;
    font-weight: var(--sk-fw-bold);
    letter-spacing: 0.05em;
}

.top-works__tags {
    margin: 4px 0 0;
    font-size: 13px;
    font-weight: var(--sk-fw-medium);
    color: var(--sk-color-muted);
    letter-spacing: 0.05em;
}

.top-works__more {
    display: flex;
    justify-content: center;
    margin-top: 56px;
}

/* ============================================================
 * KNOWLEDGE
 * ========================================================== */

.top-knowledge {
    background: url("../../img/knowledge_bg.png") center / cover no-repeat;
    padding: 110px 8vw 130px;
}

.top-knowledge__inner {
    max-width: var(--sk-container-max);
    margin: 0 auto;
}

.top-knowledge__grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
    margin-top: 40px;
}

.top-knowledge__card {
    display: block;
    background: #fff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 6px 24px rgba(10, 40, 80, 0.12);
}

.top-knowledge__card:hover {
    transform: translateY(-4px);
    box-shadow: var(--sk-shadow-card-hover);
    color: var(--sk-color-text);
    -webkit-text-fill-color: var(--sk-color-text);
    background: #fff;
}

.top-knowledge__thumb {
    aspect-ratio: 16 / 9;
    background: #c2c2c2;
}

.top-knowledge__body {
    padding: 16px 18px 20px;
}

.top-knowledge__date {
    margin: 0;
    font-size: 12px;
    color: var(--sk-color-muted);
    letter-spacing: var(--sk-tracking-body);
}

.top-knowledge__title {
    margin: 6px 0 0;
    font-size: 15px;
    font-weight: var(--sk-fw-bold);
    line-height: 1.8;
    letter-spacing: var(--sk-tracking-tight);
}

/* ============================================================
 * NEWS
 * ========================================================== */

.top-news {
    padding: 130px 8vw 160px;
}

.top-news__inner {
    max-width: var(--sk-container-max);
    margin: 0 auto;
}

.top-news__list {
    display: flex;
    flex-direction: column;
    margin-top: 44px;
    border-bottom: 1px solid var(--sk-rule-35);
}

.top-news__row {
    display: flex;
    gap: 40px;
    align-items: baseline;
    padding: 24px 4px;
    border-top: 1px solid var(--sk-rule-35);
}

.top-news__date {
    font-size: 14px;
    letter-spacing: var(--sk-tracking-tight);
    flex: none;
}

.top-news__title {
    font-size: 16px;
    font-weight: var(--sk-fw-bold);
    letter-spacing: 0.05em;
    transform-origin: left center;
}

.top-news__title:hover {
    transform: scale(1.03); /* 一覧行のみ 1.03（README仕様） */
}

.top-news__more {
    display: flex;
    justify-content: center;
    margin-top: 64px;
}

/* ============================================================
 * COMPANY
 * ========================================================== */

.top-company {
    padding: 0 16px;
}

.top-company__panel {
    background: var(--sk-color-bg-mint);
    border-radius: 28px 28px 0 0;
    padding: 110px clamp(32px, 6vw, 90px) 60px;
    max-width: 1408px;
    margin: 0 auto;
}

.top-company__inner {
    max-width: var(--sk-container-max);
    margin: 0 auto;
}

.top-company__grid {
    display: grid;
    grid-template-columns: minmax(240px, 1fr) 1.3fr;
    gap: 60px;
    align-items: center;
    margin-top: 40px;
}

.top-company__logo {
    width: 100%;
    max-width: 340px;
    justify-self: center;
}

.top-company__table {
    display: flex;
    flex-direction: column;
}

.top-company__row {
    display: grid;
    grid-template-columns: 110px 1fr;
    gap: 20px;
    padding: 18px 4px;
    border-top: 1px solid var(--sk-color-company-rule);
    font-size: 15px;
    letter-spacing: 0.05em;
    line-height: 2;
}

.top-company__row-key {
    font-weight: var(--sk-fw-bold);
}

.top-company__row-val {
    font-weight: var(--sk-fw-medium);
    white-space: pre-line;
}

.top-company__foot-rule {
    border-top: 1px solid var(--sk-color-company-rule);
}

/* ============================================================
 * Arrow (View more の丸+矢印) — TOP専用の40px版
 * ========================================================== */

.top-arrow {
    position: relative;
    width: 40px;
    height: 40px;
    border: 1px solid var(--sk-color-text);
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    overflow: visible;
}

.top-arrow svg {
    position: absolute;
    left: 8px;
}

/* ============================================================
 * Responsive — 1024 / 767
 * ========================================================== */

@media (max-width: 1024px) {
    .top-services__row {
        grid-template-columns: 1fr;
        gap: 28px;
    }
    .top-works__grid,
    .top-knowledge__grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .top-about__grid {
        gap: 44px;
    }
}

@media (max-width: 767px) {
    .top-hero {
        padding: 150px 7vw 110px;
    }
    .top-hero__title {
        font-size: clamp(32px, 9.6vw, 44px);
    }
    .top-hero__glass {
        height: 170px;
    }
    .top-about {
        padding: 120px 7vw 140px;
        clip-path: polygon(0 0, 100% 70px, 100% 100%, 0 calc(100% - 70px));
    }
    .top-about__grid {
        grid-template-columns: 1fr;
        gap: 36px;
    }
    .top-about__logo {
        max-width: 190px;
    }
    .top-services {
        padding: 60px 14px 80px;
    }
    .top-services__card {
        padding: 56px 22px;
        border-radius: 24px;
    }
    .top-services__num,
    .top-services__title {
        font-size: 26px;
    }
    .top-services__div {
        height: 22px;
    }
    .top-works {
        padding: 90px 6vw;
    }
    .top-works__grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }
    .top-knowledge {
        padding: 80px 6vw 100px;
    }
    .top-knowledge__grid {
        grid-template-columns: 1fr;
    }
    .top-news {
        padding: 90px 6vw 110px;
    }
    .top-news__row {
        flex-direction: column;
        gap: 4px;
    }
    .top-company__grid {
        grid-template-columns: 1fr;
        gap: 36px;
    }
    .top-company__logo {
        max-width: 240px;
    }
    .top-company__row {
        grid-template-columns: 90px 1fr;
        gap: 14px;
        font-size: 14px;
    }
}