/* ===== Concept View Page - AMAGAKERU ===== */

body {
    background-color: #050a18;
    overflow-x: hidden;
    overflow-y: scroll;
    -webkit-overflow-scrolling: touch;
}

/* ===== Common Section Styles ===== */

.concept_main {
    width: 100%;
    position: relative;
}

.concept_section {
    position: relative;
    width: 100%;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    overflow: hidden;
    /* Override the global section fade-in since we use our own */
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
}

/* ===== Reveal Animation ===== */

.concept_reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.9s cubic-bezier(0.22, 1, 0.36, 1),
                transform 0.9s cubic-bezier(0.22, 1, 0.36, 1);
}

.concept_reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.concept_hero_text {
    transform: translateY(50px);
    transition: opacity 1.2s cubic-bezier(0.22, 1, 0.36, 1),
                transform 1.2s cubic-bezier(0.22, 1, 0.36, 1);
}

/* =======================================
   Section 1: The Definition
   ======================================= */

.concept_s1 {
    min-height: 100vh;
    padding: 0;
}

.concept_s1_bg {
    position: absolute;
    top: -10%;
    left: 0;
    right: 0;
    bottom: -10%;
    background: linear-gradient(180deg,
        #050a18 0%,
        #0a1128 20%,
        #0f1a3a 50%,
        #132350 80%,
        #0a1128 100%
    );
    z-index: 0;
}

.concept_s1_glow {
    position: absolute;
    width: 500px;
    height: 500px;
    bottom: -100px;
    left: 50%;
    transform: translateX(-50%);
    background: radial-gradient(ellipse, rgba(100, 140, 220, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

/* Stars */
.concept_stars {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.concept_star {
    position: absolute;
    width: 2px;
    height: 2px;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 50%;
    animation: conceptStarTwinkle 3s ease-in-out infinite;
}

@keyframes conceptStarTwinkle {
    0%, 100% { opacity: 0.2; }
    50% { opacity: 1; }
}

/* Content */
.concept_s1_content {
    position: relative;
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 0 24px 120px;
    min-height: 100vh;
}

.concept_hero_full {
    width: 100%;
    height: 100dvh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
}

.concept_s1_lead {
    font-family: "Zen Old Mincho", serif;
    font-weight: 900;
    font-size: clamp(20px, 5vw, 52px);
    color: #e8e0d4;
    letter-spacing: 0.15em;
    line-height: 1.4;
    text-shadow: 0 0 60px rgba(246, 220, 159, 0.15);
    white-space: nowrap;
}

.concept_s1_divider {
    width: 1px;
    height: 60px;
    background: linear-gradient(180deg, transparent, rgba(246, 220, 159, 0.4), transparent);
    margin: 40px 0;
}

.concept_s1_block {
    max-width: 620px;
    margin-top: 80px;
}

.concept_s1_ruby {
    margin-bottom: 0;
}

.concept_kanji {
    font-family: "Zen Old Mincho", serif;
    font-weight: 900;
    font-size: clamp(24px, 4vw, 40px);
    color: #f6dc9f;
    letter-spacing: 0.1em;
    text-shadow: 0 0 30px rgba(246, 220, 159, 0.2);
}

.concept_reading {
    display: block;
    font-family: "Noto Sans JP", sans-serif;
    font-weight: 300;
    font-size: 13px;
    letter-spacing: 0.3em;
    color: rgba(232, 224, 212, 0.4);
    margin-top: 8px;
}

.concept_s1_body {
    font-family: "Shippori Mincho", serif;
    font-weight: 500;
    font-size: clamp(14px, 2.5vw, 17px);
    color: rgba(232, 224, 212, 0.75);
    line-height: 2.2;
    margin-bottom: 20px;
}

/* Scroll Hint */
.concept_scroll_hint {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%) translateY(30px);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    z-index: 20;
}

.concept_scroll_hint.is-visible {
    transform: translateX(-50%) translateY(0);
}

.concept_scroll_text {
    font-family: "Noto Sans JP", sans-serif;
    font-size: 10px;
    font-weight: 500;
    letter-spacing: 2px;
    color: rgba(232, 224, 212, 0.35);
    text-transform: uppercase;
}

.concept_scroll_line {
    display: block;
    width: 1px;
    height: 32px;
    background: rgba(232, 224, 212, 0.15);
    position: relative;
    overflow: hidden;
}

.concept_scroll_line::after {
    content: "";
    position: absolute;
    bottom: -100%;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(246, 220, 159, 0.6);
    animation: conceptScrollDown 1.8s ease infinite;
}

@keyframes conceptScrollDown {
    0% { bottom: -100%; }
    50% { bottom: 0; }
    100% { bottom: 100%; }
}

/* =======================================
   Section 2: The Spirit
   ======================================= */

.concept_s2 {
    min-height: 100vh;
}

.concept_s2_bg {
    position: absolute;
    top: -10%;
    left: 0;
    right: 0;
    bottom: -10%;
    background: linear-gradient(180deg,
        #0a1128 0%,
        #0d0d0d 20%,
        #111111 50%,
        #0d0d0d 80%,
        #050a18 100%
    );
    z-index: 0;
}

.concept_s2_gradient {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 30% 50%, rgba(246, 220, 159, 0.03) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 50%, rgba(218, 181, 132, 0.03) 0%, transparent 50%);
    pointer-events: none;
}

/* Particles */
.concept_s2_particles {
    position: absolute;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
}

.concept_s2_particle {
    position: absolute;
    width: 3px;
    height: 3px;
    background: rgba(246, 220, 159, 0.4);
    border-radius: 50%;
    animation: conceptParticleRise 10s linear infinite;
}

@keyframes conceptParticleRise {
    from {
        transform: translateY(100%) scale(0);
        opacity: 0;
    }
    10% {
        opacity: 1;
        transform: translateY(90%) scale(1);
    }
    90% {
        opacity: 0.4;
    }
    to {
        transform: translateY(-20%) scale(0.3);
        opacity: 0;
    }
}

/* Content */
.concept_s2_content {
    position: relative;
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 120px 24px 100px;
    max-width: 680px;
    margin: 0 auto;
}

.concept_s2_lead {
    font-family: "Zen Old Mincho", serif;
    font-weight: 900;
    font-size: clamp(20px, 5vw, 48px);
    color: #f6dc9f;
    letter-spacing: 0.12em;
    line-height: 1.4;
    text-shadow: 0 0 40px rgba(246, 220, 159, 0.15);
    white-space: nowrap;
}

.concept_s2_divider {
    width: 1px;
    height: 60px;
    background: linear-gradient(180deg, transparent, rgba(246, 220, 159, 0.3), transparent);
    margin: 44px 0;
}

.concept_s2_divider_thin {
    width: 40px;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(246, 220, 159, 0.25), transparent);
    margin: 36px auto;
}

.concept_s2_block {
    max-width: 620px;
}

.concept_s2_body {
    font-family: "Shippori Mincho", serif;
    font-weight: 500;
    font-size: clamp(14px, 2.5vw, 17px);
    color: rgba(232, 224, 212, 0.7);
    line-height: 2.2;
    margin-bottom: 16px;
}

.concept_s2_emphasis {
    font-family: "Zen Old Mincho", serif;
    font-weight: 700;
    font-size: clamp(16px, 3vw, 20px);
    color: #e8e0d4;
    line-height: 2;
    margin: 20px 0;
    letter-spacing: 0.05em;
}

/* =======================================
   Section 3: The Statement
   ======================================= */

.concept_s3 {
    min-height: auto;
    padding-bottom: 0;
}

.concept_s3_bg {
    position: absolute;
    top: -10%;
    left: 0;
    right: 0;
    bottom: -10%;
    background: linear-gradient(180deg,
        #050a18 0%,
        #0a1530 15%,
        #152a55 35%,
        #1e3c72 50%,
        #2a5298 65%,
        #3a7bd5 80%,
        #4a90e2 90%,
        #5fa0ef 100%
    );
    z-index: 0;
}

.concept_s3_rays {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 50% 100%, rgba(255,255,255,0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 30% 80%, rgba(246,220,159,0.05) 0%, transparent 40%),
        radial-gradient(ellipse at 70% 80%, rgba(246,220,159,0.05) 0%, transparent 40%);
    pointer-events: none;
}

.concept_s3_overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg,
        rgba(5, 10, 24, 0.6) 0%,
        rgba(5, 10, 24, 0.2) 30%,
        transparent 60%,
        rgba(255, 255, 255, 0.03) 100%
    );
    pointer-events: none;
}

/* Content */
.concept_s3_content {
    position: relative;
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 120px 24px 80px;
    max-width: 680px;
    margin: 0 auto;
}

.concept_s3_lead {
    font-family: "Zen Old Mincho", serif;
    font-weight: 900;
    font-size: clamp(20px, 5vw, 48px);
    color: #ffffff;
    letter-spacing: 0.12em;
    line-height: 1.4;
    text-shadow: 0 0 40px rgba(255, 255, 255, 0.15);
    white-space: nowrap;
}

.concept_s3_divider {
    width: 1px;
    height: 60px;
    background: linear-gradient(180deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    margin: 44px 0;
}

.concept_s3_divider_thin {
    width: 40px;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    margin: 36px auto;
}

.concept_s3_block {
    max-width: 620px;
}

.concept_s3_body {
    font-family: "Shippori Mincho", serif;
    font-weight: 500;
    font-size: clamp(14px, 2.5vw, 17px);
    color: rgba(255, 255, 255, 0.8);
    line-height: 2.2;
    margin-bottom: 16px;
}

.concept_s3_accent {
    font-family: "Zen Old Mincho", serif;
    font-weight: 700;
    font-size: clamp(16px, 3vw, 20px);
    color: #fff;
    line-height: 2;
    margin: 20px 0;
    letter-spacing: 0.05em;
    text-shadow: 0 0 20px rgba(255, 255, 255, 0.1);
}

.concept_s3_finale {
    margin-top: 16px;
}

/* ===== Finale ===== */

.concept_finale {
    margin-top: 60px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.concept_finale_line {
    width: 1px;
    height: 40px;
    background: linear-gradient(180deg, transparent, rgba(246, 220, 159, 0.5), transparent);
}

.concept_finale_title {
    font-family: "Zen Old Mincho", serif;
    font-weight: 900;
    font-size: clamp(24px, 5vw, 42px);
    color: #f6dc9f;
    letter-spacing: 0.15em;
    line-height: 1.3;
    text-shadow: 0 0 50px rgba(246, 220, 159, 0.25);
}

.concept_finale_sub {
    font-family: "Shippori Mincho", serif;
    font-weight: 600;
    font-size: clamp(15px, 3vw, 20px);
    color: rgba(255, 255, 255, 0.85);
    letter-spacing: 0.1em;
    line-height: 1.6;
}

/* ===== CTA ===== */

.concept_cta {
    margin-top: 80px;
    padding-bottom: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}

.concept_cta_logo {
    width: clamp(180px, 40vw, 300px);
    height: auto;
    opacity: 0.9;
    filter: brightness(1.3) contrast(0.9);
}

.concept_cta_date {
    font-family: "Noto Sans JP", sans-serif;
    font-weight: 400;
    font-size: clamp(13px, 2.5vw, 16px);
    letter-spacing: 0.2em;
    color: rgba(255, 255, 255, 0.6);
}

.concept_cta_date small {
    font-size: 0.8em;
    opacity: 0.7;
}

.concept_cta_btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 12px;
    padding: 14px 32px;
    font-family: "Shippori Mincho", serif;
    font-weight: 600;
    font-size: 15px;
    color: #f6dc9f;
    text-decoration: none;
    border: 1px solid rgba(246, 220, 159, 0.4);
    border-radius: 50px;
    transition: all 0.4s cubic-bezier(0.22, 1, 0.36, 1);
    position: relative;
    overflow: hidden;
}

.concept_cta_btn::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(246, 220, 159, 0.1), transparent);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.concept_cta_btn:hover {
    border-color: #f6dc9f;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(246, 220, 159, 0.15);
}

.concept_cta_btn:hover::before {
    opacity: 1;
}

.concept_cta_btn span {
    position: relative;
    z-index: 1;
    transition: transform 0.3s ease;
}

.concept_cta_btn:hover span:first-child {
    transform: translateX(-3px);
}

/* ===== Responsive: PC ===== */

@media screen and (min-width: 1024px) {
    .concept_s1_content {
        padding: 0 40px 140px;
    }

    .concept_s1_glow {
        width: 800px;
        height: 800px;
        bottom: -200px;
    }

    .concept_s2_content,
    .concept_s3_content {
        padding: 140px 40px 120px;
    }

    .concept_s1_body,
    .concept_s2_body,
    .concept_s3_body {
        line-height: 2.4;
    }
}

/* ===== Responsive: Tablet ===== */

@media screen and (min-width: 768px) and (max-width: 1023px) {
    .concept_s1_content {
        padding: 0 32px 120px;
    }

    .concept_s2_content,
    .concept_s3_content {
        padding: 120px 32px 100px;
    }
}

/* ===== Responsive: Small mobile ===== */

@media screen and (max-width: 400px) {
    .concept_s1_content {
        padding: 0 20px 80px;
    }

    .concept_s2_content,
    .concept_s3_content {
        padding: 100px 20px 80px;
    }

    .concept_s1_divider,
    .concept_s2_divider,
    .concept_s3_divider {
        height: 40px;
        margin: 32px 0;
    }

    .concept_s2_divider_thin,
    .concept_s3_divider_thin {
        margin: 24px auto;
    }

    .concept_s1_body,
    .concept_s2_body,
    .concept_s3_body {
        line-height: 2;
    }

    .concept_finale {
        margin-top: 40px;
    }

    .concept_finale_line {
        height: 28px;
    }

    .concept_cta {
        margin-top: 60px;
    }

    .concept_cta_btn {
        font-size: 13px;
        padding: 12px 26px;
    }
}