/* ============================================================
   U asked time
   START SCREEN
   ============================================================ */


/* ============================================================
   基本設定
   ============================================================ */

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;

    width: 100%;
    min-height: 100%;

    font-family:
        "Noto Sans JP",
        "Yu Gothic",
        "Hiragino Kaku Gothic ProN",
        sans-serif;

    background: #080b12;
    color: #ffffff;
}


body {
    min-height: 100vh;
}


/* ============================================================
   START SCREEN
   ============================================================ */

.start-screen {

    position: relative;

    min-height: 100vh;

    overflow: hidden;

    display: flex;
    justify-content: center;

    padding: 60px 20px 40px;

    background:
        radial-gradient(
            circle at 50% 20%,
            rgba(60, 90, 140, 0.18),
            transparent 45%
        ),
        #080b12;
}


/* ============================================================
   背景グリッド
   ============================================================ */

.background-grid {

    position: fixed;

    inset: 0;

    pointer-events: none;

    opacity: 0.12;

    background-image:
        linear-gradient(
            rgba(255,255,255,0.08) 1px,
            transparent 1px
        ),
        linear-gradient(
            90deg,
            rgba(255,255,255,0.08) 1px,
            transparent 1px
        );

    background-size: 50px 50px;

    transform:
        perspective(500px)
        rotateX(55deg)
        scale(1.5);

    transform-origin: center bottom;
}


/* ============================================================
   背景グロー
   ============================================================ */

.background-glow {

    position: fixed;

    width: 600px;
    height: 600px;

    left: 50%;
    top: 30%;

    transform: translate(-50%, -50%);

    border-radius: 50%;

    background:
        radial-gradient(
            circle,
            rgba(80, 130, 200, 0.08),
            transparent 70%
        );

    pointer-events: none;
}


/* ============================================================
   コンテナ
   ============================================================ */

.start-container {

    position: relative;

    z-index: 1;

    width: 100%;
    max-width: 720px;

    margin: auto;

    text-align: center;
}


/* ============================================================
   TITLE
   ============================================================ */

.title-area {

    margin-bottom: 35px;
}


.title-sub {

    margin: 0 0 10px;

    font-size: 12px;

    letter-spacing: 0.35em;

    color: #8995a8;
}


.title-area h1 {

    margin: 0;

    font-family:
        "Times New Roman",
        "Yu Mincho",
        "Hiragino Mincho ProN",
        serif;

    font-size: clamp(42px, 9vw, 76px);

    font-weight: 400;

    letter-spacing: 0.08em;

    line-height: 1.1;

    color: #ffffff;

    text-shadow:
        0 0 20px rgba(255,255,255,0.12);
}


.title-line {

    margin: 18px 0 0;

    font-size: 13px;

    letter-spacing: 0.2em;

    color: #8d99aa;
}


/* ============================================================
   MAIN IMAGE
   ============================================================ */

.main-image {

    position: relative;

    width: 100%;

    margin: 0 auto 45px;

    overflow: hidden;

    border: 1px solid rgba(255,255,255,0.16);

    background: #111722;

    box-shadow:
        0 20px 60px rgba(0,0,0,0.45);
}


.main-image::after {

    content: "";

    position: absolute;

    inset: 0;

    pointer-events: none;

    background:
        linear-gradient(
            180deg,
            rgba(0,0,0,0.05),
            rgba(0,0,0,0.35)
        );
}


.main-image img {

    display: block;

    width: 100%;

    height: auto;

    min-height: 260px;

    object-fit: cover;
}


/* ============================================================
   DESCRIPTION
   ============================================================ */

.description {

    max-width: 600px;

    margin: 0 auto 45px;

    padding: 0 20px;

    text-align: left;
}


.description h2 {

    margin: 0 0 25px;

    text-align: center;

    font-size: 13px;

    font-weight: 500;

    letter-spacing: 0.35em;

    color: #8d99aa;
}


.description p {

    margin: 0 0 16px;

    font-size: 14px;

    line-height: 2.1;

    letter-spacing: 0.05em;

    color: #c8ced8;
}


.description p:last-child {

    margin-bottom: 0;
}


/* ============================================================
   START AREA
   ============================================================ */

.start-area {

    margin-bottom: 35px;
}


/* ============================================================
   START BUTTON
   ============================================================ */

.start-button {

    position: relative;

    display: flex;

    flex-direction: column;

    align-items: center;
    justify-content: center;

    width: 100%;

    min-height: 105px;

    padding: 20px;

    text-decoration: none;

    border: 1px solid rgba(255,255,255,0.55);

    background:
        linear-gradient(
            135deg,
            rgba(255,255,255,0.08),
            rgba(255,255,255,0.02)
        );

    color: #ffffff;

    transition:
        background 0.25s ease,
        border-color 0.25s ease,
        transform 0.25s ease,
        box-shadow 0.25s ease;
}


.start-button::before {

    content: "";

    position: absolute;

    inset: 5px;

    border: 1px solid rgba(255,255,255,0.08);

    pointer-events: none;
}


.start-button:hover {

    transform: translateY(-3px);

    border-color: #ffffff;

    background:
        linear-gradient(
            135deg,
            rgba(255,255,255,0.14),
            rgba(255,255,255,0.04)
        );

    box-shadow:
        0 10px 35px rgba(0,0,0,0.35);
}


.start-button:active {

    transform: translateY(0);
}


.start-button-main {

    font-family:
        "Times New Roman",
        serif;

    font-size: 30px;

    letter-spacing: 0.25em;

    margin-left: 0.25em;
}


.start-button-sub {

    margin-top: 7px;

    font-size: 11px;

    letter-spacing: 0.15em;

    color: #9da7b7;
}


/* ============================================================
   LINKS
   ============================================================ */

.links-area {

    display: grid;

    grid-template-columns: 1fr 1fr;

    gap: 12px;

    width: 100%;
}


/* ============================================================
   LINK BUTTON
   ============================================================ */

.link-button {

    display: flex;

    align-items: center;

    gap: 13px;

    min-height: 68px;

    padding: 12px 16px;

    text-decoration: none;

    text-align: left;

    border: 1px solid rgba(255,255,255,0.13);

    background: rgba(255,255,255,0.035);

    color: #ffffff;

    transition:
        background 0.2s ease,
        border-color 0.2s ease,
        transform 0.2s ease;
}


.link-button:hover {

    transform: translateY(-2px);

    background: rgba(255,255,255,0.07);

    border-color: rgba(255,255,255,0.35);
}


/* ============================================================
   LINK ICON
   ============================================================ */

.link-icon {

    display: flex;

    align-items: center;
    justify-content: center;

    flex-shrink: 0;

    width: 35px;
    height: 35px;

    border: 1px solid rgba(255,255,255,0.25);

    font-size: 18px;

    color: #ffffff;
}


/* ============================================================
   LINK TEXT
   ============================================================ */

.link-button strong {

    display: block;

    margin-bottom: 4px;

    font-size: 11px;

    font-weight: 500;

    letter-spacing: 0.15em;
}


.link-button small {

    display: block;

    font-size: 10px;

    color: #8995a8;

    line-height: 1.4;
}


/* ============================================================
   FOOTER
   ============================================================ */

.start-footer {

    margin-top: 50px;

    padding-top: 20px;

    border-top: 1px solid rgba(255,255,255,0.08);
}


.start-footer p {

    margin: 0;

    font-family:
        "Times New Roman",
        serif;

    font-size: 12px;

    letter-spacing: 0.2em;

    color: #626c7c;
}


/* ============================================================
   MOBILE
   ============================================================ */

@media (max-width: 600px) {

    .start-screen {

        padding:
            40px 15px 30px;
    }


    .title-area {

        margin-bottom: 25px;
    }


    .title-area h1 {

        font-size: 42px;

        letter-spacing: 0.04em;
    }


    .title-line {

        font-size: 11px;

        letter-spacing: 0.12em;
    }


    .main-image {

        margin-bottom: 35px;
    }


    .main-image img {

        min-height: 200px;
    }


    .description {

        padding: 0 10px;

        margin-bottom: 35px;
    }


    .description p {

        font-size: 13px;

        line-height: 1.9;
    }


    .start-button {

        min-height: 95px;
    }


    .links-area {

        grid-template-columns: 1fr;

        gap: 10px;
    }

}