/* FUI Splash - ガンダム／軍事オペレーション風 */
@font-face {
    font-family: 'GAU Root';
    src: url('font/GAU_Root_Nomal.ttf') format('truetype');
    font-weight: normal;
    font-style: normal;
}

:root {
    --fui-bg: #fafafa;
    --fui-text: #4b5563;
    --fui-text-dim: #9ca3af;
    --fui-text-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
    --fui-text-shadow-strong: 0 2px 4px rgba(0, 0, 0, 0.12);
    --fui-grid-line: rgba(0, 0, 0, 0.04);
    --fui-scanline: rgba(0, 0, 0, 0.03);
    --fui-border: rgba(0, 0, 0, 0.08);
}

/* 英字のみ GAU Root（スプラッシュ内の英語テキスト用） */
.fui-font-en {
    font-family: 'GAU Root', 'Share Tech Mono', 'Consolas', monospace;
}

.fui-sub-jp {
    font-family: 'Noto Sans JP', sans-serif;
}

/* Splash コンテナ */
.fui-splash {
    position: fixed;
    inset: 0;
    top: env(safe-area-inset-top);
    right: env(safe-area-inset-right);
    bottom: env(safe-area-inset-bottom);
    left: env(safe-area-inset-left);
    z-index: 10000;
    background: var(--fui-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.6s ease;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    cursor: pointer;
}

.fui-splash.hide {
    opacity: 0;
    pointer-events: none;
}

/* スキャンライン */
.fui-scanline {
    position: absolute;
    inset: 0;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        var(--fui-scanline) 2px,
        var(--fui-scanline) 4px
    );
    animation: fui-scanline-move 0.12s linear infinite;
    pointer-events: none;
}

@keyframes fui-scanline-move {
    0% { transform: translateY(0); }
    100% { transform: translateY(4px); }
}

/* グリッド */
.fui-grid {
    position: absolute;
    inset: 12%;
    background-image:
        linear-gradient(var(--fui-grid-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--fui-grid-line) 1px, transparent 1px);
    background-size: 24px 24px;
    pointer-events: none;
}

/* ビネット */
.fui-vignette {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at center, transparent 50%, rgba(0, 0, 0, 0.04) 100%);
    pointer-events: none;
}

/* 四隅 L 字フレーム */
.fui-frame {
    position: absolute;
    inset: 12%;
    pointer-events: none;
}

.fui-corner {
    position: absolute;
    width: 24px;
    height: 24px;
    border-color: var(--fui-border);
    border-style: solid;
    border-width: 0;
}

.fui-corner-tl {
    top: 0;
    left: 0;
    border-top-width: 2px;
    border-left-width: 2px;
}

.fui-corner-tr {
    top: 0;
    right: 0;
    border-top-width: 2px;
    border-right-width: 2px;
}

.fui-corner-bl {
    bottom: 0;
    left: 0;
    border-bottom-width: 2px;
    border-left-width: 2px;
}

.fui-corner-br {
    bottom: 0;
    right: 0;
    border-bottom-width: 2px;
    border-right-width: 2px;
}

/* Now Loading... (Phase 1〜3、TAP TO START 表示まで) */
.fui-loading-indicator {
    position: fixed;
    bottom: env(safe-area-inset-bottom, 0);
    right: env(safe-area-inset-right, 0);
    margin: 16px;
    font-size: 0.75rem;
    color: var(--fui-text-dim);
    letter-spacing: 0.1em;
    text-shadow: var(--fui-text-shadow);
    z-index: 5;
    opacity: 0.8;
}

.fui-loading-indicator.hidden {
    display: none;
}

/* 中央コンテンツ */
.fui-center {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 20px;
    max-width: 90%;
}

/* フェーズ共通 */
.fui-phase {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.fui-phase.active {
    position: relative;
    left: auto;
    top: auto;
    transform: none;
    visibility: visible;
    opacity: 1;
}

/* Phase 1: Welcome */
.fui-welcome {
    font-size: clamp(1.2rem, 4vw, 1.8rem);
    color: var(--fui-text);
    letter-spacing: 0.2em;
    text-shadow: var(--fui-text-shadow);
    animation: fui-blink 1s ease-in-out;
}

@keyframes fui-blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.15; }
}

/* Phase 2: Typewriter */
.fui-typewriter-wrap {
    font-size: clamp(0.7rem, 2.5vw, 1rem);
    color: var(--fui-text);
    line-height: 1.6;
    max-width:  min(90vw, 520px);
    text-align: left;
    display: inline-block;
    text-shadow: var(--fui-text-shadow);
}

.fui-cursor {
    display: inline-block;
    width: 2px;
    height: 1em;
    background: var(--fui-text);
    margin-left: 2px;
    vertical-align: text-bottom;
    animation: fui-cursor-blink 0.6s step-end infinite;
}

.fui-phase:not(.active) .fui-cursor {
    display: none;
}

@keyframes fui-cursor-blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

/* Phase 3: Acronym */
.fui-acronym-phase {
    position: relative;
}

.fui-acronym-lower,
.fui-acronym-upper {
    font-size: clamp(1.2rem, 5vw, 2.2rem);
    color: var(--fui-text);
    letter-spacing: 0.15em;
    text-shadow: var(--fui-text-shadow-strong);
}

.fui-acronym-upper {
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    opacity: 0;
    transition: opacity 1s ease;
}

.fui-acronym-phase.fade-done .fui-acronym-lower {
    opacity: 0;
}

.fui-acronym-phase.fade-done .fui-acronym-upper {
    opacity: 1;
}

/* Phase 4: Final */
#fui-phase-final .fui-sub,
#fui-phase-final .fui-desc {
    font-size: clamp(0.75rem, 2.5vw, 1rem);
    color: var(--fui-text-dim);
    letter-spacing: 0.1em;
    margin-bottom: 8px;
    text-shadow: var(--fui-text-shadow);
}

#fui-phase-final .fui-line {
    width: 40px;
    height: 1px;
    background: var(--fui-border);
    margin: 12px auto;
}

#fui-phase-final .fui-acronym {
    font-size: clamp(1.2rem, 5vw, 2rem);
    color: var(--fui-text);
    letter-spacing: 0.12em;
    margin: 8px 0;
    text-shadow: var(--fui-text-shadow-strong);
    animation: fui-glow 2.5s ease-in-out infinite;
}

@keyframes fui-glow {
    0%, 100% { opacity: 1; text-shadow: 0 2px 4px rgba(0, 0, 0, 0.12); }
    50% { opacity: 0.85; text-shadow: 0 2px 8px rgba(0, 0, 0, 0.18); }
}

.fui-tap {
    margin-top: 28px;
    font-size: clamp(0.7rem, 2.5vw, 0.95rem);
    color: var(--fui-text);
    letter-spacing: 0.25em;
    text-shadow: var(--fui-text-shadow);
    opacity: 0.9;
    animation: fui-tap-pulse 1.5s ease-in-out infinite;
}

@keyframes fui-tap-pulse {
    0%, 100% { opacity: 0.7; }
    50% { opacity: 1; }
}