:root {
    --bg-dark: #05020a;
    --primary-color: #3d0c5a;
    --gold-accent: #e6b940;
    --gold-light: #fef0c7;
    --text-main: #f5f5f5;
    --text-sub: #a39ca8;
    --border-glass: rgba(230, 185, 64, 0.25);
    --bg-glass: rgba(15, 5, 25, 0.75);
    --white: #ffffff;
    
    --premium-shadow: 0 15px 45px rgba(0, 0, 0, 0.9);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Shippori Mincho', serif;
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    background-color: var(--bg-dark);
}

/* 妖しく美しい背景エフェクト */
.elegant-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 50% 50%, #3d0c5a 0%, #05020a 70%);
    animation: bgBreathe 10s infinite alternate ease-in-out;
    z-index: 0;
    pointer-events: none;
}

@keyframes bgBreathe {
    0% { transform: scale(1); opacity: 0.8; }
    100% { transform: scale(1.05); opacity: 1; }
}

.elegant-bg::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: linear-gradient(rgba(212, 175, 55, 0.05) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(212, 175, 55, 0.05) 1px, transparent 1px);
    background-size: 30px 30px;
    opacity: 0.5;
}

/* App Container */
.app-container {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 600px;
    height: 95vh;
    padding: 10px;
    display: flex;
    flex-direction: column;
}

/* 高級感のあるメインUI */
.chat-premium-box {
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-glass);
    border-radius: 15px;
    box-shadow: var(--premium-shadow);
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

/* Header */
.premium-header {
    padding: 30px 20px 25px;
    text-align: center;
    border-bottom: 1px solid var(--border-glass);
    background: linear-gradient(to bottom, rgba(61, 12, 90, 0.6), transparent);
}

.header-decoration {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    color: var(--gold-accent);
    margin-bottom: 10px;
}

.header-decoration .line {
    width: 40px;
    height: 1px;
    background: var(--gold-accent);
}

.header-decoration .diamond {
    font-size: 0.8rem;
}

.premium-header h1 {
    font-family: 'Shippori Mincho', serif;
    font-weight: 800;
    font-size: 1.9rem;
    line-height: 1.2;
    color: var(--gold-light);
    letter-spacing: 2px;
    margin-bottom: 8px;
    text-shadow: 0 0 15px rgba(230, 185, 64, 0.5);
}

.subtitle {
    font-size: 0.95rem;
    color: var(--text-sub);
    letter-spacing: 1.5px;
}

/* Chat Container */
.chat-container {
    flex: 1;
    padding: 25px 20px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.chat-container::-webkit-scrollbar {
    width: 4px;
}
.chat-container::-webkit-scrollbar-thumb {
    background: var(--gold-accent);
    border-radius: 2px;
}

.message {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    max-width: 90%;
    animation: fadeIn 0.8s ease forwards;
    opacity: 0;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.message.mentor {
    align-self: flex-start;
}

.message.user {
    align-self: flex-end;
    flex-direction: row-reverse;
}

/* 美しいイラストのアバター */
.premium-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    border: 2px solid var(--gold-accent);
    box-shadow: 0 0 15px rgba(212, 175, 55, 0.3);
    flex-shrink: 0;
    object-fit: cover;
}

.bubble {
    padding: 15px 20px;
    border-radius: 10px;
    font-size: 1rem;
    line-height: 1.6;
    position: relative;
    border: 1px solid var(--border-glass);
    letter-spacing: 0.5px;
}

/* アドバイザーの吹き出し（ダークパープル＆ゴールド） */
.message.mentor .bubble {
    background: linear-gradient(135deg, rgba(20, 5, 30, 0.95), rgba(61, 12, 90, 0.85));
    color: var(--gold-light);
    border-top-left-radius: 0;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.6);
}

.message.mentor .bubble::before {
    content: '';
    position: absolute;
    top: -1px;
    left: -10px;
    border-width: 0 10px 10px 0;
    border-style: solid;
    border-color: transparent var(--gold-accent) transparent transparent;
    opacity: 0.3;
}

/* ユーザーの吹き出し（ダークグレー） */
.message.user .bubble {
    background: rgba(30, 30, 40, 0.8);
    color: var(--white);
    border-top-right-radius: 0;
}

.message.user .bubble::before {
    content: '';
    position: absolute;
    top: -1px;
    right: -10px;
    border-width: 10px 10px 0 0;
    border-style: solid;
    border-color: var(--border-glass) transparent transparent transparent;
}

/* Loading Animation */
.loading-dots {
    display: flex;
    gap: 6px;
    padding: 5px;
}

.dot {
    width: 6px;
    height: 6px;
    background: var(--gold-accent);
    border-radius: 50%;
    animation: fadePulse 1.5s infinite;
}

.dot:nth-child(2) { animation-delay: 0.2s; }
.dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes fadePulse {
    0%, 100% { opacity: 0.2; transform: scale(0.8); }
    50% { opacity: 1; transform: scale(1.2); }
}

/* Controls Area */
.controls-area {
    padding: 15px 20px;
    background: rgba(10, 5, 16, 0.9);
    border-top: 1px solid var(--border-glass);
    display: flex;
    gap: 15px;
    align-items: center;
    position: relative;
}

.voice-btn {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: transparent;
    border: 1px solid var(--gold-accent);
    color: var(--gold-accent);
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    justify-content: center;
    align-items: center;
}

.voice-btn:hover {
    background: rgba(212, 175, 55, 0.1);
    box-shadow: 0 0 10px rgba(212, 175, 55, 0.3);
}

.voice-btn.recording {
    background: var(--gold-accent);
    color: var(--bg-dark);
    animation: glowGold 1.5s infinite alternate;
}

@keyframes glowGold {
    from { box-shadow: 0 0 5px rgba(212, 175, 55, 0.5); }
    to { box-shadow: 0 0 20px rgba(212, 175, 55, 0.9); }
}

.input-area {
    flex: 1;
    display: flex;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 5px;
    padding: 5px;
    border: 1px solid var(--border-glass);
    transition: border-color 0.3s;
}

.input-area:focus-within {
    border-color: var(--gold-accent);
    box-shadow: 0 0 10px rgba(212, 175, 55, 0.2);
}

.input-area input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--white);
    outline: none;
    font-size: 1rem;
    padding: 0 15px;
    font-family: 'Shippori Mincho', serif;
}

.input-area input::placeholder {
    color: rgba(255, 255, 255, 0.3);
}

.send-btn {
    width: 35px;
    height: 35px;
    border-radius: 5px;
    background: var(--gold-accent);
    border: none;
    color: var(--bg-dark);
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.2s;
}

.send-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 0 15px rgba(212, 175, 55, 0.5);
}

/* TTS Controls Area */
.tts-controls {
    padding: 12px 20px;
    background: #000;
    color: var(--gold-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    letter-spacing: 1px;
}

.tts-toggle-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.tts-toggle-label input {
    width: 14px;
    height: 14px;
    cursor: pointer;
    accent-color: var(--gold-accent);
}

.tts-settings {
    display: flex;
    align-items: center;
    gap: 15px;
}

.stop-btn {
    background: none;
    border: none;
    color: #e74c3c;
    font-size: 1.2rem;
    cursor: pointer;
    transition: color 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.stop-btn:hover {
    color: #c0392b;
    transform: scale(1.1);
}

.play-btn {
    background: none;
    border: none;
    color: #2ecc71;
    font-size: 1.2rem;
    cursor: pointer;
    transition: color 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.play-btn:hover {
    color: #27ae60;
    transform: scale(1.1);
}

.volume-control {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--gold-accent);
}

.volume-control input[type=range] {
    -webkit-appearance: none;
    width: 80px;
    background: transparent;
}

.volume-control input[type=range]::-webkit-slider-runnable-track {
    width: 100%;
    height: 4px;
    cursor: pointer;
    background: var(--border-glass);
    border-radius: 2px;
}

.volume-control input[type=range]::-webkit-slider-thumb {
    height: 12px;
    width: 12px;
    border-radius: 50%;
    background: var(--gold-accent);
    cursor: pointer;
    -webkit-appearance: none;
    margin-top: -4px;
}

/* 言語切替 */
.lang-select-row {
    padding: 10px 20px;
    background: #000;
    border-top: 1px solid rgba(212, 175, 55, 0.15);
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.85rem;
    letter-spacing: 1px;
    color: var(--gold-light);
}

.lang-select-row label {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--gold-accent);
    white-space: nowrap;
}

.lang-select-row select {
    flex: 1;
    min-width: 0;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-main);
    border: 1px solid var(--border-glass);
    border-radius: 5px;
    padding: 6px 10px;
    font-family: 'Shippori Mincho', serif;
    font-size: 0.85rem;
    cursor: pointer;
    outline: none;
}

.lang-select-row select:focus {
    border-color: var(--gold-accent);
    box-shadow: 0 0 8px rgba(212, 175, 55, 0.25);
}

.lang-select-row select option {
    background: #14071e;
    color: var(--text-main);
}

.hidden {
    display: none !important;
}

.recording-indicator {
    position: absolute;
    top: -30px;
    left: 20px;
    font-size: 0.8rem;
    color: var(--bg-dark);
    background: var(--gold-accent);
    padding: 4px 10px;
    border-radius: 5px;
    display: flex;
    align-items: center;
    gap: 8px;
    letter-spacing: 1px;
}

.pulse {
    display: inline-block;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--bg-dark);
    animation: blinkFast 1s infinite;
}

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

@media (max-width: 480px) {
    .app-container {
        height: 100vh;
        padding: 0;
    }
    .chat-premium-box {
        border-radius: 0;
        border: none;
    }
    .message {
        max-width: 95%;
    }
}

/* Language Toggle Button */
.lang-toggle-btn {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    color: var(--text-sub);
    padding: 8px 16px;
    border-radius: 30px;
    font-family: 'Shippori Mincho', serif;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    z-index: 1000;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
    transition: all 0.3s ease;
}
.lang-toggle-btn:hover {
    border-color: var(--gold-accent);
    box-shadow: 0 4px 20px rgba(212,175,55,0.2);
}
.lang-label {
    opacity: 0.5;
    transition: all 0.3s ease;
}
.lang-label.active {
    color: var(--gold-light);
    opacity: 1;
    text-shadow: 0 0 8px rgba(212,175,55,0.4);
}
@media (max-width: 600px) {
    .lang-toggle-btn {
        top: 10px;
        right: 10px;
        font-size: 0.8rem;
        padding: 6px 12px;
    }
}



/* 免責事項 (Disclaimer) */
.disclaimer {
    text-align: center;
    padding: 10px;
    font-size: 0.75rem;
    color: var(--text-sub);
    opacity: 0.8;
    line-height: 1.4;
    margin-top: auto;
}

/* Back to Top Button */
.back-to-top-container {
    text-align: center;
    padding: 10px 10px 30px;
    margin-top: 10px;
}

.back-to-top-btn {
    display: inline-block;
    padding: 12px 30px;
    background: linear-gradient(135deg, var(--gold-accent), var(--gold-light));
    color: var(--bg-dark);
    text-decoration: none;
    font-weight: 800;
    border-radius: 30px;
    font-size: 1rem;
    box-shadow: 0 4px 15px var(--border-glass);
    transition: all 0.3s ease;
    font-family: 'Shippori Mincho', serif;
}

.back-to-top-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(230, 185, 64, 0.5);
    color: var(--bg-dark);
}