:root {
    color-scheme: dark;
    --bg: #050505;
    --panel: #11100e;
    --panel-soft: #191713;
    --gold: #d7b46a;
    --gold-bright: #f4d891;
    --gold-dark: #7c612d;
    --text: #f8f1e2;
    --muted: #b9ad96;
    --line: rgba(215, 180, 106, 0.24);
    --danger: #f0b8a5;
}

* {
    box-sizing: border-box;
}

html,
body {
    min-height: 100%;
}

body {
    margin: 0;
    background:
        radial-gradient(circle at top, rgba(215, 180, 106, 0.16), transparent 34rem),
        linear-gradient(180deg, #0a0908 0%, var(--bg) 56%, #020202 100%);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", Meiryo, sans-serif;
    line-height: 1.6;
}

button,
textarea,
a {
    font: inherit;
}

.top-nav {
    position: sticky;
    top: 0;
    z-index: 120;
    display: flex;
    justify-content: space-between;
    gap: 0.75rem;
    width: min(100%, 30rem);
    margin: 0 auto;
    padding: 0.75rem 1rem 0.35rem;
    background: linear-gradient(180deg, rgba(5, 5, 5, 0.96), rgba(5, 5, 5, 0.72));
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.top-nav__brand,
.top-nav__back {
    display: inline-flex;
    min-height: 2.25rem;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(215, 180, 106, 0.28);
    border-radius: 999px;
    padding: 0.4rem 0.85rem;
    background: rgba(17, 16, 14, 0.82);
    color: var(--gold-bright);
    font-size: 0.82rem;
    font-weight: 700;
    line-height: 1.2;
    text-decoration: none;
}

.top-nav__back {
    color: var(--text);
}

.page-shell {
    width: min(100%, 30rem);
    min-height: 100vh;
    margin: 0 auto;
    padding: 0.75rem 1rem 5rem; /* v0.8.8: 固定CTAバー分の下余白 */
}

.app-version {
    padding: 0.9rem 0 0.2rem;
    color: rgba(185, 173, 150, 0.8);
    font-size: 0.72rem;
    letter-spacing: 0;
    text-align: center;
}

.hero {
    display: grid;
    justify-items: center;
    padding: 1rem 0 0.75rem;
    text-align: center;
}

.avatar-frame {
    position: relative;
    width: min(62vw, 13.5rem);
    aspect-ratio: 1;
    display: grid;
    place-items: center;
    overflow: hidden;
    border: 1px solid rgba(244, 216, 145, 0.46);
    border-radius: 50%;
    background: linear-gradient(145deg, #1e1a12, #070706);
    box-shadow: 0 1rem 3rem rgba(0, 0, 0, 0.58), inset 0 0 2.5rem rgba(215, 180, 106, 0.15);
}

.avatar-frame::before {
    content: "";
    position: absolute;
    inset: 0.45rem;
    border: 1px solid rgba(244, 216, 145, 0.22);
    border-radius: inherit;
    pointer-events: none;
}

.avatar-frame.is-missing::after {
    content: "TWIN\A SEIKA";
    white-space: pre;
    color: var(--gold-bright);
    font-family: Georgia, "Times New Roman", serif;
    font-size: 1.5rem;
    letter-spacing: 0.08em;
    line-height: 1.2;
}

.avatar {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.eyebrow {
    margin: 1rem 0 0.25rem;
    color: var(--gold);
    font-size: 0.68rem;
    letter-spacing: 0.16em;
}

h1 {
    margin: 0;
    font-family: Georgia, "Times New Roman", serif;
    font-size: clamp(2.15rem, 14vw, 3.25rem);
    font-weight: 500;
    letter-spacing: 0;
}

.lead {
    margin: 0.35rem 0 0;
    color: var(--muted);
    font-size: 0.95rem;
}

.chat-panel {
    display: flex;
    min-height: 28rem;
    max-height: calc(100vh - 19rem);
    border: 1px solid var(--line);
    border-radius: 0.5rem;
    background: rgba(17, 16, 14, 0.94);
    box-shadow: 0 1.25rem 3rem rgba(0, 0, 0, 0.35);
    overflow: hidden;
    flex-direction: column;
}

.chat-status {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    min-height: 3rem;
    padding: 0.75rem 0.9rem;
    border-bottom: 1px solid var(--line);
    color: var(--muted);
    font-size: 0.83rem;
}

.chat-status strong {
    margin-left: auto;
    color: var(--gold-bright);
    font-variant-numeric: tabular-nums;
}

.status-dot {
    width: 0.48rem;
    height: 0.48rem;
    border-radius: 50%;
    background: #50d67a;
    box-shadow: 0 0 0.8rem rgba(80, 214, 122, 0.65);
}

.messages {
    flex: 1;
    min-height: 13rem;
    padding: 1rem 0.85rem;
    overflow-y: auto;
    scroll-behavior: smooth;
}

.message-row {
    display: flex;
    margin: 0 0 0.7rem;
}

.message-row.user {
    justify-content: flex-end;
}

.bubble {
    max-width: min(82%, 22rem);
    padding: 0.72rem 0.85rem;
    border-radius: 1rem;
    font-size: 0.92rem;
    overflow-wrap: anywhere;
    white-space: pre-line;
}

.message-row.twin .bubble {
    border-top-left-radius: 0.25rem;
    background: #242018;
    color: var(--text);
    border: 1px solid rgba(215, 180, 106, 0.18);
}

.message-row.user .bubble {
    border-top-right-radius: 0.25rem;
    background: linear-gradient(135deg, var(--gold-bright), var(--gold));
    color: #171107;
}

.typing-row .bubble {
    opacity: 0.8;
    animation: typingPulse 1.2s ease-in-out infinite;
}

.system-message {
    min-height: 1.5rem;
    padding: 0 0.9rem 0.5rem;
    color: var(--danger);
    font-size: 0.83rem;
}

.chat-form {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 0.5rem;
    padding: 0.75rem;
    border-top: 1px solid var(--line);
    background: rgba(5, 5, 5, 0.7);
}

textarea {
    width: 100%;
    max-height: 7.5rem;
    resize: none;
    border: 1px solid rgba(215, 180, 106, 0.32);
    border-radius: 1.25rem;
    padding: 0.72rem 0.9rem;
    background: #0b0a09;
    color: var(--text);
    outline: none;
}

textarea:focus {
    border-color: var(--gold);
    box-shadow: 0 0 0 0.2rem rgba(215, 180, 106, 0.14);
}

textarea:disabled {
    opacity: 0.55;
}

button,
.cta {
    min-height: 2.75rem;
    border: 0;
    border-radius: 999px;
    cursor: pointer;
    text-decoration: none;
    transition: transform 0.16s ease, opacity 0.16s ease;
}

button {
    min-width: 4.5rem;
    padding: 0 1rem;
    background: linear-gradient(135deg, var(--gold-bright), var(--gold-dark));
    color: #120e08;
    font-weight: 700;
}

button:disabled {
    cursor: not-allowed;
    opacity: 0.55;
}

button:not(:disabled):active,
.cta:active {
    transform: translateY(1px);
}

.finished-panel {
    padding: 1rem 0.9rem 1.1rem;
    border-top: 1px solid var(--line);
    background: linear-gradient(180deg, var(--panel-soft), #0a0908);
    text-align: center;
}

.finished-title {
    margin: 0;
    color: var(--gold-bright);
    font-size: 1.05rem;
    font-weight: 700;
}

.finished-copy {
    margin: 0.25rem 0 0.9rem;
    color: var(--muted);
    font-size: 0.9rem;
}

.cta-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.5rem;
}

.cta {
    display: grid;
    place-items: center;
    border: 1px solid rgba(215, 180, 106, 0.34);
    background: #100f0d;
    color: var(--text);
    font-weight: 700;
}

.cta.primary {
    border-color: transparent;
    background: linear-gradient(135deg, #06c755, #04a846);
    color: #fff;
}

/* v0.8.6: 回答直後のインライン LINE 導線 */
.line-cta-row {
    margin-top: -0.25rem;
}

.line-cta {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    max-width: 85%;
}

.line-cta-note {
    margin: 0;
    font-size: 0.82rem;
    line-height: 1.5;
    color: var(--muted, #b8b09c);
}

.line-cta-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.6rem 1rem;
    border-radius: 999px;
    background: linear-gradient(135deg, #06c755, #04a846);
    color: #fff;
    font-weight: 700;
    text-decoration: none;
    box-shadow: 0 4px 14px rgba(6, 199, 85, 0.28);
}

.line-cta-button[aria-disabled="true"] {
    opacity: 0.6;
    pointer-events: none;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

@keyframes typingPulse {
    0%,
    100% {
        opacity: 0.55;
    }

    50% {
        opacity: 1;
    }
}

/* v0.8.8: 固定CTAバー */
.fixed-cta-bar {
    position: fixed;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: min(100%, 30rem);
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 0.4rem;
    padding: 0.55rem 0.75rem calc(0.55rem + env(safe-area-inset-bottom));
    background: rgba(8, 7, 6, 0.94);
    border-top: 1px solid rgba(215, 180, 106, 0.22);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 200;
}

.fixed-cta {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.6rem 0.4rem;
    border-radius: 999px;
    font-size: 0.82rem;
    font-weight: 700;
    text-decoration: none;
    transition: opacity 0.15s, transform 0.15s;
    white-space: nowrap;
}

.fixed-cta:active {
    transform: scale(0.96);
}

.fixed-cta-line {
    background: linear-gradient(135deg, #06c755, #04a846);
    color: #fff;
    box-shadow: 0 2px 10px rgba(6, 199, 85, 0.25);
}

.fixed-cta-price {
    border: 1px solid rgba(215, 180, 106, 0.38);
    background: rgba(17, 16, 14, 0.85);
    color: var(--gold);
}

.fixed-cta-instagram {
    border: 1px solid rgba(215, 180, 106, 0.18);
    background: rgba(17, 16, 14, 0.85);
    color: var(--muted);
}

/* trial終了後: LINE予約ボタン強調 */
.fixed-cta-bar.is-finished .fixed-cta-line {
    box-shadow:
        0 0 0 1px rgba(6, 199, 85, 0.45),
        0 0 18px rgba(6, 199, 85, 0.45),
        0 2px 10px rgba(6, 199, 85, 0.3);
}

@media (min-width: 42rem) {
    .page-shell {
        width: min(100%, 36rem);
        padding-top: 2rem;
    }

    .top-nav {
        width: min(100%, 36rem);
        padding-top: 1rem;
    }

    .chat-panel {
        max-height: calc(100vh - 21rem);
    }

    .cta-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .fixed-cta-bar {
        width: min(100%, 36rem);
    }
}