:root {
    --bg: #000000;
    --fg: #ffffff;
    --muted: #666666;
    --muted-hi: #999999;
    --border: #1a1a1a;
    --border-hi: #333333;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --safe-bottom: env(safe-area-inset-bottom, 0px);
    --safe-top: env(safe-area-inset-top, 0px);
}

*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html,
body {
    background: var(--bg);
    color: var(--fg);
    font-family: var(--font);
    font-size: 16px;
    font-weight: 400;
    line-height: 1.5;
    height: 100dvh;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
}

body {
    display: flex;
    flex-direction: column;
}

.nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: calc(1.5rem + var(--safe-top)) 0 1rem;
    z-index: 50;
    background: linear-gradient(to bottom, rgba(0, 0, 0, 1) 0%, rgba(0, 0, 0, 0) 100%);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 clamp(1.25rem, 5vw, 2rem);
}

.logo {
    font-weight: 600;
    font-size: 1.125rem;
    letter-spacing: -0.02em;
}

#status {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--muted);
}

.wrap {
    flex: 1;
    display: flex;
    flex-direction: column;
    max-width: 800px;
    width: 100%;
    margin: 0 auto;
    padding: calc(5rem + var(--safe-top)) clamp(1.25rem, 5vw, 2rem) calc(2rem + var(--safe-bottom));
    min-height: 0;
}

.topic-input {
    width: 100%;
    background: transparent;
    border: none;
    color: var(--fg);
    font-family: var(--font);
    font-size: clamp(1.75rem, 6vw, 2.5rem);
    font-weight: 600;
    letter-spacing: -0.04em;
    line-height: 1.1;
    outline: none;
    resize: none;
    margin-bottom: 1.5rem;
    caret-color: var(--fg);
    flex-shrink: 0;
    overflow: hidden;
    transition: opacity 0.3s ease, color 0.3s ease;
}

.topic-input::placeholder {
    color: var(--border-hi);
}

body.debate-active .topic-input {
    color: var(--muted-hi);
}

.setup-section {
    display: grid;
    grid-template-rows: 1fr;
    transition: grid-template-rows 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    flex-shrink: 0;
}

.setup-inner {
    overflow: hidden;
    transition: opacity 0.4s ease, transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    transform: translateY(0);
    opacity: 1;
}

body.debate-active .setup-section {
    grid-template-rows: 0fr;
}

body.debate-active .setup-inner {
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
}

.active-section {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    flex-shrink: 0;
}

.active-inner {
    overflow: hidden;
    display: flex;
    gap: 0.75rem;
    align-items: center;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.4s ease, transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

body.debate-active .active-section {
    grid-template-rows: 1fr;
}

body.debate-active .active-inner {
    opacity: 1;
    transform: translateY(0);
    padding-bottom: 1.5rem;
    pointer-events: auto;
}

.controls-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.pill {
    background: transparent;
    border: 1px solid var(--border-hi);
    color: var(--muted-hi);
    font-family: var(--font);
    font-size: 0.875rem;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6,9 12,15 18,9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 0.5rem center;
    background-size: 1rem;
    padding-right: 2rem;
    background-color: transparent;
}

.pill:hover {
    border-color: var(--muted-hi);
    color: var(--fg);
}

.pill:focus {
    outline: none;
    border-color: var(--fg);
    color: var(--fg);
}

.pill.has-value {
    border-color: var(--fg);
    color: var(--bg);
    background: var(--fg);
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6,9 12,15 18,9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 0.5rem center;
    background-size: 1rem;
}

.pill option {
    background: var(--bg);
    color: var(--fg);
    padding: 0.5rem;
}

#customWrap {
    display: none;
    margin-bottom: 1.5rem;
}

.custom-input {
    width: 100%;
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--border-hi);
    color: var(--fg);
    font-family: var(--font);
    font-size: 1rem;
    padding: 0.75rem 0;
    outline: none;
    transition: border-color 0.2s ease;
}

.custom-input:focus {
    border-bottom-color: var(--fg);
}

.action-row {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--fg);
    color: var(--bg);
    padding: 0.75rem 1.25rem;
    border-radius: 6px;
    font-weight: 500;
    font-size: 0.875rem;
    border: 1px solid var(--fg);
    cursor: pointer;
    transition: transform 0.2s ease, opacity 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.btn:hover:not(:disabled) {
    opacity: 0.9;
}

.btn:active:not(:disabled) {
    transform: translateY(1px);
}

.btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.btn-outline {
    background: transparent;
    color: var(--fg);
    border-color: var(--border-hi);
}

.btn-outline:hover:not(:disabled) {
    border-color: var(--fg);
    background: var(--fg);
    color: var(--bg);
}

.btn.chaos {
    color: #ff4444;
    border-color: #331111;
}

.btn.chaos:hover {
    background: #ff4444;
    color: #000;
    border-color: #ff4444;
}

#sentimentWrap {
    display: none;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-shrink: 0;
}

.sent-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--muted);
    letter-spacing: 0.05em;
}

#sentimentTrack {
    flex: 1;
    height: 3px;
    background: var(--border-hi);
    position: relative;
    border-radius: 10px;
}

#sentimentFill {
    height: 100%;
    width: 50%;
    background: var(--fg);
    transition: width 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

#sentimentMid {
    position: absolute;
    top: -3px;
    left: 50%;
    transform: translateX(-50%);
    width: 3px;
    height: 9px;
    background: var(--fg);
    border-radius: 10px;
}

#chatWrap {
    flex: 1;
    overflow-y: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
    padding-bottom: 2rem;
    -webkit-mask-image: linear-gradient(to bottom, transparent 0%, black 5%, black 95%, transparent 100%);
    mask-image: linear-gradient(to bottom, transparent 0%, black 5%, black 95%, transparent 100%);
}

#chatWrap::-webkit-scrollbar {
    display: none;
}

#chat {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.round-label {
    text-align: center;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--muted);
    margin: 1rem 0 0.5rem;
    letter-spacing: 0.05em;
}

.msg {
    max-width: 85%;
    font-size: 0.9375rem;
    line-height: 1.6;
    animation: slideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.msg-a {
    align-self: flex-start;
}

.msg-b {
    align-self: flex-end;
    text-align: right;
}

.msg-judge {
    align-self: center;
    text-align: center;
    max-width: 100%;
    color: var(--muted-hi);
    font-style: italic;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    padding: 1.5rem 0;
    margin: 1rem 0;
}

.name {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--muted);
    margin-bottom: 0.375rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.typing {
    display: flex;
    gap: 4px;
    padding: 1rem 0;
}

.dot {
    width: 4px;
    height: 4px;
    background: var(--muted);
    border-radius: 50%;
    animation: blink 1.4s infinite both;
}

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

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

@keyframes blink {

    0%,
    80%,
    100% {
        opacity: 0.2;
        transform: scale(0.8);
    }

    40% {
        opacity: 1;
        transform: scale(1.2);
    }
}

#inputBar {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: var(--bg);
    border-top: 1px solid var(--border-hi);
    padding: 1rem clamp(1.25rem, 5vw, 2rem) calc(1rem + var(--safe-bottom));
    z-index: 500;
}

.input-container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    gap: 1rem;
}

.human-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--fg);
    font-family: var(--font);
    font-size: 1rem;
    outline: none;
}

.human-input::placeholder {
    color: var(--muted);
}

@media (max-width: 600px) {
    .action-row {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .active-inner {
        flex-wrap: wrap;
    }

    .active-inner .btn {
        flex: 1;
        min-width: calc(50% - 0.75rem);
    }
}