:root {
    color-scheme: dark;
    --page-bg: #020818;
    --panel-bg: rgba(4, 10, 28, 0.48);
    --panel-border: rgba(164, 203, 245, 0.16);
    --field-bg: rgba(255, 255, 255, 0.08);
    --field-border: rgba(180, 225, 255, 0.18);
    --field-text: #edf4ff;
    --button-bg: rgba(235, 244, 255, 0.12);
    --button-text: #edf4ff;
    --button-border: rgba(235, 244, 255, 0.2);
    --error-bg: rgba(115, 18, 34, 0.82);
    --error-border: rgba(255, 153, 153, 0.45);
    --error-text: #fff4f4;
    --shadow: 0 12px 30px rgba(0, 0, 0, 0.28);
    --radius: 18px;
    --font-display: "Avenir Next", "Helvetica Neue", sans-serif;
    --font-body: "Avenir Next", "Helvetica Neue", sans-serif;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    min-height: 100%;
    font-family: var(--font-body);
}

body {
    background: var(--page-bg);
}

img {
    display: block;
    max-width: 100%;
}

.landing-page {
    height: 100vh;
    height: 100svh;
    height: 100dvh;
    overflow: hidden;
    padding: 30px 0;
    position: relative;
}

.landing-page::before {
    background:
        linear-gradient(90deg, rgba(2, 8, 24, 1) 0%, rgba(2, 8, 24, 0.94) 12%, rgba(2, 8, 24, 0.58) 26%, rgba(2, 8, 24, 0.18) 40%, rgba(2, 8, 24, 0) 52%),
        linear-gradient(270deg, rgba(2, 8, 24, 1) 0%, rgba(2, 8, 24, 0.94) 12%, rgba(2, 8, 24, 0.58) 26%, rgba(2, 8, 24, 0.18) 40%, rgba(2, 8, 24, 0) 52%),
        linear-gradient(180deg, rgba(2, 8, 24, 0.54) 0%, rgba(2, 8, 24, 0.12) 10%, rgba(2, 8, 24, 0) 18%),
        linear-gradient(0deg, rgba(2, 8, 24, 0.72) 0%, rgba(2, 8, 24, 0.16) 12%, rgba(2, 8, 24, 0) 22%),
        radial-gradient(circle at 50% 18%, rgba(130, 204, 255, 0.3), transparent 38%);
    content: "";
    inset: 0;
    pointer-events: none;
    position: absolute;
    z-index: 1;
}

.hero-banner {
    background: #020818;
    height: calc(100vh - 60px);
    height: calc(100svh - 60px);
    height: calc(100dvh - 60px);
    object-fit: contain;
    object-position: center center;
    width: 100%;
}

.login-shell {
    bottom: 0;
    left: 0;
    padding: 20px 16px 18px;
    position: fixed;
    right: 0;
    z-index: 2;
}

.login-alert,
.login-row {
    margin: 0 auto;
    width: min(100%, 428px);
}

.login-alert {
    backdrop-filter: blur(16px);
    background: var(--error-bg);
    border: 1px solid var(--error-border);
    border-radius: 14px;
    color: var(--error-text);
    margin-bottom: 10px;
    padding: 10px 14px;
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    font-size: 0.7rem;
}

.login-row {
    align-items: center;
    backdrop-filter: blur(18px);
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    display: grid;
    gap: 8px;
    grid-template-columns: 96px minmax(0, 1fr) 64px;
    padding: 10px;
}

.login-row input,
.login-row button {
    appearance: none;
    border-radius: 12px;
    font-family: var(--font-display);
    font-size: 0.8rem;
    height: 46px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.login-row input {
    background: var(--field-bg);
    border: 1px solid var(--field-border);
    color: var(--field-text);
    min-width: 0;
    outline: none;
    padding: 0 14px;
}

.login-row input::placeholder {
    color: rgba(237, 244, 255, 0.6);
}

.login-row input:focus {
    border-color: rgba(237, 244, 255, 0.38);
    box-shadow: 0 0 0 1px rgba(237, 244, 255, 0.08);
}

.login-row button {
    background: var(--button-bg);
    border: 1px solid var(--button-border);
    color: var(--button-text);
    cursor: pointer;
    font-weight: 600;
}

.login-row button:hover {
    background: rgba(235, 244, 255, 0.18);
    transform: translateY(-1px);
}

.dashboard-page {
    background: #ffffff;
    color: #5b6470;
    min-height: 100vh;
    min-height: 100svh;
    min-height: 100dvh;
    overflow: hidden;
}

.brainbox-shell {
    background: #ffffff;
    min-height: 100vh;
    min-height: 100svh;
    min-height: 100dvh;
    position: relative;
}

.brainbox-canvas {
    background:
        radial-gradient(circle at 50% 100%, rgba(18, 28, 48, 0.03), transparent 32%),
        linear-gradient(180deg, rgba(255, 255, 255, 1) 0%, rgba(254, 254, 254, 1) 100%);
    inset: 0;
    position: absolute;
}

.brainbox-overlay {
    display: flex;
    flex-direction: column;
    inset: 0;
    justify-content: flex-end;
    padding: 24px 18px 20px;
    pointer-events: none;
    position: absolute;
    z-index: 2;
}

.brainbox-history-shell {
    margin: 0 auto;
    max-height: 0;
    opacity: 0;
    overflow: auto;
    padding: 4px;
    pointer-events: none;
    transform: translateY(14px);
    transition:
        opacity 180ms ease,
        transform 180ms ease,
        visibility 0s linear 180ms,
        max-height 180ms ease;
    visibility: hidden;
    width: min(100%, 420px);
}

.brainbox-history-shell.is-visible {
    margin-bottom: 14px;
    max-height: min(46vh, 520px);
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
    transition:
        opacity 180ms ease,
        transform 180ms ease,
        visibility 0s linear 0s,
        max-height 180ms ease;
    visibility: visible;
}

.brainbox-history {
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-height: min-content;
}

.brainbox-history-entry {
    display: flex;
    flex-direction: column;
    gap: 4px;
    max-width: 100%;
}

.brainbox-history-entry.is-user {
    align-self: flex-end;
    text-align: right;
}

.brainbox-history-entry.is-codex {
    align-self: flex-start;
}

.brainbox-history-role {
    color: rgba(106, 114, 126, 0.66);
    font-size: 0.62rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

.brainbox-history-text {
    background: rgba(247, 248, 250, 0.82);
    border: 1px solid rgba(148, 156, 170, 0.16);
    border-radius: 18px;
    color: #626b78;
    font-size: 0.94rem;
    line-height: 1.55;
    padding: 12px 14px;
    white-space: pre-wrap;
    word-break: break-word;
}

.brainbox-history-entry.is-user .brainbox-history-text {
    background: rgba(239, 241, 244, 0.86);
}

.brainbox-composer-wrap {
    margin: 0 auto;
    pointer-events: auto;
    width: min(100%, 420px);
}

.brainbox-composer {
    align-items: end;
    background: rgba(247, 247, 248, 0.94);
    border: 1px solid #dbdfe5;
    border-radius: 24px;
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.035);
    display: grid;
    gap: 10px;
    grid-template-columns: minmax(0, 1fr) auto auto;
    padding: 10px;
}

.brainbox-composer-field {
    min-width: 0;
}

.brainbox-composer-send,
.brainbox-menu-toggle {
    appearance: none;
    align-items: center;
    background: rgba(255, 255, 255, 0.84);
    border: 1px solid #dee2e8;
    border-radius: 16px;
    color: #9aa1aa;
    cursor: pointer;
    display: inline-flex;
    font-family: var(--font-display);
    font-size: 0.67rem;
    font-weight: 600;
    height: 40px;
    justify-content: center;
    letter-spacing: 0.16em;
    line-height: 1;
    padding: 0 12px;
    text-transform: uppercase;
    transition:
        border-color 140ms ease,
        color 140ms ease,
        background-color 140ms ease;
}

.brainbox-composer-send:hover,
.brainbox-composer-send:focus-visible,
.brainbox-menu-toggle:hover,
.brainbox-menu-toggle:focus-visible,
.brainbox-menu.is-open .brainbox-menu-toggle {
    background: rgba(255, 255, 255, 0.98);
    border-color: #c7ced8;
    color: #6a7280;
    outline: none;
}

.brainbox-composer-send {
    min-width: 64px;
}

.brainbox-menu {
    position: relative;
}

.brainbox-menu-toggle {
    min-width: 44px;
    padding-left: 0;
    padding-right: 0;
}

.brainbox-menu-toggle-icon {
    display: block;
    fill: currentColor;
    height: 16px;
    width: 16px;
}

.brainbox-menu-dropdown {
    background: rgba(251, 251, 252, 0.98);
    border: 1px solid #dde1e7;
    border-radius: 18px;
    bottom: calc(100% + 10px);
    box-shadow: 0 16px 36px rgba(15, 23, 42, 0.08);
    min-width: 210px;
    padding: 6px;
    position: absolute;
    right: 0;
}

.brainbox-menu-form {
    margin: 0;
}

.brainbox-menu-item {
    appearance: none;
    background: transparent;
    border: 0;
    border-radius: 12px;
    color: #5c6571;
    cursor: pointer;
    display: block;
    font-family: var(--font-body);
    font-size: 0.8rem;
    line-height: 1.4;
    padding: 10px 12px;
    text-align: left;
    width: 100%;
}

.brainbox-menu-item:hover,
.brainbox-menu-item:focus-visible {
    background: rgba(236, 239, 243, 0.88);
    color: #3f4854;
    outline: none;
}

.brainbox-composer textarea {
    appearance: none;
    background: transparent;
    border: 0;
    color: #4b5360;
    display: block;
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.5;
    margin: 0;
    max-height: 220px;
    min-height: 42px;
    outline: none;
    overflow: auto;
    padding: 9px 2px 5px;
    resize: none;
    width: 100%;
}

.brainbox-composer textarea::placeholder {
    color: #9ea5af;
}

.sr-only {
    clip: rect(0, 0, 0, 0);
    clip-path: inset(50%);
    height: 1px;
    overflow: hidden;
    position: absolute;
    white-space: nowrap;
    width: 1px;
}

@media (max-width: 600px) {
    .login-shell {
        padding: 14px 10px 12px;
    }

    .login-row {
        gap: 8px;
        grid-template-columns: 74px minmax(0, 1fr) 52px;
        padding: 10px;
        width: min(100%, 294px);
    }

    .login-row input,
    .login-row button {
        font-size: 0.68rem;
        height: 42px;
        letter-spacing: 0.08em;
        padding-left: 10px;
        padding-right: 10px;
    }

    .brainbox-overlay {
        padding: 14px 10px 12px;
    }

    .brainbox-composer {
        border-radius: 20px;
        gap: 8px;
        grid-template-columns: minmax(0, 1fr) 62px 40px;
        padding: 8px;
    }

    .brainbox-composer-send,
    .brainbox-menu-toggle {
        border-radius: 14px;
        font-size: 0.62rem;
        height: 38px;
        letter-spacing: 0.12em;
        padding-left: 10px;
        padding-right: 10px;
    }

    .brainbox-menu-toggle {
        min-width: 40px;
        padding-left: 0;
        padding-right: 0;
    }

    .brainbox-history-shell {
        margin-bottom: 0;
    }

    .brainbox-history-text {
        border-radius: 16px;
        font-size: 0.9rem;
        padding: 11px 12px;
    }

    .brainbox-history-shell.is-visible {
        margin-bottom: 10px;
    }

    .brainbox-menu-dropdown {
        min-width: 180px;
        right: -2px;
    }

    .brainbox-composer textarea {
        font-size: 0.95rem;
        min-height: 38px;
        padding-top: 8px;
    }
}