:root {
    --ap-primary: #5b21ff;
    --ap-primary-hover: #4818d6;
    --ap-sidebar: #11131c;
    --ap-sidebar-soft: #171a26;
    --ap-surface: #ffffff;
    --ap-page: #f4f5f8;
    --ap-border: #dfe2e9;
    --ap-text: #1d1f27;
    --ap-muted: #747986;
}

/* Sidebar: restrained, high-contrast navigation */
.tt-sidebar {
    background: var(--ap-sidebar);
    box-shadow: 4px 0 20px rgba(13, 15, 24, 0.18);
}

.tt-sidebar-logo {
    min-height: 64px;
    padding-top: 14px;
    padding-bottom: 14px;
    border-bottom-color: rgba(255, 255, 255, 0.08);
}

.tt-logo-arbitrage {
    color: #fff;
    border-color: transparent;
    background: var(--ap-primary);
    box-shadow: none;
}

.tt-logo-text {
    font-size: 0.88rem;
    letter-spacing: -0.01em;
}

.tt-brand-sub {
    color: rgba(255, 255, 255, 0.58);
}

.tt-sidebar-search {
    border-color: rgba(255, 255, 255, 0.09);
    background: rgba(255, 255, 255, 0.045);
}

.tt-sidebar-search-input {
    color: #fff;
}

.tt-sidebar-search-input::placeholder {
    color: rgba(255, 255, 255, 0.42);
}

.tt-sidebar-search:focus-within {
    border-color: rgba(167, 139, 250, 0.62);
    background: rgba(91, 33, 255, 0.1);
    box-shadow: 0 0 0 3px rgba(91, 33, 255, 0.13);
}

.tt-nav-section-title {
    color: transparent;
    letter-spacing: 0.1em;
}

.tt-sidebar:hover .tt-nav-section-title,
.tt-sidebar.pinned .tt-nav-section-title {
    color: rgba(255, 255, 255, 0.5);
}

.tt-nav-item {
    min-height: 42px;
    margin: 2px 6px;
    padding: 7px 8px;
    border-left: 0;
    border-radius: 10px;
    color: rgba(255, 255, 255, 0.68);
    font-weight: 500;
}

.tt-nav-item:hover {
    border-left-color: transparent;
    background: rgba(255, 255, 255, 0.065);
    color: #fff;
}

.tt-nav-item.active {
    border-left-color: transparent;
    background: var(--ap-primary);
    color: #fff;
    box-shadow: none;
}

.tt-nav-icon {
    color: rgba(255, 255, 255, 0.58);
}

.tt-nav-item:hover .tt-nav-icon,
.tt-nav-item.active .tt-nav-icon {
    color: #fff;
}

.tt-nav-icon .tt-menu-svg {
    width: 19px;
    height: 19px;
    stroke-width: 1.85;
}

.tt-nav-label {
    margin-left: 11px;
}

.tt-sidebar-bottom {
    border-top-color: rgba(255, 255, 255, 0.08);
    background: var(--ap-sidebar-soft);
}

.tt-user-avatar {
    background: var(--ap-primary);
}

.tt-user-role {
    color: #bba9ff;
}

/* Login: the same dark base and purple accent as the platform navigation */
.auth-page {
    isolation: isolate;
    padding: 24px;
    background: linear-gradient(160deg, #0f1118 0%, #141824 62%, #120a2b 100%);
}

.auth-page::before {
    content: '';
    position: absolute;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background:
        radial-gradient(circle at 18% 18%, rgba(91, 33, 255, 0.2), transparent 22rem),
        radial-gradient(circle at 84% 82%, rgba(167, 139, 250, 0.1), transparent 24rem);
}

.login-card {
    width: min(420px, 100%);
    padding: 38px;
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-top: 3px solid var(--ap-primary);
    border-radius: 16px;
    background: var(--ap-surface);
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.32);
}

.platform-brand {
    margin-bottom: 32px;
}

.brand-mark {
    width: 44px;
    height: 44px;
    border-radius: 11px;
    background: var(--ap-primary);
    box-shadow: 0 8px 18px rgba(91, 33, 255, 0.24);
}

.brand-mark svg {
    width: 27px;
    height: 27px;
}

.brand-copy,
.brand-copy strong {
    color: var(--ap-text);
}

.brand-copy span {
    color: var(--ap-muted);
}

.card-heading {
    margin-bottom: 26px;
}

.card-heading h1 {
    color: var(--ap-text);
    font-size: 25px;
    font-weight: 700;
    letter-spacing: -0.025em;
}

.login-form {
    gap: 18px;
}

.form-field label {
    margin-bottom: 7px;
    color: #3e424d;
    font-size: 12px;
    font-weight: 650;
}

.input-wrap input {
    height: 50px;
    border-color: #d9dce4;
    border-radius: 10px;
    background: #f8f9fb;
    color: var(--ap-text);
}

.input-wrap input::placeholder {
    color: #9ca1ad;
}

.input-wrap input:hover {
    border-color: #bcc1cc;
}

.input-wrap input:focus {
    border-color: var(--ap-primary);
    background: #fff;
    box-shadow: 0 0 0 3px rgba(91, 33, 255, 0.11);
}

.input-icon,
.password-toggle {
    color: #858b98;
}

.password-toggle:hover,
.password-toggle:focus-visible {
    background: #efedf8;
    color: var(--ap-primary);
}

.submit-button {
    min-height: 50px;
    border-color: var(--ap-primary);
    border-radius: 10px;
    background: var(--ap-primary);
    box-shadow: none;
}

.submit-button:hover,
.submit-button:focus-visible {
    border-color: var(--ap-primary-hover);
    background: var(--ap-primary-hover);
    box-shadow: 0 8px 20px rgba(91, 33, 255, 0.18);
}

.session-icon {
    background: #efebff;
    color: var(--ap-primary);
}

.flash-error {
    border-color: #f1c3c7;
    background: #fff1f2;
    color: #9f2430;
}

.flash-success {
    border-color: #b9ddc6;
    background: #eefaf2;
    color: #21733d;
}

@media (max-width: 520px) {
    .auth-page {
        padding: 16px;
    }

    .login-card {
        padding: 30px 22px;
        border-radius: 14px;
    }

    .platform-brand {
        margin-bottom: 28px;
    }

    .card-heading h1 {
        font-size: 23px;
    }
}