body {
    margin: 0;
    background: #f8fafc;
    color: #111827;
    font-family: Arial, Helvetica, sans-serif;
}

.pi-container {
    width: 100%;
    max-width: 1180px;
    margin: 0 auto;
    padding-left: 24px;
    padding-right: 24px;
    box-sizing: border-box;
}
.pi-page-card {
    border: 1px solid #e5e7eb;
    border-radius: 18px;
    background: white;
    box-shadow: 0 1px 2px rgba(0,0,0,.04), 0 8px 24px rgba(0,0,0,.04);
    padding: 24px;
}
.pi-header {
    background: white;
    border-bottom: 1px solid #e5e7eb;
}

.pi-header-inner {
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.pi-nav-left,
.pi-nav-right {
    display: flex;
    align-items: center;
    gap: 18px;
}

    .pi-nav-left a,
    .pi-nav-right a {
        text-decoration: none;
        color: #111827;
        font-weight: 600;
        font-size: 15px;
    }

        .pi-nav-left a:hover,
        .pi-nav-right a:hover {
            color: #2563eb;
        }

    .pi-nav-right form {
        margin: 0;
    }

.pi-main {
    padding-top: 28px;
    padding-bottom: 48px;
}

@media (max-width: 768px) {

    .pi-header-inner {
        height: auto;
        padding-top: 16px;
        padding-bottom: 16px;
        flex-direction: column;
        align-items: flex-start;
        gap: 14px;
    }

    .pi-nav-left,
    .pi-nav-right {
        flex-wrap: wrap;
    }
}
:root {
    --pi-bg: #f6f8fb;
    --pi-card: #ffffff;
    --pi-text: #101828;
    --pi-muted: #667085;
    --pi-border: #e5e7eb;
    --pi-primary: #2563eb;
    --pi-primary-dark: #1d4ed8;
    --pi-dark: #111827;
    --pi-shadow: 0 24px 70px rgba(16, 24, 40, 0.08);
    --pi-radius-xl: 28px;
    --pi-radius-lg: 18px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: var(--pi-text);
    background: radial-gradient(circle at top left, rgba(37, 99, 235, 0.12), transparent 32%), radial-gradient(circle at top right, rgba(14, 165, 233, 0.10), transparent 30%), var(--pi-bg);
}

a {
    color: inherit;
}

.pi-app-shell {
    min-height: 100vh;
}

.pi-container {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
}

.pi-topbar {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.82);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(229, 231, 235, 0.85);
}

.pi-topbar-inner {
    min-height: 76px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.pi-brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    flex-shrink: 0;
}

.pi-brand-mark {
    width: 42px;
    height: 42px;
    border-radius: 14px;
    background: linear-gradient(135deg, #2563eb, #0ea5e9);
    color: white;
    display: grid;
    place-items: center;
    font-weight: 900;
    box-shadow: 0 14px 30px rgba(37, 99, 235, 0.28);
}

.pi-brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}

    .pi-brand-text strong {
        font-size: 15px;
        letter-spacing: -0.02em;
    }

    .pi-brand-text small {
        margin-top: 3px;
        color: var(--pi-muted);
        font-size: 12px;
        font-weight: 600;
    }

.pi-main-nav {
    display: flex;
    align-items: center;
    gap: 6px;
    background: #f3f4f6;
    padding: 6px;
    border-radius: 999px;
    border: 1px solid var(--pi-border);
}

    .pi-main-nav a {
        text-decoration: none;
        color: var(--pi-muted);
        font-size: 14px;
        font-weight: 700;
        padding: 10px 14px;
        border-radius: 999px;
        transition: 0.18s ease;
    }

        .pi-main-nav a:hover {
            color: var(--pi-text);
            background: white;
            box-shadow: 0 8px 20px rgba(16, 24, 40, 0.08);
        }

.pi-account-nav {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.pi-account-link {
    color: var(--pi-muted);
    text-decoration: none;
    font-size: 14px;
    font-weight: 700;
}

    .pi-account-link:hover {
        color: var(--pi-primary);
    }

.pi-logout-form {
    margin: 0;
}

.pi-btn {
    border: 0;
    border-radius: 999px;
    padding: 11px 16px;
    font-size: 14px;
    font-weight: 800;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: 0.18s ease;
    white-space: nowrap;
}

.pi-btn-primary {
    background: var(--pi-primary);
    color: white;
    box-shadow: 0 14px 28px rgba(37, 99, 235, 0.25);
}

    .pi-btn-primary:hover {
        background: var(--pi-primary-dark);
        transform: translateY(-1px);
    }

.pi-btn-dark {
    background: var(--pi-dark);
    color: white;
}

    .pi-btn-dark:hover {
        background: #000;
        transform: translateY(-1px);
    }

.pi-main {
    padding: 34px 0 56px;
}

.pi-content-card {
    background: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(16px);
    border: 1px solid rgba(229, 231, 235, 0.9);
    border-radius: var(--pi-radius-xl);
    box-shadow: var(--pi-shadow);
    padding: clamp(20px, 4vw, 36px);
    min-height: calc(100vh - 150px);
}

@media (max-width: 900px) {
    .pi-topbar-inner {
        flex-wrap: wrap;
        padding: 14px 0;
    }

    .pi-main-nav {
        order: 3;
        width: 100%;
        overflow-x: auto;
        justify-content: flex-start;
    }

        .pi-main-nav a {
            white-space: nowrap;
        }
}

@media (max-width: 640px) {
    .pi-container {
        width: min(100% - 20px, 1180px);
    }

    .pi-brand-text small {
        display: none;
    }

    .pi-account-nav {
        gap: 8px;
    }

    body.pi-public .pi-account-link {
        display: none;
    }

    .pi-main {
        padding-top: 18px;
    }

    .pi-content-card {
        border-radius: 22px;
        padding: 18px;
    }
}
.pi-footer {
    margin-top: 4rem;
    border-top: 1px solid #e5e7eb;
    background: #fff;
    padding: 1rem 0;
}

.pi-footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.pi-footer-left {
    color: #6b7280;
    font-size: 0.9rem;
}

.pi-footer-navigation {
    display: flex;
    align-items: flex-end;
    gap: 2.5rem;
}

.pi-footer-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.pi-footer-heading {
    color: #111827;
    font-size: 0.9rem;
    font-weight: 700;
}

.pi-footer-group-links {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
}

.pi-footer-group-links a,
.pi-footer-links a {
    color: #2563eb;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
}

.pi-footer-group-links a:hover,
.pi-footer-links a:hover {
    text-decoration: underline;
}

.pi-footer-links {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.pi-footer-divider {
    color: #9ca3af;
}
.pi-topbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid #e5e7eb;
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
}

.pi-topbar-inner {
    min-height: 76px;
    display: flex;
    align-items: center;
    gap: 28px;
}

.pi-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: #0f172a;
    white-space: nowrap;
}

.pi-brand-mark {
    width: 44px;
    height: 44px;
    border-radius: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #2563eb, #7c3aed);
    color: #fff;
    font-weight: 800;
    letter-spacing: .5px;
    box-shadow: 0 10px 22px rgba(37, 99, 235, .28);
}

.pi-brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}

    .pi-brand-text strong {
        font-size: 1rem;
        font-weight: 800;
    }

    .pi-brand-text small {
        margin-top: 3px;
        font-size: .72rem;
        color: #64748b;
        font-weight: 600;
    }

.pi-main-nav {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 6px;
}

    .pi-main-nav a {
        position: relative;
        padding: 10px 14px;
        border-radius: 999px;
        color: #475569;
        font-size: .92rem;
        font-weight: 700;
        text-decoration: none;
        transition: all .2s ease;
    }

        .pi-main-nav a:hover {
            color: #1d4ed8;
            background: #eff6ff;
        }

        .pi-main-nav a:focus-visible,
        .pi-account-link:focus-visible,
        .pi-btn:focus-visible,
        .pi-nav-toggle:focus-visible {
            outline: 3px solid rgba(37, 99, 235, .25);
            outline-offset: 3px;
        }

.pi-account-nav {
    display: flex;
    align-items: center;
    gap: 12px;
    white-space: nowrap;
}

.pi-account-link {
    color: #334155;
    font-size: .92rem;
    font-weight: 700;
    text-decoration: none;
    padding: 9px 12px;
    border-radius: 999px;
    transition: all .2s ease;
}

    .pi-account-link:hover {
        color: #1d4ed8;
        background: #f1f5f9;
    }

.pi-logout-form {
    margin: 0;
}

.pi-btn {
    border: 0;
    border-radius: 999px;
    padding: 10px 18px;
    font-size: .9rem;
    font-weight: 800;
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all .2s ease;
}

.pi-btn-primary {
    background: linear-gradient(135deg, #2563eb, #4f46e5);
    color: #fff;
    box-shadow: 0 10px 22px rgba(37, 99, 235, .25);
}

    .pi-btn-primary:hover {
        transform: translateY(-1px);
        box-shadow: 0 14px 28px rgba(37, 99, 235, .32);
    }

.pi-btn-dark {
    background: #0f172a;
    color: #fff;
}

    .pi-btn-dark:hover {
        background: #1e293b;
    }

.pi-nav-toggle {
    display: none;
    margin-left: auto;
    width: 42px;
    height: 42px;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    background: #fff;
    color: #0f172a;
    font-size: 1.25rem;
    cursor: pointer;
}

/* Mobile */
@media (max-width: 980px) {
    .pi-topbar-inner {
        flex-wrap: wrap;
        gap: 14px;
        padding-top: 14px;
        padding-bottom: 14px;
    }

    .pi-nav-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .pi-main-nav,
    .pi-account-nav {
        display: none;
        width: 100%;
    }

    body.pi-nav-open .pi-main-nav,
    body.pi-nav-open .pi-account-nav {
        display: flex;
    }

    .pi-main-nav {
        order: 3;
        flex-direction: column;
        align-items: stretch;
        background: #f8fafc;
        border: 1px solid #e5e7eb;
        border-radius: 18px;
        padding: 10px;
    }

        .pi-main-nav a {
            border-radius: 12px;
            padding: 12px 14px;
        }

    .pi-account-nav {
        order: 4;
        justify-content: flex-end;
        padding-top: 4px;
    }
}

@media (max-width: 560px) {
    .pi-brand-text small {
        display: none;
    }

    .pi-account-nav {
        flex-direction: column;
        align-items: stretch;
    }

    .pi-account-link,
    .pi-btn {
        width: 100%;
        text-align: center;
    }
}

@media (max-width: 768px) {
    .pi-footer-container {
        flex-direction: column;
        text-align: center;
    }

    .pi-footer-navigation {
        flex-direction: column;
        align-items: center;
        gap: 1.25rem;
    }

    .pi-footer-group-links {
        align-items: center;
    }
}

/* Research Vision shell */
.pi-subscription-expired-banner {
    border-bottom: 1px solid #f0b429;
    background: #fff7d6;
    color: #713f12;
    padding: 12px 0;
    text-align: center;
}

.pi-subscription-expired-banner a {
    color: inherit;
    font-weight: 700;
    text-decoration: underline;
}

.pi-upload-form button:disabled {
    cursor: not-allowed;
    filter: grayscale(.35);
    opacity: .65;
}

.pi-topbar {
    background: rgba(255, 255, 255, .96);
    border-bottom: 1px solid #dfe5ed;
    box-shadow: 0 10px 30px rgba(15, 23, 42, .06);
}

.pi-topbar-inner {
    min-height: 74px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 22px;
}

.pi-brand {
    color: #172033;
}

.pi-brand-mark {
    width: 42px;
    height: 42px;
    border-radius: 8px;
    background: #172033;
    box-shadow: none;
    letter-spacing: 0;
}

.pi-brand-text strong {
    color: #172033;
    font-size: 1rem;
}

.pi-brand-text small {
    color: #667386;
    font-size: .74rem;
}

.pi-main-nav {
    flex: 1;
    justify-content: center;
    gap: 4px;
    padding: 4px;
    border: 1px solid #dfe5ed;
    border-radius: 8px;
    background: #f7fafc;
}

.pi-main-nav a {
    border-radius: 8px;
    color: #46566b;
    padding: 9px 12px;
}

.pi-main-nav a:hover {
    color: #172033;
    background: #ffffff;
}

.pi-account-nav {
    margin-left: auto;
}

.pi-account-link {
    border-radius: 8px;
    color: #46566b;
}

.pi-btn,
.pi-account-link,
.pi-nav-toggle {
    border-radius: 8px;
}

.pi-btn-primary {
    background: #2fb995;
    color: #08251f;
    box-shadow: none;
}

.pi-btn-primary:hover {
    background: #27a886;
    color: #061c18;
}

.pi-btn-dark {
    background: #172033;
}

.pi-public .pi-topbar-inner {
    justify-content: space-between;
}

.pi-public .pi-main-nav,
.pi-public .pi-nav-toggle {
    display: none;
}

body.pi-public .pi-account-nav {
    gap: 10px;
}

body.pi-public .pi-login-link,
body.pi-public .pi-get-started-link {
    box-sizing: border-box;
    height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 800;
    line-height: 1;
    text-decoration: none;
    transition: background-color .18s ease, border-color .18s ease, box-shadow .18s ease, color .18s ease, transform .18s ease;
}

body.pi-public .pi-login-link {
    padding: 0 16px;
    border: 1px solid #d7e0ea;
    background: #ffffff;
    color: #172033;
}

body.pi-public .pi-login-link:hover,
body.pi-public .pi-login-link:focus-visible {
    border-color: #b9c7d7;
    background: #f6f9fc;
    color: #0f172a;
    box-shadow: 0 10px 22px rgba(15, 23, 42, .08);
}

body.pi-public .pi-get-started-link {
    padding: 0 18px;
    border: 1px solid #2fb995;
    background: #2fb995;
    color: #08251f;
    box-shadow: 0 12px 26px rgba(47, 185, 149, .24);
}

body.pi-public .pi-get-started-link:hover,
body.pi-public .pi-get-started-link:focus-visible {
    border-color: #26a784;
    background: #26a784;
    color: #061c18;
    box-shadow: 0 14px 30px rgba(47, 185, 149, .3);
    transform: translateY(-1px);
}

.pi-footer {
    border-top: 1px solid #dfe5ed;
}

@media (max-width: 980px) {
    .pi-authenticated .pi-topbar-inner {
        flex-wrap: wrap;
    }

    .pi-authenticated .pi-nav-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .pi-authenticated .pi-main-nav,
    .pi-authenticated .pi-account-nav {
        display: none;
        width: 100%;
    }

    body.pi-authenticated.pi-nav-open .pi-main-nav,
    body.pi-authenticated.pi-nav-open .pi-account-nav {
        display: flex;
    }

    .pi-authenticated .pi-main-nav {
        order: 3;
        flex-direction: column;
        align-items: stretch;
    }

    .pi-authenticated .pi-account-nav {
        order: 4;
        justify-content: flex-end;
    }
}

@media (max-width: 560px) {
    .pi-topbar-inner {
        min-height: 66px;
    }

    .pi-public .pi-account-nav {
        gap: 8px;
    }

    .pi-public .pi-account-link {
        display: inline-flex;
        width: auto;
    }

    .pi-public .pi-btn {
        width: auto;
    }
}

body.pi-public .pi-account-nav {
    display: flex;
    align-items: stretch;
    height: 42px;
    line-height: 1;
}

body.pi-public .pi-account-nav .pi-login-link,
body.pi-public .pi-account-nav .pi-get-started-link {
    box-sizing: border-box;
    height: 42px;
    min-height: 42px;
    margin: 0;
    padding-top: 0;
    padding-bottom: 0;
    align-self: stretch;
    vertical-align: top;
    transform: none;
}

body.pi-public .pi-account-nav .pi-login-link:hover,
body.pi-public .pi-account-nav .pi-login-link:focus-visible,
body.pi-public .pi-account-nav .pi-get-started-link:hover,
body.pi-public .pi-account-nav .pi-get-started-link:focus-visible {
    transform: none;
}