:root {
    --bg: #08111f;
    --bg-elevated: rgba(12, 20, 34, 0.88);
    --bg-soft: rgba(18, 27, 44, 0.9);
    --surface: rgba(255, 255, 255, 0.06);
    --surface-strong: rgba(255, 255, 255, 0.11);
    --line: rgba(148, 163, 184, 0.18);
    --text: #e8eef9;
    --muted: #a9b6cb;
    --primary: #7dd3fc;
    --primary-strong: #38bdf8;
    --accent: #a78bfa;
    --success: #34d399;
    --warning: #fbbf24;
    --danger: #fb7185;
    --shadow: 0 24px 80px rgba(2, 6, 23, 0.45);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at top left, rgba(56, 189, 248, 0.16), transparent 34%),
        radial-gradient(circle at top right, rgba(167, 139, 250, 0.16), transparent 30%),
        linear-gradient(180deg, #040814 0%, #08111f 34%, #0b1324 100%);
    min-height: 100vh;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button, input, textarea, select { font: inherit; }

.app-authenticated { background:
    radial-gradient(circle at top, rgba(56, 189, 248, 0.12), transparent 28%),
    linear-gradient(180deg, #05101d 0%, #09111f 100%); }

.app-shell, .page-shell {
    width: min(1240px, calc(100% - 32px));
    margin: 0 auto;
}

.topbar, .app-header {
    position: sticky;
    top: 0;
    z-index: 40;
    backdrop-filter: blur(16px);
    background: rgba(4, 10, 22, 0.72);
    border-bottom: 1px solid var(--line);
}

.topbar-inner, .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 18px 0;
}

.brand, .sidebar-brand, .landing-brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    letter-spacing: .02em;
}

.brand span small, .landing-brand small { display:block; color: var(--muted); font-weight: 500; }
.brand-mark, .landing-logo {
    width: 42px; height: 42px; border-radius: 14px;
    display:grid; place-items:center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    color: #04111f; font-weight: 800;
    box-shadow: 0 16px 32px rgba(56, 189, 248, 0.22);
}

.sidebar, .nav-panel {
    display:flex; flex-wrap:wrap; gap:10px; align-items:center;
}

.sidebar a, .nav-panel a, .button, .link-action, .logout-link {
    border: 1px solid var(--line);
    background: rgba(255,255,255,0.04);
    color: var(--text);
    border-radius: 14px;
    padding: 10px 14px;
    transition: .2s ease;
}
.sidebar a:hover, .nav-panel a:hover, .button:hover, .link-action:hover, .logout-link:hover { transform: translateY(-1px); border-color: rgba(125, 211, 252, 0.42); background: rgba(125, 211, 252, 0.08); }

.button.primary, .landing-btn.primary { background: linear-gradient(135deg, var(--primary-strong), var(--accent)); color: #07111d; border-color: transparent; font-weight: 700; }
.button.ghost, .landing-btn.ghost { background: transparent; }
.button.compact { padding: 8px 12px; border-radius: 12px; }

.content, .app-main, .page-content, .main-content {
    width: min(1240px, calc(100% - 32px));
    margin: 24px auto 48px;
}

.card, .panel, .section, .landing-card, .feature-card, .control-grid article, .audience-grid article, .document-card, .trial-form, .dashboard-mockup {
    background: var(--bg-elevated);
    border: 1px solid var(--line);
    border-radius: 24px;
    box-shadow: var(--shadow);
}

.card, .panel, .section { padding: 22px; }

h1, h2, h3, h4 { margin: 0 0 12px; line-height: 1.08; letter-spacing: -.03em; }
p { color: var(--muted); line-height: 1.65; }

.table-responsive { overflow-x: auto; border-radius: 18px; border: 1px solid var(--line); }
table { width: 100%; border-collapse: collapse; min-width: 760px; }
th, td { padding: 14px 16px; border-bottom: 1px solid rgba(148, 163, 184, 0.12); text-align: left; }
th { color: #dbe5f4; background: rgba(255,255,255,.03); font-size: .92rem; }
tbody tr:hover { background: rgba(125, 211, 252, 0.05); }

.form-grid, .trial-form {
    display:grid;
    gap: 14px;
}
.trial-form { padding: 22px; grid-template-columns: repeat(2, minmax(0, 1fr)); }
.trial-form .wide { grid-column: 1 / -1; }
label { display:grid; gap: 8px; color: #dbe5f4; font-weight: 600; }
input, textarea, select {
    width: 100%;
    border-radius: 14px;
    border: 1px solid rgba(148, 163, 184, 0.2);
    background: rgba(3, 8, 18, 0.65);
    color: var(--text);
    padding: 12px 14px;
    outline: none;
}
input:focus, textarea:focus, select:focus { border-color: rgba(125, 211, 252, 0.7); box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.14); }
textarea { min-height: 120px; resize: vertical; }

.flash { margin: 0 0 18px; padding: 14px 16px; border-radius: 16px; border: 1px solid var(--line); }
.flash.success { background: rgba(52, 211, 153, 0.12); }
.flash.error { background: rgba(251, 113, 133, 0.12); }

.mobile-toggle { display:none; }
.mobile-topbar { display:none; }
.sidebar.is-open { display:flex; }

@media (max-width: 900px) {
    .topbar-inner, .header-inner, .app-shell, .page-shell, .content, .app-main, .page-content, .main-content { width: min(100% - 20px, 1240px); }
    .mobile-topbar {
        display:flex;
        align-items:center;
        justify-content:space-between;
        gap: 12px;
        width: min(1240px, calc(100% - 20px));
        margin: 0 auto;
        padding: 14px 0;
    }
    .sidebar, .nav-panel {
        display:none;
        position: fixed;
        inset: 74px 10px auto;
        z-index: 60;
        padding: 16px;
        max-height: calc(100vh - 90px);
        overflow:auto;
        background: rgba(5, 10, 18, 0.96);
        border-radius: 24px;
        border: 1px solid var(--line);
        box-shadow: var(--shadow);
    }
    .sidebar.is-open { display:flex; }
    .mobile-toggle { display:inline-flex; }
    .trial-form { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
    .card, .panel, .section, .trial-form { padding: 16px; border-radius: 20px; }
    table { min-width: 640px; }
}