:root {
    --bg: #f5f7fb;
    --surface: #ffffff;
    --surface-muted: #f8fafc;
    --border: #dbe3ee;
    --text: #142033;
    --text-muted: #5b6b82;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary: #e5edf8;
    --secondary-hover: #d7e3f4;
    --success-bg: #ecfdf3;
    --success-text: #166534;
    --error-bg: #fef2f2;
    --error-text: #b91c1c;
    --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
    --radius: 14px;
    --radius-sm: 10px;
    --container: 960px;
}

* {
    box-sizing: border-box;
}

html {
    font-size: 16px;
}

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, #eff6ff 0%, transparent 30%),
        linear-gradient(180deg, #f8fbff 0%, var(--bg) 100%);
}

a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.container {
    width: min(100% - 2rem, var(--container));
    margin: 0 auto;
}

.site-header {
    border-bottom: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
}

.header-inner {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.brand {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text);
    text-decoration: none;
}

.brand:hover {
    text-decoration: none;
}

.nav {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.nav-user {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.inline-form {
    margin: 0;
}

.page {
    padding: 2rem 0 3rem;
}

.alert {
    margin-bottom: 1rem;
    padding: 0.9rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    border: 1px solid transparent;
}

.alert-success {
    background: var(--success-bg);
    color: var(--success-text);
    border-color: #bbf7d0;
}

.alert-error {
    background: var(--error-bg);
    color: var(--error-text);
    border-color: #fecaca;
}

.auth-section {
    min-height: calc(100vh - 140px);
    display: grid;
    place-items: center;
    padding: 2rem 0;
}

.auth-card {
    width: min(100%, 420px);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 2rem;
}

.auth-header {
    margin-bottom: 1.5rem;
}

.auth-header h1 {
    margin: 0 0 0.5rem;
    font-size: 1.9rem;
    line-height: 1.2;
}

.auth-header p {
    margin: 0;
    color: var(--text-muted);
}

.auth-form,
.stock-form {
    display: grid;
    gap: 1rem;
}

.form-group {
    display: grid;
    gap: 0.45rem;
}

.form-group label {
    font-size: 0.95rem;
    font-weight: 600;
}

.form-group input {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface);
    padding: 0.85rem 0.95rem;
    font: inherit;
    color: var(--text);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-group input::placeholder {
    color: #94a3b8;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 0;
    border-radius: var(--radius-sm);
    background: var(--primary);
    color: #ffffff;
    padding: 0.85rem 1rem;
    font: inherit;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.05s ease;
    text-decoration: none;
}

.button:hover {
    background: var(--primary-hover);
    text-decoration: none;
}

.button:active {
    transform: translateY(1px);
}

.button-secondary {
    background: var(--secondary);
    color: var(--text);
}

.button-secondary:hover {
    background: var(--secondary-hover);
}

.button-full {
    width: 100%;
}

.dashboard-section {
    display: grid;
    gap: 1.5rem;
}

.dashboard-header h1 {
    margin: 0 0 0.4rem;
    font-size: 2rem;
    line-height: 1.15;
}

.dashboard-header p {
    margin: 0;
    color: var(--text-muted);
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
}

.card h2 {
    margin: 0 0 1rem;
    font-size: 1.1rem;
}

.stock-result {
    display: grid;
    gap: 0.4rem;
}

.stock-symbol {
    margin: 0;
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.stock-price {
    margin: 0;
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    line-height: 1;
    color: var(--text);
}

.stock-caption {
    margin: 0;
    color: var(--text-muted);
}

.empty-state {
    display: grid;
    gap: 0.35rem;
    color: var(--text-muted);
    padding: 0.5rem 0;
}

.empty-state p,
.empty-state span {
    margin: 0;
}

.auth-footer {
    margin: 1.25rem 0 0;
    color: var(--text-muted);
    text-align: center;
    font-size: 0.95rem;
}

@media (max-width: 720px) {
    .header-inner {
        padding: 0.75rem 0;
        align-items: flex-start;
        flex-direction: column;
    }

    .dashboard-grid {
        grid-template-columns: 1fr;
    }

    .auth-card,
    .card {
        padding: 1.25rem;
    }

    .dashboard-header h1 {
        font-size: 1.7rem;
    }
}