:root {
    --color-primary: #1e6f7a;
    --color-primary-dark: #14515a;
    --color-accent: #2f8f98;
    --color-accent-hover: #256f76;
    --color-danger: #c0392b;
    --color-danger-bg: #fdecea;
    --color-success: #2e7d32;
    --color-success-bg: #eaf6ec;
    --color-text: #24292d;
    --color-muted: #6b7278;
    --color-border: #e5e8ea;
    --color-bg-top: #eef3f4;
    --color-bg-bottom: #e3edee;
    --shadow: 0 8px 30px rgba(20, 40, 45, 0.08);
    --radius: 14px;
}

* {
    box-sizing: border-box;
}

html, body {
    height: 100%;
}

body.app-shell {
    margin: 0;
    background: linear-gradient(180deg, var(--color-bg-top), var(--color-bg-bottom));
    font-family: "Segoe UI", Arial, Helvetica, sans-serif;
    color: var(--color-text);
    display: flex;
    flex-direction: column;
    min-height: 100%;
}

.app-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2.5rem 1rem;
}

.app-brand {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 1.75rem;
    color: var(--color-primary-dark);
    font-weight: 700;
    font-size: 1.05rem;
    letter-spacing: 0.01em;
}

.app-brand-mark {
    width: 30px;
    height: 30px;
    border-radius: 8px;
    background: var(--color-primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    font-weight: 700;
}

.app-card {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 2.75rem;
    max-width: 640px;
    width: 100%;
}

.app-card h1 {
    font-size: 1.3rem;
    margin: 0 0 0.6rem;
    color: var(--color-text);
    font-weight: 650;
}

.app-card p {
    line-height: 1.55;
    color: var(--color-muted);
    margin: 0 0 0.75rem;
}

.status-icon {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    margin-bottom: 1.1rem;
}

.status-icon.error {
    background: var(--color-danger-bg);
    color: var(--color-danger);
}

.status-icon.success {
    background: var(--color-success-bg);
    color: var(--color-success);
}

.app-alert {
    border-radius: 10px;
    padding: 0.9rem 1.1rem;
    margin: 1rem 0 1.5rem;
    font-size: 0.92rem;
    line-height: 1.5;
}

.app-alert.error {
    background: var(--color-danger-bg);
    color: var(--color-danger);
    border: 1px solid rgba(192, 57, 43, 0.2);
}

.app-alert code {
    display: block;
    margin-top: 0.5rem;
    font-size: 0.8rem;
    word-break: break-all;
    color: inherit;
    opacity: 0.85;
}

.app-actions {
    display: flex;
    gap: 0.7rem;
    margin-top: 1.75rem;
    flex-wrap: wrap;
}

.app-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.65rem 1.5rem;
    border-radius: 8px;
    border: none;
    font-size: 0.92rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.15s ease, transform 0.05s ease, border-color 0.15s ease;
}

.app-btn:active {
    transform: scale(0.98);
}

.app-btn-primary {
    background: var(--color-accent);
    color: #fff;
}

.app-btn-primary:hover {
    background: var(--color-accent-hover);
}

.app-btn-secondary {
    background: #fff;
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.app-btn-secondary:hover {
    border-color: #c9cfd2;
    background: #fafbfb;
}

.app-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.25rem 0;
    font-size: 0.9rem;
}

.app-table th, .app-table td {
    text-align: left;
    padding: 0.6rem 0.8rem;
    border-bottom: 1px solid var(--color-border);
}

.app-table th {
    background: #f7f9fa;
    color: var(--color-muted);
    font-weight: 650;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.app-kv {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0.45rem 1.25rem;
    margin: 1.25rem 0;
    font-size: 0.92rem;
    padding: 1rem 1.1rem;
    background: #f7f9fa;
    border-radius: 10px;
}

.app-kv dt {
    color: var(--color-muted);
    font-weight: 650;
}

.app-kv dd {
    margin: 0;
    word-break: break-all;
}

.app-loader-wrapper {
    text-align: center;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 3rem 3.5rem;
}

.app-loader-wrapper p {
    color: var(--color-muted);
    margin: 0;
}

.app-spinner {
    width: 42px;
    height: 42px;
    margin: 0 auto 1.25rem;
    border: 4px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: app-spin 0.8s linear infinite;
}

@keyframes app-spin {
    to {
        transform: rotate(360deg);
    }
}