:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #38bdf8;
    --accent-hover: #0ea5e9;
    --border: #334155;
    --card-bg: rgba(30, 41, 59, 0.7);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

header {
    border-bottom: 1px solid var(--border);
    padding: 1.2rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(8px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-primary);
    text-decoration: none;
}

.logo svg {
    fill: var(--accent);
    width: 24px;
    height: 24px;
}

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    margin-left: 1.5rem;
    font-size: 0.95rem;
    transition: color 0.2s ease;
}

nav a:hover {
    color: var(--text-primary);
}

.btn {
    background-color: var(--accent);
    color: #0f172a;
    padding: 0.65rem 1.4rem;
    border-radius: 6px;
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
    transition: background-color 0.2s ease, border-color 0.2s ease;
    border: 1px solid transparent;
    cursor: pointer;
    font-size: 0.95rem;
}

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

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-outline:hover {
    background: var(--bg-secondary);
    border-color: var(--accent);
}

.btn-full {
    width: 100%;
    margin-top: 0.5rem;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.hero {
    padding: 6rem 0 4rem;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}

.hero h1 span {
    color: var(--accent);
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 650px;
    margin: 0 auto 2.5rem;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    padding: 4rem 0;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.card:hover {
    transform: translateY(-3px);
    border-color: var(--accent);
}

.card-icon {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: var(--accent);
}

.card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.status-box {
    background: var(--bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--border);
    padding: 2rem;
    margin: 3rem 0;
    display: flex;
    justify-content: space-around;
    text-align: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.status-item .val {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent);
}

.status-item .lbl {
    color: var(--text-secondary);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.login-section {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    max-width: 420px;
    margin: 2rem auto 5rem;
    padding: 2.5rem;
}

.login-section h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    text-align: center;
}

.login-section p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-align: center;
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1.2rem;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    margin-bottom: 0.4rem;
    color: var(--text-secondary);
}

.form-group input {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.2s ease;
}

.form-group input:focus {
    border-color: var(--accent);
}

footer {
    border-top: 1px solid var(--border);
    padding: 2.5rem 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.footer-subtext {
    margin-top: 0.4rem;
    font-size: 0.75rem;
    color: #64748b;
}

/* Оповещения в форме */
.alert-box {
    padding: 0.75rem 1rem;
    border-radius: 6px;
    margin-bottom: 1.2rem;
    font-size: 0.85rem;
    border: 1px solid transparent;
}

.alert-box.error {
    background: rgba(239, 68, 68, 0.15);
    border-color: #ef4444;
    color: #fca5a5;
}

.hidden {
    display: none !important;
}

/* Спиннер загрузки на кнопке */
.btn-spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(15, 23, 42, 0.3);
    border-top-color: #0f172a;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    vertical-align: middle;
}

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

/* Модальное окно API */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(6px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 10px;
    width: 90%;
    max-width: 600px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
    overflow: hidden;
}

.modal-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 1.1rem;
    color: var(--accent);
}

.modal-close {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
}

.modal-body {
    padding: 1.5rem;
    background: #0b1120;
    overflow-x: auto;
}

.modal-body pre {
    color: #38bdf8;
    font-family: monospace;
    font-size: 0.85rem;
    line-height: 1.5;
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.2rem;
    }
    nav {
        display: none;
    }
}