:root {
    --bg: #f7fbfc;
    --card: #ffffff;
    --text: #17323a;
    --muted: #5f7a82;
    --accent: #2b8fa3;
    --accent-dark: #1f6d7d;
    --border: #d8e8ec;
    --radius: 18px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.5;
}

a {
    color: var(--accent-dark);
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 16px 24px;
    background: rgba(255, 255, 255, 0.86);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
}

.brand {
    font-size: 1.2rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--text);
}

.top-nav {
    display: flex;
    align-items: center;
    gap: 18px;
    margin-left: auto;
}

.inline-form {
    display: inline;
    margin: 0;
}

.link-button {
    border: 0;
    background: transparent;
    color: var(--accent-dark);
    font: inherit;
    cursor: pointer;
    padding: 0;
}

.btn,
.auth-button {
    display: inline-block;
    border: 0;
    border-radius: 999px;
    background: var(--accent);
    color: #fff;
    text-decoration: none;
    padding: 10px 18px;
    font: inherit;
    cursor: pointer;
}

.btn:hover,
.auth-button:hover {
    background: var(--accent-dark);
}

.auth-button {
    background: rgba(43, 143, 163, 0.12);
    color: var(--accent-dark);
    border: 1px solid var(--border);
}

.auth-button:hover {
    background: rgba(43, 143, 163, 0.2);
}

.container {
    width: min(1080px, calc(100% - 32px));
    margin: 0 auto;
    padding: 28px 0 60px;
}

.hero {
    min-height: 62vh;
    border-radius: 28px;
    padding: 32px;
    display: flex;
    align-items: flex-end;
    color: #fff;
    background:
        linear-gradient(165deg, rgba(22, 64, 77, 0.18), rgba(14, 31, 37, 0.58)),
        url('images/hero.jpg') center / cover no-repeat,
        linear-gradient(135deg, #8ec9d6, #4a7f8d);
}

.hero-inner {
    max-width: 650px;
}

.hero h1 {
    margin: 0 0 10px;
    font-size: clamp(2.3rem, 6vw, 4.3rem);
    line-height: 1.05;
}

.hero p {
    margin: 0;
    font-size: 1.05rem;
    color: rgba(255, 255, 255, 0.92);
}

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 18px;
    margin-top: 24px;
}

.card,
.panel-card,
.auth-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: 0 10px 30px rgba(23, 50, 58, 0.05);
}

.card {
    padding: 22px;
}

.card h2 {
    margin-top: 0;
    margin-bottom: 8px;
}

.card p,
.panel-card p {
    color: var(--muted);
}

.auth-card {
    width: min(430px, 100%);
    margin: 30px auto;
    padding: 28px;
}

.auth-card.wide {
    width: min(560px, 100%);
}

.auth-card h1 {
    margin-top: 0;
}

form p {
    margin: 0 0 14px;
}

input,
textarea,
select {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 11px 12px;
    font: inherit;
    background: #fff;
    color: var(--text);
}

input:focus,
textarea:focus,
select:focus {
    outline: 2px solid rgba(43, 143, 163, 0.35);
    border-color: var(--accent);
}

.messages {
    list-style: none;
    width: min(1080px, calc(100% - 32px));
    margin: 18px auto 0;
    padding: 0;
}

.messages li {
    padding: 12px 14px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: #fff;
    margin-bottom: 8px;
}

.messages li.success {
    border-color: #bfe5c9;
    background: #f0faf2;
}

.messages li.error {
    border-color: #f0c2c2;
    background: #fff4f4;
}

.panel-card {
    padding: 22px;
    margin-bottom: 18px;
}

.qr {
    width: 190px;
    height: auto;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: #fff;
}

.link-box {
    width: 100%;
    min-height: 96px;
    resize: vertical;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.92rem;
}

.small-code {
    display: inline-block;
    word-break: break-all;
    background: #f4fafb;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 8px 10px;
    font-size: 0.9rem;
}

.site-footer {
    padding: 24px;
    text-align: center;
    color: var(--muted);
    border-top: 1px solid var(--border);
}

@media (max-width: 640px) {
    .site-header {
        padding: 14px 16px;
    }

    .container {
        width: calc(100% - 24px);
        padding-top: 20px;
    }

    .hero {
        min-height: 54vh;
        padding: 22px;
    }
}

.form-actions {
    display: flex;
    gap: 12px;
    margin-top: 16px;
}

.btn-secondary {
    background: transparent;
    color: var(--muted);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--bg);
    color: var(--text);
}