:root {
    --bg: #f5f7fb;
    --card: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --border: #e5e7eb;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}
* {
    box-sizing: border-box;
}
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
}
/* ===== HEADER ===== */
.site-header {
    background: white;
    border-bottom: 1px solid var(--border);
}
.header-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 18px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.brand-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--text);
}
.brand-subtitle {
    margin: 2px 0 0;
    font-size: 13px;
    color: var(--muted);
}
.nav a {
    margin-left: 12px;
    text-decoration: none;
    color: var(--text);
    font-size: 14px;
    padding: 6px 10px;
    border-radius: 8px;
    transition: 0.2s;
}
.nav a:hover {
    background: var(--bg);
}
/* ===== MAIN ===== */
.main {
    max-width: 1100px;
    margin: 0 auto;
    padding: 24px 20px 40px;
}
/* ===== HERO ===== */
.hero {
    background: linear-gradient(135deg, #1d4ed8 0%, #2563eb 45%, #60a5fa 100%);
    color: white;
    border-radius: 28px;
    padding: 46px 36px;
    box-shadow: var(--shadow);
    margin-bottom: 26px;
}
.hero h1 {
    margin: 0 0 14px;
    font-size: 48px;
    line-height: 1.05;
    max-width: 760px;
}
.hero p {
    margin: 0;
    max-width: 760px;
    color: rgba(255, 255, 255, 0.94);
    font-size: 20px;
    line-height: 1.5;
}
/* ===== BUTTONS ===== */
.actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 24px;
}
.btn {
    display: inline-block;
    padding: 12px 18px;
    background: var(--primary);
    color: white;
    text-decoration: none;
    border-radius: 12px;
    font-weight: 600;
    font-size: 15px;
    border: none;
    cursor: pointer;
    transition: 0.2s;
}
.btn:hover {
    background: var(--primary-dark);
}
.btn-outline {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}
.btn-outline:hover {
    background: rgba(255, 255, 255, 0.3);
}
.btn-secondary {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}
.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.3);
}
/* ===== CARDS ===== */
.grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.card {
    background: var(--card);
    border-radius: 18px;
    padding: 22px;
    box-shadow: var(--shadow);
}
.card h2 {
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 20px;
}
.card p {
    margin: 0 0 10px;
    font-size: 14px;
    line-height: 1.5;
}
.muted {
    color: var(--muted);
}
/* ===== AUTH FORMS (login, register) ===== */
.auth-card {
    background: var(--card);
    border-radius: 20px;
    padding: 36px 40px;
    max-width: 460px;
    margin: 40px auto;
    box-shadow: var(--shadow);
}
.auth-card h1 {
    margin: 0 0 8px;
    font-size: 26px;
    color: var(--text);
}
.auth-card p {
    margin: 0 0 24px;
    color: var(--muted);
    font-size: 14px;
    line-height: 1.5;
}
.form-group {
    margin-bottom: 16px;
}
.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 6px;
}
.form-group input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: 15px;
    color: var(--text);
    background: var(--bg);
    transition: border-color 0.2s;
    outline: none;
}
.form-group input:focus {
    border-color: var(--primary);
    background: white;
}
.auth-card .btn {
    width: 100%;
    text-align: center;
    margin-top: 8px;
    padding: 12px;
}
.auth-card a {
    color: var(--primary);
    text-decoration: none;
}
.auth-card a:hover {
    text-decoration: underline;
}
/* ===== ALERTS ===== */
.alert {
    padding: 12px 16px;
    border-radius: 10px;
    margin-bottom: 16px;
    font-size: 14px;
}
.alert-error {
    background: #fef2f2;
    color: #dc2626;
    border: 1px solid #fecaca;
}
.alert-success {
    background: #f0fdf4;
    color: #16a34a;
    border: 1px solid #bbf7d0;
}
/* ===== PROFILE / WAITING ===== */
.profile-card {
    background: var(--card);
    border-radius: 20px;
    padding: 32px 36px;
    max-width: 600px;
    margin: 40px auto;
    box-shadow: var(--shadow);
}
.profile-card h1 {
    margin: 0 0 20px;
    font-size: 24px;
}
/* ===== FOOTER ===== */
.footer {
    text-align: center;
    padding: 20px;
    font-size: 13px;
    color: var(--muted);
}
/* ===== MOBILE ===== */
@media (max-width: 900px) {
    .grid {
        grid-template-columns: 1fr;
    }
}
@media (max-width: 700px) {
    .hero {
        padding: 30px 22px;
        border-radius: 22px;
    }
    .hero h1 {
        font-size: 32px;
    }
    .hero p {
        font-size: 17px;
    }
    .header-inner {
        align-items: flex-start;
        flex-direction: column;
        gap: 12px;
    }
    .auth-card {
        padding: 24px 20px;
        margin: 20px 16px;
    }
}