:root {
    --primary: #2f5d50;
    --primary-dark: #203f36;
    --primary-soft: #e8f0ed;
    --accent: #d5a84b;
    --background: #f4f7f5;
    --surface: #ffffff;
    --text: #1f2933;
    --muted: #667085;
    --border: #d7e1dc;
    --error: #b42318;
    --error-soft: #fdecea;
    --success: #2f7d45;
    --success-soft: #eaf6ec;
    --info: #245b8a;
    --info-soft: #e9f2fb;
    --shadow: 0 18px 42px rgba(31, 41, 51, 0.11);
    --radius: 16px;
    --max-width: 1180px;
}

* { box-sizing: border-box; }
html {
    scroll-behavior: smooth;
    scrollbar-gutter: stable;
}
body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-family: Arial, Helvetica, sans-serif;
    color: var(--text);
    background: var(--background);
    line-height: 1.6;
}
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }
button, input { font: inherit; }

.site-header {
     position: sticky;
     top: 0;
     z-index: 20;
     background: rgba(255, 255, 255, 0.96);
     border-bottom: 1px solid var(--border);
     backdrop-filter: blur(12px);
 }
.navbar {
    width: min(100% - 2rem, var(--max-width));
    min-height: 74px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.brand {
    margin-right: auto;
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--primary-dark);
}

.nav-links,
.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}
.nav-links a {
    padding-bottom: 0.2rem;
    font-weight: 600;
}

.nav-links a.active {
    color: var(--primary-dark);
    border-bottom: 2px solid var(--accent);
}

.nav-actions form {
    margin: 0;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 0.7rem 1.1rem;
    border: 1px solid transparent;
    border-radius: 9px;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s ease, background-color 0.2s ease;
}
.button:hover { transform: translateY(-1px); }
.button-primary { color: #ffffff; background: var(--primary); }
.button-primary:hover { color: #ffffff; background: var(--primary-dark); }
.button-secondary {
    color: var(--primary-dark);
    background: var(--surface);
    border-color: var(--border);
}
.button-secondary:hover { color: var(--primary-dark); background: var(--primary-soft); }

.auth-layout {
    width: min(100% - 2rem, var(--max-width));
    margin: 0 auto;
    padding: 4rem 0;
    flex: 1;
    display: grid;
    grid-template-columns: 1fr 460px;
    align-items: center;
    gap: 5rem;
}
.auth-introduction { max-width: 650px; }
.eyebrow {
    margin: 0 0 0.55rem;
    color: var(--primary);
    font-size: 0.8rem;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}
.auth-introduction h1 {
    margin: 0;
    color: var(--primary-dark);
    font-size: clamp(3rem, 6vw, 5rem);
    line-height: 1.04;
}
.auth-introduction > p:not(.eyebrow) {
    max-width: 600px;
    margin: 1.5rem 0;
    color: var(--muted);
    font-size: 1.1rem;
}
.auth-introduction ul {
    margin: 0;
    padding: 0;
    display: grid;
    gap: 0.8rem;
    list-style: none;
}
.auth-introduction li {
    position: relative;
    padding-left: 1.8rem;
    font-weight: 600;
}
.auth-introduction li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: 900;
}

.auth-card {
    padding: 2rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    box-shadow: var(--shadow);
}
.auth-card-heading h2 {
    margin: 0;
    color: var(--primary-dark);
    font-size: 2rem;
}
.auth-card-heading > p:not(.eyebrow) { margin-top: 0.4rem; color: var(--muted); }
.auth-form {
    margin-top: 1.5rem;
    display: grid;
    gap: 1.2rem;
}
.form-group { display: grid; gap: 0.45rem; }
.form-group label { color: var(--primary-dark); font-weight: 700; }
.form-group input {
    width: 100%;
    min-height: 48px;
    padding: 0.75rem 0.85rem;
    border: 1px solid var(--border);
    border-radius: 9px;
    color: var(--text);
    background: #ffffff;
}
.form-group input:focus {
    outline: 3px solid rgba(47, 93, 80, 0.14);
    border-color: var(--primary);
}
.form-group.has-error input { border-color: var(--error); }
.form-group.has-error input:focus { outline-color: rgba(180, 35, 24, 0.14); }
.field-error { color: var(--error); font-size: 0.88rem; font-weight: 700; }
.form-note {
    padding: 0.85rem 1rem;
    border-left: 4px solid var(--accent);
    border-radius: 8px;
    color: var(--muted);
    background: #fffaf0;
    font-size: 0.92rem;
}
.submit-button { width: 100%; margin-top: 0.2rem; }
.message {
    margin-top: 1rem;
    padding: 0.85rem 1rem;
    border: 1px solid transparent;
    border-radius: 9px;
    font-weight: 600;
}
.message-error { color: var(--error); background: var(--error-soft); border-color: rgba(180,35,24,.25); }
.message-success { color: var(--success); background: var(--success-soft); border-color: rgba(47,125,69,.25); }
.message-info { color: var(--info); background: var(--info-soft); border-color: rgba(36,91,138,.25); }
.auth-switch { margin: 1.5rem 0 0; text-align: center; color: var(--muted); }
.auth-switch a { font-weight: 800; }
.back-link { display: block; margin-top: 0.7rem; text-align: center; font-size: 0.92rem; font-weight: 700; }

.site-footer {
    padding: 1.7rem max(1rem, calc((100% - var(--max-width)) / 2));
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    color: #dbe8e3;
    background: var(--primary-dark);
}
.site-footer p { margin: 0; }
.site-footer nav { display: flex; gap: 1rem; }
.site-footer a { color: #ffffff; }
.site-footer a:hover { color: var(--accent); }

@media (max-width: 920px) {
    .navbar {
        padding: 1rem 0;
        flex-wrap: wrap;
    }

    .brand {
        width: 100%;
    }

    .nav-links,
    .nav-actions {
        flex-wrap: wrap;
    }

    .auth-layout {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }

    .auth-introduction {
        max-width: none;
    }

    .auth-card {
        width: min(100%, 540px);
    }
}
@media (max-width: 620px) {
    .navbar,
    .nav-links,
    .nav-actions {
        width: 100%;
        align-items: stretch;
        flex-direction: column;
    }

    .auth-layout {
        width: min(100% - 1rem, var(--max-width));
        padding: 2.5rem 0;
    }

    .auth-introduction h1 {
        font-size: 3rem;
    }

    .auth-card {
        padding: 1.2rem;
    }

    .button {
        width: 100%;
    }

    .site-footer {
        align-items: flex-start;
        flex-direction: column;
    }
}