:root {
    --bg-start: #f8f1ea;
    --bg-end: #fffdfa;
    --panel: rgba(255, 255, 255, 0.88);
    --line: rgba(79, 54, 35, 0.12);
    --text: #231b17;
    --muted: #6e6258;
    --primary: #b86a3f;
    --primary-dark: #8a4f31;
    --danger-bg: #fff1f1;
    --danger-line: #e6b8b8;
    --danger-text: #9a2f2f;
    --shadow: 0 24px 60px rgba(67, 42, 23, 0.14);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: "Avenir Next", "Segoe UI", "Trebuchet MS", sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at top left, rgba(184, 106, 63, 0.16), transparent 28%),
        linear-gradient(180deg, var(--bg-start) 0%, var(--bg-end) 100%);
}

a {
    color: inherit;
    text-decoration: none;
}

.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 24px 16px;
}

.login-shell {
    width: 100%;
    max-width: 440px;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin: 0 0 14px 6px;
    color: var(--muted);
    font-size: 0.96rem;
    font-weight: 700;
    transition: color 0.2s ease, transform 0.2s ease;
}

.back-link:hover {
    color: var(--primary-dark);
    transform: translateX(-2px);
}

.back-link:focus-visible {
    outline: none;
    color: var(--primary-dark);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.login-card {
    width: 100%;
    padding: 28px 22px;
    border: 1px solid rgba(255, 255, 255, 0.72);
    border-radius: 28px;
    background: var(--panel);
    backdrop-filter: blur(14px);
    box-shadow: var(--shadow);
}

.login-brand {
    display: inline-block;
    margin-bottom: 18px;
    font-size: 1.15rem;
    font-weight: 800;
    letter-spacing: 0.02em;
}

.login-card h1 {
    margin: 0 0 10px;
    font-size: clamp(2rem, 5vw, 2.6rem);
    line-height: 1.02;
    letter-spacing: -0.04em;
}

.login-text {
    margin: 0 0 24px;
    color: var(--muted);
    line-height: 1.6;
}

.login-form {
    display: grid;
    gap: 16px;
}

.form-field label {
    display: block;
    margin-bottom: 8px;
    font-weight: 700;
}

.form-field input {
    width: 100%;
    min-height: 54px;
    padding: 0 16px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: #ffffff;
    font: inherit;
    color: var(--text);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-field input:focus {
    outline: none;
    border-color: rgba(184, 106, 63, 0.58);
    box-shadow: 0 0 0 4px rgba(184, 106, 63, 0.12);
}

.login-button {
    min-height: 54px;
    border: 0;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--primary), #d28657);
    color: #ffffff;
    font: inherit;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 16px 32px rgba(184, 106, 63, 0.28);
}

.login-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 18px 38px rgba(184, 106, 63, 0.34);
}

.login-error {
    min-height: 24px;
}

.login-error p {
    margin: 0;
    padding: 12px 14px;
    border: 1px solid var(--danger-line);
    border-radius: 14px;
    background: var(--danger-bg);
    color: var(--danger-text);
    line-height: 1.5;
}

.login-error .login-info {
    border-color: rgba(184, 106, 63, 0.2);
    background: rgba(184, 106, 63, 0.1);
    color: var(--primary-dark);
}

@media (min-width: 768px) {
    .login-card {
        padding: 34px 30px;
    }
}