:root {
    --auth-font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", sans-serif;
    --auth-bg: linear-gradient(180deg, #f5f7fb 0%, #eef2f7 100%);
    --auth-card-bg: rgba(255, 255, 255, 0.78);
    --auth-card-border: rgba(255, 255, 255, 0.62);
    --auth-card-shadow: 0 14px 36px rgba(15, 23, 42, 0.10);
    --auth-text-primary: #1d1d1f;
    --auth-text-secondary: #6e6e73;
    --auth-link: #0071e3;
    --auth-link-hover: #005bb5;
    --auth-focus-ring: rgba(0, 113, 227, 0.18);
    --auth-border-soft: rgba(15, 23, 42, 0.12);
    --auth-input-bg: rgba(255, 255, 255, 0.84);
    --auth-danger: #b42318;
    --auth-danger-soft: #fff2f0;
    --auth-success: #027a48;
    --auth-success-soft: #ecfdf3;
}

html {
    min-height: 100%;
}

body.auth-page {
    min-height: 100vh;
    margin: 0;
    font-family: var(--auth-font-family);
    color: var(--auth-text-primary);
    background: var(--auth-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.auth-page a {
    color: var(--auth-link);
    text-decoration: none;
}

.auth-page a:hover {
    color: var(--auth-link-hover);
    text-decoration: underline;
}

.auth-shell {
    width: min(100%, 760px);
    margin: 0 auto;
    padding: 3rem 1rem 2rem;
}

.auth-shell.auth-shell-narrow {
    width: min(100%, 540px);
}

.auth-logo {
    display: flex;
    justify-content: center;
    margin-bottom: 1.4rem;
}

.auth-logo img {
    width: 184px;
    height: auto;
}

.auth-card,
.login-container,
.register-container {
    position: relative;
    background: var(--auth-card-bg);
    border: 1px solid var(--auth-card-border);
    backdrop-filter: blur(24px) saturate(140%);
    -webkit-backdrop-filter: blur(24px) saturate(140%);
    box-shadow: var(--auth-card-shadow);
    border-radius: 28px;
    padding: 1.9rem;
}

.auth-card::before,
.login-container::before,
.register-container::before {
    content: "";
    position: absolute;
    inset: 1px;
    border-radius: inherit;
    pointer-events: none;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.52), rgba(255, 255, 255, 0.1));
    opacity: 0.65;
}

.auth-card > *,
.login-container > *,
.register-container > * {
    position: relative;
    z-index: 1;
}

.auth-kicker {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.42rem 0.78rem;
    margin-bottom: 0.9rem;
    border-radius: 999px;
    background: rgba(0, 113, 227, 0.08);
    color: var(--auth-link);
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.01em;
}

.auth-title,
.login-title,
.register-title,
.form-header h2 {
    margin-bottom: 0.45rem;
    font-size: clamp(1.7rem, 2.7vw, 2.15rem);
    font-weight: 600;
    letter-spacing: -0.03em;
    color: var(--auth-text-primary);
}

.auth-subtitle,
.register-subtitle,
.form-header p {
    margin-bottom: 1.4rem;
    color: var(--auth-text-secondary);
    font-size: 0.98rem;
    line-height: 1.5;
}

.form-floating > .form-control,
.form-floating > .form-select,
.input-group .form-control {
    min-height: calc(3.85rem + 2px);
    height: calc(3.85rem + 2px);
    border-radius: 16px;
    border: 1px solid var(--auth-border-soft);
    background: var(--auth-input-bg);
    color: var(--auth-text-primary);
    padding-top: 1.55rem;
}

.form-floating > .form-control::placeholder,
.form-floating > .form-select::placeholder,
.input-group .form-control::placeholder {
    color: transparent;
}

.form-floating > label {
    color: var(--auth-text-secondary);
    padding-left: 1rem;
}

.auth-back-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.4rem;
    height: 2.4rem;
    margin-bottom: 1rem;
    border-radius: 999px;
    border: 1px solid rgba(15, 23, 42, 0.08);
    background: rgba(255, 255, 255, 0.52);
    color: var(--auth-text-primary);
    text-decoration: none;
    box-shadow: 0 8px 20px rgba(15, 23, 42, 0.08);
}

.auth-back-link:hover {
    background: rgba(255, 255, 255, 0.84);
    color: var(--auth-text-primary);
    text-decoration: none;
}

.form-control:focus,
.form-select:focus,
.input-group .form-control:focus {
    border-color: var(--auth-link);
    box-shadow: 0 0 0 4px var(--auth-focus-ring);
}

.input-group .btn {
    border-color: var(--auth-border-soft);
    border-radius: 0 16px 16px 0;
    background: rgba(255, 255, 255, 0.72);
    color: var(--auth-text-primary);
}

.input-group .btn:hover {
    background: rgba(255, 255, 255, 0.95);
}

.auth-submit,
.btn-primary,
.btn-register {
    min-height: 52px;
    border: none;
    border-radius: 16px;
    background: linear-gradient(180deg, #0a84ff 0%, #0071e3 100%);
    box-shadow: 0 14px 32px rgba(0, 113, 227, 0.24);
    font-weight: 600;
    letter-spacing: -0.01em;
}

.auth-submit:hover,
.auth-submit:focus,
.btn-primary:hover,
.btn-primary:focus,
.btn-register:hover,
.btn-register:focus {
    background: linear-gradient(180deg, #2791ff 0%, #0062c3 100%);
}

.alert,
.feedback-global {
    border-radius: 16px;
    padding: 0.95rem 1rem;
    border: 1px solid transparent;
}

.alert-danger,
.feedback-global {
    border-color: rgba(180, 35, 24, 0.14);
    background: var(--auth-danger-soft);
    color: #7a271a;
}

.alert-success {
    border-color: rgba(2, 122, 72, 0.18);
    background: var(--auth-success-soft);
    color: #05603a;
}

.alert-info {
    border-color: rgba(0, 113, 227, 0.14);
    background: rgba(0, 113, 227, 0.08);
    color: #0b4a88;
}

.auth-meta,
.apple-link,
.register-link,
.form-footer {
    text-align: center;
    color: var(--auth-text-secondary);
}

.auth-meta,
.apple-link,
.register-link {
    margin-top: 1rem;
}

.form-footer {
    margin-top: 1.75rem;
}

.field-error {
    color: var(--auth-danger);
    font-size: 0.875rem;
    margin-top: 0.45rem;
    padding-left: 0.25rem;
}

.is-invalid,
.is-invalid:focus {
    border-color: rgba(180, 35, 24, 0.55);
    box-shadow: none;
}

.form-check {
    margin-top: 1rem;
}

.form-check-label {
    color: var(--auth-text-secondary);
}

.form-check-input {
    border-color: var(--auth-border-soft);
}

.auth-password-group {
    position: relative;
}

.auth-password-group .form-control {
    padding-right: 3.15rem;
}

.auth-password-toggle {
    position: absolute;
    top: 50%;
    right: 0.55rem;
    transform: translateY(-50%);
    z-index: 5;
    width: 2.35rem;
    height: 2.35rem;
    border: 0;
    border-radius: 999px;
    background: transparent;
    color: var(--auth-text-secondary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.18s ease, transform 0.18s ease, color 0.18s ease;
}

.auth-password-toggle:hover {
    background: rgba(0, 113, 227, 0.08);
    color: var(--auth-link);
    transform: translateY(-50%) scale(1.03);
}

.auth-note {
    color: var(--auth-text-secondary);
    font-size: 0.92rem;
    line-height: 1.45;
    text-align: center;
}

.auth-card-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
}

.auth-inline-link {
    color: var(--auth-text-secondary);
    font-size: 0.92rem;
}

.auth-inline-link:hover {
    color: var(--auth-link);
}

.form-check-input:checked {
    background-color: var(--auth-link);
    border-color: var(--auth-link);
}

.auth-card-success {
    border-color: rgba(2, 122, 72, 0.18);
}

@media (max-width: 768px) {
    .auth-shell {
        padding-top: 2.5rem;
    }

    .auth-card,
    .login-container,
    .register-container {
        border-radius: 24px;
        padding: 1.5rem;
    }
}