*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --coral: #D33F2A;
    --coral-hover: #B83A26;
    --coral-soft: #FFE9E5;
    --bg: #F4F6FA;
    --surface: #FFFFFF;
    --surface-2: #F7F9FC;
    --surface-hover: #EEF1F6;
    --border: #E4E9F0;
    --border-strong: #D8DFE8;
    --text: #0F1B2D;
    --text-muted: #4A5E7E;
    --text-subtle: #5C6C87;
    --green: #10B981;
    --green-soft: #D1FAE5;
    --red: #DC2626;
    --red-soft: #FEE2E2;
    --shadow: 0 1px 2px rgba(15, 27, 45, 0.04), 0 12px 34px rgba(15, 27, 45, 0.12);
}

html[data-theme="dark"] {
    --coral: #FF8B7E;
    --coral-hover: #FF6B5B;
    --coral-soft: rgba(255, 107, 91, 0.16);
    --bg: #0B1420;
    --surface: #16243A;
    --surface-2: #1F2F47;
    --surface-hover: #2C3E5C;
    --border: #2C3E5C;
    --border-strong: #4A5E7E;
    --text: #F7F9FC;
    --text-muted: #B5C0D0;
    --text-subtle: #8FA0B8;
    --green: #34D399;
    --green-soft: rgba(16, 185, 129, 0.18);
    --red: #F87171;
    --red-soft: rgba(220, 38, 38, 0.18);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.24), 0 16px 42px rgba(0, 0, 0, 0.45);
}

body {
    align-items: center;
    background:
        linear-gradient(180deg, rgba(255, 107, 91, 0.08), rgba(255, 255, 255, 0) 42%),
        var(--bg);
    color: var(--text);
    display: flex;
    font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, sans-serif;
    justify-content: center;
    line-height: 1.5;
    min-height: 100vh;
    padding: 24px;
}

.auth-theme-toggle {
    align-items: center;
    background: var(--surface);
    border: 1px solid var(--border-strong);
    border-radius: 999px;
    box-shadow: 0 4px 16px rgba(15, 27, 45, 0.08);
    color: var(--text-muted);
    cursor: pointer;
    display: inline-flex;
    font: inherit;
    font-size: 13px;
    font-weight: 800;
    gap: 8px;
    min-height: 36px;
    padding: 7px 12px;
    position: fixed;
    right: 18px;
    top: 18px;
    width: auto;
    z-index: 10;
}

.auth-theme-toggle:hover {
    background: var(--surface-hover);
    color: var(--text);
}

.auth-theme-toggle .dark-label,
html[data-theme="dark"] .auth-theme-toggle .light-label {
    display: none;
}

html[data-theme="dark"] .auth-theme-toggle .dark-label {
    display: inline;
}

.login-card,
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: var(--shadow);
    padding: 32px;
    width: 100%;
}

.login-card {
    max-width: 460px;
}

.card {
    max-width: 440px;
    text-align: center;
}

.brand,
.auth-brand {
    align-items: center;
    color: var(--text);
    display: flex;
    font-size: 16px;
    font-weight: 800;
    gap: 10px;
    margin-bottom: 18px;
}

.auth-mark {
    align-items: center;
    background: var(--coral);
    border-radius: 8px;
    color: white;
    display: inline-flex;
    font-size: 14px;
    font-weight: 900;
    height: 30px;
    justify-content: center;
    width: 30px;
}

.brand::before {
    align-items: center;
    background: var(--coral);
    border-radius: 8px;
    color: white;
    content: "R";
    display: inline-flex;
    font-size: 14px;
    font-weight: 900;
    height: 30px;
    justify-content: center;
    width: 30px;
}

h1,
.login-card h1,
.card h1 {
    color: var(--text);
    font-size: 28px;
    font-weight: 800;
    letter-spacing: 0;
    line-height: 1.15;
    margin-bottom: 8px;
}

.subtitle,
.login-card p.subtitle,
.card p {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 22px;
}

.form-group {
    margin-bottom: 16px;
}

.form-row {
    display: flex;
    gap: 12px;
}

.form-row .form-group {
    flex: 1;
}

.form-group label {
    color: var(--text-muted);
    display: block;
    font-size: 12.5px;
    font-weight: 700;
    margin-bottom: 6px;
}

.form-group input {
    background: var(--surface-2);
    border: 1px solid var(--border-strong);
    border-radius: 8px;
    color: var(--text);
    font: inherit;
    outline: none;
    padding: 10px 12px;
    transition: border-color 0.15s, box-shadow 0.15s, background 0.15s;
    width: 100%;
}

.form-group input:focus {
    background: var(--surface);
    border-color: var(--coral);
    box-shadow: 0 0 0 3px var(--coral-soft);
}

.field-hint {
    color: var(--text-subtle);
    font-size: 12px;
    margin-top: 4px;
}

.password-field {
    position: relative;
}

.password-field input {
    padding-right: 60px;
}

.password-toggle {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font: inherit;
    font-size: 12.5px;
    font-weight: 600;
    padding: 4px 8px;
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
}

.password-toggle:hover,
.password-toggle:focus-visible {
    color: var(--coral);
}

.password-toggle:focus-visible {
    outline: 2px solid var(--coral-soft);
    outline-offset: 2px;
}

.resend-form {
    margin-top: 12px;
    text-align: center;
}

.resend-form .link-button {
    background: none;
    border: none;
    color: var(--coral);
    cursor: pointer;
    font: inherit;
    font-size: 13.5px;
    font-weight: 600;
    padding: 6px 8px;
    text-decoration: underline;
}

.resend-form .link-button:disabled {
    color: var(--text-subtle);
    cursor: not-allowed;
    text-decoration: none;
}

.form-group input[readonly] {
    cursor: not-allowed;
    opacity: 0.72;
}

button[type="submit"],
.button-link,
a.btn {
    align-items: center;
    background: var(--coral);
    border: 1px solid var(--coral);
    border-radius: 8px;
    color: white;
    cursor: pointer;
    display: inline-flex;
    font: inherit;
    font-size: 14px;
    font-weight: 800;
    justify-content: center;
    min-height: 42px;
    padding: 10px 14px;
    text-decoration: none;
    transition: background 0.15s, border-color 0.15s, transform 0.15s;
    width: 100%;
}

button[type="submit"]:hover,
.button-link:hover,
a.btn:hover {
    background: var(--coral-hover);
    border-color: var(--coral-hover);
}

/* Dark-mode coral (#FF8B7E) is too light for white button text — use navy instead. */
html[data-theme="dark"] button[type="submit"],
html[data-theme="dark"] .button-link,
html[data-theme="dark"] a.btn {
    color: #0F1B2D;
}

.auth-links {
    display: grid;
    gap: 10px;
    margin-top: 18px;
}

.auth-link,
.context-panel,
.notice {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    display: block;
    font-size: 13px;
    padding: 13px 14px;
    text-decoration: none;
}

.auth-link:hover {
    background: var(--surface-hover);
    border-color: var(--border-strong);
}

.auth-link span,
.context-panel .meta {
    color: var(--text-subtle);
    display: block;
    font-size: 12px;
    margin-top: 3px;
}

.context-panel,
.notice {
    line-height: 1.45;
    margin-bottom: 18px;
}

.context-panel strong,
.notice strong,
.subtitle strong {
    color: var(--text);
}

.invite-badge {
    align-items: center;
    background: var(--green-soft);
    border-radius: 999px;
    color: #047857;
    display: inline-flex;
    font-size: 12px;
    font-weight: 800;
    margin-bottom: 12px;
    padding: 4px 9px;
}

.error-summary {
    background: var(--red-soft);
    border: 1px solid rgba(220, 38, 38, 0.24);
    border-radius: 8px;
    color: var(--red);
    font-size: 13px;
    margin-bottom: 18px;
    padding: 11px 12px;
}

.login-link {
    color: var(--text-muted);
    font-size: 13px;
    margin-top: 16px;
    text-align: center;
}

.login-link a,
.context-panel a,
.error-summary a {
    color: var(--coral-hover);
    font-weight: 700;
    text-decoration: none;
}

.login-link a:hover,
.context-panel a:hover,
.error-summary a:hover {
    text-decoration: underline;
}

.build-serial {
    color: var(--text-subtle);
    font-size: 11px;
    letter-spacing: 0.04em;
    margin-top: 18px;
    text-align: center;
}

.otp-input {
    font-size: 20px !important;
    letter-spacing: 0.35rem;
    text-align: center;
}

.icon {
    font-size: 46px;
    line-height: 1;
    margin-bottom: 14px;
}

.success {
    color: var(--green);
}

.error {
    color: var(--red);
}

@media (max-width: 640px) {
    body {
        padding: 16px;
    }

    .login-card,
    .card {
        padding: 24px;
    }

    .form-row {
        flex-direction: column;
        gap: 0;
    }
}