:root {
    --dtn-login-otp-size: 38px;
    --dtn-login-otp-gap: 6px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--dtn-font-family, Arial, Helvetica, sans-serif);
    color: var(--dtn-color-text, #333);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--dtn-color-page-bg, #F5F5F5);
    background-image:
        radial-gradient(circle at 0% 0%, var(--dtn-color-primary-soft, rgba(230, 92, 46, 0.12)) 0%, transparent 55%),
        radial-gradient(circle at 100% 100%, var(--dtn-color-primary-softer, rgba(230, 92, 46, 0.06)) 0%, transparent 50%);
}

#container {
    width: 100%;
    max-width: 480px;
    margin: 24px;
    padding: 36px 32px 32px;
    border-radius: var(--dtn-radius-lg, 12px);
    background-color: var(--dtn-color-surface, #ffffff);
    box-shadow: var(--dtn-shadow-strong, 0 10px 30px rgba(30, 24, 16, 0.08));
    border: 1px solid var(--dtn-color-border-warm, #ece3de);
}

#container > img {
    display: block;
    max-width: 160px;
    height: auto;
    margin: 0 auto 24px;
}

#container h1 {
    margin: 0 0 6px;
    font-size: 20px;
    font-weight: 700;
    text-align: center;
    color: var(--dtn-color-heading, #2c2724);
    letter-spacing: -0.01em;
}

#container > p {
    margin: 0 0 24px;
    font-size: 13.5px;
    color: var(--dtn-color-text-muted, #5f5a57);
    text-align: center;
    line-height: 1.55;
}

#container form {
    margin: 0;
}

.dtn-login-field {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin: 0 0 16px;
}

.dtn-login-field > label {
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--dtn-color-text-muted, #5f5a57);
}

.dtn-login-field > input.input {
    width: 100%;
    padding: 11px 14px;
    font-size: 15px;
    font-family: inherit;
    color: var(--dtn-color-heading, #2c2724);
    background: var(--dtn-color-surface, #ffffff);
    border: 1px solid var(--dtn-color-border, #dddddd);
    border-radius: var(--dtn-radius-sm, 6px);
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
    outline: none;
}

.dtn-login-field > input.input:hover {
    border-color: var(--dtn-color-border-hover, #bdbdbd);
}

.dtn-login-field > input.input:focus {
    border-color: var(--dtn-color-primary, #e65c2e);
    box-shadow: 0 0 0 3px var(--dtn-color-primary-focus, rgba(230, 92, 46, 0.14));
}

#container input[type=submit],
#container button[type=submit],
#container .dtn-login-button {
    display: block;
    width: 100%;
    margin-top: 8px;
    padding: 12px 16px;
    font-size: 15px;
    font-weight: 600;
    font-family: inherit;
    color: var(--dtn-color-primary-contrast, #ffffff);
    background: var(--dtn-color-primary, #e65c2e);
    border: none;
    border-radius: var(--dtn-radius-sm, 6px);
    cursor: pointer;
    transition: background-color 0.15s ease, transform 0.1s ease;
    letter-spacing: 0.01em;
}

#container input[type=submit]:hover,
#container button[type=submit]:hover,
#container .dtn-login-button:hover {
    background: var(--dtn-color-primary-hover, #d6480f);
}

#container input[type=submit]:active,
#container button[type=submit]:active,
#container .dtn-login-button:active {
    transform: translateY(1px);
}

#container .dtn-login-button {
    text-decoration: none;
    text-align: center;
}

.dtn-login-message {
    margin-top: 18px;
    padding: 11px 14px;
    border-radius: var(--dtn-radius-sm, 6px);
    background: var(--dtn-color-primary-softer, rgba(230, 92, 46, 0.06));
    border: 1px solid var(--dtn-color-primary-border-soft, rgba(230, 92, 46, 0.18));
    color: var(--dtn-color-heading, #2c2724);
    font-size: 13px;
    text-align: center;
    line-height: 1.5;
}

.dtn-login-message.is-error {
    background: rgba(199, 68, 45, 0.06);
    border-color: rgba(199, 68, 45, 0.22);
    color: var(--dtn-color-danger, #c7442d);
}

.dtn-login-info {
    text-align: center;
    margin: 18px 0 4px;
    font-size: 14px;
    color: var(--dtn-color-text, #333);
    line-height: 1.6;
}

.dtn-login-info b {
    color: var(--dtn-color-heading, #2c2724);
}

.dtn-login-info a {
    color: var(--dtn-color-primary, #e65c2e);
    font-weight: 600;
    text-decoration: none;
}

.dtn-login-info a:hover {
    text-decoration: underline;
}

.dtn-login-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 14px;
    border-radius: 50%;
    background: var(--dtn-color-primary-soft, rgba(230, 92, 46, 0.12));
    color: var(--dtn-color-primary, #e65c2e);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
}

/* ---------- OTP boxes ---------- */

.dtn-otp-field {
    margin: 0 0 18px;
}

.dtn-otp-label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--dtn-color-text-muted, #5f5a57);
    text-align: center;
    margin-bottom: 10px;
}

.dtn-otp-boxes {
    display: flex;
    gap: var(--dtn-login-otp-gap);
    justify-content: center;
    direction: ltr;
}

.dtn-otp-box {
    width: var(--dtn-login-otp-size);
    height: calc(var(--dtn-login-otp-size) + 6px);
    padding: 0;
    text-align: center;
    font-size: 20px;
    font-weight: 700;
    font-family: var(--dtn-font-family-mono, Consolas, "Courier New", monospace);
    color: var(--dtn-color-heading, #2c2724);
    background: var(--dtn-color-surface, #ffffff);
    border: 1.5px solid var(--dtn-color-border, #dddddd);
    border-radius: var(--dtn-radius-md, 8px);
    transition: border-color 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
    outline: none;
    -moz-appearance: textfield;
}

.dtn-otp-box::-webkit-outer-spin-button,
.dtn-otp-box::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.dtn-otp-box:hover {
    border-color: var(--dtn-color-border-hover, #bdbdbd);
}

.dtn-otp-box:focus {
    border-color: var(--dtn-color-primary, #e65c2e);
    background: var(--dtn-color-primary-softest, rgba(230, 92, 46, 0.05));
    box-shadow: 0 0 0 3px var(--dtn-color-primary-focus, rgba(230, 92, 46, 0.14));
}

.dtn-otp-box.is-filled {
    border-color: var(--dtn-color-primary-border-soft, rgba(230, 92, 46, 0.18));
    color: var(--dtn-color-primary, #e65c2e);
}

@media (max-width: 480px) {
    :root {
        --dtn-login-otp-size: 34px;
        --dtn-login-otp-gap: 5px;
    }

    #container {
        padding: 28px 18px 24px;
    }

    .dtn-otp-box {
        font-size: 18px;
    }
}