:root {
    --primary-color: #ff6600;
    --primary-hover: #e65c00;
    --line: #e5e7eb;
    --muted: #6b7280;
    --bg: #f6f7fb;
    --card: #ffffff;
    --text: #111827;
    --ok: #065f46;
    --err: #b91c1c;
}

body {
    margin: 0;
    background: linear-gradient(135deg, #f7f8fc 0%, #eef2f7 100%);
    font-family: "Segoe UI", Arial, sans-serif;
    color: var(--text);
    min-height: 100vh;
}

.auth-container {
    max-width: 520px;
    width: calc(100% - 32px);
    margin: 48px auto;
    padding: 24px;
    background: var(--card);
    border-radius: 18px;
    border: 1px solid var(--line);
    box-shadow: 0 18px 45px rgba(17, 24, 39, 0.08);
    overflow: hidden;
}

.brand {
    text-align: center;
    margin-bottom: 14px;
}

.brand h2 {
    margin: 0;
    color: var(--primary-color);
    letter-spacing: 1px;
}

.brand p {
    margin: 6px 0 0;
    font-size: 13px;
    color: var(--muted);
}

.tab-buttons {
    display: flex;
    gap: 10px;
    margin: 14px 0 18px;
}

.tab-btn {
    flex: 1;
    padding: 11px;
    background: #eef1f6;
    border: 1px solid var(--line);
    border-radius: 12px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.2s ease;
}

.tab-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: #fff;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.form-group {
    margin-bottom: 14px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: bold;
    font-size: 13px;
    color: #374151;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 11px 12px;
    border: 1px solid var(--line);
    border-radius: 12px;
    box-sizing: border-box;
    outline: none;
    background: #f9fafb;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.form-group input:focus,
.form-group select:focus {
    border-color: rgba(255, 102, 0, 0.45);
    box-shadow: 0 0 0 4px rgba(255, 102, 0, 0.12);
}

.hint {
    margin-top: 6px;
    font-size: 12px;
    min-height: 16px;
}

.hint.ok {
    color: var(--ok);
}

.hint.err {
    color: var(--err);
}

.btn-primary {
    background: var(--primary-color);
    color: #fff;
    padding: 11px 16px;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    width: 100%;
    font-weight: bold;
    box-shadow: 0 12px 22px rgba(255, 102, 0, 0.18);
}

.btn-primary:hover {
    background: var(--primary-hover);
}

.oauth-divider {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 14px 0;
    color: var(--muted);
    font-size: 12px;
}

.oauth-divider::before,
.oauth-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--line);
}

.google-signin {
    display: flex;
    justify-content: center;
    width: 100%;
}

.btn-google {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    max-width: 100%;
    padding: 11px 16px;
    border-radius: 12px;
    border: 1px solid var(--line);
    background: #fff;
    color: #111827;
    font-weight: 700;
    text-decoration: none;
    box-shadow: 0 10px 20px rgba(17, 24, 39, 0.06);
    box-sizing: border-box;
    white-space: nowrap;
}

.btn-google:hover {
    background: #f9fafb;
}

.google-icon {
    width: 18px;
    height: 18px;
    display: inline-flex;
    flex: 0 0 18px;
}

.btn-google svg {
    width: 18px;
    height: 18px;
    display: block;
}

.alert {
    padding: 10px 12px;
    margin-bottom: 12px;
    border-radius: 12px;
    font-size: 13px;
    border: 1px solid transparent;
}

.alert-error {
    background: #fef2f2;
    color: #991b1b;
    border-color: #fecaca;
}

.alert-success {
    background: #ecfdf5;
    color: #065f46;
    border-color: #a7f3d0;
}

.small-link {
    text-align: center;
    margin-top: 12px;
    font-size: 13px;
}

.small-link a {
    color: var(--primary-color);
    text-decoration: none;
}

.small-link a:hover {
    text-decoration: underline;
}

/* OTP MODAL */
.otp-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, .45);
    display: none;
    align-items: center;
    justify-content: center;
    padding: 16px;
    z-index: 9999;
}

.otp-overlay.active {
    display: flex;
}

/* FORGOT PASSWORD MODAL */
.forgot-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.45);
    display: none;
    align-items: center;
    justify-content: center;
    padding: 16px;
    z-index: 9998;
}

.forgot-overlay.active {
    display: flex;
}

.forgot-modal {
    width: min(420px, 100%);
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 18px;
    box-shadow: 0 18px 50px rgba(0, 0, 0, 0.16);
}

.forgot-title {
    font-weight: bold;
    font-size: 16px;
    margin-bottom: 6px;
}

.forgot-desc {
    font-size: 13px;
    color: var(--muted);
    margin-bottom: 12px;
    line-height: 1.4;
}

.forgot-msg {
    font-size: 13px;
    margin-top: 10px;
    min-height: 18px;
}

.forgot-msg.ok {
    color: var(--ok);
}

.forgot-msg.err {
    color: var(--err);
}

.forgot-actions {
    margin-top: 12px;
}

.forgot-actions button {
    width: 100%;
    padding: 10px;
    border-radius: 12px;
    border: 1px solid var(--line);
    background: #fff;
    cursor: pointer;
    font-weight: bold;
}

.otp-modal {
    width: min(420px, 100%);
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 14px;
    box-shadow: 0 18px 50px rgba(0, 0, 0, 0.12);
}

.otp-title {
    font-weight: bold;
    font-size: 16px;
    margin-bottom: 6px;
}

.otp-desc {
    font-size: 13px;
    color: var(--muted);
    margin-bottom: 12px;
    line-height: 1.4;
}

.otp-row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 12px;
}

.otp-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 12px;
    border-radius: 12px;
    border: 1px solid var(--line);
    background: #fff;
    cursor: pointer;
    font-weight: bold;
}

.otp-btn:hover {
    background: #fafafa;
}

.otp-input {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 12px;
    font-size: 18px;
    letter-spacing: 8px;
    text-align: center;
}

.otp-actions {
    display: flex;
    gap: 10px;
    margin-top: 12px;
}

.otp-actions button {
    flex: 1;
    padding: 10px;
    border-radius: 12px;
    border: 1px solid var(--line);
    background: #fff;
    cursor: pointer;
    font-weight: bold;
}

.otp-actions button.primary {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: #fff;
}

.otp-msg {
    font-size: 13px;
    color: var(--muted);
    margin-top: 10px;
    min-height: 18px;
}

.otp-icons svg {
    width: 18px;
    height: 18px;
    display: block;
}

.otp-small {
    font-size: 12px;
    color: var(--muted);
    margin-top: 10px;
}

@media (max-width: 640px) {
    .auth-container {
        margin: 16px auto;
        padding: 14px;
        width: calc(100% - 20px);
        border-radius: 12px;
    }

    .tab-btn {
        padding: 10px;
        font-size: 18px;
    }

    .form-group input,
    .form-group select,
    .btn-primary {
        font-size: 16px;
    }

    .otp-actions {
        flex-direction: column;
    }
}