/**
 * OTP 2FA — giao diện đồng bộ html/2fa.html (scoped trong SPA #view-otp2fa).
 */
#view-otp2fa .twofa-surface {
    --tfa-bg-color: #020617;
    --tfa-surface-color: rgba(15, 23, 42, 0.6);
    --tfa-surface-border: rgba(255, 255, 255, 0.06);
    --tfa-text-primary: #ffffff;
    --tfa-text-secondary: #94a3b8;
    --tfa-accent-cyan: #06b6d4;
    --tfa-accent-cyan-glow: rgba(6, 182, 212, 0.4);
    --tfa-accent-purple: #a855f7;
    --tfa-accent-purple-glow: rgba(168, 85, 247, 0.3);
    --tfa-accent-warning: #eab308;
    --tfa-accent-danger: #ef4444;
    --tfa-font: "Plus Jakarta Sans", ui-sans-serif, system-ui, sans-serif;

    font-family: var(--tfa-font);
    background-color: var(--tfa-bg-color);
    color: var(--tfa-text-primary);
    /* min-height: calc(100vh - 120px); */
    display: flex;
    justify-content: center;
    align-items: flex-start;
    overflow: hidden;
    position: relative;
    padding-top: 1rem;
    padding-bottom: 3rem;
}

#view-otp2fa .twofa-surface,
#view-otp2fa .twofa-surface * {
    box-sizing: border-box;
}

#view-otp2fa .twofa-surface .tfa-ambient-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    z-index: 0;
    pointer-events: none;
}

#view-otp2fa .twofa-surface .tfa-glow-1 {
    top: -10%;
    left: 20%;
    width: 400px;
    height: 400px;
    background: var(--tfa-accent-cyan-glow);
}

#view-otp2fa .twofa-surface .tfa-glow-2 {
    bottom: -10%;
    right: 20%;
    width: 500px;
    height: 500px;
    background: var(--tfa-accent-purple-glow);
}

#view-otp2fa .twofa-surface .tfa-container {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 800px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

#view-otp2fa .twofa-surface .tfa-header {
    text-align: center;
    margin-bottom: 1rem;
}

#view-otp2fa .twofa-surface .tfa-badge {
    display: inline-block;
    background: rgba(234, 179, 8, 0.1);
    color: var(--tfa-accent-warning);
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 0.5rem 1rem;
    border-radius: 999px;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(234, 179, 8, 0.2);
}

#view-otp2fa .twofa-surface .tfa-title {
    font-size: 3.5rem;
    font-weight: 900;
    letter-spacing: -0.05em;
    margin-bottom: 1rem;
    text-shadow: 0 0 40px rgba(255, 255, 255, 0.2);
}

#view-otp2fa .twofa-surface .tfa-subtitle {
    color: var(--tfa-text-secondary);
    font-size: 1rem;
    font-weight: 400;
    max-width: 500px;
    margin: 0 auto;
    line-height: 1.6;
}

#view-otp2fa .twofa-surface .tfa-glass-panel {
    width: 100%;
    background: var(--tfa-surface-color);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--tfa-surface-border);
    border-radius: 32px;
    padding: 2rem;
    box-shadow: 0 24px 40px -12px rgba(0, 0, 0, 0.5);
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

#view-otp2fa .twofa-surface .tfa-glass-panel:hover {
    transform: translateY(-5px);
    box-shadow: 0 30px 50px -12px rgba(0, 0, 0, 0.6), 0 0 30px rgba(6, 182, 212, 0.1);
    border-color: rgba(6, 182, 212, 0.2);
}

#view-otp2fa .twofa-surface .tfa-input-group {
    margin-bottom: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

#view-otp2fa .twofa-surface .tfa-input-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--tfa-text-primary);
}

#view-otp2fa .twofa-surface .tfa-input-wrapper {
    position: relative;
    width: 100%;
}

#view-otp2fa .twofa-surface .tfa-input-field {
    width: 100%;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--tfa-text-primary);
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 1rem;
    padding: 1.25rem 1.5rem;
    border-radius: 999px;
    outline: none;
    transition: all 0.3s ease;
    letter-spacing: 0.05em;
}

#view-otp2fa .twofa-surface .tfa-input-field::placeholder {
    color: rgba(148, 163, 184, 0.5);
}

#view-otp2fa .twofa-surface .tfa-input-field:focus {
    border-color: var(--tfa-accent-cyan);
    box-shadow: 0 0 20px rgba(6, 182, 212, 0.2);
    background: rgba(0, 0, 0, 0.5);
}

#view-otp2fa .twofa-surface .tfa-panel-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

#view-otp2fa .twofa-surface .tfa-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    border-radius: 999px;
    font-weight: 600;
    font-size: 0.875rem;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    outline: none;
}

#view-otp2fa .twofa-surface .tfa-btn svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

#view-otp2fa .twofa-surface .tfa-btn-ghost {
    background: transparent;
    color: var(--tfa-text-secondary);
}

#view-otp2fa .twofa-surface .tfa-btn-ghost:hover {
    color: var(--tfa-text-primary);
    background: rgba(255, 255, 255, 0.05);
}

#view-otp2fa .twofa-surface .tfa-btn-outline {
    background: transparent;
    color: var(--tfa-text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

#view-otp2fa .twofa-surface .tfa-btn-outline:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.2);
}

#view-otp2fa .twofa-surface .tfa-hr {
    border: none;
    border-top: 1px solid var(--tfa-surface-border);
    margin: 2rem 0;
}

#view-otp2fa .twofa-surface .tfa-otp-display-box {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.04);
    border-radius: 24px;
    padding: 3rem 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

#view-otp2fa .twofa-surface .tfa-otp-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--tfa-text-secondary);
    font-weight: 800;
    margin-bottom: 1rem;
}

#view-otp2fa .twofa-surface .tfa-otp-value {
    font-size: 4.5rem;
    font-weight: 900;
    letter-spacing: 0.15em;
    color: var(--tfa-text-primary);
    font-variant-numeric: tabular-nums;
    margin-bottom: 1rem;
    text-shadow: 0 0 30px var(--tfa-accent-cyan-glow);
    transition: opacity 0.2s ease;
}

#view-otp2fa .twofa-surface .tfa-otp-value.tfa-is-dimmed {
    opacity: 0.3;
    text-shadow: none;
}

#view-otp2fa .twofa-surface .tfa-timer-wrap {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--tfa-text-secondary);
    font-size: 0.875rem;
    margin-bottom: 2rem;
}

#view-otp2fa .twofa-surface .tfa-timer-text span {
    color: var(--tfa-accent-warning);
    font-weight: 800;
    font-variant-numeric: tabular-nums;
}

#view-otp2fa .twofa-surface .tfa-timer-text.tfa-danger span {
    color: var(--tfa-accent-danger);
    animation: tfa-pulse-text 1s infinite;
}

@keyframes tfa-pulse-text {
    0%,
    100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

#view-otp2fa .twofa-surface .tfa-progress-bar-bg {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.05);
}

#view-otp2fa .twofa-surface .tfa-progress-bar-fill {
    height: 100%;
    width: 100%;
    background: var(--tfa-accent-cyan);
    box-shadow: 0 0 10px var(--tfa-accent-cyan);
    transition: width 0.1s linear, background-color 0.3s ease;
}

#view-otp2fa .twofa-surface .tfa-progress-bar-fill.tfa-danger {
    background: var(--tfa-accent-danger);
    box-shadow: 0 0 10px var(--tfa-accent-danger);
}

/* Nội dung SEO (đồng bộ html/2fa.html .seo-content) */
#view-otp2fa .twofa-surface .tfa-seo-content {
    width: 100%;
    /* background: rgba(15, 23, 42, 0.4); */
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    /* border: 1px solid var(--tfa-surface-border); */
    /* border-radius: 32px; */
    /* padding: 3rem; */
    color: var(--tfa-text-secondary);
    line-height: 1.8;
    font-size: 1rem;
}

#view-otp2fa .twofa-surface .tfa-seo-content h2,
#view-otp2fa .twofa-surface .tfa-seo-content h3 {
    color: var(--tfa-text-primary);
    font-weight: 800;
    letter-spacing: -0.02em;
}

#view-otp2fa .twofa-surface .tfa-seo-content h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    background: linear-gradient(to right, #ffffff, var(--tfa-accent-cyan));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

#view-otp2fa .twofa-surface .tfa-seo-content h3 {
    font-size: 1.25rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

#view-otp2fa .twofa-surface .tfa-seo-content h3::before {
    content: "";
    display: block;
    width: 8px;
    height: 24px;
    background: var(--tfa-accent-cyan);
    border-radius: 4px;
    flex-shrink: 0;
}

#view-otp2fa .twofa-surface .tfa-seo-content p {
    margin-bottom: 1.25rem;
}

#view-otp2fa .twofa-surface .tfa-seo-content ul,
#view-otp2fa .twofa-surface .tfa-seo-content ol {
    padding-left: 1.5rem;
    margin-bottom: 1.5rem;
}

#view-otp2fa .twofa-surface .tfa-seo-content li {
    margin-bottom: 0.75rem;
}

#view-otp2fa .twofa-surface .tfa-seo-content li::marker {
    color: var(--tfa-accent-cyan);
}

#view-otp2fa .twofa-surface .tfa-seo-content strong {
    color: var(--tfa-text-primary);
    font-weight: 600;
}

#view-otp2fa .twofa-surface .tfa-seo-content code {
    background: rgba(255, 255, 255, 0.06);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.9em;
    color: var(--tfa-accent-cyan);
}

#view-otp2fa .twofa-surface .tfa-toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: rgba(16, 185, 129, 0.2);
    border: 1px solid rgba(16, 185, 129, 0.5);
    color: #10b981;
    padding: 0.75rem 1.5rem;
    border-radius: 999px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    font-weight: 600;
    font-size: 0.875rem;
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    z-index: 100;
    pointer-events: none;
}

#view-otp2fa .twofa-surface .tfa-toast.tfa-toast--show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

@media (max-width: 640px) {
    #view-otp2fa .twofa-surface .tfa-title {
        font-size: 2.5rem;
    }

    #view-otp2fa .twofa-surface .tfa-glass-panel {
        padding: 1.5rem;
        border-radius: 24px;
    }

    #view-otp2fa .twofa-surface .tfa-otp-value {
        font-size: 3rem;
    }

    #view-otp2fa .twofa-surface .tfa-panel-actions {
        flex-wrap: wrap;
    }

    #view-otp2fa .twofa-surface .tfa-input-field {
        font-size: 0.875rem;
        padding: 1rem 1.25rem;
    }

    #view-otp2fa .twofa-surface .tfa-seo-content {
        padding: 1.5rem;
        border-radius: 24px;
    }

    #view-otp2fa .twofa-surface .tfa-seo-content h2 {
        font-size: 1.5rem;
    }
}