body {
    background:
        radial-gradient(circle at top, rgba(108, 99, 255, 0.18), transparent 35%),
        #0d0d0d;
    margin: 0;
    font-family: Arial, sans-serif;
    color: white;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    box-sizing: border-box;
}

.captcha-shell {
    width: 100%;
    max-width: 1100px;
}

.captcha-card,
.success-screen {
    background: linear-gradient(180deg, #111116 0%, #161622 100%);
    border: 1px solid #2a2a3e;
    border-radius: 24px;
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.28);
    padding: 30px;
}

.captcha-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    border-radius: 999px;
    background: rgba(108, 99, 255, 0.14);
    border: 1px solid rgba(108, 99, 255, 0.28);
    color: #9d97ff;
    font-size: 13px;
    font-weight: bold;
    margin-bottom: 18px;
}

.captcha-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 24px;
    margin-bottom: 18px;
}

.captcha-title {
    margin: 0 0 10px;
    font-size: 34px;
    font-weight: 800;
}

.captcha-subtitle {
    margin: 0;
    color: #c1c1cf;
    font-size: 16px;
    line-height: 1.7;
    max-width: 700px;
}

.captcha-target {
    min-width: 240px;
    background-color: #1a1a24;
    border: 1px solid #2a2a3e;
    border-radius: 18px;
    padding: 18px;
}

.captcha-target span {
    display: block;
    color: #8f8fa8;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 8px;
}

.captcha-target strong {
    font-size: 22px;
    color: #8f88ff;
}

.captcha-stats {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    margin-bottom: 18px;
    flex-wrap: wrap;
}

.captcha-attempts {
    background-color: #171b28;
    border: 1px solid #283049;
    border-radius: 14px;
    padding: 12px 16px;
}

.captcha-attempts span {
    display: block;
    color: #99a0bc;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 6px;
}

.captcha-attempts strong {
    font-size: 22px;
    color: #ffffff;
}

.captcha-reset,
.captcha-secondary-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 18px;
    border-radius: 12px;
    text-decoration: none;
    color: white;
    background-color: #2a314a;
    border: 1px solid #3d4767;
    transition: transform 0.2s ease, background-color 0.2s ease;
}

.captcha-reset:hover,
.captcha-secondary-button:hover {
    background-color: #394362;
    transform: translateY(-1px);
}

.captcha-error {
    margin-bottom: 18px;
    background-color: rgba(161, 44, 47, 0.15);
    border: 1px solid rgba(255, 84, 84, 0.45);
    border-radius: 12px;
    color: #ffb8bb;
    padding: 14px 16px;
    font-size: 14px;
}

.mailbox {
    background-color: #0f1118;
    border: 1px solid #22263a;
    border-radius: 20px;
    overflow: hidden;
}

.mailbox-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 16px 20px;
    background-color: #141825;
    border-bottom: 1px solid #22263a;
}

.mailbox-dots {
    display: flex;
    gap: 8px;
}

.mailbox-dots span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: block;
}

.mailbox-dots span:nth-child(1) {
    background-color: #ff5f57;
}

.mailbox-dots span:nth-child(2) {
    background-color: #febc2e;
}

.mailbox-dots span:nth-child(3) {
    background-color: #28c840;
}

.mailbox-label {
    color: #d6daf0;
    font-size: 14px;
    font-weight: bold;
}

.mail-list {
    display: flex;
    flex-direction: column;
}

.mail-option {
    position: relative;
}

.mail-option-disabled {
    pointer-events: none;
}

.mail-option input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.mail-row {
    display: grid;
    grid-template-columns: 48px minmax(120px, 220px) 1fr 70px;
    gap: 14px;
    align-items: center;
    padding: 16px 18px;
    border-bottom: 1px solid #1d2234;
    cursor: pointer;
    transition:
        background-color 0.2s ease,
        border-color 0.2s ease,
        transform 0.2s ease,
        box-shadow 0.2s ease;
}

.mail-row:hover {
    background-color: #161b2a;
    transform: translateX(2px);
}

.mail-option input:checked + .mail-row {
    background-color: rgba(108, 99, 255, 0.14);
    box-shadow: inset 0 0 0 1px rgba(108, 99, 255, 0.35);
}

.mail-avatar {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: linear-gradient(180deg, #2f3550 0%, #1f2334 100%);
    border: 1px solid #303650;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #d7dcf2;
    font-weight: bold;
    font-size: 15px;
}

.mail-sender {
    font-weight: bold;
    color: white;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.mail-content {
    min-width: 0;
}

.mail-subject {
    color: #f3f4fb;
    font-size: 15px;
    margin-bottom: 4px;
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.mail-preview {
    color: #b5b8ca;
    font-size: 13px;
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.mail-time {
    color: #8f8fa8;
    font-size: 13px;
    text-align: right;
}

.captcha-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    margin-top: 24px;
}

.captcha-note {
    color: #b7bbcd;
    font-size: 14px;
    line-height: 1.6;
    max-width: 720px;
}

.captcha-actions {
    display: flex;
    gap: 12px;
}

.captcha-submit {
    background: linear-gradient(180deg, #7a72ff 0%, #5e56eb 100%);
    color: white;
    border: none;
    border-radius: 12px;
    padding: 14px 24px;
    font-size: 15px;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 12px 24px rgba(94, 86, 235, 0.28);
}

.captcha-submit:hover {
    transform: translateY(-1px) scale(1.01);
    box-shadow: 0 16px 30px rgba(94, 86, 235, 0.34);
}

.success-mode {
    overflow: hidden;
}

.success-screen {
    text-align: center;
    position: relative;
    overflow: hidden;
    animation: successPop 0.6s ease;
}

.success-icon {
    font-size: 68px;
    margin-bottom: 14px;
    animation: bounceIn 0.9s ease;
}

.success-screen h1 {
    margin: 0 0 12px;
    font-size: 40px;
}

.success-screen p {
    margin: 0 auto 24px;
    max-width: 520px;
    color: #ced2e6;
    font-size: 18px;
}

.success-loader {
    width: 240px;
    height: 10px;
    margin: 0 auto;
    background: #23283d;
    border-radius: 999px;
    overflow: hidden;
    border: 1px solid #323a5b;
}

.success-loader span {
    display: block;
    height: 100%;
    width: 0;
    background: linear-gradient(90deg, #62d26f 0%, #9cffaf 100%);
    animation: loadingBar 1.8s linear forwards;
}

.success-burst {
    position: absolute;
    inset: 0;
    pointer-events: none;
    background:
        radial-gradient(circle at 20% 30%, rgba(255, 215, 0, 0.25), transparent 18%),
        radial-gradient(circle at 80% 20%, rgba(98, 210, 111, 0.22), transparent 18%),
        radial-gradient(circle at 30% 80%, rgba(122, 114, 255, 0.2), transparent 20%),
        radial-gradient(circle at 75% 70%, rgba(255, 105, 180, 0.16), transparent 18%);
    animation: burstPulse 1s ease-in-out infinite alternate;
}

@keyframes successPop {
    from {
        opacity: 0;
        transform: scale(0.96);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: scale(0.3) translateY(20px);
    }
    60% {
        opacity: 1;
        transform: scale(1.08) translateY(-6px);
    }
    100% {
        transform: scale(1) translateY(0);
    }
}

@keyframes loadingBar {
    from {
        width: 0;
    }
    to {
        width: 100%;
    }
}

@keyframes burstPulse {
    from {
        opacity: 0.7;
        transform: scale(1);
    }
    to {
        opacity: 1;
        transform: scale(1.03);
    }
}

@media (max-width: 900px) {
    .captcha-top {
        flex-direction: column;
    }

    .captcha-target {
        width: 100%;
        min-width: 0;
    }

    .mail-row {
        grid-template-columns: 42px 1fr 56px;
    }

    .mail-sender {
        display: none;
    }

    .captcha-footer {
        flex-direction: column;
        align-items: stretch;
    }

    .captcha-actions {
        width: 100%;
    }

    .captcha-submit,
    .captcha-secondary-button {
        width: 100%;
    }
}

@media (max-width: 640px) {
    body {
        padding: 14px;
    }

    .captcha-card,
    .success-screen {
        padding: 20px;
        border-radius: 18px;
    }

    .captcha-title {
        font-size: 28px;
    }

    .mailbox-toolbar {
        padding: 14px 16px;
    }

    .mail-row {
        grid-template-columns: 36px 1fr;
        gap: 10px;
        padding: 14px 14px;
    }

    .mail-time {
        grid-column: 2;
        text-align: left;
        margin-top: 4px;
    }

    .success-screen h1 {
        font-size: 30px;
    }

    .success-screen p {
        font-size: 16px;
    }

    .success-loader {
        width: 100%;
    }
}