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

:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #2a2a2a;
    --accent: #00d4ff;
    --accent-hover: #00b8e6;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --error: #ff4444;
    --success: #44ff44;
    --warning: #ffaa00;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: #0a0a0a;
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        radial-gradient(4px 4px at 20% 30%, rgba(0, 212, 255, 0.4), transparent),
        radial-gradient(3px 3px at 60% 70%, rgba(0, 212, 255, 0.35), transparent),
        radial-gradient(3px 3px at 50% 50%, rgba(0, 212, 255, 0.45), transparent),
        radial-gradient(4px 4px at 80% 10%, rgba(0, 212, 255, 0.3), transparent),
        radial-gradient(3px 3px at 90% 40%, rgba(0, 212, 255, 0.35), transparent),
        radial-gradient(4px 4px at 33% 60%, rgba(0, 212, 255, 0.4), transparent),
        radial-gradient(3px 3px at 10% 80%, rgba(0, 212, 255, 0.3), transparent),
        radial-gradient(4px 4px at 70% 90%, rgba(0, 212, 255, 0.35), transparent),
        radial-gradient(3px 3px at 15% 50%, rgba(0, 212, 255, 0.3), transparent),
        radial-gradient(4px 4px at 75% 25%, rgba(0, 212, 255, 0.35), transparent),
        radial-gradient(3px 3px at 45% 85%, rgba(0, 212, 255, 0.4), transparent),
        radial-gradient(4px 4px at 25% 15%, rgba(0, 212, 255, 0.3), transparent);
    background-size: 200% 200%;
    background-position: 0% 0%, 100% 50%, 50% 100%, 0% 50%, 100% 100%, 50% 0%, 0% 100%, 100% 0%, 25% 75%, 75% 25%, 45% 55%, 55% 45%;
    animation: particleMove 15s ease-in-out infinite;
    pointer-events: none;
    z-index: 0;
}

@keyframes particleMove {
    0%, 100% {
        background-position: 0% 0%, 100% 50%, 50% 100%, 0% 50%, 100% 100%, 50% 0%, 0% 100%, 100% 0%;
    }
    50% {
        background-position: 100% 100%, 0% 50%, 50% 0%, 100% 50%, 0% 0%, 50% 100%, 100% 0%, 0% 100%;
    }
}

.container {
    width: 100%;
    max-width: 600px;
    position: relative;
    z-index: 1;
}

.main-content {
    background: var(--bg-secondary);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.logo-container {
    text-align: center;
    margin-bottom: 30px;
    min-height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.logo-mark {
    width: 44px;
    height: 44px;
    color: var(--accent);
    filter: drop-shadow(0 0 12px rgba(0, 212, 255, 0.5));
}

.logo-wordmark {
    font-size: 26px;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.step {
    display: none;
    animation: fadeIn 0.3s;
}

.step.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

h1 {
    font-size: 32px;
    margin-bottom: 10px;
    text-align: center;
    background: linear-gradient(135deg, var(--accent) 0%, #00a8cc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h2 {
    font-size: 24px;
    margin-bottom: 20px;
    text-align: center;
}

.subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 16px;
}

.warning {
    text-align: center;
    color: var(--warning);
    margin-bottom: 30px;
    font-size: 14px;
    padding: 10px;
    background: rgba(255, 170, 0, 0.1);
    border-radius: 8px;
    border: 1px solid rgba(255, 170, 0, 0.3);
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 14px;
}

.input {
    width: 100%;
    padding: 14px 18px;
    background: var(--bg-tertiary);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 16px;
    transition: all 0.3s;
    font-family: inherit;
}

.input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

.input::placeholder {
    color: var(--text-secondary);
}

.otp-input {
    text-align: center;
    font-size: 24px;
    letter-spacing: 8px;
    font-weight: bold;
}

.promo-input {
    text-align: center;
    font-size: 18px;
    letter-spacing: 4px;
    font-weight: 600;
    text-transform: uppercase;
}

.btn {
    width: 100%;
    padding: 14px;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    margin-top: 10px;
    font-family: inherit;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent) 0%, #00a8cc 100%);
    color: var(--bg-primary);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 212, 255, 0.3);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover:not(:disabled):not(.disabled) {
    background: var(--bg-secondary);
    border-color: var(--accent);
}

.btn-secondary:disabled,
.btn-secondary.disabled {
    opacity: 0.6;
    cursor: not-allowed;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-color: rgba(255, 255, 255, 0.05);
    position: relative;
    overflow: hidden;
}

.btn-secondary.disabled::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.1), transparent);
    animation: shimmer 2s infinite;
    border-radius: 12px;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.status-message {
    margin-top: 15px;
    padding: 12px;
    border-radius: 8px;
    text-align: center;
    font-size: 14px;
    display: none;
}

.status-message.show {
    display: block;
    animation: slideDown 0.3s;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to   { opacity: 1; transform: translateY(0); }
}

.status-message.success {
    background: rgba(68, 255, 68, 0.1);
    border: 1px solid var(--success);
    color: var(--success);
}

.status-message.error {
    background: rgba(255, 68, 68, 0.1);
    border: 1px solid var(--error);
    color: var(--error);
}

.status-message.info {
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid var(--accent);
    color: var(--accent);
}

#activation-result {
    text-align: center;
}

.success-container {
    padding: 20px 0;
}

.check-icon {
    width: 80px;
    height: 80px;
    position: relative;
    border-radius: 50%;
    box-sizing: content-box;
    border: 4px solid var(--success);
    margin: 0 auto 24px;
}

.check-icon::before,
.check-icon::after {
    content: '';
    height: 100px;
    position: absolute;
    background: var(--bg-secondary);
    transform: rotate(-45deg);
}

.check-icon::before {
    top: 3px;
    left: -2px;
    width: 30px;
    transform-origin: 100% 50%;
    border-radius: 100px 0 0 100px;
}

.check-icon::after {
    top: 0;
    left: 30px;
    width: 60px;
    transform-origin: 0 50%;
    border-radius: 0 100px 100px 0;
    animation: rotate-circle 4.25s ease-in;
}

.icon-line {
    height: 5px;
    background-color: var(--success);
    display: block;
    border-radius: 2px;
    position: absolute;
    z-index: 10;
}

.line-tip {
    top: 46px;
    left: 14px;
    width: 25px;
    transform: rotate(45deg);
    animation: icon-line-tip 0.75s;
}

.line-long {
    top: 38px;
    right: 8px;
    width: 47px;
    transform: rotate(-45deg);
    animation: icon-line-long 0.75s;
}

.icon-circle {
    top: -4px;
    left: -4px;
    z-index: 10;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    position: absolute;
    box-sizing: content-box;
    border: 4px solid rgba(68, 255, 68, 0.2);
}

.icon-fix {
    top: 8px;
    width: 5px;
    left: 26px;
    z-index: 1;
    height: 85px;
    position: absolute;
    transform: rotate(-45deg);
    background-color: var(--bg-secondary);
}

@keyframes icon-line-tip {
    0%   { width: 0;  left: 1px;  top: 19px; }
    54%  { width: 0;  left: 1px;  top: 19px; }
    70%  { width: 50px; left: -8px; top: 37px; }
    84%  { width: 17px; left: 21px; top: 48px; }
    100% { width: 25px; left: 14px; top: 46px; }
}

@keyframes icon-line-long {
    0%   { width: 0;  right: 46px; top: 54px; }
    65%  { width: 0;  right: 46px; top: 54px; }
    84%  { width: 55px; right: 0px;  top: 35px; }
    100% { width: 47px; right: 8px;  top: 38px; }
}

@keyframes rotate-circle {
    0%   { transform: rotate(-45deg); }
    5%   { transform: rotate(-45deg); }
    12%  { transform: rotate(-405deg); }
    100% { transform: rotate(-405deg); }
}

.success-title {
    font-size: 28px;
    margin-bottom: 15px;
    background: linear-gradient(135deg, var(--success) 0%, #2ecc71 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.success-message {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.6;
}

.payment-link-box {
    background: var(--bg-tertiary);
    border: 1px solid rgba(0, 212, 255, 0.25);
    border-radius: 12px;
    padding: 14px 16px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    gap: 8px;
    max-width: 100%;
}

.payment-link-box input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 13px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    outline: none;
    min-width: 0;
    text-overflow: ellipsis;
}

.payment-link-box .copy-btn {
    background: var(--accent);
    color: var(--bg-primary);
    border: none;
    border-radius: 8px;
    padding: 8px 14px;
    font-weight: 600;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
    flex-shrink: 0;
    font-family: inherit;
}

.payment-link-box .copy-btn:hover {
    background: var(--accent-hover);
}

.pay-btn {
    display: inline-block;
    width: 100%;
    background: linear-gradient(135deg, var(--accent) 0%, #00a8cc 100%);
    color: var(--bg-primary);
    padding: 14px 32px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(0, 212, 255, 0.3);
    margin-bottom: 12px;
    text-align: center;
}

.pay-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 212, 255, 0.4);
}

.restart-btn {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 12px;
    width: 100%;
    cursor: pointer;
    font-size: 14px;
    font-family: inherit;
    transition: all 0.2s;
}

.restart-btn:hover {
    color: var(--text-primary);
    border-color: rgba(255, 255, 255, 0.2);
}

.loading-container {
    text-align: center;
    padding: 40px 20px;
}

.spinner {
    border: 4px solid var(--bg-tertiary);
    border-top: 4px solid var(--accent);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    0%   { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.error-container {
    text-align: center;
    padding: 40px 20px;
}

.error-icon {
    font-size: 64px;
    margin-bottom: 20px;
}

.error-container h2 {
    color: var(--error);
    margin-bottom: 15px;
}

.error-container p {
    color: var(--text-secondary);
    white-space: pre-line;
    line-height: 1.6;
}

@media (max-width: 768px) {
    .main-content {
        padding: 30px 20px;
    }
    h1 { font-size: 24px; }
    .logo-wordmark { font-size: 22px; }
}