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

:root {
    --bg-primary: #0a0e14;
    --bg-secondary: #151a23;
    --bg-card: #1a1f2e;
    --bg-input: #222938;
    --green-primary: #00ff88;
    --green-secondary: #00cc6a;
    --green-glow: rgba(0, 255, 136, 0.3);
    --text-primary: #e6e8eb;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --border-color: #2d3748;
    --error-color: #ff4444;
    --error-glow: rgba(255, 68, 68, 0.3);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 50% 50%, rgba(0, 255, 136, 0.05) 0%, transparent 50%);
    animation: pulse 15s ease-in-out infinite;
    pointer-events: none;
    z-index: 0;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.container {
    max-width: 500px;
    width: 100%;
    position: relative;
    z-index: 1;
}

.card {
    background: var(--bg-card);
    border-radius: 24px;
    padding: 40px;
    box-shadow: 
        0 20px 60px rgba(0, 0, 0, 0.5),
        0 0 0 1px var(--border-color),
        0 0 40px rgba(0, 255, 136, 0.1);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: 
        0 25px 70px rgba(0, 0, 0, 0.6),
        0 0 0 1px var(--green-primary),
        0 0 60px rgba(0, 255, 136, 0.15);
}

.header {
    text-align: center;
    margin-bottom: 32px;
}

.logo-container {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--green-primary), var(--green-secondary));
    border-radius: 16px;
    margin-bottom: 16px;
    box-shadow: 0 8px 24px var(--green-glow);
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.logo {
    width: 32px;
    height: 32px;
    color: var(--bg-primary);
}

h1 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
    background: linear-gradient(135deg, var(--text-primary), var(--green-primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 400;
}

.input-group {
    margin-bottom: 24px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.input-group input {
    width: 100%;
    padding: 14px 16px;
    background: var(--bg-input);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 15px;
    font-family: inherit;
    transition: all 0.3s ease;
    outline: none;
}

.input-group input:focus {
    border-color: var(--green-primary);
    box-shadow: 0 0 0 4px var(--green-glow);
}

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

.input-hint {
    display: block;
    margin-top: 6px;
    font-size: 12px;
    color: var(--text-muted);
}

.btn-check {
    width: 100%;
    padding: 14px 24px;
    background: linear-gradient(135deg, var(--green-primary), var(--green-secondary));
    color: var(--bg-primary);
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 16px var(--green-glow);
}

.btn-check:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px var(--green-glow);
}

.btn-check:active {
    transform: translateY(0);
}

.btn-check.loading {
    pointer-events: none;
}

.btn-check.loading .btn-text {
    opacity: 0;
}

.btn-check.loading .btn-loader {
    opacity: 1;
}

.btn-text {
    transition: opacity 0.3s ease;
}

.btn-loader {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border: 3px solid var(--bg-primary);
    border-top-color: transparent;
    border-radius: 50%;
    opacity: 0;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

.result-container,
.error-container {
    animation: slideIn 0.4s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.icon-success {
    width: 32px;
    height: 32px;
    color: var(--green-primary);
    filter: drop-shadow(0 0 8px var(--green-glow));
}

.result-header h3 {
    font-size: 20px;
    font-weight: 600;
}

.code-display {
    background: var(--bg-input);
    border: 2px solid var(--green-primary);
    border-radius: 16px;
    padding: 24px;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    box-shadow: 0 0 24px var(--green-glow);
    animation: glow 2s ease-in-out infinite;
}

@keyframes glow {
    0%, 100% { box-shadow: 0 0 24px var(--green-glow); }
    50% { box-shadow: 0 0 32px var(--green-glow); }
}

.code-value {
    font-size: 36px;
    font-weight: 700;
    letter-spacing: 4px;
    color: var(--green-primary);
    font-family: 'Courier New', monospace;
    text-shadow: 0 0 16px var(--green-glow);
}

.btn-copy {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--green-primary);
    color: var(--bg-primary);
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.btn-copy:hover {
    background: var(--green-secondary);
    transform: scale(1.05);
}

.btn-copy svg {
    width: 18px;
    height: 18px;
}

.email-info {
    background: var(--bg-input);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 20px;
}

.info-row {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
}

.info-row:last-child {
    border-bottom: none;
}

.info-label {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 500;
}

.info-value {
    font-size: 13px;
    color: var(--text-primary);
    font-weight: 500;
    text-align: right;
}

.btn-reset {
    width: 100%;
    padding: 12px 24px;
    background: transparent;
    color: var(--text-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-reset:hover {
    border-color: var(--green-primary);
    color: var(--green-primary);
    background: rgba(0, 255, 136, 0.05);
}

.error-container {
    text-align: center;
}

.icon-error {
    width: 64px;
    height: 64px;
    color: var(--error-color);
    margin: 0 auto 16px;
    filter: drop-shadow(0 0 16px var(--error-glow));
}

.error-container h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--error-color);
}

.error-container p {
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.6;
}

.footer {
    text-align: center;
    margin-top: 24px;
    padding: 16px;
}

.footer p {
    font-size: 13px;
    color: var(--text-muted);
}

.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--green-primary);
    color: var(--bg-primary);
    padding: 14px 24px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 600;
    font-size: 14px;
    box-shadow: 0 8px 24px var(--green-glow);
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    z-index: 1000;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.toast svg {
    width: 20px;
    height: 20px;
}

@media (max-width: 600px) {
    .card {
        padding: 28px 24px;
    }

    h1 {
        font-size: 24px;
    }

    .code-value {
        font-size: 28px;
    }

    .code-display {
        flex-direction: column;
        text-align: center;
    }

    .btn-copy {
        width: 100%;
        justify-content: center;
    }
}