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

body {
    font-family: 'Poppins', sans-serif;
    background: radial-gradient(ellipse at bottom, #0a0a0a 0%, #1a1a2e 100%);
    min-height: 100vh;
    padding: 20px;
    position: relative;
}

body::before {
    content: "🌙";
    position: fixed;
    font-size: 500px;
    opacity: 0.02;
    bottom: -150px;
    right: -150px;
    pointer-events: none;
    animation: floatMoon 20s ease-in-out infinite;
}

@keyframes floatMoon {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(-20px, -20px); }
}

.container {
    max-width: 600px;
    margin: 0 auto;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 20px;
}

.muzan-icon {
    font-size: 70px;
    animation: pulseMoon 2s ease-in-out infinite;
}

@keyframes pulseMoon {
    0%, 100% { transform: scale(1); text-shadow: 0 0 20px rgba(139,0,0,0.5); }
    50% { transform: scale(1.05); text-shadow: 0 0 40px rgba(139,0,0,0.8); }
}

h1 {
    font-size: 2.8rem;
    background: linear-gradient(135deg, #ff0000, #8b0000, #4a0000);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin: 10px 0;
    letter-spacing: 3px;
    font-weight: 800;
}

.subtitle {
    color: rgba(255,255,255,0.6);
    font-size: 0.9rem;
}

.catchphrase {
    color: #8b0000;
    font-size: 0.9rem;
    margin-top: 8px;
    font-style: italic;
}

/* Security Badge */
.security-badge {
    text-align: center;
    background: rgba(76, 175, 80, 0.1);
    border: 1px solid rgba(76, 175, 80, 0.3);
    border-radius: 20px;
    padding: 8px;
    font-size: 0.7rem;
    color: #4caf50;
    margin-bottom: 20px;
}

/* Form Card */
.form-card {
    background: rgba(0,0,0,0.7);
    backdrop-filter: blur(10px);
    border-radius: 30px;
    padding: 30px;
    border: 1px solid rgba(139,0,0,0.3);
    box-shadow: 0 20px 40px rgba(0,0,0,0.5);
}

/* Step Indicator */
.step-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 30px;
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    opacity: 0.4;
    transition: all 0.3s;
}

.step.active {
    opacity: 1;
}

.step-num {
    width: 35px;
    height: 35px;
    background: rgba(139,0,0,0.3);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 0.9rem;
}

.step.active .step-num {
    background: linear-gradient(135deg, #8b0000, #4a0000);
    color: white;
    box-shadow: 0 0 15px rgba(139,0,0,0.5);
}

.step-text {
    font-size: 0.7rem;
    color: rgba(255,255,255,0.7);
}

.step-line {
    width: 60px;
    height: 2px;
    background: rgba(139,0,0,0.3);
    margin: 0 15px;
}

/* Step Content */
.step-content {
    display: none;
    animation: fadeIn 0.5s ease;
}

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

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

/* Input Group */
.input-group {
    margin-bottom: 25px;
}

.input-group label {
    display: block;
    margin-bottom: 10px;
    color: #ff4444;
    font-weight: 500;
}

.phone-input {
    display: flex;
    gap: 10px;
}

.country-select {
    width: 120px;
    padding: 15px;
    background: rgba(0,0,0,0.5);
    border: 1px solid rgba(139,0,0,0.3);
    border-radius: 15px;
    color: white;
    font-size: 0.9rem;
    cursor: pointer;
}

.country-select option {
    background: #1a1a2e;
}

.phone-input input {
    flex: 1;
    background: rgba(0,0,0,0.5);
    border: 1px solid rgba(139,0,0,0.3);
    border-radius: 15px;
    padding: 15px;
    color: white;
    font-size: 1rem;
    outline: none;
    transition: all 0.3s;
}

.phone-input input:focus {
    border-color: #8b0000;
    box-shadow: 0 0 10px rgba(139,0,0,0.3);
}

small {
    display: block;
    margin-top: 8px;
    color: rgba(255,255,255,0.4);
    font-size: 0.7rem;
}

/* Buttons */
.btn-primary, .btn-secondary, .btn-reset, .btn-back {
    width: 100%;
    padding: 15px;
    border: none;
    border-radius: 15px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.btn-primary {
    background: linear-gradient(135deg, #8b0000, #4a0000);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(139,0,0,0.4);
}

.btn-secondary {
    background: rgba(139,0,0,0.3);
    color: white;
    margin-bottom: 10px;
}

.btn-secondary:hover {
    background: rgba(139,0,0,0.5);
}

.btn-back {
    background: transparent;
    color: rgba(255,255,255,0.6);
    border: 1px solid rgba(139,0,0,0.3);
}

.btn-back:hover {
    background: rgba(139,0,0,0.2);
}

.btn-reset {
    background: transparent;
    color: rgba(255,255,255,0.7);
    border: 1px solid rgba(139,0,0,0.3);
    margin-top: 20px;
}

.btn-reset:hover {
    background: rgba(139,0,0,0.2);
}

/* Pair Code Box */
.pair-code-box {
    text-align: center;
}

.code-label {
    color: #8b0000;
    font-size: 0.7rem;
    letter-spacing: 3px;
    margin-bottom: 15px;
}

.pair-code {
    font-size: 2.8rem;
    font-weight: bold;
    letter-spacing: 8px;
    background: linear-gradient(135deg, #ff0000, #8b0000);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-family: monospace;
    margin: 20px 0;
}

.countdown-timer {
    font-size: 0.8rem;
    color: #ff4444;
    margin: 15px 0;
}

.countdown-timer span {
    font-weight: bold;
    font-size: 1.2rem;
}

.code-instructions {
    text-align: left;
    background: rgba(0,0,0,0.5);
    padding: 20px;
    border-radius: 20px;
    margin-top: 20px;
}

.code-instructions p {
    color: #8b0000;
    margin-bottom: 15px;
    font-weight: bold;
}

.code-instructions ol {
    margin-left: 20px;
    color: rgba(255,255,255,0.8);
}

.code-instructions li {
    margin: 10px 0;
}

#displayCode {
    background: rgba(139,0,0,0.3);
    padding: 3px 10px;
    border-radius: 8px;
    font-family: monospace;
    font-size: 1rem;
}

/* Session Box */
.session-box {
    text-align: center;
}

.session-icon {
    font-size: 50px;
    margin-bottom: 15px;
}

.session-box h3 {
    color: #ff4444;
    margin-bottom: 10px;
}

.session-id-container {
    background: rgba(0,0,0,0.5);
    border-radius: 12px;
    padding: 15px;
    margin: 20px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
}

.session-id-container code {
    font-size: 0.7rem;
    word-break: break-all;
    color: #ff6666;
    flex: 1;
    font-family: monospace;
}

.copy-btn {
    background: rgba(139,0,0,0.3);
    border: none;
    padding: 8px 15px;
    border-radius: 8px;
    color: white;
    cursor: pointer;
    transition: all 0.3s;
}

.copy-btn:hover {
    background: rgba(139,0,0,0.5);
    transform: scale(1.05);
}

.success-animation {
    font-size: 40px;
    animation: bounce 0.5s ease;
}

@keyframes bounce {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.3); }
}

.warning-note {
    background: rgba(139,0,0,0.1);
    border-left: 3px solid #8b0000;
    padding: 12px;
    text-align: left;
    font-size: 0.75rem;
    margin: 15px 0;
    border-radius: 8px;
    color: rgba(255,255,255,0.7);
}

.next-steps {
    text-align: left;
    background: rgba(139,0,0,0.1);
    padding: 15px;
    border-radius: 12px;
}

.next-steps p {
    color: #ff6666;
    margin-bottom: 10px;
}

.next-steps ul {
    margin-left: 20px;
    color: rgba(255,255,255,0.7);
}

.next-steps li {
    margin: 8px 0;
    font-size: 0.85rem;
}

.next-steps code {
    background: rgba(0,0,0,0.5);
    padding: 2px 8px;
    border-radius: 5px;
    font-size: 0.75rem;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.9);
    backdrop-filter: blur(10px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.loading-content {
    text-align: center;
}

.loading-moon {
    font-size: 60px;
    animation: spinMoon 1s linear infinite;
}

@keyframes spinMoon {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.loading-content p {
    color: #ff6666;
    margin: 20px 0;
}

.loading-bar {
    width: 200px;
    height: 4px;
    background: rgba(139,0,0,0.3);
    border-radius: 4px;
    overflow: hidden;
}

.loading-progress {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, #8b0000, #ff0000);
    animation: loading 2s ease-in-out infinite;
}

@keyframes loading {
    0% { width: 0%; }
    50% { width: 100%; }
    100% { width: 0%; }
}

/* Footer */
.footer {
    text-align: center;
    margin-top: 30px;
}

.developer {
    margin: 10px 0;
    padding: 10px;
    border-top: 1px solid rgba(139,0,0,0.3);
    border-bottom: 1px solid rgba(139,0,0,0.3);
}

.dev-label {
    font-size: 0.7rem;
    color: rgba(255,255,255,0.4);
    margin-right: 8px;
}

.dev-name {
    font-size: 1rem;
    background: linear-gradient(135deg, #ffd700, #ff8c00);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-weight: bold;
}

.secure-badge {
    font-size: 0.7rem;
    color: rgba(255,255,255,0.4);
}

.version {
    font-size: 0.6rem;
    color: rgba(255,255,255,0.3);
    margin-top: 5px;
}

/* Responsive */
@media (max-width: 600px) {
    .form-card {
        padding: 20px;
    }
    
    .pair-code {
        font-size: 1.8rem;
        letter-spacing: 5px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .step-line {
        width: 30px;
    }
    
    .phone-input {
        flex-direction: column;
    }
    
    .country-select {
        width: 100%;
    }
}