:root {
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --background: #0f172a;
    --card-bg: #1e293b;
    --text: #f8fafc;
    --text-secondary: #94a3b8;
    --success: #10b981;
    --error: #dc2626;
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--background);
    color: var(--text);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.container {
    background: var(--card-bg);
    padding: 30px;
    border-radius: var(--border-radius);
    width: 100%;
    max-width: 450px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.3);
    position: relative;
    overflow: hidden;
}

.logo {
    text-align: center;
    margin-bottom: 20px;
    color: var(--primary);
    font-size: 24px;
    font-weight: bold;
}

h2 {
    text-align: center;
    margin-bottom: 25px;
    color: var(--text);
    font-weight: 600;
}

.progress-bar {
    display: flex;
    justify-content: space-between;
    margin-bottom: 30px;
    position: relative;
}

.progress-bar::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 2px;
    background: #334155;
    transform: translateY(-50%);
    z-index: 1;
}

.progress-indicator {
    position: absolute;
    top: 50%;
    left: 0;
    height: 2px;
    background: var(--primary);
    transform: translateY(-50%);
    z-index: 2;
    transition: var(--transition);
    width: 0%;
}

.step {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: #334155;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 14px;
    position: relative;
    z-index: 3;
    transition: var(--transition);
}

.step.active {
    background: var(--primary);
    color: white;
}

.step-label {
    position: absolute;
    top: 35px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 12px;
    color: var(--text-secondary);
    white-space: nowrap;
}

.form-group {
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
}

label {
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text);
}

input[type="text"], input[type="email"], input[type="password"], input[type="number"] {
    padding: 12px 15px;
    border-radius: 8px;
    border: 1px solid #334155;
    background: #0f172a;
    color: var(--text);
    outline: none;
    font-size: 16px;
    transition: var(--transition);
}

input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

.otp-inputs {
    display: flex;
    gap: 10px;
    justify-content: space-between;
}

.otp-inputs input {
    width: 60px;
    height: 60px;
    text-align: center;
    font-size: 24px;
    border-radius: 8px;
    padding: 10px;
    font-weight: bold;
}

.btn {
    background: var(--primary);
    color: white;
    border: none;
    padding: 14px;
    width: 100%;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    margin-top: 10px;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

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

.btn-secondary {
    background: transparent;
    border: 1px solid #334155;
    color: var(--text-secondary);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.toggle-password {
    position: relative;
}

.toggle-password i {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
}

.toggle-password i:hover {
    color: var(--text);
}

.resend-btn {
    background: none;
    border: none;
    color: var(--primary);
    cursor: pointer;
    margin-top: 15px;
    font-size: 14px;
    text-decoration: underline;
    transition: var(--transition);
}

.resend-btn:hover {
    color: var(--primary-hover);
}

.resend-btn:disabled {
    color: var(--text-secondary);
    cursor: not-allowed;
}

.notification {
    padding: 12px 15px;
    border-radius: 8px;
    text-align: center;
    margin-bottom: 15px;
    display: none;
    animation: fadeIn 0.3s ease;
}

.success {
    background: var(--success);
}

.error {
    background: var(--error);
}

.info {
    background: var(--primary);
}

.login-link {
    text-align: center;
    margin-top: 25px;
    color: var(--text-secondary);
    font-size: 14px;
}

.login-link a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.login-link a:hover {
    text-decoration: underline;
}

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

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
    20%, 40%, 60%, 80% { transform: translateX(5px); }
}

.shake {
    animation: shake 0.5s ease;
}

.password-strength {
    margin-top: 5px;
    height: 4px;
    border-radius: 2px;
    background: #334155;
    overflow: hidden;
}

.password-strength-bar {
    height: 100%;
    width: 0%;
    transition: var(--transition);
}

.password-strength-text {
    font-size: 12px;
    margin-top: 5px;
    color: var(--text-secondary);
}

.step-content {
    transition: var(--transition);
}