:root {
    --kba-bg-container: #FEFEFE;
    --kba-border: 1px solid #e0e0e0;
    --kba-bg-form: #f4f3ec;
    --kba-text-color: #161714;
    --kba-btn-bg: #161819;
    --kba-btn-text: #FEFEFE;
    --kba-radius-large: 24px;
    --kba-radius-medium: 16px;
    --kba-radius-small: 12px;
    
    /* بهبود یافته - انیمیشن‌های consistent */
    --kba-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --kba-transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --kba-transition-smooth: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    
    /* animation timing یکسان */
    --kba-animation-duration: 0.5s;
    --kba-animation-delay-base: 0.1s;
    --kba-animation-easing: cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    box-sizing: border-box;
}

.kba-hidden {
    display: none !important;
}

/* بهبود یافته - کاهش padding عمودی */
.kba-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 80vh; /* کاهش از 100vh */
    padding: 20px 16px; /* کاهش padding */
    background: #fefefe;
    position: relative;
    overflow: hidden;
}

.kba-form-wrapper {
    width: 100%;
    max-width: 400px;
    background: #fefefe !important;
    border-radius: var(--kba-radius-large);
    border: var(--kba-border);
    padding: 24px; /* کاهش از 32px 24px */
    position: relative;
    overflow: hidden;
    transform: translateY(0);
    transition: var(--kba-transition-smooth);
}

.kba-logo {
    text-align: center;
    margin-bottom: 24px; /* کاهش از 32px */
    opacity: 0;
    animation: kba-fade-in-up var(--kba-animation-duration) var(--kba-animation-easing) var(--kba-animation-delay-base) forwards;
}

.kba-logo img {
    max-width: 160px;
    height: auto;
    transition: var(--kba-transition);
}

.kba-title {
    font-size: 22px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 24px; /* کاهش از 32px */
    color: var(--kba-text-color);
    opacity: 0;
    animation: kba-fade-in-up var(--kba-animation-duration) var(--kba-animation-easing) calc(var(--kba-animation-delay-base) * 2) forwards;
    letter-spacing: -0.02em;
}

.kba-form {
    position: relative;
}

/* بهبود یافته - smooth transitions */
.kba-step {
    display: block;
    opacity: 1;
    transform: translateY(0);
    transition: var(--kba-transition-smooth);
}

.kba-step.kba-hidden {
    display: none;
}

/* انیمیشن ورود step جدید */
.kba-step:not(.kba-hidden) {
    animation: kba-step-enter var(--kba-animation-duration) var(--kba-animation-easing) forwards;
}

.kba-form-group {
    margin-bottom: 20px; /* کاهش از 24px */
    opacity: 0;
    animation: kba-fade-in-up var(--kba-animation-duration) var(--kba-animation-easing) calc(var(--kba-animation-delay-base) * 3) forwards;
}

.kba-form-group label {
    display: block;
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--kba-text-color);
    transition: var(--kba-transition);
}

.kba-form-group input[type="text"],
.kba-form-group input[type="tel"] {
    width: 100%;
    padding: 16px 20px;
    font-size: 16px;
    border: var(--kba-border);
    border-radius: var(--kba-radius-medium);
    background: var(--kba-bg-container);
    color: var(--kba-text-color);
    transition: var(--kba-transition);
    min-height: 56px;
    line-height: 1.4;
}

/* بهبود focus states */
.kba-form-group input[type="text"]:focus,
.kba-form-group input[type="tel"]:focus {
    outline: none;
    border-color: var(--kba-btn-bg);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(22, 24, 25, 0.08);
}

.kba-form-group input[type="tel"] {
    direction: ltr;
    text-align: left;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
}

/* بهبود error messages */
.kba-error-message {
    display: block;
    font-size: 14px;
    color: #d32f2f;
    margin-top: 8px;
    min-height: 20px;
    opacity: 0;
    transform: translateY(-4px);
    transition: var(--kba-transition-fast);
}

.kba-error-message:not(:empty) {
    opacity: 1;
    transform: translateY(0);
}

/* بهبود دکمه‌ها با haptic-ready states */
.kba-btn {
    width: 100%;
    padding: 16px 24px;
    font-size: 16px;
    font-weight: 600;
    border: none;
    border-radius: var(--kba-radius-medium);
    cursor: pointer;
    transition: var(--kba-transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    min-height: 56px;
    position: relative;
    overflow: hidden;
    text-decoration: none;
    opacity: 0;
    animation: kba-fade-in-up var(--kba-animation-duration) var(--kba-animation-easing) calc(var(--kba-animation-delay-base) * 4) forwards;
    /* آماده‌سازی برای haptic feedback */
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.kba-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
    transition: left 0.6s var(--kba-animation-easing);
}

.kba-btn:hover::before {
    left: 100%;
}

/* بهبود button states */
.kba-btn-primary {
    background-color: var(--kba-btn-bg);
    color: var(--kba-btn-text);
}

.kba-btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    filter: brightness(1.05);
    box-shadow: 0 8px 24px rgba(22, 24, 25, 0.12);
}

.kba-btn-primary:active:not(:disabled) {
    transform: translateY(0);
    transition: var(--kba-transition-fast);
}

.kba-btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.kba-btn-secondary {
    background-color: transparent;
    color: var(--kba-text-color);
    border: var(--kba-border);
}

.kba-btn-secondary:hover:not(:disabled) {
    background-color: rgba(22, 24, 25, 0.04);
    transform: translateY(-1px);
}

.kba-welcome-message {
    text-align: center;
    font-size: 17px;
    margin-bottom: 24px; /* کاهش از 32px */
    color: var(--kba-text-color);
    line-height: 1.5;
    opacity: 0;
    animation: kba-fade-in-up var(--kba-animation-duration) var(--kba-animation-easing) calc(var(--kba-animation-delay-base) * 2) forwards;
}

.kba-otp-message {
    text-align: center;
    font-size: 15px;
    margin-bottom: 22px; /* کاهش از 28px */
    color: var(--kba-text-color);
    line-height: 1.6;
    opacity: 0;
    animation: kba-fade-in-up var(--kba-animation-duration) var(--kba-animation-easing) calc(var(--kba-animation-delay-base) * 2) forwards;
}

/* بهبود OTP inputs برای auto-advance بهتر */
.kba-otp-inputs {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-bottom: 22px; /* کاهش از 28px */
    direction: ltr;
    opacity: 0;
    animation: kba-fade-in-up var(--kba-animation-duration) var(--kba-animation-easing) calc(var(--kba-animation-delay-base) * 3) forwards;
}

.kba-otp-input {
    width: 56px;
    height: 56px;
    text-align: center;
    font-size: 20px;
    font-weight: 700;
    border: var(--kba-border);
    border-radius: var(--kba-radius-small);
    background: var(--kba-bg-container);
    color: var(--kba-text-color);
    transition: var(--kba-transition);
    direction: ltr;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    /* بهبود برای auto-advance */
    caret-color: var(--kba-btn-bg);
}

.kba-otp-input:focus {
    outline: none;
    border-color: var(--kba-btn-bg);
    transform: scale(1.05);
    background: #fafafa;
    box-shadow: 0 4px 12px rgba(22, 24, 25, 0.08);
}

.kba-otp-input:not(:placeholder-shown) {
    border-color: var(--kba-btn-bg);
    background: #f8f9fa;
}

/* بهبود paste feedback */
.kba-otp-input.kba-paste-success {
    animation: kba-paste-success 0.3s var(--kba-animation-easing);
}

.kba-resend-wrapper {
    text-align: center;
    margin-top: 16px; /* کاهش از 20px */
    opacity: 0;
    animation: kba-fade-in-up var(--kba-animation-duration) var(--kba-animation-easing) calc(var(--kba-animation-delay-base) * 5) forwards;
}

.kba-btn-link {
    background: none;
    border: none;
    color: var(--kba-text-color);
    text-decoration: underline;
    cursor: pointer;
    padding: 8px 16px;
    font-size: 14px;
    opacity: 0.7;
    transition: var(--kba-transition);
    border-radius: var(--kba-radius-small);
}

.kba-btn-link:hover:not(:disabled) {
    opacity: 1;
    background: rgba(22, 24, 25, 0.04);
    text-decoration: none;
}

.kba-btn-link:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    text-decoration: none;
}

#kba-resend-timer {
    display: block;
    font-size: 13px;
    color: #666;
    margin-top: 8px;
    font-weight: 500;
}

/* بهبود loading overlay */
.kba-loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(254, 254, 254, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    border-radius: var(--kba-radius-large);
    backdrop-filter: blur(4px);
}

/* بهبود یافته GSAP spinner */
.kba-loading-spinner {
    width: 40px;
    height: 40px;
    position: relative;
    /* بهبود برای GSAP animation */
    will-change: transform;
}

.kba-loading-spinner::before,
.kba-loading-spinner::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    will-change: transform;
}

.kba-loading-spinner::before {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(22, 24, 25, 0.1);
}

.kba-loading-spinner::after {
    width: 40px;
    height: 40px;
    border: 3px solid transparent;
    border-top-color: var(--kba-btn-bg);
    border-right-color: var(--kba-btn-bg);
}

/* انیمیشن‌های بهبود یافته */
@keyframes kba-fade-in-up {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes kba-step-enter {
    from {
        opacity: 0;
        transform: translateX(-10px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes kba-paste-success {
    0% { background-color: var(--kba-bg-container); }
    50% { background-color: #e8f5e8; }
    100% { background-color: var(--kba-bg-container); }
}

.kba-icon {
    width: 20px;
    height: 20px;
    transition: var(--kba-transition);
}

.kba-btn:hover .kba-icon {
    transform: scale(1.1);
}

/* بهبود modal */
.kba-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
    animation: kba-fade-in 0.3s var(--kba-animation-easing);
    backdrop-filter: blur(4px);
}

.kba-modal.kba-hidden {
    display: none;
}

.kba-modal-content {
    background: var(--kba-bg-container);
    border-radius: var(--kba-radius-large);
    padding: 28px 20px; /* کاهش از 32px 24px */
    max-width: 380px;
    width: 100%;
    text-align: center;
    animation: kba-slide-up 0.4s var(--kba-animation-easing);
    border: var(--kba-border);
}

.kba-modal-content h3 {
    font-size: 20px;
    margin-bottom: 16px;
    color: var(--kba-text-color);
    font-weight: 700;
    letter-spacing: -0.01em;
}

.kba-modal-content p {
    font-size: 15px;
    line-height: 1.6;
    margin-bottom: 24px; /* کاهش از 28px */
    color: #555;
}

.kba-modal-content .kba-btn {
    margin-bottom: 12px;
    animation: none;
    opacity: 1;
}

@keyframes kba-fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes kba-slide-up {
    from {
        transform: translateY(40px) scale(0.95);
        opacity: 0;
    }
    to {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}

/* موبایل فرست - بهبود یافته */
@media (max-width: 480px) {
    .kba-container {
        padding: 16px 12px; /* کاهش بیشتر */
        align-items: flex-start;
        padding-top: 24px; /* کاهش از 40px */
        min-height: 90vh; /* کاهش از auto */
    }
    
    .kba-form-wrapper {
        padding: 20px 16px; /* کاهش از 28px 20px */
        border-radius: 20px;
    }
    
    .kba-logo {
        margin-bottom: 20px; /* کاهش */
    }
    
    .kba-logo img {
        max-width: 140px;
    }
    
    .kba-title {
        font-size: 20px;
        margin-bottom: 20px; /* کاهش از 28px */
    }
    
    .kba-otp-input {
        width: 52px;
        height: 52px;
        font-size: 18px;
    }
    
    .kba-otp-inputs {
        gap: 10px;
        margin-bottom: 20px; /* کاهش از 24px */
    }
    
    .kba-form-group {
        margin-bottom: 16px; /* کاهش از 20px */
    }
    
    .kba-form-group input[type="text"],
    .kba-form-group input[type="tel"] {
        font-size: 17px;
        padding: 14px 18px;
    }
    
    .kba-btn {
        font-size: 17px;
        min-height: 52px;
        padding: 14px 20px;
    }
    
    .kba-modal-content {
        padding: 24px 16px; /* کاهش از 28px 20px */
        margin: 20px 12px;
        border-radius: 20px;
    }
}

/* بهبود tablet */
@media (min-width: 481px) and (max-width: 768px) {
    .kba-container {
        padding: 24px 16px; /* کاهش */
        min-height: 85vh; /* کاهش */
    }
    
    .kba-form-wrapper {
        max-width: 440px;
        padding: 28px 24px; /* کاهش از 36px 28px */
    }
    
    .kba-otp-input {
        width: 60px;
        height: 60px;
        font-size: 22px;
    }
}

/* دسکتاپ - کاهش padding قابل توجه */
@media (min-width: 769px) {
    .kba-container {
        padding: 32px 16px; /* کاهش قابل توجه */
        min-height: 75vh; /* کاهش از auto */
    }
    
    .kba-form-wrapper {
        padding: 32px 28px; /* کاهش از 40px 32px */
    }
    
    .kba-form-wrapper:hover {
        transform: translateY(-2px);
        border-color: rgba(22, 24, 25, 0.1);
        box-shadow: 0 8px 32px rgba(22, 24, 25, 0.08);
    }
    
    .kba-btn {
        transition: var(--kba-transition);
    }
    
    .kba-btn:hover {
        transform: translateY(-2px);
    }
}

/* WooCommerce Integration */
#kba-woo-login-replacement {
    width: 100%;
    max-width: 100%;
}

#kba-woo-login-replacement .kba-container {
    min-height: auto;
    background: transparent;
    padding: 0;
}

#kba-woo-login-replacement .kba-form-wrapper {
    max-width: 100%;
    border: none;
    background: transparent;
    padding: 0;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --kba-border: 2px solid #000;
    }
    
    .kba-btn-primary {
        border: 2px solid transparent;
    }
    
    .kba-btn-secondary {
        border: 2px solid var(--kba-text-color);
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .kba-logo,
    .kba-title,
    .kba-form-group,
    .kba-btn,
    .kba-welcome-message,
    .kba-otp-message,
    .kba-otp-inputs,
    .kba-resend-wrapper {
        animation: none;
        opacity: 1;
    }
}