* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Google Sans', 'Roboto', Arial, sans-serif;
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
}

:root {
    /* Google's Material Design 3 Colors */
    --google-blue: #1a73e8;
    --google-blue-hover: #1557b0;
    --google-blue-active: #174ea6;
    --google-red: #ea4335;
    --google-yellow: #fbbc05;
    --google-green: #34a853;
    --text-primary: #202124;
    --text-secondary: #5f6368;
    --border-color: #dadce0;
    --background-color: #fff;
    --error-color: #d93025;
    --success-color: #188038;
    --container-padding: clamp(16px, 5vw, 40px);
    --container-max-width: min(450px, 90vw);
    --input-height: 56px;
    --input-border-radius: 4px;
    --button-height: 48px;
    --button-border-radius: 4px;
    --container-border-radius: 8px;
    --container-shadow: 0 2px 6px rgba(60,64,67,.15), 0 1px 2px rgba(60,64,67,.3);
}

html, body {
    height: 100%;
    width: 100%;
    overflow-x: hidden;
}

html {
    font-size: 16px;
}

body {
    min-height: 100vh;
    min-height: -webkit-fill-available;
    background-color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--container-padding);
    color: var(--text-primary);
    padding-top: max(env(safe-area-inset-top), var(--container-padding));
    padding-bottom: max(env(safe-area-inset-bottom), var(--container-padding));
    padding-left: max(env(safe-area-inset-left), var(--container-padding));
    padding-right: max(env(safe-area-inset-right), var(--container-padding));
}

.container {
    width: 100%;
    max-width: var(--container-max-width);
    position: relative;
    z-index: 1;
    margin: auto;
    padding: 0;
}

.login-container {
    width: 100%;
    background: #fff;
    border-radius: var(--container-border-radius);
    box-shadow: var(--container-shadow);
    overflow: hidden;
    animation: fadeSlideIn 0.3s ease-out;
    padding: 48px 40px 36px;
    transition: .3s;
}

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

/* Brand Header */
.brand-header {
    text-align: center;
    position: relative;
    overflow: hidden;
    margin-bottom: 24px;
}

.brand-header img {
    max-width: 100px;
    height: auto;
    margin: 0 auto;
    display: block;
}

/* Form Elements */
.form-control {
    width: 100%;
    height: var(--input-height);
    padding: 13px 15px;
    border: 1px solid var(--border-color);
    border-radius: var(--input-border-radius);
    background-color: #fff;
    font-size: 16px;
    transition: all 0.2s ease;
    -webkit-appearance: none;
    appearance: none;
    color: var(--text-primary);
}

.form-control:focus {
    border-color: var(--google-blue);
    box-shadow: 0 0 0 2px rgba(26,115,232,.2);
    outline: 0;
}

.form-control::placeholder {
    color: var(--text-secondary);
    font-size: 14px;
}

.form-control.error {
    border-color: var(--error-color);
}

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

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

.error-message {
    color: var(--error-color);
    font-size: 12px;
    margin-top: 4px;
    display: none;
}

/* Input Icon */
.input-icon {
    position: relative;
}

.input-icon i {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    font-size: 18px;
}

.input-icon input {
    padding-left: 40px;
}

/* Submit Button */
.submit-btn {
    width: 100%;
    height: var(--button-height);
    background-color: var(--google-blue);
    color: #fff;
    border: none;
    border-radius: var(--button-border-radius);
    font-weight: 500;
    font-size: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    cursor: pointer;
    margin-top: 32px;
    transition: all 0.2s ease;
    -webkit-tap-highlight-color: transparent;
    font-family: 'Google Sans', 'Roboto', Arial, sans-serif;
}

.submit-btn:hover {
    background-color: var(--google-blue-hover);
    box-shadow: 0 1px 2px rgba(60,64,67,.3), 0 1px 3px 1px rgba(60,64,67,.15);
}

.submit-btn:active {
    background-color: var(--google-blue-active);
    transform: scale(0.98);
}

/* Loading State */
.loading {
    position: relative;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    top: 50%;
    left: 50%;
    margin: -10px 0 0 -10px;
    border: 2px solid rgba(255,255,255,.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: .8s linear infinite spin;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* OTP Section */
.otp-section {
    display: none;
    opacity: 0;
    transition: .3s ease-in-out;
}

.otp-section.show {
    display: block;
    opacity: 1;
}

.phone-section.hide {
    display: none;
}

#otp-message {
    margin-top: 16px;
    padding: 12px 16px;
    border-radius: 4px;
    text-align: center;
    transition: .3s;
    font-size: 14px;
    line-height: 1.4;
    background-color: #fff;
}

/* Form Header */
.form-header {
    text-align: center;
    margin-bottom: 32px;
}

.form-header h2 {
    color: var(--text-primary);
    font-size: 24px;
    font-weight: 400;
    margin-bottom: 8px;
    font-family: 'Google Sans', 'Roboto', Arial, sans-serif;
}

.form-header p {
    color: var(--text-secondary);
    font-size: 16px;
    line-height: 1.4;
    font-family: 'Roboto', Arial, sans-serif;
}

/* Responsive Design */
@media (max-width: 576px) {
    .login-container {
        padding: 24px 20px;
        box-shadow: none;
        border: 1px solid var(--border-color);
        background-color: #fff;
    }

    .brand-header img {
        max-width: 100px;
    }

    .form-header h2 {
        font-size: 20px;
    }

    .form-control {
        height: 48px;
        font-size: 14px;
        background-color: #fff;
    }

    .submit-btn {
        height: 40px;
        font-size: 14px;
    }
}

/* Landscape Mode */
@media (max-height: 600px) and (orientation: landscape) {
    body {
        align-items: flex-start;
        padding-top: 20px;
        background-color: #fff;
    }

    .login-container {
        padding: 24px;
        background-color: #fff;
    }

    .brand-header {
        margin-bottom: 16px;
    }

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

    .submit-btn {
        margin-top: 24px;
    }
}

/* Touch Device Optimizations */
@media (hover: none) {
    .submit-btn:hover {
        background-color: var(--google-blue);
        box-shadow: none;
    }

    .submit-btn:active {
        background-color: var(--google-blue-active);
        transform: scale(0.98);
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}