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

/* Light theme (default) */
:root {
    --bg-gradient-start: #f8f9fa;
    --bg-gradient-mid: #e9ecef;
    --bg-gradient-end: #dee2e6;
    --card-bg: rgba(255, 255, 255, 0.9);
    --card-border: rgba(0, 0, 0, 0.1);
    --card-shadow: rgba(0, 0, 0, 0.1);
    --text-primary: #1a1820;
    --text-secondary: rgba(0, 0, 0, 0.6);
    --text-muted: rgba(0, 0, 0, 0.4);
    --loading-bg: rgba(0, 0, 0, 0.05);
    --loading-border: rgba(0, 0, 0, 0.2);
    --loading-spinner: #1a1820;
    --error-bg: rgba(239, 68, 68, 0.1);
    --error-border: rgba(239, 68, 68, 0.3);
    --error-text: #dc2626;

    /* FirebaseUI variables */
    --fui-primary: #1a73e8;
    --fui-primary-hover: #1557b0;
    --fui-primary-surface: #ffffff;
    --fui-text: #202124;
    --fui-text-muted: #5f6368;
    --fui-background: #ffffff;
    --fui-border: #dadce0;
    --fui-input: #202124;
    --fui-error: #d93025;
    --fui-radius: 8px;
    --fui-radius-card: 8px;
}

/* Dark theme */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-gradient-start: #1a1820;
        --bg-gradient-mid: #222126;
        --bg-gradient-end: #2a2830;
        --card-bg: rgba(255, 255, 255, 0.05);
        --card-border: rgba(255, 255, 255, 0.1);
        --card-shadow: rgba(0, 0, 0, 0.4);
        --text-primary: #FFFFFF;
        --text-secondary: rgba(255, 255, 255, 0.6);
        --text-muted: rgba(255, 255, 255, 0.4);
        --loading-bg: rgba(255, 255, 255, 0.08);
        --loading-border: rgba(255, 255, 255, 0.2);
        --loading-spinner: #FFFFFF;
        --error-bg: rgba(239, 68, 68, 0.1);
        --error-border: rgba(239, 68, 68, 0.3);
        --error-text: #fca5a5;

        /* FirebaseUI dark theme variables */
        --fui-primary: #8ab4f8;
        --fui-primary-hover: #aecbfa;
        --fui-primary-surface: rgba(255, 255, 255, 0.05);
        --fui-text: rgba(255, 255, 255, 0.9);
        --fui-text-muted: rgba(255, 255, 255, 0.6);
        --fui-background: #2a2830;
        --fui-border: rgba(255, 255, 255, 0.2);
        --fui-input: rgba(255, 255, 255, 0.9);
        --fui-error: #f28b82;
    }
    /* SVG Icon Color Fix */
    button[data-provider-id="password"] .firebaseui-idp-icon {
        filter: none;
    }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-mid) 50%, var(--bg-gradient-end) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    transition: background 0.3s ease;
}

.login-container,
.logout-container {
    width: 100%;
    max-width: 420px;
}

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

.login-card,
.logout-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--card-border);
    box-shadow: 0 8px 32px var(--card-shadow);
    border-radius: 16px;
    padding: 40px 32px;
    transition: background 0.3s ease, border 0.3s ease, box-shadow 0.3s ease;
}

.logout-card {
    padding: 48px 32px;
}

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

h1 {
    color: var(--text-primary);
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 8px;
    transition: color 0.3s ease;
}

.logout-card h1 {
    margin-bottom: 12px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 14px;
    transition: color 0.3s ease;
}

.message {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.6;
    margin-bottom: 32px;
    transition: color 0.3s ease;
}

#firebaseui-auth-container {
    margin-top: 24px;
}

.loading-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 24px;
    background: var(--loading-bg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    transition: background 0.3s ease;
}

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--loading-border);
    border-top-color: var(--loading-spinner);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 200px;
}

.error-message {
    background: var(--error-bg);
    border: 1px solid var(--error-border);
    color: var(--error-text);
    padding: 12px 16px;
    border-radius: 12px;
    margin-bottom: 24px;
    font-size: 14px;
    text-align: center;
    transition: background 0.3s ease, border 0.3s ease, color 0.3s ease;
}

.info-text {
    text-align: center;
    color: var(--text-muted);
    font-size: 13px;
    margin-top: 24px;
    line-height: 1.6;
    transition: color 0.3s ease;
}

/* FirebaseUI Container Styling */
.firebaseui-container {
    background-color: transparent;
}

.firebaseui-card-header {
    padding: 0;
}

.firebaseui-card-content {
    padding: 0;
}

.firebaseui-card-actions {
    padding: 1em 0;
}

.firebaseui-email-sent {
    margin: 2em 0;
}

.firebaseui-title {
    text-align: center;
    color: var(--fui-text) !important;
}

.firebaseui-text,
.firebaseui-label {
    color: var(--fui-text) !important;
}

.firebaseui-info-bar {
    margin: 2em 0;
}

/* Material Design Components */
.mdl-card {
    box-shadow: none;
    background: transparent !important;
}

/* Unified Button Styling for all providers */
.firebaseui-idp-button,
.mdl-button--raised.mdl-button--colored,
.firebaseui-idp-google,
.firebaseui-idp-microsoft,
.firebaseui-idp-password {
    border-radius: 8px !important;
    border: 1px solid var(--fui-border) !important;
    background-color: var(--fui-background) !important;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1) !important;
    transition: all 0.2s ease !important;
    max-width: 100% !important;
}

.firebaseui-idp-button:hover,
.mdl-button--raised.mdl-button--colored:hover {
    background-color: var(--fui-primary-surface) !important;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15) !important;
}

.firebaseui-idp-button:active {
    transform: translateY(0);
}

.firebaseui-idp-text {
    color: var(--fui-text) !important;
    font-size: 14px !important;
    font-weight: 500 !important;
    text-transform: none !important;
}

/* Input Fields */
.firebaseui-input,
.mdl-textfield__input {
    color: var(--fui-input) !important;
    border-bottom-color: var(--fui-border) !important;
    background-color: transparent !important;
}

.firebaseui-input:focus,
.mdl-textfield__input:focus {
    border-bottom-color: var(--fui-primary) !important;
}

.mdl-textfield__label {
    color: var(--fui-text-muted) !important;
}

.mdl-textfield--floating-label.is-focused .mdl-textfield__label {
    color: var(--fui-primary) !important;
}

/* Links */
.firebaseui-link {
    color: var(--fui-primary) !important;
}

.firebaseui-link:hover {
    color: var(--fui-primary-hover) !important;
}

/* Error Messages */
.firebaseui-error {
    color: var(--fui-error) !important;
}

/* Submit/Action Buttons */
.firebaseui-id-submit,
.mdl-button--raised.mdl-button--colored {
    background-color: var(--fui-primary) !important;
    color: #ffffff !important;
}

.firebaseui-id-submit:hover,
.mdl-button--raised.mdl-button--colored:hover {
    background-color: var(--fui-primary-hover) !important;
}

button[data-provider-id="password"] .firebaseui-idp-icon {
    filter: invert(.75);
}