/* Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    /* Touch-friendly tap targets */
    -webkit-tap-highlight-color: rgba(16, 185, 129, 0.2);
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    /* Prevent text size adjust on mobile */
    -webkit-text-size-adjust: 100%;
    -moz-text-size-adjust: 100%;
    text-size-adjust: 100%;
    /* Smooth resize on orientation change */
    height: 100%;
}

body {
    font-family: var(--font-family);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    /* Smooth scrolling for mobile */
    -webkit-overflow-scrolling: touch;
    /* Prevent pull-to-refresh on mobile */
    overscroll-behavior-y: contain;
}

/* Background Gradient - Green & White Theme */
.background-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        135deg,
        #ffffff 0%,
        #f0fdf4 50%,
        #ffffff 100%
    );
    z-index: var(--z-background);
}

.background-gradient::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(
        circle at 20% 50%,
        rgba(16, 185, 129, 0.08) 0%,
        transparent 50%
    ),
    radial-gradient(
        circle at 80% 80%,
        rgba(16, 185, 129, 0.05) 0%,
        transparent 50%
    );
}

/* Utility Classes */
.hidden {
    display: none !important;
}

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

.text-muted {
    color: var(--color-text-muted);
}

/* Buttons */
.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 1.125rem 2.5rem;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-lg);
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: 0 8px 24px rgba(16, 185, 129, 0.35), 0 4px 8px rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, transparent 0%, rgba(255, 255, 255, 0.2) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(16, 185, 129, 0.4), 0 6px 12px rgba(0, 0, 0, 0.15);
}

.btn-primary:hover::before {
    opacity: 1;
}

.btn-primary:active {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.35), 0 3px 6px rgba(0, 0, 0, 0.1);
}

.btn-primary svg {
    flex-shrink: 0;
}

.btn-control {
    padding: 0.75rem 1.5rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-size: var(--font-size-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    backdrop-filter: blur(10px);
    min-height: 44px; /* Touch-friendly minimum */
}

.btn-control:hover {
    background: var(--color-surface-hover);
    border-color: rgba(255, 255, 255, 0.2);
}

.btn-clear {
    padding: 0.5rem 1rem;
    background: transparent;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-clear:hover {
    background: var(--color-surface);
    color: var(--color-text);
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-overlay);
    backdrop-filter: blur(5px);
}

.loading-content {
    text-align: center;
    max-width: 300px;
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--glass-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

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

.loading-text {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.loading-progress {
    width: 100%;
    height: 4px;
    background: var(--glass-bg);
    border-radius: 2px;
    overflow: hidden;
}

.loading-progress-bar {
    height: 100%;
    background: var(--color-primary);
    width: 0%;
    transition: width var(--transition-base);
}

/* Responsive */
@media (max-width: 768px) {
    html {
        font-size: 14px; /* Smaller base size */
    }
    
    /* Touch-friendly buttons */
    .btn-primary {
        padding: 0.6rem 1.2rem;
        font-size: var(--font-size-sm);
        min-height: 40px; /* Smaller touch target */
        width: 100%; /* Full width on mobile */
        max-width: 250px;
        justify-content: center;
    }
    
    .btn-control {
        min-height: 40px;
        padding: 0.5rem 1rem;
    }
}

/* Extra small mobile */
@media (max-width: 374px) {
    html {
        font-size: 14px;
    }
    
    .btn-primary {
        padding: 0.75rem 1.5rem;
        font-size: var(--font-size-sm);
    }
}