/* ==========================================================================
   Base Styles - Reset & Foundation
   ========================================================================== */

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
    /* Prevent iOS text size adjustment */
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
    transition: background-color var(--transition-base), color var(--transition-base);
    /* Fix for touch devices - prevent sticky hover states */
    -webkit-tap-highlight-color: transparent;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
    color: var(--color-text);
}

h1 { font-size: var(--font-size-2xl); }
h2 { font-size: var(--font-size-xl); }
h3 { font-size: var(--font-size-lg); }

p {
    margin: 0;
    color: var(--color-text-secondary);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

/* Only apply hover on devices that support it */
@media (hover: hover) and (pointer: fine) {
    a:hover {
        color: var(--color-primary-hover);
    }
}

/* Form Elements */
button {
    font-family: inherit;
    font-size: inherit;
    cursor: pointer;
    border: none;
    background: none;
    outline: none;
    /* Fix for touch devices */
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

button:disabled {
    cursor: not-allowed;
    opacity: 0.5;
}

input, select, textarea {
    font-family: inherit;
    font-size: inherit;
    border: none;
    outline: none;
    background: none;
    /* Prevent zoom on iOS */
    font-size: 16px;
}

input::placeholder {
    color: var(--color-text-tertiary);
}

/* Focus States - only show on keyboard navigation */
:focus {
    outline: none;
}

:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Selection */
::selection {
    background-color: var(--color-primary-light);
    color: var(--color-text);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--color-border-strong);
    border-radius: var(--radius-full);
}

@media (hover: hover) {
    ::-webkit-scrollbar-thumb:hover {
        background: var(--color-text-tertiary);
    }
}

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

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}