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

html {
    font-size: 16px;
    line-height: 1.6;
    -webkit-text-size-adjust: 100%;
    -moz-text-size-adjust: 100%;
    text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--color-background-primary);
    color: var(--color-text-primary);
    transition: background-color 0.3s cubic-bezier(0.4, 0, 0.2, 1), 
                color 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow-x: hidden;
}

button,
textarea,
select,
input,
.panel,
.container,
header,
.theme-toggle,
.lang-select {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

*:focus {
    outline: none;
}

*:focus-visible {
    outline: 2px solid var(--color-blue);
    outline-offset: 2px;
    border-radius: 4px;
}

::-webkit-scrollbar {
    width: 12px;
    height: 12px;
}

::-webkit-scrollbar-track {
    background: var(--color-background-secondary);
    border-radius: 6px;
}

::-webkit-scrollbar-thumb {
    background: var(--color-scrollbar-thumb);
    border-radius: 6px;
    border: 2px solid var(--color-background-secondary);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-scrollbar-thumb-hover);
}

* {
    scrollbar-width: thin;
    scrollbar-color: var(--color-scrollbar-thumb) var(--color-background-secondary);
}

::selection {
    background-color: var(--color-blue-alpha-30);
    color: var(--color-text-primary);
}

::-moz-selection {
    background-color: var(--color-blue-alpha-30);
    color: var(--color-text-primary);
}

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

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

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

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

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

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

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

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

@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

.fade-in {
    animation: fadeIn 0.3s ease;
}

.fade-in-up {
    animation: fadeInUp 0.4s ease;
}

.slide-in-right {
    animation: slideInRight 0.3s ease;
}

.loading {
    pointer-events: none;
    opacity: 0.6;
    cursor: wait;
}

.skeleton {
    background: linear-gradient(
        90deg,
        var(--color-background-secondary) 0%,
        var(--color-input-background) 50%,
        var(--color-background-secondary) 100%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 4px;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.focus-visible {
    box-shadow: 0 0 0 3px var(--color-blue-alpha-30);
    transition: box-shadow 0.2s ease;
}