/* ===================================
   Base Styles
   =================================== */

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

#app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===================================
   Typography
   =================================== */

h1 {
    font-family: var(--font-display);
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    letter-spacing: -0.015em;
}

h2 {
    font-family: var(--font-display);
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    letter-spacing: -0.015em;
}

h3 {
    font-family: var(--font-display);
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
}

h4 {
    font-family: var(--font-display);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
}

h5 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-medium);
}

h6 {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
}

p {
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
}

small {
    font-size: var(--font-size-sm);
}

a {
    color: var(--color-primary);
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-hover);
}

/* ===================================
   Focus Styles (Accessibility)
   =================================== */

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

/* ===================================
   Selection Styles
   =================================== */

::selection {
    background-color: var(--color-primary);
    color: var(--text-inverse);
}

/* ===================================
   Scrollbar Styles
   =================================== */

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

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

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

/* Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--border-color-dark) var(--bg-tertiary);
}

/* ===================================
   Loading Screen
   =================================== */

.loading-screen {
    position: fixed;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-4);
    background-color: var(--bg-primary);
    z-index: var(--z-modal);
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border-color);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* ===================================
   Toast Notifications
   =================================== */

.toast-container {
    position: fixed;
    top: var(--spacing-4);
    right: var(--spacing-4);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
    pointer-events: none;
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-3) var(--spacing-4);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    pointer-events: auto;
    animation: slideIn var(--transition-normal) ease;
    max-width: 400px;
}

.toast.success {
    border-color: rgba(52, 211, 153, 0.4);
}

.toast.success .toast-icon {
    color: var(--color-success);
}

.toast.error {
    border-color: rgba(248, 113, 113, 0.4);
}

.toast.error .toast-icon {
    color: var(--color-danger-hover);
}

.toast.warning {
    border-color: rgba(246, 176, 63, 0.4);
}

.toast.warning .toast-icon {
    color: var(--color-warning);
}

.toast.info {
    border-color: rgba(79, 216, 235, 0.4);
}

.toast.info .toast-icon {
    color: var(--color-info);
}

.toast-icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
}

.toast-message {
    flex: 1;
    font-size: var(--font-size-sm);
    color: var(--text-primary);
}

.toast-close {
    flex-shrink: 0;
    padding: var(--spacing-1);
    color: var(--text-tertiary);
    transition: color var(--transition-fast);
}

.toast-close:hover {
    color: var(--text-primary);
}

.toast.exiting {
    animation: slideOut var(--transition-normal) ease forwards;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideOut {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(100%);
    }
}

/* ===================================
   Empty State
   =================================== */

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-12);
    text-align: center;
}

.empty-state-icon {
    width: 80px;
    height: 80px;
    margin-bottom: var(--spacing-4);
    color: var(--text-tertiary);
}

.empty-state-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-2);
}

.empty-state-description {
    color: var(--text-secondary);
    max-width: 400px;
}

/* ===================================
   Reduced Motion
   =================================== */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}