/* ==========================================================================
   Components - UI Elements
   ========================================================================== */

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    flex-shrink: 0;
    touch-action: manipulation;
}

.btn svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

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

/* Desktop hover only */
@media (hover: hover) and (pointer: fine) {
    .btn-primary:hover:not(:disabled) {
        background-color: var(--color-primary-hover);
        transform: translateY(-1px);
        box-shadow: var(--shadow-md);
    }
}

/* Touch active state */
.btn-primary:active:not(:disabled) {
    background-color: var(--color-primary-hover);
    transform: scale(0.98);
}

.btn-secondary {
    background-color: var(--color-bg-subtle);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

@media (hover: hover) and (pointer: fine) {
    .btn-secondary:hover:not(:disabled) {
        background-color: var(--color-border);
        border-color: var(--color-border-strong);
    }
}

.btn-secondary:active:not(:disabled) {
    background-color: var(--color-border);
}

.btn-search {
    min-width: 100px;
}

.btn-today {
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-primary);
    background-color: var(--color-bg-elevated);
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-md);
}

@media (hover: hover) and (pointer: fine) {
    .btn-today:hover {
        background-color: var(--color-primary);
        color: var(--color-text-inverse);
    }
}

.btn-today:active {
    background-color: var(--color-primary);
    color: var(--color-text-inverse);
}

.btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    padding: 0;
    border: none;
    border-radius: var(--radius-md);
    background-color: transparent;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

@media (hover: hover) and (pointer: fine) {
    .btn-icon:hover:not(:disabled) {
        background-color: var(--color-bg-subtle);
        color: var(--color-primary);
    }
}

.btn-icon:active:not(:disabled) {
    background-color: var(--color-bg-subtle);
    color: var(--color-primary);
}

.btn-icon svg {
    width: 22px;
    height: 22px;
}

.btn:disabled,
.btn-icon:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* --------------------------------------------------------------------------
   Theme Toggle Button
   -------------------------------------------------------------------------- */

.theme-toggle-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    padding: 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: var(--color-bg-subtle);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

@media (hover: hover) and (pointer: fine) {
    .theme-toggle-btn:hover {
        background-color: var(--color-primary-light);
        border-color: var(--color-primary);
        color: var(--color-primary);
    }
}

.theme-toggle-btn:active {
    background-color: var(--color-primary-light);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.theme-toggle-btn svg {
    width: 22px;
    height: 22px;
}

.theme-icon-dark {
    display: none;
}

.theme-icon-light {
    display: block;
}

[data-theme="dark"] .theme-icon-dark {
    display: block;
}

[data-theme="dark"] .theme-icon-light {
    display: none;
}

/* --------------------------------------------------------------------------
   Inputs
   -------------------------------------------------------------------------- */

.input-wrapper {
    position: relative;
    flex: 1;
    min-width: 0;
}

.input-wrapper-full {
    flex: 1;
    width: 100%;
}

.input-icon {
    position: absolute;
    left: var(--space-3);
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    color: var(--color-text-tertiary);
    pointer-events: none;
}

.input {
    width: 100%;
    height: 48px;
    padding: 0 var(--space-4);
    padding-left: var(--space-10);
    font-size: var(--font-size-base);
    font-family: inherit;
    background-color: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    transition: all var(--transition-fast);
}

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

.input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

/* --------------------------------------------------------------------------
   Select
   -------------------------------------------------------------------------- */

.select-wrapper {
    position: relative;
    flex: 1;
    min-width: 0;
}

.select {
    width: 100%;
    height: 48px;
    padding: 0 var(--space-10) 0 var(--space-4);
    font-size: var(--font-size-base);
    font-family: inherit;
    background-color: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    cursor: pointer;
    appearance: none;
    transition: all var(--transition-fast);
}

.select:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.select-wrapper::after {
    content: '';
    position: absolute;
    right: var(--space-4);
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 5px solid var(--color-text-secondary);
    pointer-events: none;
}

/* --------------------------------------------------------------------------
   Badges
   -------------------------------------------------------------------------- */

.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-2);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-sm);
    text-transform: uppercase;
    letter-spacing: 0.025em;
    white-space: nowrap;
}

.badge-lecture { background-color: rgba(33, 150, 243, 0.15); color: var(--color-lecture); }
.badge-practice { background-color: rgba(76, 175, 80, 0.15); color: var(--color-practice); }
.badge-lab { background-color: rgba(0, 188, 212, 0.15); color: var(--color-lab); }
.badge-seminar { background-color: rgba(156, 39, 176, 0.15); color: var(--color-seminar); }
.badge-consult { background-color: rgba(233, 30, 99, 0.15); color: var(--color-consult); }
.badge-exam { background-color: rgba(244, 67, 54, 0.15); color: var(--color-exam); }
.badge-credit { background-color: rgba(103, 58, 183, 0.15); color: var(--color-credit); }
.badge-class { background-color: rgba(255, 152, 0, 0.15); color: var(--color-class); }

/* --------------------------------------------------------------------------
   Radio Tabs
   -------------------------------------------------------------------------- */

.radio-tabs {
    display: inline-flex;
    background-color: var(--color-bg-subtle);
    padding: var(--space-1);
    border-radius: var(--radius-md);
    gap: var(--space-1);
}

.radio-tab {
    position: relative;
}

.radio-tab input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.radio-tab-label {
    display: block;
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.radio-tab input:checked + .radio-tab-label {
    background-color: var(--color-bg-elevated);
    color: var(--color-text);
    box-shadow: var(--shadow-sm);
}

/* --------------------------------------------------------------------------
   Modal
   -------------------------------------------------------------------------- */

.modal-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
    z-index: var(--z-modal);
    animation: fadeIn var(--transition-fast);
    backdrop-filter: blur(4px);
}

.modal {
    background-color: var(--color-bg-elevated);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: 480px;
    max-height: 90vh;
    overflow: hidden;
    animation: fadeInUp var(--transition-base);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-5) var(--space-6);
    border-bottom: 1px solid var(--color-border);
}

.modal-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
}

.modal-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    border: none;
    background: transparent;
    color: var(--color-text-secondary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.modal-close:active {
    background-color: var(--color-bg-subtle);
    color: var(--color-text);
}

.modal-close svg {
    width: 20px;
    height: 20px;
}

.modal-body {
    padding: var(--space-6);
    overflow-y: auto;
    color: var(--color-text);
}

/* --------------------------------------------------------------------------
   Loader
   -------------------------------------------------------------------------- */

.loader-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    backdrop-filter: blur(2px);
}

.loader {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-6);
    background-color: var(--color-bg-elevated);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

.loader-spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: var(--radius-full);
    animation: spin 0.8s linear infinite;
}

.loader-text {
    color: var(--color-text);
    font-weight: var(--font-weight-medium);
}

/* --------------------------------------------------------------------------
   Alert
   -------------------------------------------------------------------------- */

.alert {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-4);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
}

.alert-error {
    background-color: rgba(244, 67, 54, 0.1);
    border: 1px solid rgba(244, 67, 54, 0.2);
    color: var(--color-error);
}

.alert-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}