/* ==========================================================================
   Nexus Terminal — Reusable Components
   Buttons, form controls, badges, dropdowns, modals, notifications, etc.
   ========================================================================== */

/* =======================================================================
   BUTTONS
   ======================================================================= */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    height: 30px;
    padding: 0 var(--space-3);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    line-height: 1;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    white-space: nowrap;
    transition:
        background var(--transition-fast),
        border-color var(--transition-fast),
        color var(--transition-fast),
        box-shadow var(--transition-fast);
    user-select: none;
}

.btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    pointer-events: none;
}

/* Primary — accent filled */
.btn-primary {
    background: var(--accent);
    color: var(--text-inverse);
    border-color: var(--accent);
}
.btn-primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
}
.btn-primary:active {
    background: #3da69f;
    border-color: #3da69f;
}

/* Accent — success-tinted action, e.g. "Save & Connect" */
.btn-accent {
    background: var(--success);
    color: var(--text-inverse);
    border-color: var(--success);
}
.btn-accent:hover {
    background: #57a85c;
    border-color: #57a85c;
}
.btn-accent:active {
    background: #4a9a4e;
    border-color: #4a9a4e;
}

/* Secondary — subtle border */
.btn-secondary {
    background: transparent;
    color: var(--text-secondary);
    border-color: var(--border-default);
}
.btn-secondary:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--border-strong);
}
.btn-secondary:active {
    background: var(--bg-active);
}

/* Ghost — transparent, hover only */
.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}
.btn-ghost:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}
.btn-ghost:active {
    background: var(--bg-active);
}

/* Danger */
.btn-danger {
    background: transparent;
    color: var(--error);
    border-color: var(--error);
}
.btn-danger:hover {
    background: rgba(239, 83, 80, 0.12);
}
.btn-danger:active {
    background: rgba(239, 83, 80, 0.20);
}

.btn-danger-filled {
    background: var(--error);
    color: #fff;
    border-color: var(--error);
}
.btn-danger-filled:hover {
    background: #e53935;
    border-color: #e53935;
}

/* Size variants */
.btn-sm {
    height: 26px;
    padding: 0 var(--space-2);
    font-size: var(--text-xs);
}

.btn-xs {
    height: 22px;
    padding: 0 var(--space-2);
    font-size: var(--text-xs);
    border-radius: var(--radius-sm);
}

/* Icon-only button (square) */
.btn-icon {
    width: 30px;
    padding: 0;
    flex-shrink: 0;
}
.btn-icon.btn-sm {
    width: 26px;
}
.btn-icon.btn-xs {
    width: 22px;
}

/* Button group */
.btn-group {
    display: inline-flex;
}

/* Outline button — transparent background, subtle border */
.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
}
.btn-outline:hover {
    background: var(--surface-2);
    color: var(--text-primary);
}

.btn-group .btn {
    border-radius: 0;
}
.btn-group .btn:first-child {
    border-radius: var(--radius-md) 0 0 var(--radius-md);
}
.btn-group .btn:last-child {
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}
.btn-group .btn + .btn {
    margin-left: -1px;
}


/* =======================================================================
   FORM CONTROLS
   ======================================================================= */

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.form-label {
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    color: var(--text-secondary);
    user-select: none;
}

.form-label-required::after {
    content: ' *';
    color: var(--error);
}

/* Text input, select, textarea share a common treatment */
.form-input,
.form-select,
.form-textarea {
    height: 30px;
    padding: 0 var(--space-3);
    font-size: var(--text-sm);
    color: var(--text-primary);
    background: var(--bg-input);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    transition:
        border-color var(--transition-fast),
        box-shadow var(--transition-fast);
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--text-disabled);
}

.form-input:hover,
.form-select:hover,
.form-textarea:hover {
    border-color: var(--border-strong);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-muted);
    outline: none;
}

.form-input:disabled,
.form-select:disabled,
.form-textarea:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Select arrow */
.form-select {
    appearance: none;
    padding-right: var(--space-8);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%236e6e88'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    cursor: pointer;
}

/* Textarea */
.form-textarea {
    height: auto;
    min-height: 64px;
    padding: var(--space-2) var(--space-3);
    resize: vertical;
    line-height: var(--leading-normal);
}

/* Help text */
.form-help {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    line-height: var(--leading-normal);
}

/* Error message */
.form-error {
    font-size: var(--text-xs);
    color: var(--error);
    line-height: var(--leading-normal);
}

/* Error state on inputs */
.form-input.is-error,
.form-select.is-error,
.form-textarea.is-error {
    border-color: var(--error);
}
.form-input.is-error:focus,
.form-select.is-error:focus,
.form-textarea.is-error:focus {
    box-shadow: 0 0 0 2px rgba(239, 83, 80, 0.20);
}

/* Inline layout (label beside control) */
.form-inline {
    flex-direction: row;
    align-items: center;
    gap: var(--space-3);
}
.form-inline .form-label {
    min-width: 100px;
    flex-shrink: 0;
}

/* Checkbox */
.form-checkbox {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    cursor: pointer;
    font-size: var(--text-sm);
    color: var(--text-secondary);
    user-select: none;
}

.form-checkbox input[type="checkbox"] {
    appearance: none;
    width: 16px;
    height: 16px;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    background: var(--bg-input);
    flex-shrink: 0;
    cursor: pointer;
    transition:
        background var(--transition-fast),
        border-color var(--transition-fast);
    position: relative;
}

.form-checkbox input[type="checkbox"]:checked {
    background: var(--accent);
    border-color: var(--accent);
}

.form-checkbox input[type="checkbox"]:checked::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 5px;
    width: 4px;
    height: 8px;
    border: solid var(--text-inverse);
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.form-checkbox input[type="checkbox"]:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Toggle switch */
.form-toggle {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    cursor: pointer;
    font-size: var(--text-sm);
    color: var(--text-secondary);
    user-select: none;
}

.form-toggle input[type="checkbox"] {
    appearance: none;
    width: 32px;
    height: 18px;
    border-radius: var(--radius-full);
    background: var(--border-strong);
    position: relative;
    cursor: pointer;
    flex-shrink: 0;
    transition: background var(--transition-normal);
}

.form-toggle input[type="checkbox"]::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--text-secondary);
    transition: transform var(--transition-normal), background var(--transition-normal);
}

.form-toggle input[type="checkbox"]:checked {
    background: var(--accent);
}

.form-toggle input[type="checkbox"]:checked::after {
    transform: translateX(14px);
    background: var(--text-inverse);
}


/* =======================================================================
   BADGES
   ======================================================================= */

.badge {
    display: inline-flex;
    align-items: center;
    height: 18px;
    padding: 0 var(--space-2);
    font-size: 10px;
    font-weight: var(--weight-semibold);
    line-height: 1;
    border-radius: var(--radius-sm);
    white-space: nowrap;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    background: var(--bg-overlay);
    color: var(--text-secondary);
}

/* Protocol badges */
.badge-ssh {
    background: rgba(78, 205, 196, 0.15);
    color: var(--protocol-ssh);
}
.badge-telnet {
    background: rgba(255, 167, 38, 0.15);
    color: var(--protocol-telnet);
}
.badge-raw {
    background: rgba(171, 71, 188, 0.15);
    color: var(--protocol-raw);
}
.badge-github {
    background: rgba(124, 138, 255, 0.15);
    color: var(--protocol-github);
}

/* Status badges */
.badge-status {
    gap: var(--space-1);
}
.badge-status::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--text-tertiary);
    flex-shrink: 0;
}
.badge-status.is-connected::before    { background: var(--success); }
.badge-status.is-connecting::before   { background: var(--warning); animation: pulse-dot 1.2s ease infinite; }
.badge-status.is-error::before        { background: var(--error); }
.badge-status.is-disconnected::before { background: var(--text-tertiary); }

@keyframes pulse-dot {
    0%, 100% { opacity: 1; }
    50%      { opacity: 0.4; }
}


/* =======================================================================
   CARDS & SURFACES
   ======================================================================= */

.surface {
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.card {
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    cursor: pointer;
    transition:
        background var(--transition-fast),
        border-color var(--transition-fast),
        box-shadow var(--transition-fast);
}
.card:hover {
    background: var(--bg-hover);
    border-color: var(--border-default);
    box-shadow: var(--shadow-md);
}
.card:active {
    background: var(--bg-active);
}


/* =======================================================================
   DROPDOWN / CONTEXT MENU
   ======================================================================= */

.dropdown {
    position: relative;
    display: inline-flex;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    z-index: var(--z-dropdown);
    min-width: 160px;
    padding: var(--space-1) 0;
    background: var(--bg-overlay);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-4px);
    transition:
        opacity var(--transition-fast),
        visibility var(--transition-fast),
        transform var(--transition-fast);
}

.dropdown.is-open .dropdown-menu,
.dropdown-menu.is-visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(2px);
}

/* Right-aligned variant */
.dropdown-menu.is-right {
    left: auto;
    right: 0;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    width: 100%;
    padding: var(--space-1) var(--space-3);
    font-size: var(--text-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast);
    border: none;
    background: none;
    text-align: left;
}

.dropdown-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.dropdown-item.is-danger {
    color: var(--error);
}
.dropdown-item.is-danger:hover {
    background: rgba(239, 83, 80, 0.10);
}

.dropdown-item.is-disabled {
    opacity: 0.4;
    pointer-events: none;
}

.dropdown-item-icon {
    width: 16px;
    text-align: center;
    flex-shrink: 0;
    font-size: var(--text-md);
}

.dropdown-item-shortcut {
    margin-left: auto;
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

.dropdown-separator {
    height: 1px;
    margin: var(--space-1) 0;
    background: var(--border-subtle);
}

.dropdown-header {
    padding: var(--space-1) var(--space-3);
    font-size: var(--text-xs);
    font-weight: var(--weight-semibold);
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}


/* =======================================================================
   NOTIFICATIONS (toast)
   ======================================================================= */

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

.notification {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    min-width: 280px;
    max-width: 400px;
    padding: var(--space-3) var(--space-4);
    background: var(--bg-overlay);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    pointer-events: auto;
    animation: notification-in var(--transition-slow) ease forwards;
}

.notification.is-leaving {
    animation: notification-out var(--transition-normal) ease forwards;
}

@keyframes notification-in {
    from { opacity: 0; transform: translateX(20px); }
    to   { opacity: 1; transform: translateX(0); }
}
@keyframes notification-out {
    from { opacity: 1; transform: translateX(0); }
    to   { opacity: 0; transform: translateX(20px); }
}

.notification-icon {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 11px;
    font-weight: var(--weight-bold);
    line-height: 1;
    color: var(--text-inverse);
    background: var(--text-tertiary);
}

.notification-success .notification-icon { background: var(--success); }
.notification-error .notification-icon   { background: var(--error); }
.notification-warning .notification-icon { background: var(--warning); }
.notification-info .notification-icon    { background: var(--info); }

.notification-body {
    flex: 1;
    min-width: 0;
}

.notification-title {
    font-size: var(--text-sm);
    font-weight: var(--weight-semibold);
    color: var(--text-primary);
    margin-bottom: 2px;
}

.notification-message {
    font-size: var(--text-xs);
    color: var(--text-secondary);
    line-height: var(--leading-normal);
}

.notification-close {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    color: var(--text-tertiary);
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast);
}
.notification-close:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

/* Colour variants (left border accent) */
.notification-success { border-left: 3px solid var(--success); }
.notification-error   { border-left: 3px solid var(--error); }
.notification-warning { border-left: 3px solid var(--warning); }
.notification-info    { border-left: 3px solid var(--info); }


/* =======================================================================
   DISCLOSURE / ACCORDION
   ======================================================================= */

.disclosure {
    border-bottom: 1px solid var(--border-subtle);
}

.disclosure-header {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    color: var(--text-secondary);
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast);
    user-select: none;
    text-align: left;
    background: none;
    border: none;
}

.disclosure-header:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.disclosure-chevron {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    transition: transform var(--transition-normal);
    color: var(--text-tertiary);
}

.disclosure.is-open .disclosure-chevron {
    transform: rotate(90deg);
}

.disclosure-content {
    overflow: hidden;
    max-height: 0;
    transition: max-height var(--transition-slow);
}

.disclosure.is-open .disclosure-content {
    max-height: 2000px;
}

.disclosure-content-inner {
    padding: 0 var(--space-4) var(--space-4);
}


/* =======================================================================
   SEARCH INPUT
   ======================================================================= */

.search-input {
    width: 100%;
    height: 30px;
    padding: 0 var(--space-3) 0 var(--space-8);
    font-size: var(--text-sm);
    color: var(--text-primary);
    background: var(--bg-input);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

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

.search-input:hover {
    border-color: var(--border-default);
}

.search-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-muted);
    outline: none;
}

/* Wrapper with icon */
.search-wrapper {
    position: relative;
}

.search-wrapper::before {
    content: '⌕';
    position: absolute;
    left: var(--space-3);
    top: 50%;
    transform: translateY(-50%);
    font-size: var(--text-sm);
    color: var(--text-tertiary);
    pointer-events: none;
}


/* =======================================================================
   EMPTY STATE
   ======================================================================= */

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 1;
    padding: var(--space-8);
    text-align: center;
}

.empty-state-icon {
    font-size: 48px;
    color: var(--text-tertiary);
    margin-bottom: var(--space-4);
    opacity: 0.5;
}

.empty-state h2 {
    font-size: var(--text-lg);
    font-weight: var(--weight-semibold);
    color: var(--text-secondary);
    margin-bottom: var(--space-2);
}

.empty-state p {
    font-size: var(--text-sm);
    color: var(--text-tertiary);
    max-width: 320px;
    line-height: var(--leading-relaxed);
    margin-bottom: var(--space-6);
}

.empty-state-actions {
    display: flex;
    gap: var(--space-3);
}


/* =======================================================================
   TOOLTIP
   ======================================================================= */

.tooltip {
    position: absolute;
    z-index: var(--z-tooltip);
    padding: var(--space-1) var(--space-2);
    font-size: var(--text-xs);
    font-weight: var(--weight-medium);
    color: var(--text-primary);
    background: var(--bg-overlay);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.tooltip.is-visible {
    opacity: 1;
}


/* =======================================================================
   DIVIDER
   ======================================================================= */

.divider {
    height: 1px;
    background: var(--border-subtle);
    margin: var(--space-2) 0;
}

.divider-vertical {
    width: 1px;
    align-self: stretch;
    background: var(--border-subtle);
    margin: 0 var(--space-2);
}


/* =======================================================================
   LOADING / SPINNER
   ======================================================================= */

.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid var(--border-strong);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

.spinner-sm {
    width: 12px;
    height: 12px;
    border-width: 1.5px;
}

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