/* ============================================
   Reusable Components
   Buttons, Cards, Modals, Navigation, Forms
   ============================================ */

/* ============================================
   Buttons
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 0.625rem 1.25rem;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    line-height: 1;
    text-align: center;
    text-decoration: none;
    border: 1px solid transparent;
    border-radius: var(--radius-xl);
    cursor: pointer;
    transition: all var(--transition-smooth);
    touch-action: manipulation;
    user-select: none;
    -webkit-user-select: none;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.btn:active:not(:disabled) {
    transform: scale(0.97);
}

/* Primary Button */
.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    color: white;
    border-color: transparent;
    box-shadow: var(--shadow-accent);
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--accent-hover) 0%, var(--accent-primary) 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-accent), var(--shadow-glow);
}

/* Secondary Button */
.btn-secondary {
    background: var(--glass-bg);
    color: var(--text-primary);
    border-color: var(--glass-border);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--glass-bg-strong);
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

/* Ghost Button */
.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border-color: transparent;
}

.btn-ghost:hover:not(:disabled) {
    background: var(--glass-bg);
    color: var(--accent-primary);
}

/* Icon Button */
.btn-icon {
    width: 44px;
    height: 44px;
    padding: 0;
    border-radius: var(--radius-full);
}

.btn-icon svg {
    width: 20px;
    height: 20px;
}

/* Button Sizes */
.btn-sm {
    padding: 0.4rem 0.85rem;
    font-size: var(--font-size-xs);
}

.btn-lg {
    padding: 0.875rem 1.5rem;
    font-size: var(--font-size-base);
}

/* ============================================
   Cards
   ============================================ */

.card {
    background: var(--bg-elevated);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    transition: all var(--transition-smooth);
}

.card:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-md), 0 0 20px var(--accent-glow);
}

.card-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.card-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.card-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin: 0;
}

.card-subtitle {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-top: var(--space-xs);
}

.card-body {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

.card-actions {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-md);
    flex-wrap: wrap;
}

/* Interactive Card */
.card-interactive {
    cursor: pointer;
}

.card-interactive:active {
    transform: scale(0.98);
}

/* ============================================
   Tab Bar (Bottom Navigation)
   ============================================ */

.tab-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    height: var(--tab-bar-height);
    background: var(--bg-primary);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-top: 1px solid var(--glass-border);
    z-index: var(--z-navbar);
    padding-bottom: env(safe-area-inset-bottom);
    box-sizing: content-box;
}

.tab-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: var(--space-sm);
    color: var(--text-muted);
    text-decoration: none;
    transition: color var(--transition-fast);
    cursor: pointer;
    background: none;
    border: none;
    min-height: 44px;
    min-width: 44px;
}

.tab-btn svg {
    width: 24px;
    height: 24px;
    stroke-width: 1.5;
}

.tab-btn span {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
}

.tab-btn.active {
    color: var(--accent-primary);
}

.tab-btn:hover:not(.active) {
    color: var(--text-secondary);
}

/* Tab Bar Safe Area Fill */
.tab-bar::after {
    content: '';
    position: absolute;
    bottom: calc(-1 * env(safe-area-inset-bottom));
    left: 0;
    right: 0;
    height: env(safe-area-inset-bottom);
    background: var(--bg-primary);
    z-index: -1;
}

/* ============================================
   Header
   ============================================ */

.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    padding-top: max(var(--space-md), env(safe-area-inset-top));
    background: var(--bg-secondary);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--glass-border);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
}

.header-title {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
}

.header-title span {
    font-size: 1.5rem;
}

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

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

.header-btn:active {
    transform: scale(0.95);
}

.header-btn svg {
    width: 24px;
    height: 24px;
}

/* ============================================
   Menu Options
   ============================================ */

.menu-option {
    display: flex;
    align-items: center;
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
    text-decoration: none;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: left;
}

.menu-option:hover {
    background: var(--glass-bg);
    color: var(--accent-primary);
}

.menu-option:active {
    transform: scale(0.98);
}

/* ============================================
   Modal / Overlay
   ============================================ */

.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: var(--z-modal-backdrop);
    display: none;
    align-items: center;
    justify-content: center;
    padding: var(--space-md);
}

.modal-backdrop.active {
    display: flex;
}

.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    max-width: 420px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: modalSlideIn 0.3s ease-out;
}

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

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

.modal-header h2,
.modal-header h3 {
    margin: 0;
    font-size: var(--font-size-xl);
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--space-xs);
    line-height: 1;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--bg-primary);
    color: var(--accent-primary);
}

.modal-body {
    padding: var(--space-lg);
}

.modal-footer {
    display: flex;
    gap: var(--space-sm);
    justify-content: flex-end;
    padding: var(--space-lg);
    border-top: 1px solid var(--glass-border);
}

/* ============================================
   Slide Panel
   ============================================ */

.panel {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    height: calc(100dvh - var(--tab-bar-height) - env(safe-area-inset-bottom));
    background: var(--bg-primary);
    z-index: var(--z-modal);
    transition: right 0.3s var(--transition-smooth);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    display: flex;
    flex-direction: column;
}

.panel.active {
    right: 0;
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    padding-top: max(var(--space-md), env(safe-area-inset-top));
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--glass-border);
    position: sticky;
    top: 0;
    z-index: var(--z-base);
}

.panel-header h2 {
    margin: 0;
    font-size: var(--font-size-xl);
}

.panel-content {
    flex: 1;
    padding: var(--space-lg);
    padding-bottom: var(--space-xl);
}

/* ============================================
   Form Elements
   ============================================ */

.input {
    width: 100%;
    padding: 0.875rem var(--space-md);
    font-size: 16px; /* Prevents iOS zoom */
    font-family: inherit;
    color: var(--text-primary);
    background: var(--bg-elevated);
    border: 1.5px solid var(--glass-border);
    border-radius: var(--radius-xl);
    outline: none;
    transition: all var(--transition-smooth);
    -webkit-appearance: none;
}

.input:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
    background: var(--bg-secondary);
}

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

/* Input Group */
.input-group {
    display: flex;
    gap: var(--space-sm);
    align-items: center;
}

.input-group .input {
    flex: 1;
}

/* ============================================
   Messages / Chat Bubbles
   ============================================ */

.message {
    max-width: 85%;
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-lg);
    line-height: 1.6;
    font-size: var(--font-size-base);
    animation: messageSlideIn 0.3s ease-out;
    box-shadow: var(--shadow-sm);
}

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

.message-assistant {
    align-self: flex-start;
    background: var(--bg-mandy-message);
    border: 1px solid var(--glass-border);
    border-bottom-left-radius: 4px;
}

.message-user {
    align-self: flex-end;
    background: var(--bg-user-message);
    border: 1px solid var(--glass-border);
    border-bottom-right-radius: 4px;
}

/* Typing Indicator */
.message-typing {
    padding: var(--space-md) var(--space-lg);
}

.typing-dots {
    display: flex;
    gap: 0.35rem;
    align-items: center;
}

.typing-dots span {
    width: 8px;
    height: 8px;
    border-radius: var(--radius-full);
    background: var(--text-secondary);
    animation: typingBounce 1.4s infinite ease-in-out;
}

.typing-dots span:nth-child(2) { animation-delay: 0.2s; }
.typing-dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingBounce {
    0%, 60%, 100% { transform: translateY(0); }
    30% { transform: translateY(-8px); }
}

/* ============================================
   Category Headers
   ============================================ */

.category-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-secondary);
    margin: var(--space-xl) 0 var(--space-md) 0;
}

.category-header:first-child {
    margin-top: 0;
}

.category-header::before {
    content: '';
    width: 3px;
    height: 16px;
    background: var(--accent-primary);
    border-radius: 2px;
}

/* ============================================
   Badges / Tags
   ============================================ */

.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-xs) var(--space-sm);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-xl);
    background: var(--glass-bg);
    color: var(--text-secondary);
}

.badge-accent {
    background: var(--accent-glow);
    color: var(--accent-primary);
}