/* =============================================
   DESIGN SYSTEM — NL Tenant Assistant
   Single source of truth for all design tokens,
   resets, typography, and shared utilities.
   ============================================= */

/* --- Design Tokens --- */
:root {
    /* Brand Palette */
    --color-cream:       #f5f1eb;
    --color-cream-dark:  #ebe5db;
    --color-navy:        #0a1628;
    --color-navy-light:  #152338;
    --color-navy-mid:    #1e3050;
    --color-orange:      #f97316;
    --color-orange-soft: rgba(249, 115, 22, 0.1);
    --color-orange-hover:rgba(249, 115, 22, 0.2);
    --color-green:       #22c55e;
    --color-red:         #ef4444;

    /* Neutrals */
    --color-white:       #ffffff;
    --color-black:       #000000;
    --color-gray-50:     #fafafa;
    --color-gray-100:    #f5f5f5;
    --color-gray-200:    #e5e5e5;
    --color-gray-300:    #d4d4d4;
    --color-gray-400:    #a3a3a3;
    --color-gray-500:    #737373;
    --color-gray-600:    #525252;
    --color-gray-700:    #404040;
    --color-gray-800:    #262626;
    --color-gray-900:    #171717;

    /* Typography */
    --font-serif:  'Instrument Serif', Georgia, serif;
    --font-sans:   'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Layout */
    --sidebar-width:           260px;
    --sidebar-collapsed-width: 60px;
    --pdf-panel-default:       480px;
    --pdf-panel-min:           320px;
    --pdf-panel-max:           700px;
    --topbar-height:           52px;
    --chat-max-width:          768px;
    --promptbar-max-width:     768px;

    /* Motion */
    --transition-fast:    0.15s ease;
    --transition-normal:  0.25s ease;
    --transition-smooth:  0.35s cubic-bezier(0.4, 0, 0.2, 1);

    /* Elevation */
    --shadow-sm:   0 1px 3px rgba(0, 0, 0, 0.04);
    --shadow-md:   0 4px 12px rgba(0, 0, 0, 0.06);
    --shadow-lg:   0 8px 24px rgba(0, 0, 0, 0.08);
    --shadow-xl:   0 16px 48px rgba(0, 0, 0, 0.12);

    /* Borders */
    --border-light:    1px solid rgba(0, 0, 0, 0.06);
    --border-medium:   1px solid rgba(0, 0, 0, 0.1);
    --border-sidebar:  1px solid rgba(255, 255, 255, 0.06);

    /* Radius */
    --radius-sm:   6px;
    --radius-md:   10px;
    --radius-lg:   16px;
    --radius-xl:   24px;
    --radius-full: 9999px;
}

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

html {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: var(--font-sans);
    font-size: 15px;
    line-height: 1.6;
    color: var(--color-gray-700);
    background-color: var(--color-cream);
    min-height: 100vh;
}

#app-view {
    height: 100vh;
    width: 100vw;
    overflow: hidden;
    display: flex;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
img { display: block; max-width: 100%; }
input, textarea { font-family: inherit; }
ul, ol { list-style: none; }

/* Focus outline for accessibility */
:focus-visible {
    outline: 2px solid var(--color-orange);
    outline-offset: 2px;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--color-gray-300);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--color-gray-400);
}

/* Dark scrollbar for sidebar */
.sidebar ::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
}
.sidebar ::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.25);
}

/* --- Shared Animation Keyframes --- */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInScale {
    from { opacity: 0; transform: scale(0.96); }
    to   { opacity: 1; transform: scale(1); }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(10, 22, 40, 0.3); }
    50%      { box-shadow: 0 0 0 6px rgba(10, 22, 40, 0); }
}

@keyframes shimmer {
    0%   { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

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

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

/* Tooltip base */
.tooltip {
    position: relative;
}

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    left: calc(100% + 10px);
    top: 50%;
    transform: translateY(-50%);
    background: var(--color-gray-800);
    color: var(--color-white);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 500;
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--transition-fast);
    z-index: 100;
}

.tooltip:hover::after {
    opacity: 1;
}