/**
 * Theme — Base Element Styles & Layout Utilities
 *
 * Pure CSS only. Zero frameworks. Dark theme default.
 * References var() from variables.css.
 *
 * @package    HoloSuiteAI
 * @subpackage Theme
 * @version    2.0.0
 * @author     HoloSuite Industries
 */

/* ============================================================
 * CSS RESET / NORMALIZE (Minimal)
 * ============================================================ */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    -webkit-text-size-adjust: 100%;
    -moz-tab-size: 4;
    tab-size: 4;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--text-primary);
    background-color: var(--bg-body);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
}

/* ============================================================
 * EMOJI FONT SUPPORT
 * Ensures emoji characters render correctly across all browsers/OS
 * ============================================================ */
.sidebar-link-icon,
.emoji-icon,
[class*="-icon"] {
    font-family: "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji", "Android Emoji", "EmojiOne Color", sans-serif;
    font-style: normal;
    font-weight: normal;
    line-height: 1;
}

img,
svg,
video,
canvas,
audio,
iframe,
embed,
object {
    display: block;
    max-width: 100%;
    height: auto;
}

button,
input,
select,
textarea {
    font: inherit;
    color: inherit;
}

a {
    color: var(--text-link);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--text-link-hover);
}

ul,
ol {
    list-style: none;
}

table {
    border-collapse: collapse;
    width: 100%;
}

/* ============================================================
 * BASE HEADINGS
 * ============================================================ */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-family-heading);
    color: var(--text-heading);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    margin-bottom: var(--space-4);
}

h1 {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-extrabold);
    letter-spacing: -0.02em;
}

h2 {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.01em;
}

h3 {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-semibold);
}

h4 {
    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-md);
    font-weight: var(--font-weight-medium);
}

p {
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--space-4);
}

p:last-child {
    margin-bottom: 0;
}

strong, b {
    font-weight: var(--font-weight-semibold);
}

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

code {
    font-family: var(--font-family-mono);
    font-size: 0.875em;
    background: var(--bg-elevated);
    padding: 0.15em 0.4em;
    border-radius: var(--radius-sm);
}

/* ============================================================
 * FORM ELEMENTS
 * ============================================================ */
.field-wrapper {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    margin-bottom: var(--space-6);
}

.field-wrapper label {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--text-secondary);
}

.input-field {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-base);
    color: var(--text-primary);
    background: var(--bg-input);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    outline: none;
}

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

.input-field:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

textarea.input-field {
    min-height: 120px;
    resize: vertical;
}

select.input-field {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%238888a4' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-4) center;
    padding-right: var(--space-10);
}

.toggle-label {
    display: inline-flex;
    align-items: center;
    gap: var(--space-3);
    cursor: pointer;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    user-select: none;
}

.toggle-label input[type="checkbox"] {
    width: 1.25rem;
    height: 1.25rem;
    accent-color: var(--color-primary);
    cursor: pointer;
}

/* ============================================================
 * BUTTONS
 * ============================================================ */
.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    line-height: 1;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
    user-select: none;
}

.button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.button-primary {
    background: var(--color-primary);
    color: #ffffff;
    border-color: var(--color-primary);
}

.button-primary:hover:not(:disabled) {
    background: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
    box-shadow: var(--shadow-glow-sm);
}

.button-secondary {
    background: transparent;
    color: var(--text-primary);
    border-color: var(--border-primary);
}

.button-secondary:hover:not(:disabled) {
    background: var(--bg-hover);
    border-color: var(--color-primary);
    color: var(--color-primary-light);
}

.button-danger {
    background: var(--color-danger);
    color: #ffffff;
    border-color: var(--color-danger);
}

.button-danger:hover:not(:disabled) {
    background: var(--color-danger-hover);
    border-color: var(--color-danger-hover);
}

.button-success {
    background: var(--color-success);
    color: #ffffff;
    border-color: var(--color-success);
}

.button-success:hover:not(:disabled) {
    background: var(--color-success-hover);
    border-color: var(--color-success-hover);
}

.button-small {
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-xs);
}

/* ============================================================
 * LAYOUT CLASSES
 * ============================================================ */
.content-wrapper {
    width: 100%;
    max-width: var(--content-max-width);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-6);
    padding-right: var(--space-6);
}

.page-wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.panel {
    background: var(--bg-surface);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

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

.panel-header h3,
.panel-header h4 {
    margin-bottom: 0;
}

.panel-body {
    padding: var(--space-6);
}

/* ============================================================
 * GRID UTILITIES
 * ============================================================ */
.form-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-6);
}

@media (min-width: 768px) {
    .form-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.widget-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-6);
}

@media (min-width: 640px) {
    .widget-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .widget-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 1280px) {
    .widget-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* ============================================================
 * DATA TABLE
 * ============================================================ */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
}

.data-table thead {
    background: var(--bg-secondary);
}

.data-table th {
    padding: var(--space-3) var(--space-4);
    text-align: left;
    font-weight: var(--font-weight-semibold);
    color: var(--text-muted);
    font-size: var(--font-size-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--border-primary);
}

.data-table td {
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--border-secondary);
    color: var(--text-secondary);
}

.data-table tbody tr:hover {
    background: var(--bg-hover);
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

/* ============================================================
 * MESSAGES
 * ============================================================ */
.message {
    padding: var(--space-4) var(--space-5);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    border: 1px solid transparent;
    margin-bottom: var(--space-4);
}

.message-error {
    background: var(--color-danger-light);
    color: var(--color-danger-text);
    border-color: rgba(239, 68, 68, 0.3);
}

.message-success {
    background: var(--color-success-light);
    color: var(--color-success-text);
    border-color: rgba(16, 185, 129, 0.3);
}

.message-warning {
    background: var(--color-warning-light);
    color: var(--color-warning-text);
    border-color: rgba(245, 158, 11, 0.3);
}

.message-info {
    background: var(--color-info-light);
    color: var(--color-info-text);
    border-color: rgba(59, 130, 246, 0.3);
}

/* ============================================================
 * STATUS LABELS
 * ============================================================ */
.status-label {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-3);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-full);
    line-height: 1.4;
}

.status-label-success {
    background: var(--color-success-light);
    color: var(--color-success-text);
}

.status-label-warning {
    background: var(--color-warning-light);
    color: var(--color-warning-text);
}

.status-label-danger {
    background: var(--color-danger-light);
    color: var(--color-danger-text);
}

.status-label-info {
    background: var(--color-info-light);
    color: var(--color-info-text);
}

/* ============================================================
 * RESPONSIVE BREAKPOINTS (Mobile-first)
 *
 * @media (min-width: 640px) { ... }   — sm
 * @media (min-width: 768px) { ... }   — md
 * @media (min-width: 1024px) { ... }  — lg
 * @media (min-width: 1280px) { ... }  — xl
 * @media (min-width: 1440px) { ... }  — 2xl
 * ============================================================ */

/* ============================================================
 * SCROLLBAR STYLING (Dark Theme)
 * ============================================================ */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

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

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

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

/* ============================================================
 * UTILITIES
 * ============================================================ */
.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;
}