/**
 * Shoe Rack — Stylesheet
 * Mobile-first, minimal, fast.
 */

/* ============================================================
   RESET & BASE
   ============================================================ */

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

:root {
    --color-bg: #f5f5f0;
    --color-surface: #ffffff;
    --color-text: #1a1a1a;
    --color-text-muted: #6b6b6b;
    --color-border: #e0e0dc;
    --color-accent: #2d2d2d;
    --color-accent-hover: #444444;
    --color-tag-bg: #eeeee8;
    --color-tag-text: #4a4a4a;
    --color-tag-active-bg: #2d2d2d;
    --color-tag-active-text: #ffffff;
    --color-error: #c0392b;
    --color-success: #27ae60;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --shadow-card: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-card-hover: 0 4px 12px rgba(0,0,0,0.1);
    --transition: 0.2s ease;
    --font: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    min-height: 100vh;
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    display: block;
    max-width: 100%;
    height: auto;
}

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

/* ============================================================
   LOGIN PAGE
   ============================================================ */

.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 1.5rem;
}

.login-container {
    width: 100%;
    max-width: 360px;
}

.login-title {
    font-size: 1.75rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 2rem;
    letter-spacing: -0.02em;
}

.login-form {
    background: var(--color-surface);
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
}

.login-error {
    color: var(--color-error);
    font-size: 0.875rem;
    margin-bottom: 1rem;
    text-align: center;
}

/* ============================================================
   HEADER
   ============================================================ */

.site-header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.875rem 1rem;
    max-width: 1200px;
    margin: 0 auto;
}

.site-logo {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.header-nav {
    display: none;
    gap: 0.25rem;
}

.header-nav.is-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 0.5rem 1rem 1rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.nav-link {
    display: block;
    padding: 0.625rem 0.75rem;
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: background var(--transition);
}

.nav-link:hover, .nav-link:focus {
    background: var(--color-tag-bg);
}

.nav-link--muted {
    color: var(--color-text-muted);
}

/* Hamburger */
.nav-toggle {
    display: flex;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    margin-right: -0.5rem;
}

.nav-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--color-text);
    border-radius: 1px;
    transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

/* ============================================================
   MAIN CONTENT
   ============================================================ */

.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
}

/* ============================================================
   SEARCH & FILTERS (Gallery page)
   ============================================================ */

.controls {
    margin-bottom: 1.25rem;
}

.search-bar {
    position: relative;
    margin-bottom: 0.75rem;
}

.search-input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    font-size: 0.9375rem;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(45,45,45,0.08);
}

.search-icon {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    width: 18px;
    height: 18px;
    color: var(--color-text-muted);
    pointer-events: none;
}

.filter-section {
    margin-bottom: 0.5rem;
}

.filter-group-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin-bottom: 0.375rem;
    display: block;
}

.filter-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
}

.filter-chip {
    display: inline-flex;
    align-items: center;
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
    font-weight: 500;
    background: var(--color-tag-bg);
    color: var(--color-tag-text);
    border: none;
    border-radius: 100px;
    cursor: pointer;
    transition: background var(--transition), color var(--transition);
    -webkit-tap-highlight-color: transparent;
}

.filter-chip:hover {
    background: #ddddd6;
}

.filter-chip.is-active {
    background: var(--color-tag-active-bg);
    color: var(--color-tag-active-text);
}

.controls-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

/* ============================================================
   SHOE GALLERY
   ============================================================ */

.gallery {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
}

.shoe-card {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-card);
    transition: box-shadow var(--transition), transform var(--transition);
    cursor: pointer;
}

.shoe-card:hover {
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-2px);
}

.shoe-card__image-wrap {
    position: relative;
    padding-bottom: 100%; /* 1:1 aspect ratio */
    overflow: hidden;
    background: var(--color-tag-bg);
}

.shoe-card__image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.shoe-card:hover .shoe-card__image {
    transform: scale(1.03);
}

.shoe-card__info {
    padding: 0.625rem 0.75rem;
}

.shoe-card__brand {
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-text-muted);
    margin-bottom: 0.125rem;
}

.shoe-card__name {
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1.3;
    margin-bottom: 0.375rem;
}

.shoe-card__tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
}

.tag {
    display: inline-block;
    padding: 0.1875rem 0.5rem;
    font-size: 0.6875rem;
    font-weight: 500;
    background: var(--color-tag-bg);
    color: var(--color-tag-text);
    border-radius: 100px;
}

/* Empty state */
.gallery-empty {
    grid-column: 1 / -1;
    text-align: center;
    padding: 3rem 1rem;
    color: var(--color-text-muted);
}

.gallery-empty__icon {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
    opacity: 0.4;
}

.gallery-count {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-bottom: 0.75rem;
}

/* ============================================================
   DETAIL PAGE
   ============================================================ */

.detail {
    max-width: 600px;
    margin: 0 auto;
}

.detail__back {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-muted);
    margin-bottom: 1rem;
    transition: color var(--transition);
}

.detail__back:hover {
    color: var(--color-text);
}

.detail__image-wrap {
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--color-tag-bg);
    margin-bottom: 1.25rem;
}

.detail__image {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
}

.detail__brand {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin-bottom: 0.25rem;
}

.detail__name {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 0.75rem;
}

.detail__tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
    margin-bottom: 1.5rem;
}

.detail__meta {
    display: grid;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.detail__meta-item {
    display: flex;
    justify-content: space-between;
    padding: 0.625rem 0;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.9375rem;
}

.detail__meta-label {
    color: var(--color-text-muted);
    font-weight: 500;
}

.detail__notes {
    background: var(--color-tag-bg);
    padding: 1rem;
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.detail__actions {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

/* ============================================================
   FORMS
   ============================================================ */

.form-page {
    max-width: 600px;
    margin: 0 auto;
}

.form-page__title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.form-field {
    margin-bottom: 1.25rem;
}

.form-field label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 600;
    margin-bottom: 0.375rem;
    color: var(--color-text-muted);
}

.form-field input[type="text"],
.form-field input[type="number"],
.form-field input[type="date"],
.form-field input[type="password"],
.form-field textarea,
.form-field select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-surface);
    font-size: 0.9375rem;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.form-field input:focus,
.form-field textarea:focus,
.form-field select:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(45,45,45,0.08);
}

.form-field textarea {
    min-height: 100px;
    resize: vertical;
}

.form-field-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.form-field-row--thirds {
    grid-template-columns: 1fr 1fr 1fr;
}

/* File upload */
.file-upload {
    position: relative;
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-md);
    padding: 2rem 1rem;
    text-align: center;
    cursor: pointer;
    transition: border-color var(--transition), background var(--transition);
}

.file-upload:hover, .file-upload.is-dragover {
    border-color: var(--color-accent);
    background: rgba(45,45,45,0.02);
}

.file-upload input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

.file-upload__label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.file-upload__preview {
    max-width: 200px;
    margin: 0.75rem auto 0;
    border-radius: var(--radius-sm);
    display: none;
}

.file-upload__preview.is-visible {
    display: block;
}

/* Category multi-select in forms */
.category-select {
    margin-bottom: 0.75rem;
}

.category-select__group-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin-bottom: 0.375rem;
    display: block;
}

.category-select__chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
}

/* ============================================================
   CATEGORY MANAGEMENT PAGE
   ============================================================ */

.category-manager {
    max-width: 600px;
    margin: 0 auto;
}

.category-group {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    padding: 1rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow-card);
}

.category-group__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}

.category-group__name {
    font-size: 1rem;
    font-weight: 600;
}

.category-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
    margin-bottom: 0.75rem;
}

.category-item {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.375rem 0.5rem 0.375rem 0.75rem;
    background: var(--color-tag-bg);
    border-radius: 100px;
    font-size: 0.8125rem;
}

.category-item__delete {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    background: none;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    transition: background var(--transition), color var(--transition);
}

.category-item__delete:hover {
    background: var(--color-error);
    color: white;
}

.category-add {
    display: flex;
    gap: 0.5rem;
}

.category-add input {
    flex: 1;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
}

.category-add input:focus {
    outline: none;
    border-color: var(--color-accent);
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.375rem;
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition), color var(--transition), transform 0.1s ease;
    -webkit-tap-highlight-color: transparent;
    min-height: 44px; /* Touch target */
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background: var(--color-accent);
    color: white;
}

.btn-primary:hover {
    background: var(--color-accent-hover);
}

.btn-secondary {
    background: var(--color-tag-bg);
    color: var(--color-text);
}

.btn-secondary:hover {
    background: #ddddd6;
}

.btn-danger {
    background: var(--color-error);
    color: white;
}

.btn-danger:hover {
    background: #a93226;
}

.btn-outline-danger {
    background: transparent;
    color: var(--color-error);
    border: 1px solid var(--color-error);
}

.btn-outline-danger:hover {
    background: var(--color-error);
    color: white;
}

.btn-small {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
    min-height: 36px;
}

.btn-full {
    width: 100%;
}

/* ============================================================
   UTILITIES
   ============================================================ */

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
    border: 0;
}

.toast {
    position: fixed;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: 0.75rem 1.25rem;
    background: var(--color-accent);
    color: white;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    box-shadow: 0 4px 16px rgba(0,0,0,0.2);
    z-index: 1000;
    opacity: 0;
    transition: transform 0.3s ease, opacity 0.3s ease;
    pointer-events: none;
}

.toast.is-visible {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast--error {
    background: var(--color-error);
}

.toast--success {
    background: var(--color-success);
}

/* Confirm dialog overlay */
.confirm-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    padding: 1rem;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease;
}

.confirm-overlay.is-visible {
    opacity: 1;
    visibility: visible;
}

.confirm-dialog {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    max-width: 360px;
    width: 100%;
    box-shadow: 0 8px 30px rgba(0,0,0,0.15);
}

.confirm-dialog__title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.confirm-dialog__text {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    margin-bottom: 1.25rem;
    line-height: 1.5;
}

.confirm-dialog__actions {
    display: flex;
    gap: 0.5rem;
    justify-content: flex-end;
}

/* ============================================================
   RESPONSIVE: Tablet and up
   ============================================================ */

@media (min-width: 640px) {
    .main-content {
        padding: 1.5rem;
    }

    .gallery {
        grid-template-columns: repeat(3, 1fr);
        gap: 1rem;
    }

    .header-nav {
        display: flex;
        flex-direction: row;
    }

    .nav-toggle {
        display: none;
    }
}

/* ============================================================
   RESPONSIVE: Desktop
   ============================================================ */

@media (min-width: 1024px) {
    .gallery {
        grid-template-columns: repeat(4, 1fr);
    }
}