/* ============================================================
   GESPROJ — Premium Design System
   CSS Custom Properties (Design Tokens) + Component Styles
   ============================================================ */

/* --- Design Tokens --- */
:root {
    /* Brand — Gradient-ready */
    --color-brand: #3b82f6;
    --color-brand-hover: #2563eb;
    --color-brand-light: #dbeafe;
    --color-brand-start: #3b82f6;
    --color-brand-end: #6366f1;
    --gradient-brand: linear-gradient(135deg, var(--color-brand-start), var(--color-brand-end));
    --gradient-brand-subtle: linear-gradient(135deg, rgba(59,130,246,0.08), rgba(99,102,241,0.08));

    /* Status */
    --color-done: #22c55e;
    --color-done-bg: #dcfce7;
    --color-progress: #f59e0b;
    --color-progress-bg: #fef3c7;
    --color-todo: #ef4444;
    --color-todo-bg: #fee2e2;
    --color-hold: #8b5cf6;
    --color-hold-bg: #ede9fe;
    --color-cancelled: #6b7280;
    --color-cancelled-bg: #f3f4f6;
    --color-none: #d1d5db;

    /* Neutrals */
    --color-bg: #f1f5f9;
    --color-surface: #ffffff;
    --color-surface-alt: #f8fafc;
    --color-border: #e2e8f0;
    --color-border-hover: #cbd5e1;
    --color-text: #0f172a;
    --color-text-secondary: #475569;
    --color-text-muted: #94a3b8;

    /* Feedback */
    --color-success: #22c55e;
    --color-success-bg: #dcfce7;
    --color-error: #ef4444;
    --color-error-bg: #fee2e2;
    --color-warning: #f59e0b;
    --color-warning-bg: #fef3c7;
    --color-info: #3b82f6;
    --color-info-bg: #dbeafe;

    /* Actions */
    --color-danger: #dc2626;
    --color-danger-hover: #b91c1c;
    --color-secondary: #64748b;
    --color-secondary-hover: #475569;
    --color-archive: #64748b;

    /* Spacing (4px grid) */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;

    /* Typography — Inter (Google Fonts) */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --line-height: 1.6;

    /* Borders — rounder = friendlier */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 10px;
    --radius-xl: 14px;

    /* Shadows — 4-tier layered depth */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04), 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.04), 0 4px 8px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 4px 8px rgba(0, 0, 0, 0.04), 0 8px 24px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 8px 16px rgba(0, 0, 0, 0.06), 0 16px 48px rgba(0, 0, 0, 0.1);

    /* Transitions & Easing */
    --transition-fast: 150ms var(--ease-out);
    --transition-base: 250ms var(--ease-out);
    --transition-slow: 350ms var(--ease-out);
    --ease-out: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

    /* Touch targets */
    --touch-target: 44px;
    --drag-handle-size: 48px;

    /* Layout */
    --header-height: 56px;
    --sidebar-width: 280px;
    --container-max: 1200px;
    --phase-width: 320px;
}

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

html {
    scroll-behavior: smooth;
}

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

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

/* --- Layout --- */
.container {
    max-width: var(--container-max);
    margin: var(--space-5) auto;
    background: var(--color-surface);
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

/* Full-width mode for project view */
.container--full {
    max-width: none;
    width: 100%;
    border-radius: 0;
    box-shadow: none;
    margin: 0;
    padding: var(--space-4) var(--space-6);
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
    color: var(--color-text);
    line-height: 1.3;
}
h1 {
    font-size: var(--font-size-2xl);
    text-align: center;
    margin-bottom: var(--space-5);
}
h2 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-4);
}

/* --- Status Badges --- */
.status-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: 3px var(--space-3);
    border-radius: 9999px;
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    white-space: nowrap;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.status-badge:hover {
    transform: scale(1.05);
}
.status-badge::before {
    content: '';
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}
.status-badge--done { background: var(--color-done-bg); color: #166534; }
.status-badge--done::before { background: var(--color-done); }
.status-badge--progress { background: var(--color-progress-bg); color: #92400e; }
.status-badge--progress::before { background: var(--color-progress); }
.status-badge--todo { background: var(--color-todo-bg); color: #991b1b; }
.status-badge--todo::before { background: var(--color-todo); }
.status-badge--hold { background: var(--color-hold-bg); color: #5b21b6; }
.status-badge--hold::before { background: var(--color-hold); }
.status-badge--cancelled { background: var(--color-cancelled-bg); color: #374151; }
.status-badge--cancelled::before { background: var(--color-cancelled); }

/* --- Project List --- */
.project-list {
    list-style: none;
    padding: 0;
    display: grid;
    gap: var(--space-3);
}
.project-item {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    padding: var(--space-4);
    border-radius: var(--radius-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: box-shadow var(--transition-fast), border-color var(--transition-fast);
}
.project-item:hover {
    border-color: var(--color-brand);
    box-shadow: var(--shadow-md);
}
.project-item a {
    font-weight: 600;
    color: var(--color-text);
}
.project-item a:hover {
    color: var(--color-brand);
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: background-color var(--transition-fast), box-shadow var(--transition-fast);
    text-decoration: none;
    min-height: var(--touch-target);
    line-height: 1;
}
.btn--primary {
    background: var(--gradient-brand);
    color: white;
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.25);
}
.btn--primary:hover {
    background: var(--gradient-brand);
    filter: brightness(1.1);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.35);
    color: white;
}
.btn--danger {
    background-color: var(--color-danger);
    color: white;
}
.btn--danger:hover {
    background-color: var(--color-danger-hover);
    color: white;
}
.btn--secondary {
    background-color: var(--color-secondary);
    color: white;
}
.btn--secondary:hover {
    background-color: var(--color-secondary-hover);
    color: white;
}
.btn--ghost {
    background: transparent;
    color: var(--color-text-secondary);
    padding: var(--space-1) var(--space-2);
    min-height: auto;
}
.btn--ghost:hover {
    background: var(--color-bg);
    color: var(--color-text);
}
.btn--block {
    display: flex;
    width: 100%;
    text-align: center;
}
.btn--sm {
    padding: var(--space-1) var(--space-2);
    font-size: var(--font-size-xs);
    min-height: 32px;
}

/* Legacy button compat */
.create-project-link {
    display: block;
    text-align: center;
    margin-top: var(--space-3);
    padding: var(--space-3) var(--space-4);
    background-color: var(--color-brand);
    color: white;
    border-radius: var(--radius-sm);
    font-weight: 500;
    transition: background-color var(--transition-fast);
}
.create-project-link:hover {
    background-color: var(--color-brand-hover);
    color: white;
}
.delete-button {
    background-color: var(--color-danger);
    color: white;
    padding: var(--space-1) var(--space-3);
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: var(--font-size-sm);
    transition: background-color var(--transition-fast);
}
.delete-button:hover {
    background-color: var(--color-danger-hover);
}

/* --- Messages / Alerts --- */
.message {
    padding: var(--space-3) var(--space-4);
    margin: var(--space-4) 0;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    font-size: var(--font-size-sm);
}
.message.success {
    background-color: var(--color-success-bg);
    color: #166534;
    border-color: #bbf7d0;
}
.message.error {
    background-color: var(--color-error-bg);
    color: #991b1b;
    border-color: #fecaca;
}
.message.info {
    background-color: var(--color-info-bg);
    color: #1e40af;
    border-color: #93c5fd;
}

/* --- Phases (Kanban Columns) --- */
.phases-section {
    margin-top: var(--space-6);
    border-top: 1px solid var(--color-border);
    padding-top: var(--space-5);
}
.phases-container {
    display: flex;
    overflow-x: auto;
    padding-bottom: var(--space-5);
    gap: var(--space-5);
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
}
.phase-column {
    flex: 0 0 var(--phase-width);
    background: var(--color-surface-alt);
    padding: var(--space-4);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.phase-column:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-border-hover);
}
.phase-column.sortable-ghost {
    opacity: 0.5;
    border: 2px dashed var(--color-brand);
}
.phase-column.sortable-chosen {
    box-shadow: var(--shadow-xl);
}
.phase-column h4 {
    margin: 0 0 var(--space-2);
    color: var(--color-text);
    font-size: var(--font-size-base);
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--space-2);
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.phase-column p {
    margin: 0 0 var(--space-2);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}
.phase-column small {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

/* Phase progress bar */
.phase-progress {
    height: 4px;
    background: var(--color-border);
    border-radius: 2px;
    margin: var(--space-2) 0;
    overflow: hidden;
}
.phase-progress__bar {
    height: 100%;
    background: var(--color-done);
    border-radius: 2px;
    transition: width var(--transition-base);
}

/* --- Steps (Cards) --- */
.steps-list {
    list-style: none;
    padding: 0;
    margin: 0;
    flex-grow: 1;
    min-height: var(--space-12);
}
.step-item {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    padding: var(--space-3) var(--space-4);
    margin-bottom: var(--space-2);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
    cursor: default;
    position: relative;
}
.step-item:hover {
    border-color: var(--color-brand);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}
.step-item.sortable-ghost {
    opacity: 0.4;
    border: 2px dashed var(--color-brand);
}
.step-item.sortable-chosen {
    box-shadow: var(--shadow-lg);
    z-index: 10;
}
.step-item h6 {
    margin: 0 0 var(--space-1);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text);
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.step-item p {
    margin: 0 0 var(--space-1);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}
.step-item small {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

/* Step drop zone highlight */
.steps-list.drop-zone-active {
    border: 2px dashed var(--color-brand);
    background: var(--color-brand-light);
    border-radius: var(--radius-md);
    min-height: 80px;
}

/* --- Drag Handle --- */
.drag-handle {
    cursor: grab;
    color: var(--color-text-muted);
    padding: var(--space-1);
    font-size: var(--font-size-lg);
    line-height: 1;
    min-width: var(--touch-target);
    min-height: var(--touch-target);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    user-select: none;
    -webkit-user-select: none;
}
.drag-handle:hover {
    color: var(--color-text);
}
.drag-handle:active {
    cursor: grabbing;
}

/* --- Icon Group (Edit/Duplicate/Archive) --- */
.icon-group {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
}
.icon-group a,
.icon-group span {
    color: var(--color-text-muted);
    font-size: var(--font-size-base);
    transition: color var(--transition-fast);
    cursor: pointer;
    min-width: var(--touch-target);
    min-height: var(--touch-target);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
.icon-edit:hover { color: var(--color-brand); }
.icon-duplicate:hover { color: var(--color-secondary); }
.icon-archive:hover { color: var(--color-danger); }

/* --- Inline Editing --- */
.editable {
    cursor: text;
    border-radius: var(--radius-sm);
    padding: 2px var(--space-1);
    transition: background-color var(--transition-fast), box-shadow var(--transition-fast);
}
.editable:hover {
    background-color: var(--color-brand-light);
}
.editable[contenteditable="true"] {
    background-color: var(--color-surface);
    outline: none;
    box-shadow: 0 0 0 2px var(--color-brand), 0 0 0 4px var(--color-brand-light);
}
.editable--saving {
    background-color: var(--color-progress-bg) !important;
}
.editable--saved {
    background-color: var(--color-done-bg) !important;
}

/* --- Edit Button (Touch Fallback) --- */
.edit-btn-touch {
    display: none;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-brand);
    padding: var(--space-1);
    min-width: var(--touch-target);
    min-height: var(--touch-target);
    cursor: pointer;
    align-items: center;
    justify-content: center;
}

/* --- File Drop Zone --- */
.drop-zone {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-6);
    text-align: center;
    color: var(--color-text-muted);
    transition: border-color var(--transition-fast), background-color var(--transition-fast);
    cursor: pointer;
}
.drop-zone:hover,
.drop-zone--dragover {
    border-color: var(--color-brand);
    background-color: var(--color-brand-light);
    color: var(--color-brand);
}
.drop-zone__icon {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--space-2);
}
.drop-zone__text {
    font-size: var(--font-size-sm);
}
.drop-zone__input {
    display: none;
}

/* --- File List --- */
.file-list {
    list-style: none;
    padding: 0;
    display: grid;
    gap: var(--space-2);
}
.file-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    background: var(--color-surface-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
}
.file-item__icon {
    font-size: var(--font-size-xl);
    color: var(--color-text-muted);
    flex-shrink: 0;
}
.file-item__name {
    flex: 1;
    font-size: var(--font-size-sm);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.file-item__actions {
    display: flex;
    gap: var(--space-1);
}

/* --- Thumbnail --- */
.thumbnail {
    width: 270px;
    border-radius: var(--radius-sm);
    margin: var(--space-1);
}
.thumbnail-small {
    width: 100px;
    border-radius: var(--radius-sm);
    margin: var(--space-1);
}

/* --- Forms --- */
.form-group {
    margin-bottom: var(--space-4);
}
.form-group label {
    display: block;
    margin-bottom: var(--space-1);
    font-weight: 600;
    font-size: var(--font-size-sm);
    color: var(--color-text);
}
.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="date"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--space-2) var(--space-3);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--color-text);
    background: var(--color-surface);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-brand);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}
.form-group textarea {
    min-height: 80px;
    resize: vertical;
}
.form-group input[type="checkbox"] {
    margin-right: var(--space-2);
    vertical-align: middle;
}

input[type="submit"],
.create-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3) var(--space-4);
    background-color: var(--color-brand);
    color: white;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: 500;
    text-decoration: none;
    transition: background-color var(--transition-fast);
    min-height: var(--touch-target);
}
input[type="submit"]:hover,
.create-link:hover {
    background-color: var(--color-brand-hover);
}

/* --- Links --- */
.back-link {
    display: block;
    text-align: center;
    margin-top: var(--space-6);
    padding: var(--space-3);
    color: var(--color-brand);
    background-color: var(--color-surface-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-weight: 500;
    transition: background-color var(--transition-fast);
}
.back-link:hover {
    background-color: var(--color-border);
    color: var(--color-text);
}

.add-step-link {
    display: block;
    text-align: center;
    margin-top: var(--space-3);
    padding: var(--space-2);
    background-color: var(--color-done);
    color: white;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    transition: background-color var(--transition-fast);
}
.add-step-link:hover {
    background-color: #16a34a;
    color: white;
}

/* --- Project Actions --- */
.project-actions {
    text-align: right;
    margin-bottom: var(--space-5);
    display: flex;
    justify-content: flex-end;
    gap: var(--space-2);
}
.project-details p {
    margin-bottom: var(--space-3);
    background: var(--color-surface-alt);
    padding: var(--space-3);
    border-radius: var(--radius-sm);
}
.project-details strong {
    color: var(--color-text-secondary);
}

/* --- Chat Panel --- */
.chat-panel {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-top: var(--space-6);
}
.chat-panel__header {
    background: var(--color-surface-alt);
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--color-border);
    font-weight: 600;
}
.chat-panel__messages {
    max-height: 400px;
    overflow-y: auto;
    padding: var(--space-4);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}
.chat-message {
    padding: var(--space-2) var(--space-3);
    background: var(--color-surface-alt);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
}
.chat-message__author {
    font-weight: 600;
    font-size: var(--font-size-xs);
    color: var(--color-brand);
}
.chat-message__time {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}
.chat-panel__input {
    display: flex;
    border-top: 1px solid var(--color-border);
}
.chat-panel__input input {
    flex: 1;
    border: none;
    padding: var(--space-3) var(--space-4);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
}
.chat-panel__input input:focus {
    outline: none;
}
.chat-panel__input button {
    padding: var(--space-3) var(--space-4);
    background: var(--color-brand);
    color: white;
    border: none;
    cursor: pointer;
    font-weight: 600;
}

/* --- Sticky Note --- */
.sticky-note {
    background: #fef3c7;
    border-left: 4px solid var(--color-progress);
    border-radius: var(--radius-sm);
    padding: var(--space-3);
    margin-bottom: var(--space-2);
    font-size: var(--font-size-sm);
    position: relative;
}
.sticky-note--unread {
    border-left-color: var(--color-brand);
    background: var(--color-brand-light);
}
.sticky-note__dismiss {
    position: absolute;
    top: var(--space-1);
    right: var(--space-1);
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text-muted);
    font-size: var(--font-size-base);
}

/* --- Activity Feed --- */
.activity-feed {
    list-style: none;
    padding: 0;
}
.activity-item {
    display: flex;
    gap: var(--space-3);
    padding: var(--space-3) 0;
    border-bottom: 1px solid var(--color-border);
    font-size: var(--font-size-sm);
}
.activity-item:last-child {
    border-bottom: none;
}
.activity-item__icon {
    color: var(--color-text-muted);
    flex-shrink: 0;
}
.activity-item__time {
    color: var(--color-text-muted);
    font-size: var(--font-size-xs);
    flex-shrink: 0;
}

/* --- Upload Progress --- */
.upload-progress {
    height: 4px;
    background: var(--color-border);
    border-radius: 2px;
    overflow: hidden;
    margin-top: var(--space-2);
}
.upload-progress__bar {
    height: 100%;
    background: var(--color-brand);
    border-radius: 2px;
    width: 0%;
    transition: width var(--transition-base);
}

/* --- Canvas Wrapper --- */
.canvas-wrapper {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin: var(--space-4) 0;
}
.canvas-toolbar {
    display: flex;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    background: var(--color-surface-alt);
    border-bottom: 1px solid var(--color-border);
    flex-wrap: wrap;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .phases-container {
        flex-direction: column;
        align-items: stretch;
    }
    .phase-column {
        flex: 1 1 auto;
    }
    .container {
        margin: var(--space-2);
        padding: var(--space-4);
    }
    .edit-btn-touch {
        display: inline-flex;
    }
}

@media (max-width: 768px) {
    :root {
        --phase-width: 100%;
    }
    h1 {
        font-size: var(--font-size-xl);
    }
    .container {
        margin: 0;
        padding: var(--space-3);
        border-radius: 0;
    }
    .icon-group a,
    .icon-group span {
        font-size: var(--font-size-lg);
    }
    .thumbnail {
        width: 100%;
        max-width: 270px;
    }
}

/* --- Utility Classes --- */
.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;
}
.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.text-sm { font-size: var(--font-size-sm); }
.text-xs { font-size: var(--font-size-xs); }
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.flex { display: flex; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.hidden { display: none !important; }
.form--narrow { max-width: 600px; }
.icon-muted { opacity: 0.4; }

/* --- Keyframes --- */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

@keyframes liftUp {
    from { transform: translateY(0); }
    to { transform: translateY(-2px); }
}

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

/* --- Animation Utility Classes --- */
.hover-lift {
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.hover-lift:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.fade-in {
    animation: fadeIn var(--transition-base) var(--ease-out);
}

.slide-in {
    animation: slideIn var(--transition-base) var(--ease-out);
}

.pulse {
    animation: pulse 2s var(--ease-out) infinite;
}

/* Skeleton loading placeholder */
.skeleton {
    background: linear-gradient(90deg, var(--color-border) 25%, var(--color-surface-alt) 50%, var(--color-border) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-sm);
}

/* --- Glassmorphism --- */
.glass {
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.glass--dark {
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    background: rgba(15, 23, 42, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* --- Component Classes (inline style migration) --- */
.btn--archive {
    background-color: var(--color-archive);
    color: white;
}
.btn--archive:hover {
    background-color: var(--color-secondary-hover);
    color: white;
}

.btn--warning {
    background-color: #eab308;
    color: white;
}
.btn--warning:hover {
    background-color: #ca8a04;
    color: white;
}

.project-item__thumb {
    width: 150px;
    border-radius: var(--radius-sm);
    margin-right: var(--space-4);
    object-fit: cover;
}

.project-item__date {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

.section-divider {
    border: none;
    height: 1px;
    background: var(--color-border);
    margin: var(--space-8) 0;
}

/* --- Auth Pages (Login / Register) --- */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-brand-subtle);
    padding: var(--space-4);
}

.auth-card {
    width: 100%;
    max-width: 420px;
    background: var(--color-surface);
    padding: var(--space-8);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    animation: slideIn var(--transition-slow) var(--ease-out);
}

.auth-card h1 {
    text-align: center;
    margin-bottom: var(--space-6);
    font-size: var(--font-size-2xl);
    font-weight: 700;
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.auth-card .form-group {
    margin-bottom: var(--space-4);
}

.auth-card .form-group label {
    display: block;
    margin-bottom: var(--space-1);
    font-weight: 500;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.auth-card .form-group input[type="text"],
.auth-card .form-group input[type="password"] {
    width: 100%;
    padding: var(--space-3);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--color-text);
    background: var(--color-surface);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.auth-card .form-group input:focus {
    outline: none;
    border-color: var(--color-brand);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.auth-card button[type="submit"],
.auth-card input[type="submit"] {
    width: 100%;
    padding: var(--space-3);
    background: var(--gradient-brand);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: filter var(--transition-fast), box-shadow var(--transition-fast);
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.25);
    min-height: var(--touch-target);
}

.auth-card button[type="submit"]:hover,
.auth-card input[type="submit"]:hover {
    filter: brightness(1.1);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.35);
}

.auth-card .auth-link {
    text-align: center;
    margin-top: var(--space-5);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.auth-card .auth-link a {
    color: var(--color-brand);
    font-weight: 500;
}

.auth-card .message.error {
    margin-bottom: var(--space-4);
}

/* --- Dark Mode Preparation --- */
[data-theme="dark"] {
    --color-bg: #0f172a;
    --color-surface: #1e293b;
    --color-surface-alt: #283548;
    --color-border: #334155;
    --color-border-hover: #475569;
    --color-text: #e2e8f0;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;
    --color-brand-light: rgba(59, 130, 246, 0.15);
    --gradient-brand-subtle: linear-gradient(135deg, rgba(59,130,246,0.04), rgba(99,102,241,0.04));

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2), 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.2), 0 4px 8px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 4px 8px rgba(0, 0, 0, 0.2), 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 8px 16px rgba(0, 0, 0, 0.3), 0 16px 48px rgba(0, 0, 0, 0.5);
}