/* ========================================
   BASE: Reset & Root Variables
   ======================================== */

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

:root {
    /* Colors */
    --color-black: #000000;
    --color-dark: #0a0a0a;
    --color-darker: #050505;
    --color-sidebar: #0a0a0a;
    --color-card: #0f0f0f;
    --color-accent: #9f7aea;
    --color-accent-light: #a78bfa;
    --color-accent-dark: #8b5cf6;
    --color-text: #e5e5e5;
    --color-text-muted: #a3a3a3;
    --color-border: #1a1a1a;
    --color-border-glow: rgba(159, 122, 234, 0.1);
    --color-accent-glow: rgba(159, 122, 234, 0.4);
    --color-error: #ef4444;
    --color-success: #10b981;

    /* Gradients */
    --gradient-accent: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
    --gradient-logo: linear-gradient(135deg, var(--color-text) 0%, var(--color-accent-light) 100%);
    --gradient-scrollbar: linear-gradient(180deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
    --gradient-scrollbar-hover: linear-gradient(180deg, var(--color-accent-light) 0%, var(--color-accent) 100%);

    /* Shadows */
    --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.6);
    --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.7);
    --shadow-xl: 0 25px 60px rgba(0, 0, 0, 0.8);
    --shadow-glow: 0 0 40px rgba(159, 122, 234, 0.25);

    /* Spacing Scale */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 12px;
    --space-lg: 16px;
    --space-xl: 24px;
    --space-2xl: 40px;

    /* Typography */
    --font-size-xs: 11px;
    --font-size-sm: 12px;
    --font-size-base: 14px;
    --font-size-md: 16px;
    --font-size-lg: 20px;
    --font-size-xl: 24px;
    --font-weight-normal: 600;
    --font-weight-bold: 700;

    /* Z-Index */
    --z-base: 1;
    --z-sidebar-backdrop: 85;
    --z-sidebar: 90;
    --z-header: 100;
    --z-fab: 50;
    --z-modal-backdrop: 999;
    --z-modal: 1000;
    --z-modal-content: 1001;
    --z-toast: 2000;

    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s ease-in-out;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--color-black);
    color: var(--color-text);
    overflow-x: hidden;
    min-height: 100vh;
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-dark);
}

::-webkit-scrollbar-thumb {
    background: var(--gradient-scrollbar);
    border-radius: 4px;
}

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

/* ========================================
   LAYOUT: Header
   ======================================== */

.header {
    background: rgba(10, 10, 10, 0.6);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border-glow);
    padding: var(--space-lg) 0;
    position: sticky;
    top: 0;
    z-index: var(--z-header);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-xl);
}

.sidebar-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--color-text);
    cursor: pointer;
    padding: var(--space-sm);
    border-radius: 8px;
    transition: var(--transition);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sidebar-toggle:hover {
    background: var(--color-border-glow);
    color: var(--color-accent);
}

.sidebar-toggle i {
    width: 24px;
    height: 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex-shrink: 0;
}

.logo-icon {
    font-size: var(--font-size-xl);
    animation: float 3s ease-in-out infinite;
    color: var(--color-accent);
}

.logo-icon i {
    width: 24px;
    height: 24px;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-4px); }
}

.logo h1 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    background: var(--gradient-logo);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.search-container {
    position: relative;
    flex: 1;
    max-width: 400px;
}

.search-input {
    width: 100%;
    padding: 10px var(--space-lg) 10px 36px;
    background: rgba(20, 20, 20, 0.8);
    border: 1px solid var(--color-border-glow);
    border-radius: 8px;
    color: var(--color-text);
    font-size: var(--font-size-base);
    transition: var(--transition);
}

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

.search-input:focus {
    outline: none;
    border-color: var(--color-accent);
    background: rgba(15, 15, 15, 0.9);
    box-shadow: 0 0 25px var(--color-accent-glow);
}

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

/* ========================================
   LAYOUT: Sidebar
   ======================================== */

.sidebar {
    position: fixed;
    left: 0;
    top: 61px;
    width: 240px;
    height: calc(100vh - 61px);
    background: var(--color-sidebar);
    border-right: 1px solid var(--color-border-glow);
    box-shadow: 8px 0 32px rgba(0, 0, 0, 0.5);
    overflow-y: auto;
    padding: var(--space-xl) 0;
    z-index: var(--z-sidebar);
    transition: width 0.3s var(--transition);
}

.sidebar.collapsed {
    width: 60px;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    padding: 0 var(--space-md);
}

.sidebar-item {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    padding: var(--space-md) var(--space-lg);
    background: none;
    border: none;
    border-left: 3px solid transparent;
    color: var(--color-text-muted);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    cursor: pointer;
    border-radius: 8px;
    transition: var(--transition);
    position: relative;
}

.sidebar-item i {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.sidebar-item:hover {
    color: var(--color-accent);
    background: rgba(159, 122, 234, 0.08);
}

.sidebar-item.active {
    color: var(--color-accent);
    border-left-color: var(--color-accent);
    background: rgba(159, 122, 234, 0.12);
}

.sidebar.collapsed .sidebar-label {
    display: none;
}

.sidebar-label {
    white-space: nowrap;
}

.sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: var(--z-sidebar-backdrop);
}

/* ========================================
   LAYOUT: Main Content
   ======================================== */

.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
}

.main-content {
    flex: 1;
    width: 100%;
    margin-left: 240px;
    padding: var(--space-2xl);
    transition: margin-left 0.3s var(--transition);
}

.sidebar.collapsed ~ .main-content {
    margin-left: 60px;
}

.content-wrapper {
    position: relative;
}

.category-section {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

.category-section.active {
    display: block;
}

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

/* ========================================
   COMPONENTS: Grid & Cards
   ======================================== */

.prompts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-xl);
    margin-bottom: var(--space-2xl);
}

.prompt-card {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: var(--space-xl);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    box-shadow: var(--shadow-md);
}

.prompt-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-accent) 0%, transparent 100%);
    opacity: 0;
    transition: var(--transition);
}

.prompt-card:hover {
    border-color: var(--color-border-glow);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    transform: translateY(-6px);
}

.prompt-card:hover::before {
    opacity: 1;
}

.prompt-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-md);
}

.prompt-title {
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    word-break: break-word;
    flex: 1;
}

.prompt-provider {
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    background: var(--gradient-accent);
    color: white;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-normal);
    border-radius: 20px;
    white-space: nowrap;
    flex-shrink: 0;
}

.prompt-content {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    word-break: break-word;
    flex: 1;
}

.prompt-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.tag {
    display: inline-block;
    padding: var(--space-xs) 10px;
    background: var(--color-dark);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    transition: var(--transition);
}

.tag:hover {
    border-color: var(--color-accent);
    color: var(--color-accent-light);
}

.prompt-footer {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-sm);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border);
}

.icon-btn {
    flex: 1;
    padding: 10px var(--space-md);
    background: var(--color-dark);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    color: var(--color-text-muted);
    cursor: pointer;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-normal);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
}

.icon-btn i {
    width: 16px;
    height: 16px;
}

.icon-btn:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
    box-shadow: 0 4px 12px rgba(159, 122, 234, 0.3);
}

.icon-btn.danger:hover {
    background: var(--color-error);
    border-color: var(--color-error);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

/* ========================================
   COMPONENTS: Empty State & FAB
   ======================================== */

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px var(--space-lg);
    text-align: center;
}

.empty-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 20px;
    opacity: 0.3;
    color: var(--color-accent);
}

.empty-icon i {
    width: 64px;
    height: 64px;
}

.empty-state h3 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-sm);
    color: var(--color-text);
}

.empty-state p {
    font-size: var(--font-size-base);
    color: var(--color-text-muted);
}

.fab {
    position: fixed;
    bottom: var(--space-2xl);
    right: var(--space-2xl);
    width: 60px;
    height: 60px;
    background: var(--gradient-accent);
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-xl), var(--shadow-glow);
    transition: var(--transition);
    z-index: var(--z-fab);
}

.fab i {
    width: 28px;
    height: 28px;
}

.fab:hover {
    transform: scale(1.1) translateY(-4px);
    box-shadow: var(--shadow-xl), 0 0 50px var(--color-accent-glow);
}

.fab:active {
    transform: scale(0.95);
}

/* ========================================
   COMPONENTS: Modal & Forms
   ======================================== */

.modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: var(--z-modal);
    animation: fadeIn 0.3s ease-in-out;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    z-index: var(--z-modal-backdrop);
}

.modal-content {
    background: var(--color-card);
    border: 1px solid var(--color-border-glow);
    border-radius: 16px;
    box-shadow: var(--shadow-xl);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp 0.3s ease-in-out;
    z-index: var(--z-modal-content);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-confirm {
    max-width: 400px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 32px;
}

.modal-confirm h3 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-md);
}

.modal-confirm p {
    font-size: var(--font-size-base);
    color: var(--color-text-muted);
    margin-bottom: var(--space-xl);
}

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

.modal-header h2 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
}

.modal-close {
    background: none;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    transition: var(--transition);
}

.modal-close i {
    width: 20px;
    height: 20px;
}

.modal-close:hover {
    background: var(--color-border-glow);
    color: var(--color-accent);
}

.prompt-form {
    padding: var(--space-xl);
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.form-group label {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-normal);
    color: var(--color-text);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: var(--space-md) 14px;
    background: var(--color-dark);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    color: var(--color-text);
    font-size: var(--font-size-base);
    font-family: inherit;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    background: var(--color-darker);
    box-shadow: 0 0 20px rgba(139, 92, 246, 0.2);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
    font-family: 'Monaco', 'Courier New', monospace;
}

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

.btn-cancel,
.btn-submit,
.btn-danger {
    flex: 1;
    padding: var(--space-md) var(--space-lg);
    border: none;
    border-radius: 8px;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-cancel {
    background: var(--color-dark);
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
}

.btn-cancel:hover {
    background: var(--color-darker);
    border-color: var(--color-text-muted);
    color: var(--color-text);
}

.btn-submit {
    background: var(--gradient-accent);
    color: white;
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.3);
}

.btn-submit:hover {
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.4);
    transform: translateY(-2px);
}

.btn-danger {
    background: var(--color-error);
    color: white;
    box-shadow: 0 4px 15px rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
    box-shadow: 0 6px 20px rgba(239, 68, 68, 0.4);
    transform: translateY(-2px);
}

/* ========================================
   COMPONENTS: Notifications
   ======================================== */

.toast {
    position: fixed;
    bottom: 120px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-accent);
    color: white;
    padding: 14px var(--space-xl);
    border-radius: 8px;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease-in-out;
    z-index: var(--z-toast);
    max-width: 90%;
}

.toast.show {
    opacity: 1;
    pointer-events: auto;
    animation: slideUp 0.3s ease-in-out;
}

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

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

/* ========================================
   RESPONSIVE: Tablet & Desktop
   ======================================== */

@media (max-width: 1024px) {
    .main-content {
        padding: var(--space-xl);
    }

    .prompts-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }

    .fab {
        bottom: var(--space-xl);
        right: var(--space-xl);
    }
}

/* ========================================
   RESPONSIVE: Tablet
   ======================================== */

@media (max-width: 768px) {
    .sidebar-toggle {
        display: flex !important;
    }

    .sidebar {
        width: 240px;
        left: -240px;
        transition: left 0.3s var(--transition);
    }

    .sidebar.open {
        left: 0;
    }

    .sidebar-backdrop {
        display: none;
    }

    .sidebar-backdrop.show {
        display: block;
    }

    .header-content {
        padding: 0 var(--space-lg);
        gap: var(--space-lg);
    }

    .logo h1 {
        font-size: var(--font-size-lg);
    }

    .search-container {
        max-width: 100%;
    }

    .main-content {
        margin-left: 0;
        padding: 20px;
    }

    .prompts-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    .fab {
        width: 50px;
        height: 50px;
        bottom: 20px;
        right: 20px;
    }

    .fab i {
        width: 24px;
        height: 24px;
    }

    .modal-content {
        max-width: 95%;
    }
}

/* ========================================
   RESPONSIVE: Mobile
   ======================================== */

@media (max-width: 480px) {
    .header-content {
        padding: 0 var(--space-md);
        gap: var(--space-md);
    }

    .logo h1 {
        font-size: 18px;
    }

    .search-input {
        font-size: var(--font-size-sm);
    }

    .main-content {
        padding: 16px;
    }

    .fab {
        width: 48px;
        height: 48px;
        bottom: 16px;
        right: 16px;
    }

    .prompt-card {
        padding: 16px;
    }
}