/* ===== CSS VARIABLES ===== */
:root {
    --primary: #6C63FF;
    --primary-light: #837dff;
    --primary-dark: #554fd2;
    --secondary: #FF6584;
    --secondary-light: #ff7a93;
    --accent: #36D1DC;
    --accent-light: #5dd8e3;
    --success: #4CAF50;
    --warning: #FF9800;
    --error: #F44336;
    --dark: #2A2A3C;
    --dark-light: #3d3d52;
    --light: #F8F9FC;
    --gray: #7B88A1;
    --gray-light: #e8eaf2;
    --white: #ffffff;
    --black: #000000;
    --shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 10px 25px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --border-radius: 12px;
    --border-radius-lg: 20px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
}

/* ===== RESET & BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background: #EBECFF;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ===== LOADING OVERLAY ===== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.95);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    opacity: 1;
    visibility: visible;
    transition: var(--transition);
}

.loading-overlay.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader {
    text-align: center;
    color: var(--primary);
}

.loader i {
    font-size: 3rem;
    animation: pulse 2s infinite;
    display: block;
    margin-bottom: var(--spacing-sm);
}

.loader span {
    font-size: 1.2rem;
    font-weight: 600;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.7; }
    50% { transform: scale(1.1); opacity: 1; }
}

/* ===== CONTAINER ===== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

/* ===== HEADER ===== */
header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

header h1 {
    color: var(--primary);
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    text-shadow: 0 2px 4px rgba(108, 99, 255, 0.3);
}

header h1 i {
    margin-right: var(--spacing-sm);
    color: var(--secondary);
}

header p {
    color: var(--gray);
    font-size: 1.2rem;
    margin-bottom: var(--spacing-lg);
}

/* Stats */
.stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.stat {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--light);
    border-radius: var(--border-radius);
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--gray);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ===== MODE SELECTOR ===== */
.mode-selector {
    display: flex;
    background: var(--light);
    border-radius: 50px;
    padding: 6px;
    margin-bottom: var(--spacing-xl);
    position: relative;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
    max-width: 100%;
    overflow: hidden;
}

.mode-btn {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    background: transparent;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    z-index: 2;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    color: var(--gray);
    white-space: nowrap;
    min-width: 0;
}

.mode-btn.active {
    color: var(--white);
}

.mode-btn:hover {
    transform: translateY(-2px);
}

.slider {
    position: absolute;
    height: calc(100% - 12px);
    width: calc(50% - 6px);
    background: linear-gradient(45deg, var(--primary), var(--primary-light));
    border-radius: 50px;
    top: 6px;
    left: 6px;
    transition: var(--transition);
    z-index: 1;
    box-shadow: var(--shadow);
}

.slider.advanced {
    left: calc(50%);
}

/* ===== GENERATOR SECTION ===== */
.generator {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}

.generator::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent));
}

.idea-display {
    min-height: 300px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-xl);
    background: var(--light);
    border-radius: var(--border-radius-lg);
    position: relative;
    overflow: hidden;
}

.idea-display::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: var(--transition);
}

.idea-display:hover::before {
    left: 100%;
}

.idea-image {
    width: 120px;
    height: 120px;
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--white);
    border-radius: 50%;
    font-size: 3rem;
    color: var(--primary);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.idea-image:hover {
    transform: rotate(10deg) scale(1.1);
}

.idea-text {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: var(--spacing-md);
    text-align: center;
    line-height: 1.4;
}

.idea-meta {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
    flex-wrap: wrap;
    justify-content: center;
}

.difficulty-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.difficulty-badge.simple {
    background: rgba(76, 175, 80, 0.15);
    color: var(--success);
    border: 2px solid rgba(76, 175, 80, 0.3);
}

.difficulty-badge.advanced {
    background: rgba(244, 67, 54, 0.15);
    color: var(--error);
    border: 2px solid rgba(244, 67, 54, 0.3);
}

.category-tag {
    background: var(--accent);
    color: var(--white);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 500;
}

/* ===== BUTTONS ===== */
.button-group {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-lg);
}

.btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    min-width: 160px;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: var(--transition);
}

.btn:hover::before {
    left: 100%;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

.btn-primary {
    background: linear-gradient(45deg, var(--primary), var(--primary-light));
    color: var(--white);
    box-shadow: 0 4px 15px rgba(108, 99, 255, 0.3);
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(45deg, var(--primary-dark), var(--primary));
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(108, 99, 255, 0.4);
}

.btn-secondary {
    background: var(--light);
    color: var(--dark);
    border: 2px solid var(--gray-light);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--gray-light);
    transform: translateY(-2px);
}

.btn-accent {
    background: linear-gradient(45deg, var(--accent), var(--accent-light));
    color: var(--white);
    box-shadow: 0 4px 15px rgba(54, 209, 220, 0.3);
}

.btn-accent:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(54, 209, 220, 0.4);
}

.btn-small {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.9rem;
    min-width: auto;
    border-radius: 20px;
    background: var(--gray-light);
    color: var(--gray);
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.btn-small:hover {
    background: var(--gray);
    color: var(--white);
}

/* ===== IDEA HISTORY ===== */
.idea-history {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--gray-light);
}

.idea-history h4 {
    color: var(--dark);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    max-height: 200px;
    overflow-y: auto;
}

.history-item {
    background: var(--light);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    color: var(--gray);
    cursor: pointer;
    transition: var(--transition);
}

.history-item:hover {
    background: var(--gray-light);
    color: var(--dark);
}

/* ===== FAVORITES SECTION ===== */
.favorites {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.section-header h3 {
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.favorites-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.favorites-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.favorite-item {
    background: var(--light);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.favorite-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.favorite-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
}

.favorite-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.favorite-text {
    flex: 1;
    font-size: 1rem;
    line-height: 1.4;
    color: var(--dark);
    margin-right: var(--spacing-sm);
}

.favorite-meta {
    display: flex;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-xs);
    font-size: 0.8rem;
}

.favorite-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.favorite-actions button {
    background: none;
    border: none;
    color: var(--gray);
    cursor: pointer;
    font-size: 1.1rem;
    transition: var(--transition);
    padding: var(--spacing-xs);
    border-radius: 50%;
}

.favorite-actions button:hover {
    background: rgba(244, 67, 54, 0.1);
    color: var(--error);
}

.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--gray);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

/* ===== CATEGORIES FILTER ===== */
.categories-filter {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow);
}

.categories-filter h4 {
    color: var(--dark);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.category-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.category-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--gray-light);
    background: var(--white);
    color: var(--gray);
    border-radius: 25px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.category-btn:hover,
.category-btn.active {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
    transform: translateY(-2px);
}

/* ===== FEATURES SECTION ===== */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.feature-card {
    background: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent));
    transform: scaleX(0);
    transition: var(--transition);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    filter: grayscale(0.3);
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    filter: grayscale(0);
    transform: scale(1.1);
}

.feature-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--dark);
}

.feature-desc {
    color: var(--gray);
    line-height: 1.6;
}

/* ===== TIPS SECTION ===== */
.tips-section {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow);
}

.tips-section h3 {
    color: var(--primary);
    margin-bottom: var(--spacing-lg);
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

.tips-carousel {
    position: relative;
    height: 100px;
    overflow: hidden;
}

.tip {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--light);
    border-radius: var(--border-radius);
    opacity: 0;
    transform: translateY(50px);
    transition: var(--transition);
}

.tip.active {
    opacity: 1;
    transform: translateY(0);
}

.tip i {
    font-size: 2rem;
    color: var(--accent);
}

.tip p {
    font-size: 1.1rem;
    color: var(--dark);
    text-align: center;
    max-width: 600px;
}

/* ===== FOOTER ===== */
footer {
    background: var(--dark);
    color: var(--white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-brand {
    text-align: left;
    justify-self: start;
}

.footer-brand h4 {
    color: var(--white);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.footer-brand p {
    color: var(--gray-light);
    font-size: 1rem;
    margin: 0;
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
    justify-self: center;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--primary);
    color: var(--white);
    border-radius: 50%;
    text-decoration: none;
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--primary-light);
    transform: translateY(-3px);
}

.footer-menu {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: var(--spacing-md);
    justify-self: end;
}

.footer-menu a {
    color: var(--white);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
    white-space: nowrap;
}

.footer-menu a:hover {
    color: var(--primary-light);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--dark-light);
    color: var(--gray-light);
    grid-column: 1 / -1;
}

/* ===== MODAL ===== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal.show {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    max-width: 500px;
    width: 90%;
    max-height: 80%;
    overflow-y: auto;
    transform: scale(0.7);
    transition: var(--transition);
}

.modal.show .modal-content {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--gray-light);
}

.modal-header h3 {
    color: var(--primary);
    margin: 0;
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--gray);
    cursor: pointer;
    transition: var(--transition);
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-btn:hover {
    background: var(--gray-light);
    color: var(--dark);
}

.share-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-md);
}

.share-btn {
    padding: var(--spacing-md);
    border: 2px solid var(--gray-light);
    background: var(--white);
    color: var(--dark);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.share-btn:hover {
    border-color: var(--primary);
    background: var(--primary);
    color: var(--white);
    transform: translateY(-3px);
}

.share-btn i {
    font-size: 1.5rem;
}

/* ===== TOAST NOTIFICATIONS ===== */
.toast-container {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    background: var(--white);
    color: var(--dark);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    border-left: 4px solid var(--primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    min-width: 300px;
    transform: translateX(400px);
    transition: var(--transition);
}

.toast.show {
    transform: translateX(0);
}

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

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

.toast.warning {
    border-left-color: var(--warning);
}

.toast i {
    font-size: 1.2rem;
}

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

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

.toast.warning i {
    color: var(--warning);
}

/* ===== ANIMATIONS ===== */
@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes bounce {
    0%, 20%, 53%, 80%, 100% {
        transform: translateY(0);
    }
    40%, 43% {
        transform: translateY(-15px);
    }
    70% {
        transform: translateY(-7px);
    }
    90% {
        transform: translateY(-3px);
    }
}

.fade-in {
    animation: fadeIn 0.5s ease forwards;
}

.slide-in-up {
    animation: slideInUp 0.6s ease forwards;
}

.slide-in-left {
    animation: slideInLeft 0.6s ease forwards;
}

.slide-in-right {
    animation: slideInRight 0.6s ease forwards;
}

.bounce {
    animation: bounce 1s ease forwards;
}

/* ===== UTILITY CLASSES ===== */
.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.hidden {
    display: none !important;
}

.visible {
    display: block !important;
}

.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.p-1 { padding: var(--spacing-xs); }
.p-2 { padding: var(--spacing-sm); }
.p-3 { padding: var(--spacing-md); }
.p-4 { padding: var(--spacing-lg); }
.p-5 { padding: var(--spacing-xl); }

/* ===== SCROLLBAR STYLING ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--light);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: var(--gray);
    border-radius: 10px;
}

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