/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #0a0a0a;
    min-height: 100vh;
    color: #e0e0e0;
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 20% 30%, rgba(120, 119, 198, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(255, 119, 198, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 80%, rgba(120, 255, 198, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header Styles */
header {
    background: rgba(30, 30, 30, 0.8);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    text-align: center;
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    border-radius: 20px;
    z-index: -1;
}

h1 {
    color: #ffffff;
    margin-bottom: 25px;
    font-size: 2.8rem;
    font-weight: 700;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    position: relative;
}

.stats {
    display: flex;
    justify-content: center;
    gap: 25px;
    flex-wrap: wrap;
    position: relative;
}

.xp-display, .level-display, .xp-to-next {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #ffffff;
    padding: 15px 25px;
    border-radius: 15px;
    font-weight: 600;
    font-size: 1rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.xp-display::before, .level-display::before, .xp-to-next::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: left 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.xp-display:hover::before, .level-display:hover::before, .xp-to-next:hover::before {
    left: 100%;
}

.xp-display:hover, .level-display:hover, .xp-to-next:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

/* Navigation Tabs */
.nav-tabs {
    display: flex;
    background: rgba(30, 30, 30, 0.8);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    padding: 10px;
    margin-bottom: 30px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    position: relative;
    overflow: hidden;
}

.nav-tabs::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05), rgba(118, 75, 162, 0.05));
    border-radius: 15px;
    z-index: -1;
}

.tab-button {
    flex: 1;
    padding: 15px 20px;
    border: none;
    background: transparent;
    color: #888;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: 10px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.tab-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(102, 126, 234, 0.2), transparent);
    transition: left 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.tab-button:hover::before {
    left: 100%;
}

.tab-button:hover {
    background: rgba(102, 126, 234, 0.1);
    color: #ffffff;
    transform: translateY(-1px);
}

.tab-button.active {
    background: rgba(102, 126, 234, 0.3);
    color: #ffffff;
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.3);
    transform: translateY(-2px);
}

.tab-button.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    border-radius: 1px;
}

/* Main Content */
main {
    background: rgba(30, 30, 30, 0.8);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 35px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    position: relative;
    overflow: hidden;
}

main::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05), rgba(118, 75, 162, 0.05));
    border-radius: 20px;
    z-index: -1;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
}

h2 {
    color: #ffffff;
    font-size: 1.8rem;
    font-weight: 600;
    margin: 0;
}

.add-button, .clear-button {
    padding: 12px 20px;
    border: none;
    border-radius: 25px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.add-button {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.add-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.clear-button {
    background: linear-gradient(135deg, #ff6b6b, #ee5a24);
    color: white;
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.3);
}

.clear-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 107, 0.4);
}

/* Items List */
.items-list {
    display: grid;
    gap: 20px;
}

.item {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 15px;
    padding: 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    position: relative;
    overflow: hidden;
}

.item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    border-radius: 15px;
    z-index: -1;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.item:hover::before {
    opacity: 1;
}

.item:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
    border-color: rgba(102, 126, 234, 0.3);
}

.item.completed {
    background: rgba(76, 175, 80, 0.2);
    border-color: rgba(76, 175, 80, 0.4);
}

.item.completed::before {
    background: linear-gradient(135deg, rgba(76, 175, 80, 0.2), rgba(69, 160, 73, 0.2));
}

.item-content {
    flex: 1;
    position: relative;
    z-index: 1;
}

.item-title {
    font-size: 1.15rem;
    font-weight: 600;
    color: #ffffff;
    margin-bottom: 8px;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.item-details {
    color: #b0b0b0;
    font-size: 0.9rem;
    font-weight: 400;
}

.item-actions {
    display: flex;
    gap: 10px;
}

.complete-btn, .use-btn, .apply-btn, .delete-btn {
    padding: 8px 16px;
    border: none;
    border-radius: 20px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.85rem;
}

.complete-btn {
    background: linear-gradient(135deg, #4caf50, #45a049);
    color: white;
}

.complete-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 3px 10px rgba(76, 175, 80, 0.3);
}

.use-btn {
    background: linear-gradient(135deg, #ff9800, #f57c00);
    color: white;
}

.use-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 3px 10px rgba(255, 152, 0, 0.3);
}

.apply-btn {
    background: linear-gradient(135deg, #f44336, #d32f2f);
    color: white;
}

.apply-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 3px 10px rgba(244, 67, 54, 0.3);
}

.delete-btn {
    background: linear-gradient(135deg, #9e9e9e, #757575);
    color: white;
}

.delete-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 3px 10px rgba(158, 158, 158, 0.3);
}

/* Tab Content */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeInBounce 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@keyframes fadeInBounce {
    0% {
        opacity: 0;
        transform: translateY(20px) scale(0.95);
    }
    50% {
        opacity: 0.5;
        transform: translateY(-5px) scale(1.02);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Button Hover Effects */
.add-button:active, .clear-button:active,
.complete-btn:active, .use-btn:active, .apply-btn:active, .delete-btn:active,
.submit-button:active {
    transform: translateY(0) scale(0.98);
    transition: all 0.1s ease;
}

/* Loading Animation for Stats */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.8;
        transform: scale(1.05);
    }
}

.xp-display, .level-display, .xp-to-next {
    animation: pulse 2s ease-in-out infinite;
}

/* Floating Animation for Header */
@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-5px);
    }
}

header {
    animation: float 3s ease-in-out infinite;
}

/* Stagger Animation for Items */
.item:nth-child(1) { animation-delay: 0.1s; }
.item:nth-child(2) { animation-delay: 0.2s; }
.item:nth-child(3) { animation-delay: 0.3s; }
.item:nth-child(4) { animation-delay: 0.4s; }
.item:nth-child(5) { animation-delay: 0.5s; }
.item:nth-child(6) { animation-delay: 0.6s; }

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Focus States for Accessibility */
button:focus, input:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

/* Reduce Motion for Accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    animation: modalFadeIn 0.3s ease-out;
}

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

.modal-content {
    background: rgba(30, 30, 30, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    margin: 10% auto;
    padding: 35px;
    border-radius: 20px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    animation: modalSlideIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.modal-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    border-radius: 20px;
    z-index: -1;
}

@keyframes modalSlideIn {
    from {
        transform: translateY(-60px) scale(0.9);
        opacity: 0;
    }
    to {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}

.close {
    color: #888;
    float: right;
    font-size: 32px;
    font-weight: bold;
    cursor: pointer;
    margin-top: -5px;
    transition: all 0.3s ease;
    position: relative;
    z-index: 1;
}

.close:hover {
    color: #ffffff;
    transform: rotate(90deg);
}

.form-group {
    margin-bottom: 25px;
    position: relative;
    z-index: 1;
}

label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: #ffffff;
    font-size: 0.95rem;
}

input[type="text"], input[type="number"] {
    width: 100%;
    padding: 15px;
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    font-size: 1rem;
    color: #ffffff;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(10px);
}

input[type="text"]:focus, input[type="number"]:focus {
    outline: none;
    border-color: #667eea;
    background: rgba(102, 126, 234, 0.1);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
    transform: translateY(-1px);
}

input[type="text"]::placeholder, input[type="number"]::placeholder {
    color: #888;
}

.submit-button {
    width: 100%;
    padding: 18px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    z-index: 1;
    overflow: hidden;
}

.submit-button::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: left 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.submit-button:hover::before {
    left: 100%;
}

.submit-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

/* History Item */
.history-item {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-left: 4px solid #667eea;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 15px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.history-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05), rgba(118, 75, 162, 0.05));
    border-radius: 12px;
    z-index: -1;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.history-item:hover::before {
    opacity: 1;
}

.history-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.history-item.positive {
    border-left-color: #4caf50;
    background: rgba(76, 175, 80, 0.1);
}

.history-item.negative {
    border-left-color: #f44336;
    background: rgba(244, 67, 54, 0.1);
}

.history-item .item-title {
    color: #ffffff;
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 5px;
}

.history-item .timestamp {
    color: #888;
    font-size: 0.8rem;
    font-weight: 400;
}

/* Empty State */
.empty-state {
    text-align: center;
    color: #888;
    padding: 60px 20px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.empty-state p {
    font-size: 1.1rem;
    margin-bottom: 15px;
    color: #b0b0b0;
    font-weight: 500;
}

.empty-state .icon {
    font-size: 4rem;
    margin-bottom: 20px;
    opacity: 0.6;
    filter: drop-shadow(0 2px 10px rgba(0, 0, 0, 0.3));
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }

    .stats {
        flex-direction: column;
        gap: 15px;
    }

    .nav-tabs {
        flex-direction: column;
    }

    .section-header {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }

    .item {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }

    .item-actions {
        justify-content: center;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }
}