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

body {
    font-family: 'Arial', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    background-image: 
        radial-gradient(circle at 20% 50%, var(--gradient-bg-1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, var(--gradient-bg-2) 0%, transparent 50%);
    transition: background 0.5s ease, color 0.5s ease;
}

.container {
    max-width: 600px;
    width: 100%;
    position: relative;
    z-index: 10;
}

.title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 30px;
    text-shadow: 
        0 0 10px var(--color-primary),
        0 0 20px var(--color-primary),
        0 0 30px var(--color-primary);
    animation: flicker 3s infinite alternate;
    transition: text-shadow 0.5s ease;
}

@keyframes flicker {
    0%, 18%, 22%, 25%, 53%, 57%, 100% {
        text-shadow: 
            0 0 10px var(--color-primary),
            0 0 20px var(--color-primary),
            0 0 30px var(--color-primary);
    }
    20%, 24%, 55% {
        text-shadow: none;
    }
}

.habit-form {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
}

#habitInput {
    flex: 1;
    padding: 15px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-primary);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
    transition: all 0.3s ease;
}

#habitInput:focus {
    border-color: var(--border-secondary);
    box-shadow: 
        0 0 10px var(--color-secondary),
        0 0 20px var(--shadow-secondary);
}

#habitInput::placeholder {
    color: var(--text-secondary);
}

.add-btn {
    padding: 15px 30px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border: none;
    border-radius: 8px;
    color: #fff;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.add-btn:hover {
    transform: translateY(-2px);
    box-shadow: 
        0 0 20px var(--color-primary),
        0 0 30px var(--shadow-primary);
}

.add-btn:active {
    transform: translateY(0);
}

.habits-container {
    background: var(--bg-secondary);
    border: 2px solid var(--border-primary);
    border-radius: 12px;
    padding: 20px;
    min-height: 200px;
    box-shadow: 
        0 0 20px var(--shadow-primary),
        inset 0 0 20px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
}

.habit-list {
    list-style: none;
}

.habit-item {
    background: var(--bg-card);
    border: 2px solid var(--border-secondary);
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 15px;
    transition: all 0.3s ease;
    animation: slideIn 0.5s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.habit-item:hover {
    transform: translateX(5px);
    box-shadow: 
        0 0 15px var(--color-secondary),
        0 0 25px var(--shadow-secondary);
}

.habit-item.completed {
    opacity: 0.6;
    border-color: var(--border-completed);
}

.habit-item.completed .habit-text {
    text-decoration: line-through;
    color: var(--text-completed);
}

.habit-checkbox {
    width: 24px;
    height: 24px;
    cursor: pointer;
    accent-color: var(--color-primary);
}

.habit-text {
    flex: 1;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.delete-btn {
    padding: 8px 16px;
    background: #ff4444;
    border: none;
    border-radius: 6px;
    color: #fff;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
}

.delete-btn:hover {
    background: #ff0000;
    box-shadow: 
        0 0 10px #ff0000,
        0 0 20px rgba(255, 0, 0, 0.3);
    transform: scale(1.05);
}

.empty-state {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.2rem;
    padding: 40px 20px;
}

.empty-state::before {
    content: "👻";
    display: block;
    font-size: 4rem;
    margin-bottom: 10px;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

/* Streak Styles */
.streak {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    background: rgba(255, 140, 0, 0.2);
    border: 1px solid var(--color-secondary);
    border-radius: 12px;
    font-size: 0.9rem;
    font-weight: bold;
    color: var(--color-secondary);
    margin-left: auto;
    margin-right: 10px;
    transition: all 0.3s ease;
}

.streak-high {
    animation: fireGlow 1.5s ease-in-out infinite;
    background: rgba(255, 69, 0, 0.3);
    border-color: #ff4500;
    color: #ff4500;
    box-shadow: 0 0 10px rgba(255, 69, 0, 0.5);
}

@keyframes fireGlow {
    0%, 100% {
        box-shadow: 0 0 10px rgba(255, 69, 0, 0.5);
        transform: scale(1);
    }
    50% {
        box-shadow: 0 0 20px rgba(255, 69, 0, 0.8), 0 0 30px rgba(255, 140, 0, 0.6);
        transform: scale(1.05);
    }
}

.habit-item.completed .streak {
    opacity: 0.6;
}

/* Achievements Button */
.achievements-btn {
    position: fixed;
    top: 20px;
    left: 20px;
    background: transparent;
    border: none;
    font-size: 2.5rem;
    cursor: pointer;
    z-index: 100;
    transition: all 0.3s ease;
    filter: drop-shadow(0 0 10px var(--color-primary));
    animation: trophyBounce 2s ease-in-out infinite;
}

.achievements-btn:hover {
    transform: scale(1.2) rotate(10deg);
}

@keyframes trophyBounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

/* Achievement Popup */
.achievement-popup {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border: 3px solid #fff;
    border-radius: 16px;
    padding: 30px;
    z-index: 1000;
    opacity: 0;
    transition: all 0.5s ease;
    box-shadow: 0 0 40px var(--shadow-primary), 0 0 60px var(--shadow-secondary);
    max-width: 400px;
    text-align: center;
}

.achievement-popup.show {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
    animation: popupPulse 0.5s ease;
}

@keyframes popupPulse {
    0%, 100% {
        transform: translate(-50%, -50%) scale(1);
    }
    50% {
        transform: translate(-50%, -50%) scale(1.1);
    }
}

.achievement-popup-content {
    color: #fff;
}

.achievement-icon {
    font-size: 4rem;
    margin-bottom: 15px;
    animation: iconSpin 0.6s ease;
}

@keyframes iconSpin {
    from {
        transform: rotate(0deg) scale(0);
    }
    to {
        transform: rotate(360deg) scale(1);
    }
}

.achievement-title {
    font-size: 1.8rem;
    font-weight: bold;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.achievement-desc {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 999;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(5px);
}

.modal-content {
    background: var(--bg-secondary);
    border: 3px solid var(--border-primary);
    border-radius: 16px;
    padding: 30px;
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 0 40px var(--shadow-primary);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    border-bottom: 2px solid var(--border-primary);
    padding-bottom: 15px;
}

.modal-header h2 {
    color: var(--text-primary);
    font-size: 2rem;
    margin: 0;
    text-shadow: 0 0 10px var(--color-primary);
}

.modal-close {
    background: transparent;
    border: none;
    font-size: 2.5rem;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    line-height: 1;
}

.modal-close:hover {
    color: var(--color-secondary);
    transform: rotate(90deg);
}

.modal-body {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

/* Achievement Badge */
.achievement-badge {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 20px;
    background: var(--bg-card);
    border: 2px solid var(--border-secondary);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.achievement-badge.locked {
    opacity: 0.4;
    filter: grayscale(100%);
    border-color: var(--border-completed);
}

.achievement-badge.unlocked {
    animation: badgeGlow 2s ease-in-out infinite;
}

@keyframes badgeGlow {
    0%, 100% {
        box-shadow: 0 0 10px var(--shadow-secondary);
    }
    50% {
        box-shadow: 0 0 25px var(--shadow-primary), 0 0 35px var(--shadow-secondary);
    }
}

.achievement-badge-icon {
    font-size: 3rem;
    min-width: 60px;
    text-align: center;
}

.achievement-badge.unlocked .achievement-badge-icon {
    animation: badgeIconFloat 3s ease-in-out infinite;
}

@keyframes badgeIconFloat {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    50% {
        transform: translateY(-10px) rotate(5deg);
    }
}

.achievement-badge-info {
    flex: 1;
}

.achievement-badge-name {
    font-size: 1.3rem;
    font-weight: bold;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.achievement-badge-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* Sound Toggle Button */
.sound-toggle {
    position: fixed;
    top: 80px;
    left: 20px;
    background: transparent;
    border: none;
    font-size: 2.5rem;
    cursor: pointer;
    z-index: 100;
    transition: all 0.3s ease;
    filter: drop-shadow(0 0 10px var(--color-secondary));
}

.sound-toggle:hover {
    transform: scale(1.2);
    filter: drop-shadow(0 0 20px var(--color-secondary));
}

.sound-toggle:active {
    transform: scale(0.9);
}

/* Category Dropdown */
.habit-category {
    padding: 15px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-primary);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
    transition: all 0.3s ease;
    cursor: pointer;
    min-width: 180px;
}

.habit-category:focus {
    border-color: var(--border-secondary);
    box-shadow: 
        0 0 10px var(--color-secondary),
        0 0 20px var(--shadow-secondary);
}

.habit-category option {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

/* Filter Container */
.filter-container {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
    justify-content: center;
}

.filter-btn {
    padding: 10px 20px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-primary);
    border-radius: 20px;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
}

.filter-btn:hover {
    transform: translateY(-2px);
    border-color: var(--border-secondary);
    box-shadow: 0 0 15px var(--shadow-secondary);
}

.filter-btn.active {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border-color: var(--color-secondary);
    color: #fff;
    box-shadow: 
        0 0 20px var(--shadow-primary),
        0 0 30px var(--shadow-secondary);
    animation: filterGlow 2s ease-in-out infinite;
}

@keyframes filterGlow {
    0%, 100% {
        box-shadow: 
            0 0 20px var(--shadow-primary),
            0 0 30px var(--shadow-secondary);
    }
    50% {
        box-shadow: 
            0 0 30px var(--shadow-primary),
            0 0 40px var(--shadow-secondary),
            0 0 50px var(--shadow-secondary);
    }
}

/* Category Badge in Habit Item */
.habit-category-badge {
    font-size: 1.2rem;
    margin-right: 5px;
}

/* Update habit form to accommodate category dropdown */
.habit-form {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.habit-form input[type="text"] {
    flex: 1;
    min-width: 200px;
}