@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600&family=Quicksand:wght@400;500;600&display=swap');

:root {
    --primary-color: #0ef;
    --primary-gradient: linear-gradient(135deg, #0ef, #06c5f7);
    --secondary-color: #6c5ce7;
    --accent-color: #ff9ff3;
    --bg-color: #160f2b;
    --bg-gradient: linear-gradient(135deg, #160f2b, #2d1b5a);
    --card-bg: #201642;
    --card-gradient: linear-gradient(135deg, #201642, #2c1d54);
    --text-color: #fff;
    --completed-color: #777;
    --hover-color: #2b1d5a;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --task-shadow: 0 3px 8px rgba(0, 0, 0, 0.2);
    
    /* Adding responsive spacing variables */
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Adding responsive font size variables */
    --font-xs: 0.75rem;
    --font-sm: 0.875rem;
    --font-md: 1rem;
    --font-lg: 1.25rem;
    --font-xl: 1.5rem;
    --font-xxl: 2rem;
    --font-hero: 2.5rem;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

body {
    background: var(--bg-gradient);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    padding: var(--spacing-xl);
    position: relative;
    overflow-x: hidden;
    transition: padding 0.3s ease;
}

body::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -20%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(108, 92, 231, 0.1) 0%, rgba(0, 0, 0, 0) 70%);
    z-index: -1;
}

body::after {
    content: '';
    position: absolute;
    bottom: -30%;
    right: -20%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(0, 238, 255, 0.1) 0%, rgba(0, 0, 0, 0) 70%);
    z-index: -1;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: 1rem;
    position: relative;
}

header h1 {
    font-size: 2.5rem;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 2px 10px rgba(0, 238, 255, 0.2);
    font-weight: 600;
}

.back-to-portfolio {
    background: var(--primary-gradient);
    color: var(--bg-color);
    padding: 0.5rem 1.2rem;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 238, 255, 0.3);
    border: 2px solid transparent;
}

.back-to-portfolio:hover {
    background: transparent;
    color: var(--primary-color);
    box-shadow: 0 6px 20px rgba(0, 238, 255, 0.4);
    border: 2px solid var(--primary-color);
    transform: translateY(-2px);
}

.todo-container {
    background: var(--card-gradient);
    border-radius: 16px;
    box-shadow: 0 10px 30px var(--shadow-color), 0 0 0 1px rgba(255, 255, 255, 0.05) inset;
    overflow: hidden;
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
    transition: transform 0.3s ease, box-shadow 0.3s ease, width 0.3s ease;
    position: relative;
    --progress-percentage: 0%;
}

.todo-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color), var(--accent-color));
}

.todo-container:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(255, 255, 255, 0.07) inset;
}

.todo-container::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    height: 4px;
    width: var(--progress-percentage);
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    transition: width 0.5s ease;
    z-index: 1;
}

.input-section {
    display: flex;
    padding: 1.5rem;
    background-color: rgba(0, 0, 0, 0.2);
    position: relative;
}

#taskInput {
    flex: 1;
    padding: 1rem 1.2rem;
    border: none;
    border-radius: 12px 0 0 12px;
    background-color: rgba(255, 255, 255, 0.07);
    color: var(--text-color);
    font-size: 1rem;
    font-family: 'Quicksand', sans-serif;
    font-weight: 500;
    letter-spacing: 0.3px;
    transition: all 0.3s ease;
    box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.05) inset;
}

#taskInput:focus {
    outline: none;
    background-color: rgba(255, 255, 255, 0.1);
    box-shadow: 0 0 0 2px var(--primary-color);
}

#taskInput::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

#addButton {
    padding: 1rem 1.5rem;
    border: none;
    background: var(--primary-gradient);
    color: var(--bg-color);
    font-weight: 600;
    cursor: pointer;
    border-radius: 0 12px 12px 0;
    transition: all 0.3s ease;
    box-shadow: 0 4px 10px rgba(0, 238, 255, 0.2);
    position: relative;
    overflow: hidden;
}

#addButton::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: all 0.6s ease;
}

#addButton:hover {
    background: linear-gradient(135deg, #06c5f7, #0ef);
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(0, 238, 255, 0.3);
}

#addButton:hover::before {
    left: 100%;
}

.filters {
    display: flex;
    justify-content: space-between;
    padding: 1rem;
    background-color: rgba(0, 0, 0, 0.1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    margin: 0 auto;
    max-width: 100%;
    overflow-x: auto;
}

.filter-btn {
    background: none;
    border: none;
    color: var(--text-color);
    padding: 0.6rem 1rem;
    cursor: pointer;
    font-weight: 500;
    border-radius: 20px;
    transition: all 0.3s ease;
    position: relative;
    font-family: 'Quicksand', sans-serif;
    flex: 1;
    margin: 0 0.25rem;
    text-align: center;
    white-space: nowrap;
}

.filter-btn:hover {
    background-color: rgba(255, 255, 255, 0.07);
    transform: translateY(-2px);
}

.filter-btn.active {
    color: var(--primary-color);
}

.filter-btn.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 3px;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    border-radius: 3px;
}

.task-list {
    list-style: none;
    max-height: 350px;
    overflow-y: auto;
    padding: 0.5rem 0;
    background-color: rgba(0, 0, 0, 0.05);
}

.task-list::-webkit-scrollbar {
    width: 8px;
}

.task-list::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.1);
    border-radius: 4px;
}

.task-list::-webkit-scrollbar-thumb {
    background: linear-gradient(to bottom, var(--primary-color), var(--secondary-color));
    border-radius: 4px;
}

.task-item {
    display: flex;
    align-items: center;
    padding: 1.2rem 1.5rem;
    margin: 0.5rem 1rem;
    border-radius: 12px;
    background-color: rgba(255, 255, 255, 0.03);
    transition: all 0.3s ease;
    box-shadow: var(--task-shadow);
    border-left: 3px solid var(--primary-color);
    animation: slideInTask 0.3s ease forwards;
    opacity: 0;
    transform-origin: left center;
    will-change: transform, opacity, background-color;
}

.task-item:hover {
    background-color: rgba(255, 255, 255, 0.07);
    transform: translateX(5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.task-item.completed {
    border-left-color: var(--completed-color);
    background-color: rgba(0, 0, 0, 0.2);
}

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

.task-checkbox {
    margin-right: 1rem;
    appearance: none;
    width: 24px;
    height: 24px;
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    position: relative;
    transition: all 0.2s ease;
}

.task-checkbox:hover {
    transform: scale(1.1);
    box-shadow: 0 0 10px rgba(0, 238, 255, 0.5);
}

.task-checkbox:checked {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-color: transparent;
}

.task-checkbox:checked::after {
    content: '✓';
    color: var(--bg-color);
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    font-size: 14px;
    font-weight: bold;
}

.task-text {
    flex: 1;
    font-size: 1.05rem;
    font-family: 'Quicksand', sans-serif;
    font-weight: 500;
    letter-spacing: 0.3px;
    position: relative;
    transition: all 0.3s ease;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    padding-right: 5px;
}

.delete-btn {
    background: none;
    border: none;
    color: #ff5e5e;
    cursor: pointer;
    font-size: 1.3rem;
    opacity: 0.7;
    transition: all 0.3s ease;
    padding: 0.5rem;
    border-radius: 50%;
}

.delete-btn:hover {
    opacity: 1;
    background-color: rgba(255, 94, 94, 0.1);
    transform: scale(1.1) rotate(5deg);
}

.task-stats {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 1.5rem;
    font-size: 0.95rem;
    background-color: rgba(0, 0, 0, 0.2);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    font-family: 'Quicksand', sans-serif;
}

#taskCount {
    color: var(--text-color);
    font-weight: 500;
}

#clearCompleted {
    background: none;
    border: none;
    color: var(--primary-color);
    cursor: pointer;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
}

#clearCompleted:hover {
    background-color: rgba(0, 238, 255, 0.1);
    transform: translateX(2px);
}

footer {
    margin-top: 1.5rem;
    text-align: center;
    padding: 1rem 0 0.5rem;
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.7);
    font-family: 'Quicksand', sans-serif;
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s ease;
}

footer a:hover {
    color: var(--accent-color);
    text-decoration: underline;
}

/* Animations for tasks */
.shake {
    animation: shake 0.5s cubic-bezier(.36,.07,.19,.97) both;
}

@keyframes shake {
    10%, 90% {
        transform: translate3d(-1px, 0, 0);
    }
    20%, 80% {
        transform: translate3d(2px, 0, 0);
    }
    30%, 50%, 70% {
        transform: translate3d(-4px, 0, 0);
    }
    40%, 60% {
        transform: translate3d(4px, 0, 0);
    }
}

.fade-out {
    animation: fadeOut 0.3s forwards;
}

@keyframes fadeOut {
    to {
        opacity: 0;
        transform: translateY(-10px);
    }
}

.empty-message {
    text-align: center;
    padding: 1.5rem;
    color: rgba(255, 255, 255, 0.5);
    font-style: italic;
    font-family: 'Quicksand', sans-serif;
    animation: fadeIn 0.5s ease forwards;
}

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

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

/* Responsive styles */
@media screen and (max-width: 600px) {
    body {
        padding: 1rem;
    }
    
    header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .back-to-portfolio {
        align-self: flex-end;
    }
    
    .input-section {
        flex-direction: column;
        gap: 0.8rem;
    }
    
    #taskInput, #addButton {
        width: 100%;
        border-radius: 12px;
    }
    
    .filter-btn {
        padding: 0.5rem;
        margin: 0 0.2rem;
        font-size: 0.9rem;
    }
}

/* Particles animation */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.particle {
    position: absolute;
    border-radius: 50%;
    background: var(--primary-color);
    opacity: 0.3;
    animation: float-particle 15s infinite linear;
}

.particle:nth-child(1) {
    width: 60px;
    height: 60px;
    top: 20%;
    left: 10%;
    animation-duration: 25s;
    background: var(--accent-color);
    filter: blur(20px);
}

.particle:nth-child(2) {
    width: 80px;
    height: 80px;
    top: 60%;
    left: 80%;
    animation-duration: 30s;
    animation-delay: 2s;
    background: var(--secondary-color);
    filter: blur(30px);
}

.particle:nth-child(3) {
    width: 40px;
    height: 40px;
    top: 80%;
    left: 30%;
    animation-duration: 20s;
    animation-delay: 5s;
    background: var(--primary-color);
    filter: blur(15px);
}

.particle:nth-child(4) {
    width: 50px;
    height: 50px;
    top: 10%;
    left: 60%;
    animation-duration: 22s;
    animation-delay: 1s;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    filter: blur(20px);
}

.particle:nth-child(5) {
    width: 70px;
    height: 70px;
    top: 50%;
    left: 5%;
    animation-duration: 28s;
    animation-delay: 3s;
    background: var(--secondary-color);
    filter: blur(25px);
}

.particle:nth-child(6) {
    width: 45px;
    height: 45px;
    top: 30%;
    left: 90%;
    animation-duration: 24s;
    animation-delay: 7s;
    background: var(--accent-color);
    filter: blur(18px);
}

.particle:nth-child(7) {
    width: 55px;
    height: 55px;
    top: 85%;
    left: 70%;
    animation-duration: 26s;
    animation-delay: 4s;
    background: var(--primary-color);
    filter: blur(22px);
}

.particle:nth-child(8) {
    width: 65px;
    height: 65px;
    top: 40%;
    left: 40%;
    animation-duration: 32s;
    animation-delay: 8s;
    background: linear-gradient(45deg, var(--accent-color), var(--primary-color));
    filter: blur(24px);
}

@keyframes float-particle {
    0% {
        transform: translateY(0) translateX(0) rotate(0deg);
    }
    50% {
        transform: translateY(-100px) translateX(100px) rotate(180deg);
    }
    100% {
        transform: translateY(0) translateX(0) rotate(360deg);
    }
}

/* Header updates */
.header-content {
    display: flex;
    flex-direction: column;
}

.tagline {
    margin-top: 0.5rem;
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.7);
    font-family: 'Quicksand', sans-serif;
    font-weight: 400;
}

header h1 i {
    margin-right: 0.5rem;
    color: var(--primary-color);
}

/* Button icon styles */
#addButton i, #clearCompleted i {
    margin-right: 0.5rem;
    font-size: 1.1rem;
}

/* App info section */
.app-info {
    margin: 2rem auto;
    max-width: 600px;
    text-align: center;
}

.app-features {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 1rem;
    padding: 0 0.5rem;
}

.feature {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: rgba(255, 255, 255, 0.05);
    padding: 0.8rem;
    border-radius: 12px;
    width: 32%;
    transition: all 0.3s ease;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    border-top: 3px solid var(--primary-color);
}

.feature:nth-child(2) {
    border-top-color: var(--secondary-color);
}

.feature:nth-child(3) {
    border-top-color: var(--accent-color);
}

.feature:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.1);
}

.feature i {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.feature:nth-child(2) i {
    color: var(--secondary-color);
}

.feature:nth-child(3) i {
    color: var(--accent-color);
}

.feature span {
    font-family: 'Quicksand', sans-serif;
    font-size: 0.9rem;
    font-weight: 500;
    text-align: center;
}

/* Footer social links */
.social-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1rem;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--bg-color);
    font-size: 1.2rem;
    transition: all 0.3s ease;
}

.social-links a:hover {
    transform: translateY(-3px) rotate(5deg);
    box-shadow: 0 5px 15px rgba(0, 238, 255, 0.3);
}

/* Responsive adjustments */
@media screen and (max-width: 600px) {
    .app-features {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }
    
    .feature {
        width: 100%;
        max-width: 280px;
    }

    .header-content {
        align-items: flex-start;
    }
    
    .tagline {
        font-size: 0.95rem;
    }

    header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .back-to-portfolio {
        align-self: flex-end;
    }
    
    .input-section {
        flex-direction: column;
        gap: 0.8rem;
    }
    
    #taskInput, #addButton {
        width: 100%;
        border-radius: 12px;
    }
    
    .filter-btn {
        padding: 0.5rem;
        margin: 0 0.2rem;
        font-size: 0.9rem;
    }
}

/* UPDATED COMPREHENSIVE RESPONSIVE DESIGN */

/* Large Desktops (1440px and up) */
@media screen and (min-width: 1440px) {
    :root {
        --font-hero: 3rem;
        --font-xxl: 2.2rem;
        --font-xl: 1.8rem;
        --font-lg: 1.4rem;
    }
    
    .todo-container {
        max-width: 700px;
    }
    
    .task-list {
        max-height: 450px;
    }
    
    .app-features {
        max-width: 800px;
    }
}

/* Desktops (1200px - 1439px) */
@media screen and (min-width: 1200px) and (max-width: 1439px) {
    .todo-container {
        max-width: 650px;
    }
    
    .task-list {
        max-height: 400px;
    }
}

/* Small Desktops and Laptops (992px - 1199px) */
@media screen and (min-width: 992px) and (max-width: 1199px) {
    body {
        padding: var(--spacing-lg);
    }
    
    header h1 {
        font-size: 2.2rem;
    }
}

/* Tablets (768px - 991px) */
@media screen and (min-width: 768px) and (max-width: 991px) {
    body {
        padding: var(--spacing-lg);
    }
    
    .header-content {
        flex-direction: column;
        align-items: flex-start;
    }
    
    header h1 {
        font-size: 2rem;
        margin-bottom: 0.5rem;
    }
    
    .tagline {
        font-size: 0.9rem;
    }
    
    .todo-container {
        max-width: 90%;
    }
    
    .input-section {
        flex-wrap: nowrap;
    }
    
    .app-features {
        gap: 1rem;
    }
}

/* Large Mobile to Small Tablets (576px - 767px) */
@media screen and (min-width: 576px) and (max-width: 767px) {
    :root {
        --spacing-xl: 1.5rem;
        --font-hero: 2rem;
    }
    
    body {
        padding: var(--spacing-md) var(--spacing-lg);
    }
    
    header {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 1rem;
        margin-bottom: 1.5rem;
    }
    
    .header-content {
        flex-direction: column;
        align-items: center;
    }
    
    header h1 {
        font-size: var(--font-hero);
        margin-bottom: 0.3rem;
    }
    
    .tagline {
        font-size: 0.9rem;
    }
    
    .todo-container {
        max-width: 95%;
    }
    
    .input-section {
        padding: var(--spacing-md);
    }
    
    #taskInput, #addButton {
        padding: 0.8rem;
        font-size: 0.9rem;
    }
    
    .filter-btn {
        padding: 0.5rem 0.8rem;
        font-size: 0.8rem;
        margin: 0 0.2rem;
    }
    
    .task-stats {
        padding: var(--spacing-md);
        flex-direction: column;
        gap: 0.8rem;
        align-items: center;
    }
    
    #clearCompleted {
        width: 100%;
    }
    
    .app-features {
        flex-direction: column;
        padding: var(--spacing-md);
    }
    
    .feature {
        width: 100%;
        padding: var(--spacing-md);
    }
    
    footer {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
        padding: var(--spacing-md);
    }
}

/* Mobile Phones (320px - 575px) */
@media screen and (max-width: 575px) {
    :root {
        --spacing-xl: 1rem;
        --font-hero: 1.8rem;
        --font-xxl: 1.6rem;
        --font-xl: 1.3rem;
        --font-lg: 1.1rem;
    }
    
    body {
        padding: var(--spacing-md);
    }
    
    header {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 1rem;
        margin-bottom: 1.2rem;
    }
    
    .header-content {
        flex-direction: column;
        align-items: center;
    }
    
    header h1 {
        font-size: var(--font-hero);
        margin-bottom: 0.3rem;
    }
    
    header h1 i {
        font-size: 1.5rem;
    }
    
    .tagline {
        font-size: 0.8rem;
    }
    
    .back-to-portfolio {
        font-size: 0.8rem;
        padding: 0.4rem 0.8rem;
    }
    
    .todo-container {
        border-radius: 12px;
    }
    
    .input-section {
        padding: var(--spacing-sm);
        flex-direction: column;
        gap: 0.8rem;
    }
    
    #taskInput {
        width: 100%;
        border-radius: 8px;
        padding: 0.8rem;
        font-size: 0.9rem;
    }
    
    #addButton {
        width: 100%;
        border-radius: 8px;
        padding: 0.8rem;
        font-size: 0.9rem;
    }
    
    #addButton i {
        font-size: 0.9rem;
    }
    
    .filters {
        padding: 0.8rem 0.5rem;
        justify-content: space-around;
    }
    
    .filter-btn {
        padding: 0.4rem 0.5rem;
        font-size: 0.75rem;
        margin: 0 0.1rem;
        min-width: 60px;
    }
    
    .task-item {
        padding: 0.8rem;
    }
    
    .task-text {
        font-size: 0.9rem;
        max-width: 170px;
    }
    
    .task-stats {
        padding: 0.8rem 1rem;
        flex-direction: row;
    }
    
    #taskCount {
        font-size: 0.75rem;
    }
    
    #clearCompleted {
        width: auto;
        font-size: 0.75rem;
        padding: 0.5rem 0.7rem;
    }
    
    .app-features {
        flex-direction: row;
        gap: 0.5rem;
    }
    
    .feature {
        width: 100%;
        padding: 0.7rem;
        margin-bottom: 0.5rem;
        flex-direction: row;
        justify-content: flex-start;
        text-align: left;
        align-items: center;
    }
    
    .feature i {
        font-size: 1.3rem;
        margin-right: 0.5rem;
        margin-bottom: 0;
    }
    
    .feature span {
        font-size: 0.85rem;
    }
    
    footer {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
        padding: var(--spacing-md) var(--spacing-sm);
        font-size: 0.8rem;
    }
    
    .social-links {
        justify-content: center;
        margin-top: 0.5rem;
    }
    
    .social-links a {
        width: 35px;
        height: 35px;
        font-size: 1.1rem;
    }
}

/* Small Mobile Phones (320px - 374px) */
@media screen and (max-width: 374px) {
    :root {
        --spacing-xl: 0.8rem;
        --font-hero: 1.6rem;
    }
    
    body {
        padding: 0.8rem;
    }
    
    header h1 {
        font-size: 1.5rem;
    }
    
    header h1 i {
        font-size: 1.3rem;
    }
    
    .tagline {
        font-size: 0.7rem;
    }
    
    .back-to-portfolio {
        font-size: 0.7rem;
        padding: 0.3rem 0.6rem;
    }
    
    .task-text {
        max-width: 140px;
        font-size: 0.8rem;
    }
    
    .task-checkbox {
        width: 18px;
        height: 18px;
    }
    
    .delete-btn {
        width: 28px;
        height: 28px;
        font-size: 0.9rem;
    }
}

/* For larger phone screens with higher pixel density */
@media screen and (max-width: 400px) and (min-resolution: 2dppx) {
    .task-text {
        max-width: 150px;
    }
    
    .filter-btn {
        margin: 0 0.05rem;
        padding: 0.4rem 0.5rem;
    }
}

/* Landscape mode for mobile */
@media screen and (max-height: 500px) and (orientation: landscape) {
    body {
        padding: 0.5rem 1rem;
    }
    
    header {
        margin-bottom: 0.8rem;
    }
    
    .header-content {
        flex-direction: row;
        align-items: center;
        gap: 1rem;
    }
    
    header h1 {
        margin-bottom: 0;
        font-size: 1.5rem;
    }
    
    .todo-container {
        max-width: 90%;
    }
    
    .task-list {
        max-height: 200px;
    }
    
    .app-features {
        display: flex;
        flex-direction: row;
        flex-wrap: wrap;
        gap: 0.5rem;
        padding: 0 0.5rem;
    }
    
    .feature {
        flex-direction: row;
        justify-content: flex-start;
        align-items: center;
        width: 48%;
        padding: 0.5rem 0.8rem;
        margin-bottom: 0;
    }
    
    .feature i {
        font-size: 1.1rem;
        margin-right: 0.5rem;
        margin-bottom: 0;
    }
    
    .app-info {
        margin: 1rem auto;
    }
    
    footer {
        padding: 0.5rem;
    }
}

/* Animation and transition enhancements for responsive elements */
.todo-container, 
.input-section, 
#taskInput, 
#addButton, 
.filter-btn, 
.task-item, 
.task-stats,
.feature,
.back-to-portfolio,
.social-links a {
    transition: all 0.3s ease;
}

/* Add a responsive animation for content loading */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.todo-container {
    animation: fadeInUp 0.5s ease-out forwards;
}

header, .app-info, footer {
    opacity: 0;
    animation: fadeInUp 0.5s ease-out forwards;
}

header {
    animation-delay: 0.1s;
}

.app-info {
    animation-delay: 0.3s;
}

footer {
    animation-delay: 0.4s;
}

/* Hover/focus state improvements for touch devices */
@media (hover: hover) {
    /* Only apply hover effects on devices that support hover */
    .task-item:hover {
        transform: translateX(5px);
        background-color: var(--hover-color);
    }
    
    .filter-btn:hover {
        background-color: rgba(255, 255, 255, 0.07);
        transform: translateY(-2px);
    }
    
    .feature:hover {
        transform: translateY(-5px);
    }
}

/* Active state for touch devices */
@media (hover: none) {
    .filter-btn:active,
    .task-item:active,
    #addButton:active,
    #clearCompleted:active,
    .back-to-portfolio:active,
    .feature:active,
    .social-links a:active {
        transform: scale(0.95);
        opacity: 0.8;
    }
}

/* Add styles for notification system */
.notification {
    position: fixed;
    bottom: -100px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--card-gradient);
    color: var(--text-color);
    padding: 0.8rem 1.5rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    z-index: 100;
    transition: bottom 0.3s ease;
    font-size: 0.9rem;
    max-width: 90%;
    text-align: center;
}

.notification.show {
    bottom: 20px;
}

.notification.success {
    border-left: 4px solid #4caf50;
}

.notification.info {
    border-left: 4px solid var(--primary-color);
}

.notification.error {
    border-left: 4px solid #f44336;
}

/* Add highlight animation for new tasks */
@keyframes highlight {
    0% {
        background-color: rgba(0, 238, 255, 0.2);
    }
    100% {
        background-color: transparent;
    }
}

.task-item.highlight {
    animation: highlight 1s ease;
}

/* Better touch feedback for mobile */
@media (hover: none) {
    .task-item.active {
        background-color: var(--hover-color);
        transform: translateX(5px);
    }
}

/* Loading animation for tasks */
@keyframes slideInTask {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.task-item {
    animation: slideInTask 0.3s ease forwards;
    opacity: 0;
}

/* Responsive notification adjustments */
@media screen and (max-width: 576px) {
    .notification {
        padding: 0.6rem 1rem;
        font-size: 0.8rem;
        max-width: 85%;
    }
    
    .notification.show {
        bottom: 10px;
    }
}

/* Add swipe animations and states */
.task-item.swiping {
    transition: transform 0.05s linear, background-color 0.2s ease;
    z-index: 2;
}

/* Progress indicator feedback */
.todo-container.progress-updated::after {
    animation: pulse 1s ease;
}

@keyframes pulse {
    0% {
        opacity: 0.5;
    }
    50% {
        opacity: 1;
    }
    100% {
        opacity: 0.5;
    }
}

/* Enhance task item animations */
.task-item {
    animation: slideInTask 0.3s ease forwards;
    opacity: 0;
    transform-origin: left center;
    will-change: transform, opacity, background-color;
}

/* Add empty state styling improvements */
.empty-message {
    text-align: center;
    padding: 1.5rem;
    color: rgba(255, 255, 255, 0.5);
    font-style: italic;
    font-family: 'Quicksand', sans-serif;
    animation: fadeIn 0.5s ease forwards;
}

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

/* Make task text properly truncate on overflow */
.task-text {
    flex: 1;
    font-size: 1.05rem;
    font-family: 'Quicksand', sans-serif;
    font-weight: 500;
    letter-spacing: 0.3px;
    transition: all 0.3s ease;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    padding-right: 5px;
}

/* Fix mobile filter button appearance */
@media screen and (max-width: 575px) {
    .filters {
        border-radius: 8px;
        margin: 0 0.5rem;
        width: calc(100% - 1rem);
        background-color: rgba(0, 0, 0, 0.15);
    }
    
    /* Make task text wrap when needed on small screens */
    .task-text {
        white-space: normal;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        line-height: 1.3;
    }
}