/* === Modern To-Do App: Standalone Responsive CSS === */
/* Font & base reset are included — assumes Inter font & Font Awesome icons are loaded separately */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    background: linear-gradient(145deg, #f1f5f9 0%, #e4eaf1 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}

/* main card — fully responsive */
.todo-container {
    max-width: 700px;
    width: 100%;
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 2.5rem;
    box-shadow: 
        0 25px 50px -12px rgba(0, 0, 0, 0.15),
        inset 0 1px 2px rgba(255,255,255,0.8);
    padding: 2.5rem 2rem;
    border: 1px solid rgba(255,255,255,0.5);
}

/* typography */
h1 {
    font-size: 2.8rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #1e293b, #2d3b50);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.3rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

h1 i {
    background: linear-gradient(135deg, #2563eb, #1e40af);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-size: 2.5rem;
}

.sub-header {
    font-size: 0.95rem;
    color: #475569;
    margin-bottom: 2.2rem;
    padding-left: 0.5rem;
    border-left: 4px solid #2563eb;
    font-weight: 400;
}

/* ----- add task row (flex, responsive) ----- */
.add-task {
    display: flex;
    gap: 0.8rem;
    margin-bottom: 2.8rem;
    flex-wrap: wrap;
}

.add-task input {
    flex: 1 1 200px;
    padding: 1rem 1.5rem;
    border: 2px solid rgba(255,255,255,0.6);
    background: rgba(255,255,255,0.7);
    border-radius: 3rem;
    font-size: 1rem;
    font-weight: 500;
    outline: none;
    transition: all 0.2s ease;
    box-shadow: 0 4px 8px rgba(0,0,0,0.02);
    backdrop-filter: blur(4px);
    min-width: 0; /* prevents overflow */
}

.add-task input:focus {
    border-color: #2563eb;
    background: white;
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.15);
}

.add-task input::placeholder {
    color: #94a3b8;
    font-weight: 400;
}

.add-task button {
    background: #0f172a;
    border: none;
    color: white;
    width: 3.8rem;
    height: 3.8rem;
    border-radius: 3.8rem;
    font-size: 1.6rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: 0.2s;
    box-shadow: 0 12px 24px -8px rgba(15, 23, 42, 0.4);
    border: 1px solid rgba(255,255,255,0.2);
    flex-shrink: 0;
}

.add-task button:hover {
    background: #1e293b;
    transform: scale(1.02) rotate(90deg);
}

/* ----- filter tabs (responsive grid) ----- */
.filter-bar {
    display: flex;
    gap: 0.6rem;
    background: rgba(203, 213, 225, 0.3);
    padding: 0.4rem;
    border-radius: 3rem;
    margin-bottom: 2rem;
    backdrop-filter: blur(4px);
    flex-wrap: wrap;
    justify-content: center;
}

.filter-btn {
    flex: 1 1 auto;
    border: none;
    background: transparent;
    padding: 0.7rem 1.2rem;
    border-radius: 3rem;
    font-weight: 600;
    font-size: 0.95rem;
    color: #334155;
    cursor: pointer;
    transition: 0.15s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    white-space: nowrap;
}

.filter-btn i {
    font-size: 0.9rem;
    opacity: 0.8;
}

.filter-btn.active {
    background: white;
    color: #0f172a;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
    font-weight: 600;
}

/* ----- task list (scrollable + adaptive) ----- */
.task-list {
    list-style: none;
    margin-bottom: 2rem;
    max-height: 380px;
    overflow-y: auto;
    padding-right: 0.3rem;
    scroll-behavior: smooth;
}

.task-list li {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    background: rgba(255,255,255,0.6);
    backdrop-filter: blur(4px);
    margin-bottom: 0.7rem;
    padding: 0.9rem 1.2rem 0.9rem 1rem;
    border-radius: 2.5rem;
    border: 1px solid rgba(255,255,255,0.7);
    transition: all 0.15s;
    box-shadow: 0 2px 6px rgba(0,0,0,0.02);
    flex-wrap: wrap;
}

.task-list li:hover {
    background: rgba(255,255,255,0.9);
    border-color: #b1c5e0;
    box-shadow: 0 8px 18px -6px rgba(30, 64, 175, 0.2);
    transform: scale(1.01);
}

/* custom checkbox */
.task-check {
    appearance: none;
    -webkit-appearance: none;
    width: 1.8rem;
    height: 1.8rem;
    background: white;
    border-radius: 50%;
    border: 2px solid #cbd5e1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: 0.1s;
    flex-shrink: 0;
}

.task-check:checked {
    background: #2563eb;
    border-color: #2563eb;
    box-shadow: 0 6px 12px -4px #2563eb80;
}

.task-check:checked::after {
    content: "\f00c";
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    font-size: 1rem;
    color: white;
}

.task-text {
    flex: 1 1 180px;
    font-size: 1.1rem;
    font-weight: 500;
    color: #0b1e32;
    word-break: break-word;
    padding: 0.2rem 0;
    transition: 0.15s;
    min-width: 120px;
}

.completed-task .task-text {
    text-decoration: line-through;
    color: #94a3b8;
    font-weight: 400;
}

.task-actions {
    display: flex;
    gap: 0.5rem;
    flex-shrink: 0;
}

.edit-btn, .delete-btn {
    background: transparent;
    border: none;
    width: 2.4rem;
    height: 2.4rem;
    border-radius: 2rem;
    font-size: 1rem;
    color: #475569;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: 0.15s;
}

.edit-btn:hover {
    background: #dbeafe;
    color: #1e40af;
}

.delete-btn:hover {
    background: #fee2e2;
    color: #b91c1c;
}

/* ----- footer (responsive) ----- */
.footer-stats {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 0.8rem;
    border-top: 2px dashed #cbd5e1;
    flex-wrap: wrap;
    gap: 1rem;
}

.counter {
    background: #e9eef3;
    padding: 0.5rem 1.2rem;
    border-radius: 3rem;
    font-size: 0.9rem;
    font-weight: 600;
    color: #1e293b;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.maxoncodes a {
    background: transparent;
    border: 1px solid #cbd5e1;
    padding: 0.5rem 1.4rem;
    border-radius: 3rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: #475569;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    transition: 0.15s;
    text-decoration: none;
}

.clear-all {
    background: transparent;
    border: 1px solid #cbd5e1;
    padding: 0.5rem 1.4rem;
    border-radius: 3rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: #475569;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    transition: 0.15s;
}

.clear-all:hover {
    background: #fee2e2;
    border-color: #f87171;
    color: #b91c1c;
}

/* empty state */
.empty-state {
    text-align: center;
    padding: 2rem 0.5rem;
    color: #94a3b8;
    font-weight: 500;
    background: transparent !important;
    backdrop-filter: none !important;
    border: none !important;
    box-shadow: none !important;
    justify-content: center !important;
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 0.5rem;
    opacity: 0.5;
}

/* scrollbar nice */
.task-list::-webkit-scrollbar {
    width: 6px;
}
.task-list::-webkit-scrollbar-track {
    background: rgba(0,0,0,0.02);
    border-radius: 10px;
}
.task-list::-webkit-scrollbar-thumb {
    background: #b9c7da;
    border-radius: 10px;
}

/* ===== responsive fine-tuning ===== */
@media (max-width: 550px) {
    .todo-container {
        padding: 1.8rem 1.2rem;
        border-radius: 2rem;
    }

    h1 {
        font-size: 2.2rem;
    }
    h1 i {
        font-size: 2rem;
    }

    .add-task input {
        padding: 0.9rem 1.2rem;
        font-size: 0.95rem;
    }

    .add-task button {
        width: 3.2rem;
        height: 3.2rem;
        font-size: 1.4rem;
    }

    .filter-btn {
        padding: 0.6rem 0.8rem;
        font-size: 0.85rem;
    }

    .task-list li {
        padding: 0.8rem 1rem;
        gap: 0.5rem;
    }

    .task-text {
        font-size: 1rem;
        flex-basis: 140px;
    }

    .task-check {
        width: 1.6rem;
        height: 1.6rem;
    }

    .edit-btn, .delete-btn {
        width: 2.2rem;
        height: 2.2rem;
    }

    .footer-stats {
        flex-direction: column;
        align-items: stretch;
    }

    .counter, .clear-all {
        justify-content: center;
    }
}

@media (max-width: 380px) {
    .task-list li {
        flex-direction: column;
        align-items: flex-start;
    }

    .task-actions {
        align-self: flex-end;
        margin-top: 0.2rem;
    }

    .filter-bar {
        border-radius: 2rem;
    }

    .filter-btn {
        flex: 1 1 30%;
        white-space: normal;
        padding: 0.5rem 0.3rem;
    }
}