:root {
    /* Base Colors */
    --focus-bg: #fff2cc; /* Soft yellow */
    --focus-color: #d6b656;
    --focus-btn-bg: #ffe699;
    
    --short-break-bg: #d5e8d4; /* Soft green */
    --short-break-color: #82b366;
    --short-break-btn-bg: #b9e0a5;
    
    --long-break-bg: #dae8fc; /* Soft blue */
    --long-break-color: #6c8ebf;
    --long-break-btn-bg: #bac8d3;

    /* Current theme variables (default to focus) */
    --bg-color: var(--focus-bg);
    --primary-color: var(--focus-color);
    --btn-hover-bg: var(--focus-btn-bg);
    
    /* Typography */
    --text-main: #4a4a4a;
    --text-light: #7a7a7a;
    --white: #ffffff;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    transition: background-color 0.5s ease;
}

.app-container {
    width: 100%;
    max-width: 960px;
    padding: 20px;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

@media (min-width: 800px) {
    .app-container {
        flex-direction: row;
        align-items: stretch;
        justify-content: center;
        flex-wrap: wrap;
    }
    
    /* Ensure the app header stays full width at the top */
    .app-header {
        width: 100%;
        order: -1;
    }

    .timer-card, .notes-card {
        flex: 1;
        min-width: 360px;
        margin-top: 0 !important;
        display: flex;
        flex-direction: column;
    }
}

/* Header Area styling */
.app-header {
    width: 100%;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 20px;
}

/* Dark Mode Toggle */
#dark-mode-btn {
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: var(--text-main);
    cursor: pointer;
    opacity: 0.6;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

#dark-mode-btn:hover {
    opacity: 1;
    transform: translateY(-50%) scale(1.1);
}

.d-none {
    display: none !important;
}

/* Settings Button */
#settings-btn {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: var(--text-main);
    cursor: pointer;
    opacity: 0.6;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

#settings-btn:hover {
    opacity: 1;
    transform: translateY(-50%) rotate(45deg);
}

/* Stats Container */
.stats-container {
    background-color: rgba(255, 255, 255, 0.4);
    padding: 10px 20px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.stats-value {
    color: var(--primary-color);
    font-weight: 800;
    transition: color 0.5s ease;
}

/* Timer Card */
.timer-card {
    background-color: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    border-radius: 24px;
    padding: 30px;
    width: 100%;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.modes {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    background: rgba(255, 255, 255, 0.5);
    padding: 6px;
    border-radius: 12px;
}

.mode-btn {
    background: transparent;
    border: none;
    padding: 8px 16px;
    border-radius: 8px;
    font-weight: 700;
    color: var(--text-light);
    cursor: pointer;
    transition: all 0.3s ease;
}

.mode-btn:hover {
    color: var(--text-main);
}

.mode-btn.active {
    background-color: var(--white);
    color: var(--primary-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.timer-display {
    font-size: 6rem;
    font-weight: 800;
    color: var(--text-main);
    line-height: 1;
    margin-bottom: 40px;
    font-variant-numeric: tabular-nums;
    letter-spacing: -2px;
}

.controls {
    display: flex;
    gap: 15px;
    width: 100%;
}

button {
    font-family: inherit;
    font-size: 1rem;
}

.primary-btn {
    flex: 2;
    background-color: var(--white);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    border-radius: 12px;
    padding: 15px 0;
    font-weight: 800;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.primary-btn:hover {
    background-color: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

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

.secondary-btn {
    flex: 1;
    background-color: transparent;
    color: var(--text-main);
    border: 2px solid transparent;
    border-radius: 12px;
    padding: 15px 0;
    font-weight: 700;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.secondary-btn:hover {
    background-color: rgba(255, 255, 255, 0.5);
    border-color: rgba(0, 0, 0, 0.1);
}

.small-btn {
    padding: 8px 16px;
    font-size: 0.9rem;
    flex: none;
    background-color: var(--white);
    border: 1px solid #ddd;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.modal.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-content {
    background-color: var(--white);
    width: 90%;
    max-width: 400px;
    border-radius: 20px;
    padding: 25px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
    transform: translateY(0);
    transition: transform 0.3s ease;
}

.modal.hidden .modal-content {
    transform: translateY(20px);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.modal-header h2 {
    color: var(--text-main);
    font-size: 1.4rem;
}

.icon-btn {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    color: var(--text-light);
    cursor: pointer;
    line-height: 1;
}

.icon-btn:hover {
    color: var(--text-main);
}

.settings-section {
    margin-bottom: 25px;
}

.settings-section h3 {
    font-size: 1rem;
    color: var(--text-light);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.setting-group {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.setting-group label {
    font-weight: 600;
    color: var(--text-main);
}

.setting-group input, .setting-group select {
    width: 80px;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    text-align: right;
    outline: none;
    transition: border-color 0.3s ease;
}

.setting-group select {
    width: 140px;
    text-align: left;
}

.setting-group input:focus, .setting-group select:focus {
    border-color: var(--primary-color);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    margin-top: 10px;
}

.modal-footer .primary-btn {
    flex: none;
    padding: 10px 24px;
    font-size: 1rem;
}

/* Dark Mode Styles */
body.dark-mode {
    --text-main: #e0e0e0;
    --text-light: #a0a0a0;
    --white: #2a2a2a;
    
    --focus-bg: #2d2610; 
    --focus-color: #e6c86e;
    --focus-btn-bg: #b39b42;
    
    --short-break-bg: #1c2e1b;
    --short-break-color: #8cc474;
    --short-break-btn-bg: #618c4e;
    
    --long-break-bg: #172436;
    --long-break-color: #84a5d6;
    --long-break-btn-bg: #5a77a1;
}

body.dark-mode .timer-card {
    background-color: rgba(0, 0, 0, 0.4);
}

body.dark-mode .stats-container {
    background-color: rgba(0, 0, 0, 0.4);
}

body.dark-mode .modes {
    background-color: rgba(0, 0, 0, 0.3);
}

body.dark-mode .secondary-btn:hover {
    background-color: rgba(0, 0, 0, 0.3);
    border-color: rgba(255, 255, 255, 0.1);
}

body.dark-mode .modal-content {
    background-color: #1e1e1e;
    box-shadow: 0 10px 40px rgba(0,0,0,0.5);
}

body.dark-mode .setting-group input, 
body.dark-mode .setting-group select {
    background-color: #2a2a2a;
    color: #e0e0e0;
    border-color: #444;
}

body.dark-mode .small-btn {
    background-color: #2a2a2a;
    color: #e0e0e0;
    border-color: #444;
}

/* ---- Notes Section ---- */
.notes-card {
    background-color: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    border-radius: 24px;
    padding: 24px;
    width: 100%;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    margin-top: 20px;
}

.notes-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.notes-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--text-main);
}

.notes-title svg {
    color: var(--primary-color);
    transition: color 0.5s ease;
}

.notes-count {
    background-color: var(--primary-color);
    color: var(--white);
    font-size: 0.75rem;
    font-weight: 800;
    min-width: 24px;
    height: 24px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 8px;
    transition: background-color 0.5s ease, transform 0.2s ease;
}

.notes-count.bump {
    transform: scale(1.3);
}

.notes-input-row {
    display: flex;
    gap: 10px;
    margin-bottom: 16px;
}

.note-input {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid rgba(0, 0, 0, 0.08);
    border-radius: 12px;
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-main);
    background-color: rgba(255, 255, 255, 0.7);
    outline: none;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.note-input::placeholder {
    color: var(--text-light);
    font-weight: 500;
}

.note-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.04);
}

.add-note-btn {
    width: 46px;
    height: 46px;
    border-radius: 12px;
    border: 2px solid var(--primary-color);
    background-color: var(--white);
    color: var(--primary-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all 0.3s ease;
}

.add-note-btn:hover {
    background-color: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

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

.notes-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex: 1;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--primary-color) transparent;
}

.notes-list::-webkit-scrollbar {
    width: 4px;
}

.notes-list::-webkit-scrollbar-thumb {
    background-color: var(--primary-color);
    border-radius: 4px;
}

.note-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    background-color: rgba(255, 255, 255, 0.7);
    border-radius: 12px;
    transition: all 0.3s ease;
    animation: noteSlideIn 0.3s ease forwards;
}

@keyframes noteSlideIn {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.note-item.removing {
    animation: noteSlideOut 0.25s ease forwards;
}

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

.note-item:hover {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.note-checkbox {
    appearance: none;
    -webkit-appearance: none;
    width: 22px;
    height: 22px;
    border: 2px solid var(--primary-color);
    border-radius: 6px;
    cursor: pointer;
    flex-shrink: 0;
    position: relative;
    transition: all 0.25s ease;
    background-color: transparent;
}

.note-checkbox:checked {
    background-color: var(--primary-color);
}

.note-checkbox:checked::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 6px;
    width: 6px;
    height: 10px;
    border: solid var(--white);
    border-width: 0 2.5px 2.5px 0;
    transform: rotate(45deg);
}

.note-checkbox:hover {
    transform: scale(1.1);
}

.note-text {
    flex: 1;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-main);
    word-break: break-word;
    transition: all 0.3s ease;
}

.note-item.checked .note-text {
    text-decoration: line-through;
    opacity: 0.5;
}

.note-delete-btn {
    background: transparent;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    padding: 4px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.note-item:hover .note-delete-btn {
    opacity: 1;
}

.note-delete-btn:hover {
    color: #e74c3c;
    background-color: rgba(231, 76, 60, 0.1);
}

.notes-empty {
    text-align: center;
    color: var(--text-light);
    font-size: 0.9rem;
    font-weight: 600;
    padding: 20px 0 4px;
    opacity: 0.7;
}

.notes-empty.d-none {
    display: none !important;
}

/* Dark mode notes */
body.dark-mode .notes-card {
    background-color: rgba(0, 0, 0, 0.4);
}

body.dark-mode .note-input {
    background-color: rgba(0, 0, 0, 0.3);
    border-color: rgba(255, 255, 255, 0.1);
    color: #e0e0e0;
}

body.dark-mode .note-input::placeholder {
    color: #777;
}

body.dark-mode .note-item {
    background-color: rgba(255, 255, 255, 0.06);
}

body.dark-mode .note-delete-btn:hover {
    color: #ff6b6b;
    background-color: rgba(255, 107, 107, 0.15);
}

/* Responsiveness */
@media (max-width: 400px) {
    .timer-display {
        font-size: 5rem;
    }
    .modes {
        flex-direction: column;
        width: 100%;
        text-align: center;
    }
}