/* Modern Font and Base Styles */
body {
    font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 20px;
    transition: background-color 0.3s, color 0.3s;
    background: var(--bg-main);
    color: var(--text-main);
}

:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --accent: #06b6d4;
    --danger: #ef4444;
    --bg-main: #f7f8fa;
    --bg-card: #fff;
    --text-main: #23272f;
    --border: #e5e7eb;
    --shadow: 0 2px 8px rgba(0,0,0,0.06);
}
body.dark-mode {
    --primary: #818cf8;
    --primary-hover: #6366f1;
    --accent: #22d3ee;
    --danger: #f87171;
    --bg-main: #18181b;
    --bg-card: #23272f;
    --text-main: #f3f4f6;
    --border: #2a2a2a;
    --shadow: 0 2px 8px rgba(0,0,0,0.25);
}

.container {
    max-width: 900px;
    margin: 24px auto 0 auto;
    padding: 24px;
    background: var(--bg-card);
    border-radius: 18px;
    box-shadow: var(--shadow);
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    vertical-align: middle;
    padding-bottom: 18px;
}

h1 {
    font-size: 2.1em;
    font-weight: 700;
    letter-spacing: -1px;
    margin: 0 0 18px 0;
}
h2 {
    font-size: 1.2em;
    font-weight: 600;
    margin-top: 0;
    margin-bottom: 8px;
}

button {
    cursor: pointer;
    padding: 12px;
    border: none;
    border-radius: 8px;
    font-size: 1em;
    font-weight: 500;
    background: var(--primary);
    color: #fff;
    box-shadow: 0 1px 2px rgba(0,0,0,0.04);
    transition: background 0.2s, color 0.2s, box-shadow 0.2s;
    margin: 0;
    outline: none;
}
button:hover, button:focus {
    background: var(--primary-hover);
    box-shadow: 0 2px 8px rgba(99,102,241,0.08);
}
button:active {
    background: var(--accent);
}

a {
    text-decoration: none;
    color: #818cf8;
}

input, select {
    padding: 8px ;
    border: 1.5px solid var(--bg-card);
    border-radius: 8px;
    font-size: 1em;
    margin: 0;
    background: transparent;
    color: var(--text-main);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
    box-shadow: 0 1px 2px rgba(0,0,0,0.03);
}
input:focus, select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-hover)22;
}

.theme-switcher {
    display: flex;
    align-items: center;
    gap: 16px;
}

#currency-select {
    padding: 10px;
    border-radius: 7px;
    font-size: 1em;
    border: 1.5px solid var(--border);
    background: var(--bg-main);
    color: var(--text-main);
    outline: none;
    transition: border-color 0.2s;
    box-shadow: 0 1px 2px rgba(0,0,0,0.03);
}
#currency-select:focus {
    border-color: var(--primary);
}

#theme-toggle {
    background: #000;
    color: #fff;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    margin-left: 8px;
    width: 40px;
    height: 40px;
    position: relative;
    z-index: 999;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}

#theme-toggle:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

#theme-toggle:active {
    transform: scale(0.95);
}

#theme-toggle svg {
    width: 20px;
    height: 20px;
    display: block;
    pointer-events: none;
}

#theme-toggle .sun {
    display: none;
}

#theme-toggle .moon {
    display: none;
}

.content-wrapper {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 18px;
    margin-bottom: 18px;
}

section {
    padding: 18px 18px;
    border-radius: 14px;
    background: var(--bg-main);
    border: 1.5px solid var(--border);
    box-shadow: 0 1px 4px rgba(0,0,0,0.03);
    margin-bottom: 0;
}

#people-list, #items-list {
    margin-bottom: 22px;
}

.add-person-form, .add-item-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 14px;
}
.add-person-form {
    flex-direction: row;
    gap: 16px;
}
.add-person-form input {
    flex-grow: 1;
}
.add-item-form > * {
    margin-bottom: 0px;
}

.tax-section {
    display: flex;
    gap: 20px;
    align-items: flex-end;
    margin-bottom: 8px;
}

.tax-checkbox-container {
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 1;
    padding: 4px 0;
}

.tax-checkbox-container input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border: 2px solid var(--border);
    border-radius: 4px;
    background: var(--bg-main);
    position: relative;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
    outline: none;
    box-shadow: 0 1px 2px rgba(0,0,0,0.04);
    flex-shrink: 0;
}

.tax-checkbox-container input[type="checkbox"]:checked {
    background: var(--primary);
    border-color: var(--primary);
}

.tax-checkbox-container input[type="checkbox"]:checked::after {
    content: '';
    position: absolute;
    left: 6px;
    top: 3px;
    width: 4px;
    height: 8px;
    border: solid #fff;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
    pointer-events: none;
}

.tax-checkbox-container label {
    font-size: 1em;
    font-weight: 500;
    cursor: pointer;
    user-select: none;
    color: var(--text-main);
    line-height: 1.2;
}

.tax-input-container {
    flex: 1;
}

.tax-input-container label {
    display: block;
    margin-bottom: 6px;
    font-size: 0.9em;
    font-weight: 500;
    color: var(--text-main);
}

.tax-input-container input {
    width: 100%;
    padding: 8px;
    border: 1.5px solid var(--border);
    border-radius: 8px;
    font-size: 1em;
    background: var(--bg-main);
    color: var(--text-main);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.tax-input-container input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-hover)22;
}

.tax-input-container input:disabled {
    background: var(--bg-main);
    color: var(--text-main);
    opacity: 0.5;
    cursor: not-allowed;
    border-color: var(--border);
}

.tax-input-container input:disabled:focus {
    border-color: var(--border);
    box-shadow: none;
}

#shared-with-fieldset {
    border: 1.5px solid var(--border);
    border-radius: 7px;
    padding: 12px;
    margin-bottom: 12px;
    background: var(--bg-card);
}
#shared-with-fieldset legend {
    padding: 0 ;
    font-size: 0.98em;
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 8px;
}
#shared-with-fieldset div {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    margin-right: 12px;
}
#shared-with-fieldset input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 12px;
    height: 12px;
    border: 2px solid var(--border);
    border-radius: 6px;
    background: var(--bg-main);
    margin-right: 2px;
    position: relative;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
    vertical-align: middle;
    outline: none;
    box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}
#shared-with-fieldset input[type="checkbox"]:checked {
    background: var(--primary);
    border-color: var(--primary);
}
#shared-with-fieldset input[type="checkbox"]:checked::after {
    content: '';
    position: absolute;
    left: 4px;
    top: -2px;
    width: 7px;
    height: 13px;
    border: solid #fff;
    border-width: 0 3px 3px 0;
    border-radius: 1px;
    transform: rotate(45deg);
    pointer-events: none;
}
#shared-with-fieldset label {
    display: flex;
    align-items: center;
    font-size: 0.98em;
    cursor: pointer;
    user-select: none;
}

#summary-section {
    margin-top: 0px;
}
#summary-output {
    min-height: 100px;
    padding: 12px 12px;
    border-radius: 12px;
    margin-bottom: 24px;
    background: var(--bg-card);
    border: 1.5px solid var(--border);
    box-shadow: 0 1px 4px rgba(0,0,0,0.04);
    font-size: 1.08em;
}
.summary-actions {
    display: flex;
    gap: 18px;
    justify-content: flex-end;
    margin-top: 10px;
}

.summary-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 8px 8px;
    margin-top: 8px;
}
.summary-table th, .summary-table td {
    padding: 12px 16px;
    text-align: left;
    background: var(--bg-main);
    border-radius: 8px;
    font-size: 1em;
}
.summary-table th {
    font-weight: 700;
    color: var(--primary);
    background: var(--bg-card);
}
.summary-table td {
    font-weight: 500;
}

.person-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 10px;
    border-radius: 8px;
    margin-bottom: 8px;
    background: var(--bg-card);
    border: 1.5px solid var(--border);
    box-shadow: 0 1px 2px rgba(0,0,0,0.03);
    font-size: 1em;
}
.person-item .person-info {
    display: flex;
    align-items: center;
    gap: 4px;
}
.person-item .profile-pic {
    width: 24px;
    height: 24px;
    font-size: 0.95em;
    margin-right: 0;
}
.person-item input {
    margin-left: 0;
    padding: 4px 6px;
    height: 28px;
    font-size: 1em;
    width: 150px;
}
.person-item button {
    background: #ef4444;
    color: #fff;
    border: none;
    margin-left: 0;
    padding: 4px 8px;
    min-width: 32px;
    min-height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    transition: background 0.2s;
}
.person-item button:hover {
    background: #b91c1c;
}

.item-entry {
    display: flex;
    justify-content: space-between;
    /* align-items: center; */
    padding: 8px;
    border-radius: 9px;
    margin-bottom: 12px;
    background: var(--bg-card);
    border: 1.5px solid var(--border);
    box-shadow: 0 1px 2px rgba(0,0,0,0.03);
    font-size: 1em;
}
.item-entry button {
    background: #ef4444;
    color: #fff;
    border: none;
    margin-left: 0;
    padding: 4px 8px;
    min-width: 32px;
    min-height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    transition: background 0.2s;
}
.item-entry button:hover {
    background: #b91c1c;
}
.item-entry input {
    border: none;
    background: transparent;
    font-size: 1em;
    width: 60%;
    color: inherit;
}

/* Responsive Design */
@media (max-width: 800px) {
    .container {
        padding: 8px 4px;
    }
    header {
        padding: 10px 10px 10px 10px;
    }
    .content-wrapper {
        grid-template-columns: 1fr;
        gap: 12px;
        padding: 10px;
    }
    section {
        padding: 10px 10px;
    }
    #summary-section {
        margin: 0 10px 10px 10px;
    }
    .summary-actions {
        flex-direction: column;
        gap: 8px;
        align-items: stretch;
    }
    .item-entry, .person-item {
        flex-direction: row;
        /* align-items: center; */
        gap: 6px;
        padding: 8px 8px;
    }
    .item-entry button, .person-item button {
        width: 40px;
        min-width: 40px;
        min-height: 40px;
        font-size: 1em;
        padding: 6px;
    }
    .add-person-form {
        flex-direction: row;
        align-items: center;
        gap: 6px;
        padding: 0 2px;
    }
    .add-person-form input {
        flex: 1 1 auto;
        min-width: 0;
    }
    .add-person-form button {
        flex: 0 0 auto;
        width: auto;
        min-width: 40px;
        height: 38px;
        padding: 0 10px;
    }
    .add-item-form input, .add-item-form select {
        width: 100%;
        max-width: 100%;
        font-size: 1em;
        height: 38px;
        padding: 6px 8px;
    }
    .tax-section {
        flex-direction: column;
        gap: 16px;
        align-items: stretch;
        margin-bottom: 12px;
    }
    .tax-checkbox-container {
        justify-content: flex-start;
        padding: 6px 0;
    }
    .tax-input-container input {
        height: 38px;
        padding: 6px 8px;
    }
    .summary-table th, .summary-table td {
        padding: 8px 8px;
        font-size: 0.98em;
    }
    #summary-output {
        padding: 0px;
        font-size: 0.98em;
    }
    .item-shared-list span {
        margin-bottom: 2px;
    }
    .theme-switcher {
        gap: 6px;
    }
    #theme-toggle {
        width: 36px;
        height: 36px;
        padding: 0;
    }
    #currency-select {
        min-width: 80px;
        font-size: 0.98em;
        height: 36px;
        padding: 0 6px;
    }
    .logo {
        font-size: 1.3em;
    }
    #shared-with-fieldset input[type="checkbox"]:checked::after {
        width: 5px;
        height: 9px;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%) rotate(45deg);
        border-width: 0 2px 2px 0;
    }
}
@media (max-width: 500px) {
    h1 {
        font-size: 1em;
    }
    h2 {
        font-size: 0.95em;
    }
    .container {
        padding: 2px 0;
    }
    .item-entry, .person-item {
        padding: 4px 4px;
        font-size: 0.96em;
    }
    .summary-table th, .summary-table td {
        padding: 5px 10px;
        font-size: 0.96em;
    }
    #summary-output {
        padding: 5px 5px;
        font-size: 0.96em;
    }
    .add-person-form, .add-item-form {
        padding: 0 1px;
    }
}

input, select, button {
    min-width: 0;
    box-sizing: border-box;
}
.add-person-form input, .add-item-form input, .add-item-form select {
    width: 100%;
    max-width: 100%;
}

.profile-pic {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1em;
    color: #fff;
    margin-right: 14px;
    flex-shrink: 0;
    box-shadow: 0 1px 2px rgba(0,0,0,0.08);
    text-transform: uppercase;
}

.person-item .profile-pic {
    width: 28px;
    height: 28px;
    font-size: 0.98em;
    margin: 0;
}

#paid-by-select option .profile-pic {
    display: inline-block;
    margin-right: 6px;
}

#shared-with-fieldset .profile-pic {
    width: 22px;
    height: 22px;
    font-size: 0.92em;
    margin-right: 7px;
}

.danger {
    background: var(--danger) !important;
    color: #fff !important;
    padding: 12px 24px !important;
}
.danger:hover, .danger:focus {
    background: #b91c1c !important;
}

#share-image-btn {
    background: var(--accent) !important;
    color: #fff !important;
}
#share-image-btn:hover, #share-image-btn:focus {
    background: #0891b2 !important;
}

.item-shared-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 8px;
    font-size: 0.97em;
}
.item-shared-list .profile-pic {
    width: 20px;
    height: 20px;
    font-size: 0.85em;
    margin-right: 5px;
}

.logo {
    font-family: 'Inter', 'Segoe UI', system-ui, Arial, sans-serif;
    font-size: 2em;
    font-weight: 800;
    letter-spacing: -1px;
    color: var(--primary);
    display: flex;
    align-items: center;
    user-select: none;
}
.logo span {
    color: var(--accent);
    margin-left: 2px;
}