/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --clr-primary: #1e3a5f;
    --clr-primary-light: #2a5a8f;
    --clr-accent: #3b82f6;
    --clr-bg: #f0f4f8;
    --clr-surface: #ffffff;
    --clr-text: #1e293b;
    --clr-text-muted: #64748b;
    --clr-border: #e2e8f0;
    --clr-office: #dbeafe;
    --clr-office-text: #1e40af;
    --clr-wfh: #dcfce7;
    --clr-wfh-text: #166534;
    --clr-holiday: #fef3c7;
    --clr-holiday-text: #b45309;
    --clr-weekend: #f1f5f9;
    --clr-weekend-text: #94a3b8;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
    --transition: 0.2s ease;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--clr-bg);
    color: var(--clr-text);
    line-height: 1.5;
    -webkit-tap-highlight-color: transparent;
    min-height: 100vh;
}

/* ===== Container ===== */
.container {
    max-width: 480px;
    margin: 0 auto;
    padding: 16px;
    min-height: 100vh;
}

@media (min-width: 540px) {
    .container {
        max-width: 520px;
        padding: 24px;
        margin: 20px auto;
        min-height: auto;
        background: var(--clr-surface);
        border-radius: 20px;
        box-shadow: var(--shadow-lg);
    }
}

/* ===== Header ===== */
.app-header {
    text-align: center;
    padding: 8px 0 16px;
}

.app-header h1 {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--clr-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 2px;
}

.calendar-icon {
    font-size: 1.3rem;
}

.app-subtitle {
    font-size: 0.85rem;
    color: var(--clr-text-muted);
    font-weight: 400;
}

/* ===== Target Row ===== */
.target-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--clr-surface);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius);
    padding: 12px 16px;
    margin-bottom: 12px;
    box-shadow: var(--shadow-sm);
}

@media (min-width: 540px) {
    .target-row {
        background: var(--clr-bg);
        border: none;
    }
}

.target-row label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--clr-text);
    margin: 0;
    display: block;
}

.target-input-wrap {
    display: flex;
    align-items: center;
    gap: 0;
    background: var(--clr-bg);
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--clr-border);
}

@media (min-width: 540px) {
    .target-input-wrap {
        background: var(--clr-surface);
    }
}

.target-step {
    width: 36px;
    height: 36px;
    border: none;
    background: transparent;
    color: var(--clr-primary);
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition);
    padding: 0;
    border-radius: 0;
}

.target-step:hover {
    background: var(--clr-border);
}

.target-step:active {
    background: #cbd5e1;
}

#target-days {
    width: 44px;
    text-align: center;
    font-weight: 700;
    font-size: 1.05rem;
    border: none;
    background: transparent;
    color: var(--clr-text);
    padding: 6px 0;
    -moz-appearance: textfield;
    appearance: textfield;
}

#target-days::-webkit-outer-spin-button,
#target-days::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

/* ===== Month Navigation ===== */
.month-nav-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 14px;
}

.month-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex: 1;
    padding: 0 4px;
}

#current-month-display {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--clr-primary);
    flex-grow: 1;
    text-align: center;
    user-select: none;
}

.nav-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--clr-surface);
    border: 1px solid var(--clr-border);
    color: var(--clr-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition);
    padding: 0;
    box-shadow: var(--shadow-sm);
    font-size: 0;
}

.nav-btn:hover {
    background: var(--clr-primary);
    color: white;
    border-color: var(--clr-primary);
    box-shadow: var(--shadow-md);
}

.nav-btn:active {
    transform: scale(0.93);
}

.nav-btn svg {
    width: 18px;
    height: 18px;
}

/* ===== Stats Bar ===== */
.stats-bar {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    margin-bottom: 14px;
}

.stat-card {
    text-align: center;
    padding: 12px 6px 10px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--clr-border);
    background: var(--clr-surface);
}

@media (min-width: 540px) {
    .stat-card {
        background: var(--clr-bg);
        border: none;
    }
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1.2;
}

.stat-label {
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--clr-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    margin-top: 2px;
}

.stat-remaining .stat-value { color: var(--clr-primary); }
.stat-office .stat-value { color: var(--clr-office-text); }
.stat-holidays .stat-value { color: var(--clr-holiday-text); }

/* ===== Mode Selector ===== */
.mode-selector {
    margin-bottom: 14px;
    padding: 14px;
    background: var(--clr-surface);
    border-radius: var(--radius);
    border: 1px solid var(--clr-border);
    box-shadow: var(--shadow-sm);
}

@media (min-width: 540px) {
    .mode-selector {
        background: var(--clr-bg);
        border: none;
    }
}

.mode-title {
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--clr-text-muted);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.mode-buttons {
    display: flex;
    gap: 6px;
}

.mode-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    padding: 10px 4px 8px;
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    opacity: 0.55;
    min-width: 0;
}

.mode-btn:hover {
    opacity: 0.85;
    transform: translateY(-1px);
}

.mode-btn.active {
    opacity: 1;
    border-color: var(--clr-primary);
    box-shadow: 0 2px 8px rgba(30,58,95,0.18);
    transform: translateY(-2px);
}

.mode-icon {
    font-size: 1.2rem;
    line-height: 1;
}

.mode-label {
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.mode-holiday { background: var(--clr-holiday); color: var(--clr-holiday-text); }
.mode-office { background: var(--clr-office); color: var(--clr-office-text); }
.mode-wfh { background: var(--clr-wfh); color: var(--clr-wfh-text); }
.mode-clear { background: var(--clr-weekend); color: var(--clr-weekend-text); }
.mode-reset { background: #fee2e2; color: #dc2626; }

/* ===== Calendar ===== */
.calendar-container {
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--clr-border);
    margin-bottom: 10px;
}

.calendar {
    width: 100%;
    border-collapse: collapse;
    table-layout: fixed;
}

.calendar-header th {
    background: var(--clr-primary);
    color: rgba(255,255,255,0.9);
    padding: 10px 0;
    text-align: center;
    font-weight: 500;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.calendar td {
    text-align: center;
    border: 1px solid var(--clr-border);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s ease;
    position: relative;
    height: 44px;
    vertical-align: middle;
}

@media (min-width: 540px) {
    .calendar td {
        height: 46px;
    }
}

.calendar td:hover:not(.empty):not(.weekend) {
    filter: brightness(0.93);
    transform: scale(1.05);
    z-index: 1;
}

.calendar td:active:not(.empty):not(.weekend) {
    transform: scale(0.95);
}

.calendar .empty {
    background: var(--clr-bg);
    cursor: default;
}

.calendar .weekend {
    background: var(--clr-weekend);
    color: var(--clr-weekend-text);
    cursor: default;
    font-weight: 400;
}

.calendar .holiday {
    background: var(--clr-holiday);
    color: var(--clr-holiday-text);
    font-weight: 600;
}

.calendar .office-day {
    background: var(--clr-office);
    color: var(--clr-office-text);
    font-weight: 700;
}

.calendar .wfh-day {
    background: var(--clr-wfh);
    color: var(--clr-wfh-text);
    font-weight: 500;
}

/* ===== Custom Modal ===== */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.45);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-overlay.active {
    display: flex;
    animation: modalFadeIn 0.2s ease;
}

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

.modal-card {
    background: var(--clr-surface);
    border-radius: 16px;
    padding: 28px 24px 22px;
    max-width: 340px;
    width: 100%;
    text-align: center;
    box-shadow: 0 20px 60px rgba(0,0,0,0.18);
    animation: modalSlideUp 0.25s ease;
}

@keyframes modalSlideUp {
    from { opacity: 0; transform: translateY(20px) scale(0.96); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-icon {
    font-size: 2.2rem;
    margin-bottom: 10px;
    line-height: 1;
}

.modal-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--clr-text);
    margin-bottom: 6px;
}

.modal-message {
    font-size: 0.85rem;
    color: var(--clr-text-muted);
    line-height: 1.5;
    margin-bottom: 20px;
}

.modal-actions {
    display: flex;
    gap: 10px;
    justify-content: center;
}

.modal-btn {
    flex: 1;
    padding: 10px 16px;
    border: none;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    letter-spacing: 0.02em;
}

.modal-btn:active {
    transform: scale(0.96);
}

.modal-btn-cancel {
    background: var(--clr-bg);
    color: var(--clr-text-muted);
    border: 1px solid var(--clr-border);
}

.modal-btn-cancel:hover {
    background: var(--clr-border);
}

.modal-btn-confirm {
    background: var(--clr-primary);
    color: white;
}

.modal-btn-confirm:hover {
    background: var(--clr-primary-light);
    box-shadow: 0 2px 8px rgba(30,58,95,0.25);
}

.modal-btn-danger {
    background: #dc2626;
    color: white;
}

.modal-btn-danger:hover {
    background: #b91c1c;
    box-shadow: 0 2px 8px rgba(220,38,38,0.25);
}

/* ===== Legend Bar ===== */
.legend-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    justify-content: center;
    margin-bottom: 16px;
    padding: 0 4px;
}

.legend-chip {
    font-size: 0.7rem;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 20px;
    letter-spacing: 0.02em;
}

.weekend-chip { background: var(--clr-weekend); color: var(--clr-weekend-text); }
.holiday-chip { background: var(--clr-holiday); color: var(--clr-holiday-text); }
.office-chip { background: var(--clr-office); color: var(--clr-office-text); }
.wfh-chip { background: var(--clr-wfh); color: var(--clr-wfh-text); }

/* ===== Summary ===== */
.summary {
    margin-bottom: 16px;
}

.summary-box {
    background: var(--clr-surface);
    border-radius: var(--radius);
    padding: 4px 0;
    border: 1px solid var(--clr-border);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

@media (min-width: 540px) {
    .summary-box {
        background: var(--clr-bg);
        border: none;
    }
}

.summary-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 16px;
    font-size: 0.88rem;
}

.summary-row:not(:last-child) {
    border-bottom: 1px solid var(--clr-border);
}

.summary-row span {
    color: var(--clr-text-muted);
    font-weight: 500;
}

.summary-row strong {
    font-weight: 700;
    color: var(--clr-text);
    font-size: 1rem;
}

.summary-row strong.highlight {
    color: var(--clr-primary);
    font-size: 1.1rem;
}

/* ===== Download Button ===== */
.download-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--clr-surface);
    border: 1px solid var(--clr-border);
    color: var(--clr-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition);
    padding: 0;
    box-shadow: var(--shadow-sm);
    flex-shrink: 0;
}

.download-btn:hover {
    background: var(--clr-primary);
    color: white;
    border-color: var(--clr-primary);
    box-shadow: var(--shadow-md);
}

.download-btn:active {
    transform: scale(0.93);
}

.download-btn svg {
    width: 18px;
    height: 18px;
}

/* ===== Capture Area ===== */
#capture-area {
    padding: 0;
}

/* ===== Footer ===== */
.footer {
    text-align: center;
    padding: 16px 0 8px;
    font-size: 0.8rem;
    color: var(--clr-text-muted);
}

.footer-credit {
    margin-top: 0;
}

.footer a {
    color: var(--clr-primary);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition);
}

.footer a:hover {
    color: var(--clr-accent);
}

.heart {
    color: #ef4444;
    display: inline-block;
    animation: heartbeat 1.5s infinite;
    transform-origin: center;
}

@keyframes heartbeat {
    0%, 30%, 60%, 100% { transform: scale(1); }
    15%, 45% { transform: scale(1.2); }
}

/* ===== Small phones ===== */
@media (max-width: 400px) {
    .container {
        padding: 12px 10px;
    }

    .app-header h1 {
        font-size: 1.35rem;
    }

    .stat-value {
        font-size: 1.25rem;
    }

    .stat-card {
        padding: 10px 4px 8px;
    }

    .mode-btn {
        padding: 8px 2px 6px;
    }

    .mode-icon {
        font-size: 1rem;
    }

    .mode-label {
        font-size: 0.6rem;
    }

    .calendar td {
        height: 40px;
        font-size: 0.82rem;
    }

    .calendar-header th {
        font-size: 0.65rem;
        padding: 8px 0;
    }
}

/* ===== Tablet+ ===== */
@media (min-width: 768px) {
    .calendar td {
        height: 50px;
        font-size: 0.95rem;
    }
}