/* ===== CSS Variables - Light Theme (default) ===== */
:root {
    --bg-primary: #f5f5f7;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --accent: #007aff;
    --accent-hover: #0056b3;
    --success: #34c759;
    --warning: #ff9500;
    --border: #d2d2d7;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --radius: 12px;
    --radius-sm: 8px;

    /* Type colors */
    --type-essential: #34c759;
    --type-lifestyle: #007aff;
    --type-discretionary: #ff9500;
}

/* ===== Dark Theme ===== */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #000000;
        --bg-secondary: #1c1c1e;
        --bg-card: #2c2c2e;
        --text-primary: #f5f5f7;
        --text-secondary: #8e8e93;
        --accent: #0a84ff;
        --accent-hover: #409cff;
        --success: #30d158;
        --warning: #ff9f0a;
        --border: #38383a;
        --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);

        /* Type colors - brighter for dark mode */
        --type-essential: #30d158;
        --type-lifestyle: #0a84ff;
        --type-discretionary: #ff9f0a;
    }
}

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

html {
    height: 100%;
}

body {
    min-height: 100%;
    min-height: 100dvh;
    /* Dynamic viewport height - adjusts for keyboard */
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

/* ===== App Container ===== */
#app {
    max-width: 480px;
    margin: 0 auto;
    min-height: 100%;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
}

.screen {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 20px;
}

.hidden {
    display: none !important;
}

/* ===== Login Screen ===== */
#login-screen {
    justify-content: center;
    align-items: center;
}

.login-container {
    text-align: center;
    padding: 40px;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.login-container h1 {
    font-size: 2rem;
    margin-bottom: 10px;
}

.login-container p {
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.google-btn {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 14px 28px;
    background: white;
    color: #333;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.google-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 255, 255, 0.1);
}

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

/* ===== Header ===== */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

header h1 {
    font-size: 1.5rem;
}

.sync-status {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.sync-status.syncing {
    color: var(--warning);
}

.sync-status.synced {
    color: var(--success);
}

/* ===== Amount Section ===== */
.amount-section {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 20px;
    overflow: hidden;
}

.currency-amount {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    overflow: hidden;
}

.currency-select {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 12px;
    font-size: 1rem;
    cursor: pointer;
}

#amount {
    flex: 1;
    min-width: 0;
    max-width: 100%;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 2.5rem;
    font-weight: 600;
    text-align: right;
    outline: none;
    box-sizing: border-box;
    -moz-appearance: textfield;
    /* Firefox */
    appearance: textfield;
}

/* Hide spinner buttons */
#amount::-webkit-outer-spin-button,
#amount::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

#amount::placeholder {
    color: var(--text-secondary);
    opacity: 0.5;
}

/* ===== Rate Input Section ===== */
.rate-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}

.rate-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.rate-row input {
    flex: 1;
    max-width: 100px;
    padding: 8px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 1rem;
    text-align: right;
}

.rate-source {
    font-size: 0.75rem;
    padding: 2px 8px;
    border-radius: 10px;
    text-transform: uppercase;
}

.rate-api,
.rate-cache {
    background: var(--success);
    color: white;
}

.rate-stale {
    background: var(--warning);
    color: black;
}

.rate-manual {
    background: var(--text-secondary);
    color: white;
}

/* ===== RM Preview (inline) ===== */
.rate-separator {
    color: var(--text-secondary);
    margin: 0 4px;
}

.rm-preview {
    font-size: 1rem;
    color: var(--text-secondary);
    white-space: nowrap;
}

.rm-preview #rm-amount {
    font-weight: 600;
    color: var(--accent);
}

/* ===== Sections ===== */
.section {
    margin-bottom: 20px;
}

.section label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ===== Button Grid ===== */
.button-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 8px;
}

.button-grid button {
    padding: 12px 8px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.button-grid button:hover {
    background: var(--bg-card);
    border-color: var(--accent);
}

.button-grid button.selected {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

/* ===== Type Grid (colour variants) ===== */
.type-grid button[data-value="Essential"] {
    border-color: var(--type-essential);
}

.type-grid button[data-value="Essential"]:hover {
    background: color-mix(in srgb, var(--type-essential) 20%, transparent);
    border-color: var(--type-essential);
}

.type-grid button[data-value="Essential"].selected {
    background: var(--type-essential);
    border-color: var(--type-essential);
    color: #000;
}

.type-grid button[data-value="Lifestyle"] {
    border-color: var(--type-lifestyle);
}

.type-grid button[data-value="Lifestyle"]:hover {
    background: color-mix(in srgb, var(--type-lifestyle) 20%, transparent);
    border-color: var(--type-lifestyle);
}

.type-grid button[data-value="Lifestyle"].selected {
    background: var(--type-lifestyle);
    border-color: var(--type-lifestyle);
    color: white;
}

.type-grid button[data-value="Discretionary"] {
    border-color: var(--type-discretionary);
}

.type-grid button[data-value="Discretionary"]:hover {
    background: color-mix(in srgb, var(--type-discretionary) 20%, transparent);
    border-color: var(--type-discretionary);
}

.type-grid button[data-value="Discretionary"].selected {
    background: var(--type-discretionary);
    border-color: var(--type-discretionary);
    color: #000;
}

/* ===== DateTime Input ===== */
.datetime-section {
    margin-bottom: 16px;
}

.datetime-input {
    width: 100%;
    padding: 12px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    cursor: pointer;
}

.datetime-input:focus {
    border-color: var(--accent);
    outline: none;
}

.datetime-row {
    display: flex;
    gap: 10px;
    align-items: center;
}

.datetime-row .datetime-input {
    flex: 1;
}

.now-btn {
    padding: 12px 16px;
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
}

.now-btn:active {
    background: var(--bg-secondary);
}

/* ===== Subcategory Select ===== */
.subcategory-select {
    width: 100%;
    padding: 12px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    cursor: pointer;
}

.subcategory-select:focus {
    border-color: var(--accent);
    outline: none;
}

/* ===== Trip Select ===== */
.trip-select {
    width: 100%;
    padding: 12px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    cursor: pointer;
}

.trip-select:focus {
    border-color: var(--accent);
    outline: none;
}

/* ===== Note Input ===== */
#note {
    width: 100%;
    padding: 14px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
}

#note:focus {
    border-color: var(--accent);
}

#note::placeholder {
    color: var(--text-secondary);
}

/* ===== Submit Button ===== */
.submit-btn {
    width: 100%;
    padding: 16px;
    margin-top: auto;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
}

.submit-btn:hover:not(:disabled) {
    background: var(--accent-hover);
}

.submit-btn:active:not(:disabled) {
    transform: scale(0.98);
}

.submit-btn:disabled {
    background: var(--border);
    color: var(--text-secondary);
    cursor: not-allowed;
}

/* ===== Queue Indicator ===== */
.queue-indicator {
    text-align: center;
    padding: 10px;
    margin-top: 10px;
    background: var(--warning);
    color: #000;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
}

/* ===== Toast ===== */
.toast {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%);
    padding: 14px 24px;
    background: var(--bg-card);
    color: var(--text-primary);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    z-index: 1000;
    transition: opacity 0.3s, transform 0.3s;
}

.toast.hidden {
    opacity: 0;
    transform: translateX(-50%) translateY(20px);
    pointer-events: none;
}

.toast.success {
    background: var(--success);
    color: #000;
}

.toast.error {
    background: var(--accent);
}

/* ===== Loading State ===== */
.loading {
    opacity: 0.7;
    pointer-events: none;
}

/* ===== PWA Install Banner (if needed) ===== */
@media (display-mode: standalone) {
    body {
        padding-top: env(safe-area-inset-top);
    }
}