:root {
    --bg: #f5f5f5;
    --bg-card: #ffffff;
    --btn-primary: #007bff;
    --btn-primary-hover: #0056b3;
    --btn-danger: #dc3545;
    --btn-danger-hover: rgb(200, 35, 51);
    --btn-secondary: #6c757d;
    --text: #333333;
    --text-light: #666666;
    --border: #dddddd;
    --success: #28a745;
    --attention: rgb(255, 221, 0);
    --font: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --merc-accent: #ED6431; 
    --merc-dark: #2e4256;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    height: 100%;
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
}

body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    min-height: 100dvh;
}

/* Header */
header {
    background: var(--btn-primary);
    color: white;
    padding: 1rem;
    text-align: center;
    flex-shrink: 0;
}

header h1 {
    font-size: 1.5rem;
    font-weight: 600;
}

/* Navigation */
nav {
    display: flex;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

nav button {
    flex: 1;
    padding: 1rem;
    font-size: 1rem;
    font-family: var(--font);
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    color: var(--text-light);
    cursor: pointer;
    transition: all 0.2s;
}

nav button.active {
    color: var(--btn-primary);
    border-bottom-color: var(--btn-primary);
    font-weight: 600;
}

nav button:hover {
    background: var(--bg);
}

/* Main content */
main {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
}

.screen {
    display: none;
    height: 100%;
}

.screen.active {
    display: flex;
    flex-direction: column;
}

#last-log {
    /* padding: 0.75rem 0; */
    /* border-bottom: 1px solid var(--border); */


    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    margin-bottom: 1rem;
    padding: 1rem;

    padding-bottom: 1rem;
    font-family: monospace;
    font-size: 0.95rem;
    line-height: 1.4;
    word-break: break-word;
}

/* Location buttons (Main screen) */
#main-screen .locations-grid {
    /* display: flex;
    flex-direction: column; */
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.location-btn {
    min-height: 80px;
    padding: 1.5rem 1.5rem;
    font-size: 1.2rem;
    font-weight: 600;
    font-family: var(--font);
    background: var(--btn-primary);
    color: white;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.15s;
    text-align: center;
    word-break: break-word;
    user-select: none;
}

.location-btn:hover {
    background: var(--btn-primary-hover);
    transform: scale(1.02);
}

.location-btn:active {
    transform: scale(0.98);
}

/* Split location buttons (Arrive/Depart) */
.location-btn-split {
    display: flex;
    position: relative;
    min-height: 80px;
    border-radius: 12px;
    overflow: hidden;
    background: var(--btn-primary);
    user-select: none;
}

.location-btn-split .split-left,
.location-btn-split .split-right {
    flex: 1;
    padding: 0.75rem 0.5rem;
    font-size: 0.5rem;
    font-family: var(--font);
    color: white;
    background: transparent; 
    border: none;
    cursor: pointer;
    transition: all 0.15s;
}

.location-btn-split .split-right {
    background: rgba(0, 0, 0, .1);
}

.location-btn-split .split-left:hover,
.location-btn-split .split-right:hover {
    background: rgba(0, 0, 0, .3);
}

.location-btn-split .split-label {
    padding: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    color: white;
    word-break: break-word;
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    width: 100%;
    text-align: center;
    pointer-events: none;
    padding: 1em;
    box-sizing: border-box;
    user-select: none;
}

/* Manual entry button */
.location-btn.manual-btn {
    background: var(--btn-secondary);
}

.location-btn.manual-btn:hover {
    background: #5a6268;
}

/* Overlay */
.overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.overlay.show {
    display: flex;
}

.overlay-card {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 1.5rem;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.overlay-card h2 {
    margin: 0 0 1rem 0;
    font-size: 1.25rem;
    color: var(--text);
}

.overlay-card input {
    width: 100%;
    padding: 1rem;
    font-size: 1.2rem;
    font-family: var(--font);
    border: 2px solid var(--border);
    border-radius: 8px;
    margin-bottom: 1rem;
}

.overlay-card input:focus {
    outline: none;
    border-color: var(--btn-primary);
}

.overlay-card-actions {
    display: flex;
    gap: 0.5rem;
    justify-content: flex-end;
}

.overlay-card-actions button {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-family: var(--font);
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

.overlay-card-cancel {
    background: var(--bg);
    color: var(--text);
}

.overlay-card-cancel:hover {
    background: var(--border);
}

.overlay-card-submit {
    background: var(--btn-primary);
    color: white;
}

.overlay-card-submit:hover {
    background: var(--btn-primary-hover);
}

/* Passenger count card overlay */

.pax-card input {
    text-align: center;
}

.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-light);
}

.empty-state p {
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

/* Manage screen */
#manage-screen .add-form {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

#manage-screen .add-form input {
    flex: 1;
    padding: 1rem;
    min-width: 0;
    font-size: 1.2rem;
    font-family: var(--font);
    border: 2px solid var(--border);
    border-radius: 8px;
}

#manage-screen .add-form input:focus {
    outline: none;
    border-color: var(--btn-primary);
}

.manage-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.manage-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-card);
    padding: 0.75rem;
    border-radius: 8px;
    border: 1px solid var(--border);
}

.manage-item .reorder-btns {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.manage-item .reorder-btns button {
    padding: 0.25rem 0.5rem;
    font-size: 0.9rem;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 4px;
    cursor: pointer;
    line-height: 1;
}

.manage-item .reorder-btns button:hover {
    background: var(--border);
}

.manage-item .reorder-btns button:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.manage-item .location-name {
    flex: 1;
    padding: 0.75rem;
    min-width: 0;
    font-size: 1.2rem;
    font-family: var(--font);
    border: 1px solid transparent;
    border-radius: 4px;
    background: transparent;
    cursor: text;
}

.manage-item .location-name:focus {
    outline: none;
    border-color: var(--btn-primary);
    background: white;
}

.manage-item .delete-btn {
    padding: 0.75rem 1rem;
    font-size: 1.2rem;
    background: var(--bg-card);
    color: var(--btn-danger);
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

/* Log screen */
#log-screen {
    gap: 1rem;
}

#log-screen .log-actions {
    display: flex;
    gap: 0.5rem;
    flex-shrink: 0;
}

#log-screen .log-actions button {
    padding: 0.75rem 1rem;
    font-size: 1rem;
    font-family: var(--font);
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

#log-screen .clear-btn {
    background: var(--btn-danger);
    color: white;
}

#log-screen .clear-btn:hover {
    background: var(--btn-danger-hover);
}

#log-screen .export-btn {
    flex: 1;
    background: var(--btn-primary);
    color: white;
}

#log-screen .export-btn:hover {
    background: var(--btn-primary-hover);
}

.log-list {
    flex: 1;
    overflow-y: auto;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
}

.log-list .log-list-entry {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border);
    font-family: monospace;
    font-size: 0.95rem;
    line-height: 1.4;
    word-break: break-word;
}

.log-date {
    color:#dddddd;
}

.log-list .log-list-entry:last-child {
    border-bottom: none;
}

.log-list .log-list-entry.new-day {
    /* border-top: 1px solid var(--border); */
    margin-top: 2rem;
}

/* Settings screen */
.settings-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.settings-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    background: var(--bg-card);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--border);
}

.settings-item label {
    flex: 1;
    cursor: pointer;
}

.settings-label {
    display: block;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
}

.settings-description {
    display: block;
    font-size: 0.85rem;
    color: var(--text-light);
    margin-top: 0.25rem;
}

.settings-toggle {
    width: 50px;
    height: 28px;
    appearance: none;
    background: var(--border);
    border-radius: 14px;
    position: relative;
    cursor: pointer;
    transition: background 0.2s;
    flex-shrink: 0;
}

.settings-toggle::before {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 24px;
    height: 24px;
    background: white;
    border-radius: 50%;
    transition: transform 0.2s;
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.settings-toggle:checked {
    background: var(--btn-primary);
}

.settings-toggle:checked::before {
    transform: translateX(22px);
}

#credit {
    padding: 1rem;
    color: var(--text-light);
    font-size: .8rem;;
}

#version {
    display: block;
    padding: 1rem;
    text-align: center;
}

#credit a {
    color: var(--btn-primary);
}

/* Toast notification */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--success);
    color: white;
    padding: 1rem 2rem;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1000;
    text-align: center;
    max-width: 90%;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}


/* ============ Desktop ============ */

@media (min-width: 768px) {
    main {
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
    }

    #main-screen .locations-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    }
}



/* ============ Dark Mode ============ */

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #000000;
        --bg-card: #2e2e2e;
        --btn-primary: #ff0000;
        --btn-primary-hover: #ba0000;
        --btn-danger: var(--btn-primary);
        --btn-danger-hover: #c82333;
        --btn-secondary: #6c757d;
        --text: #c40000;
        --text-light: #8b0000;
        --border: #1f1f1f;
        --success: #28a745;
        --attention: rgb(255, 221, 0);
        --font: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
        --merc-accent: #ED6431; 
        --merc-dark: #2e4256;
    }

/* Navigatoion */
    
    nav {
        background: transparent;
        border-bottom: 1px solid var(--border);
    }
    
    nav button {
        background: transparent;
        border-bottom: 3px solid transparent;
        color: var(--text-light);
    }
    
    nav button.active {
        color: var(--btn-primary);
        border-bottom-color: var(--btn-primary);
    }
    
    nav button:hover {
        background: var(--bg);
    }

/* Main screen */


    #last-log {
        background: transparent;
        border: 1px solid var(--border);
    }

    .location-btn.manual-btn {
        background: transparent;
        color: var(--btn-primary);
        border: 1px solid var(--btn-primary);
    }

    .location-btn {
        background: transparent;
        color: var(--btn-primary);
        border: 1px solid var(--btn-primary);
    }
    
    .location-btn:hover {
        background: var(--btn-primary-hover);
    }

    .location-btn-split {
        background: transparent;
        color: var(--btn-primary);
        border: 1px solid var(--btn-primary);
    }

    .location-btn-split .split-left,
    .location-btn-split .split-right {
        color: var(--bg);
        background: transparent; 
    }

    .location-btn-split .split-right {
        background: rgba(255, 0, 0, 0.15);
    }

    .location-btn-split .split-label {
        color: var(--btn-primary);
    }

/* Manage screen */

    #manage-screen .add-form input {
        flex: 1;
        padding: 1rem;
        min-width: 0;
        font-size: 1.2rem;
        font-family: var(--font);
        border: 2px solid var(--border);
        border-radius: 8px;
    }

    #manage-screen .add-form input:focus {
        outline: none;
        border-color: var(--btn-primary);
    }

    .manage-item {
        background: transparent;
        border: 1px solid var(--border);
    }
    
    .manage-item .reorder-btns {
    }
    
    .manage-item .reorder-btns button {
        background: var(--bg);
        border: none;
        color: var(--btn-danger);
    }
    
    .manage-item .reorder-btns button:hover {
        background: var(--border);
    }
    
    .manage-item .reorder-btns button:disabled {
        opacity: 0.3;
    }
    
    .manage-item .location-name {
        border: 1px solid transparent;
        background: transparent;
        color: var(--btn-danger);
    }
    
    .manage-item .location-name:focus {
        border-color: var(--btn-primary);
        background: var(--btn-danger);
        color: var(--bg);
    }
    
    .manage-item .delete-btn {
        padding: 0.75rem 1rem;
        font-size: 1.2rem;
        background: var(--bg);
        color: var(--btn-danger);
        border: none;
        border-radius: 8px;
        cursor: pointer;
    }

/* Logbook screen */

    #log-screen .log-actions button {
        border: 1px solid var(--btn-primary);
        border-radius: 8px;
        background-color: var(--bg);
        color: var(--btn-primary);
    }

    .log-list {
        background: var(--bg);
    }
    
    .log-date {
        color: var(--text-light);
    }

/* Settings screen */
    
    .settings-item {
        background: transparent;
        border-color: var(--btn-primary-hover);
    }

    .settings-toggle::before {
        background-color: var(--bg);
    }

/* Utilities */

    .toast {
        background: var(--btn-danger);
        color: var(--bg);
    }

    .overlay {
        background: rgba(0, 0, 0, 0.85);
    }

    .overlay-card {
        background: rgba(0, 0, 0, 0.5);
        border: 1px solid var(--border);
        box-shadow: 0 0 20px rgba(200, 35, 51, 0.5);
    }
    
    .overlay-card h2 {
        color: var(--text);
    }
    
    .overlay-card input,
    #manage-screen .add-form input {
        border: 2px solid var(--btn-primary);
        background-color: transparent;
        color: var(--text);
    }

    .overlay-card input::placeholder,
    #manage-screen .add-form input::placeholder {
        color: var(--text-light);
    }
    
    .overlay-card input:focus {
        outline: none;
        border-color: var(--btn-primary);
    }
    
    .overlay-card-cancel {
        background: var(--bg);
        color: var(--text);
    }
    
    .overlay-card-cancel:hover {
        background: var(--border);
    }
    
    .overlay-card-submit {
        background: var(--btn-primary);
        color: var(--bg);
    }
    
    .overlay-card-submit:hover {
        background: var(--btn-primary-hover);
    }
}