@import url('https://fonts.googleapis.com/css2?family=Architects+Daughter&family=Caveat:wght@600;700&family=Courier+Prime:ital,wght@0,400;0,700;1,400;1,700&family=Inter:wght@300;400;500;600;700;900&display=swap');

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    outline: none;
    -webkit-tap-highlight-color: transparent;
}

:root {
    --font-header: 'Caveat', cursive, Georgia, serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-typewriter: 'Courier Prime', Courier, monospace;

    /* Warm desk background & natural notebook paper */
    --clr-bg: #ece5db; /* Warm desk/table underlay */
    --clr-paper: #fbf9f3; /* Realistic warm cream paper */
    --clr-rule-line: rgba(169, 203, 247, 0.45); /* Soft blueprint blue lined grid */
    --clr-margin-line: rgba(255, 120, 120, 0.6); /* Soft red vertical margin */
    --clr-ink: #2b2e2d; /* Soft graphite charcoal */
    --clr-ink-light: #5c6260;
    --clr-dots: rgba(0, 0, 0, 0.05);

    /* Pastel Highlighter Palette */
    --clr-yellow: #fff3a0;
    --clr-yellow-hover: #ffe082;
    --clr-purple: #c5cae9;
    --clr-purple-hover: #9fa8da;
    --clr-green: #c8e6c9;
    --clr-green-hover: #a5d6a7;
    --clr-orange: #ffe0b2;
    --clr-orange-hover: #ffcc80;
    --clr-red: #ffcdd2;
    --clr-red-hover: #ef9a9a;

    --border-width: 1px;
    --border-color: rgba(0, 0, 0, 0.12);
    
    /* Paper shadows */
    --shadow-paper: 0 4px 16px rgba(0, 0, 0, 0.06), 0 2px 6px rgba(0, 0, 0, 0.04);
    --shadow-stacked: 0 1px 2px rgba(0, 0, 0, 0.08), 
                      0 6px 0 -3px var(--clr-paper), 0 6px 0 -2px var(--border-color),
                      0 12px 0 -6px var(--clr-paper), 0 12px 0 -5px var(--border-color),
                      0 12px 20px -8px rgba(0,0,0,0.12);

    --transition: 0.15s ease-in-out;
    --fs-header: clamp(1.4rem, 4vw, 2.4rem);
    --fs-body: clamp(0.85rem, 2vw, 0.95rem);
    --toolbar-height: auto;
    --anim-speed: 0.15s;
}

body {
    background-color: var(--clr-paper);
    background-image: 
        linear-gradient(var(--clr-rule-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--clr-rule-line) 1px, transparent 1px);
    background-size: 24px 24px;
    font-family: var(--font-body);
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
    color: var(--clr-ink);
}

#page-loader {
    position: fixed;
    inset: 0;
    background: var(--clr-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
}

#page-loader.hidden {
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.5s ease, visibility 0.5s;
}

.loader-spinner {
    width: 50px;
    height: 50px;
    border: 3px solid rgba(0,0,0,0.06);
    border-top-color: var(--clr-ink-light);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    height: 100dvh;
    padding: clamp(6px, 1.5vw, 15px);
    gap: 12px;
    overflow: hidden;
}

/* Header & Toolbars - Stationery style */
.top-bar, .tool-bar {
    background: var(--clr-paper);
    border: var(--border-width) solid var(--border-color);
    box-shadow: var(--shadow-paper);
    padding: 8px 16px;
    display: flex;
    align-items: center;
    z-index: 100;
    flex-shrink: 0;
    gap: 15px;
    border-radius: 6px;
}

.top-bar {
    justify-content: space-between;
}

.bar-left, .bar-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

.tool-bar {
    justify-content: center;
    overflow-x: auto;
    overflow-y: visible;
    -webkit-overflow-scrolling: touch;
    white-space: nowrap;
    scrollbar-width: thin;
}

@media (max-width: 800px) {
    .tool-bar { justify-content: flex-start; }
}

.tool-bar::-webkit-scrollbar {
    height: 4px;
    display: block;
}
.tool-bar::-webkit-scrollbar-track { background: transparent; }
.tool-bar::-webkit-scrollbar-thumb { 
    background: rgba(0,0,0,0.1); 
    border-radius: 10px;
}

/* Home Button */
.home-btn {
    background: var(--clr-yellow);
    color: var(--clr-ink);
    border: 1px solid rgba(0,0,0,0.12);
    padding: 6px 14px;
    font-family: var(--font-body);
    font-weight: 700;
    text-decoration: none;
    font-size: 0.85rem;
    border-radius: 4px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    transition: var(--transition);
}

.home-btn:hover {
    background: var(--clr-yellow-hover);
    transform: translateY(-1px);
    box-shadow: 0 3px 6px rgba(0,0,0,0.08);
}

/* Room Info */
.room-info {
    font-weight: 700;
    font-size: 0.8rem;
    font-family: var(--font-typewriter);
    background: rgba(0, 0, 0, 0.03);
    padding: 5px 10px;
    border: 1px solid rgba(0,0,0,0.08);
    border-radius: 4px;
    display: flex;
    align-items: center;
    gap: 8px;
}

#room-id-display {
    max-width: 100px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.view-controls {
    display: flex;
    gap: 5px;
}

.view-controls button {
    width: 32px;
    padding: 0;
    height: 32px;
    font-size: 1rem;
    background: var(--clr-paper);
}

#reset-view {
    font-size: 0.75rem;
    font-family: var(--font-body);
    font-weight: 700;
}

.export-group {
    margin-left: auto;
}

.tool-bar .control-group {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.tool-bar button {
    min-width: 36px;
    height: 36px;
    padding: 0 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
}

/* Popover Panels (Color picker, size slider) */
.tool-sheet,
.color-picker-sheet {
    position: fixed;
    left: 0;
    top: 0;
    z-index: 1300;
    width: 184px;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px);
    transition: opacity 0.2s ease, transform 0.24s ease;
}

.tool-sheet.open,
.color-picker-sheet.open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.tool-sheet-inner,
.color-picker-sheet-inner {
    background: var(--clr-paper);
    border: 1px solid rgba(0,0,0,0.15);
    border-radius: 6px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.15);
    padding: 12px;
}

.tool-sheet-title,
.color-picker-sheet-title {
    margin-bottom: 8px;
    font-family: var(--font-body);
    font-weight: 700;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    text-align: center;
    color: var(--clr-ink-light);
}

#color-picker-widget {
    width: 150px;
    height: 150px;
    margin: 0 auto;
}

.color-picker-wrap {
    position: relative;
    display: flex;
    align-items: center;
}

#color-picker-trigger {
    width: 36px;
    min-width: 36px;
    height: 36px;
    padding: 0;
    background: var(--clr-paper);
}

#color-swatch {
    width: 20px;
    height: 20px;
    display: inline-block;
    border: 1px solid rgba(0,0,0,0.2);
    border-radius: 3px;
    background: #2b2e2d;
}

.brush-settings {
    display: flex;
    align-items: center;
    gap: 8px;
    border-left: 1px solid rgba(0,0,0,0.1);
    height: 36px;
    padding-left: 8px;
}

.size-preview-wrap {
    position: relative;
    display: flex;
    align-items: center;
    width: 48px;
    height: 36px;
    justify-content: center;
    flex-shrink: 0;
    border: 1px solid rgba(0,0,0,0.12);
    border-radius: 4px;
    background: rgba(0,0,0,0.02);
    overflow: hidden;
}

#size-toggle {
    width: 36px;
    min-width: 36px;
    height: 36px;
    padding: 0;
}

#size-preview {
    background: var(--clr-ink);
    border-radius: 50%;
    width: 4px;
    height: 4px;
    transition: width 0.12s ease, height 0.12s ease, background 0.12s ease;
}

#size-preview-value {
    position: absolute;
    right: 2px;
    bottom: 1px;
    font-size: 0.55rem;
    font-weight: 800;
    font-family: var(--font-typewriter);
    line-height: 1;
    background: var(--clr-paper);
    padding: 1px 3px;
    border-radius: 2px;
    opacity: 0.8;
}

#size-picker-popover {
    width: 188px;
}

#size-picker-popover .tool-sheet-inner {
    padding: 14px;
}

#size-picker-popover .noUi-target {
    border: 1px solid rgba(0,0,0,0.15);
    border-radius: 10px;
    background: rgba(0,0,0,0.04);
    height: 8px;
    box-shadow: none;
}

#size-picker-popover .noUi-connect {
    background: var(--clr-yellow-hover);
}

#size-picker-popover .noUi-handle {
    width: 18px;
    height: 18px;
    right: -9px;
    top: -6px;
    border: 1px solid rgba(0,0,0,0.2);
    border-radius: 50%;
    background: #fff;
    cursor: grab;
    box-shadow: 0 2px 4px rgba(0,0,0,0.15);
}

#size-picker-popover .noUi-handle::before,
#size-picker-popover .noUi-handle::after {
    display: none;
}

#size-picker-popover .noUi-horizontal .noUi-tooltip {
    bottom: calc(100% + 8px);
    border: 1px solid rgba(0,0,0,0.12);
    border-radius: 3px;
    background: #fff;
    color: var(--clr-ink);
    font-family: var(--font-typewriter);
    font-size: 0.75rem;
    padding: 2px 4px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

/* Master Button Styling */
button {
    font-family: var(--font-body);
    font-weight: 600;
    background: var(--clr-paper);
    color: var(--clr-ink);
    border: 1px solid rgba(0, 0, 0, 0.15);
    padding: 8px 16px;
    font-size: 0.85rem;
    cursor: pointer;
    border-radius: 4px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    transition: all 0.15s ease;
    white-space: nowrap;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    user-select: none;
}

button:hover { 
    background: #fff;
    border-color: rgba(0,0,0,0.25);
    transform: translateY(-1px);
    box-shadow: 0 3px 6px rgba(0,0,0,0.06); 
}

button:active { 
    transform: translateY(0); 
    box-shadow: 0 1px 2px rgba(0,0,0,0.05); 
}

button.active { 
    background: var(--clr-yellow); 
    color: var(--clr-ink); 
    border-color: rgba(0,0,0,0.2); 
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.06);
}

button.danger { 
    background: var(--clr-red); 
    color: var(--clr-ink); 
}
button.danger:hover {
    background: var(--clr-red-hover);
}

button.mini-btn { 
    padding: 3px 8px; 
    font-size: 0.7rem; 
    font-weight: 700;
    box-shadow: none; 
}

/* Active Members / Peer Info */
#peer-count {
    background: var(--clr-purple);
    color: var(--clr-ink);
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-weight: 800;
    font-family: var(--font-typewriter);
    border: 1px solid rgba(0,0,0,0.12);
    font-size: 0.75rem;
}

#chat-btn {
    position: relative;
    padding: 5px 12px;
    font-size: 0.75rem;
    font-weight: 700;
}

.notification-dot {
    position: absolute;
    top: -2px;
    right: -2px;
    width: 8px;
    height: 8px;
    background: #ef5350;
    border: 1px solid #fff;
    border-radius: 50%;
    animation: pulse-red 1.5s infinite;
}

@keyframes pulse-red {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(239, 83, 80, 0.7); }
    70% { transform: scale(1.1); box-shadow: 0 0 0 4px rgba(239, 83, 80, 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(239, 83, 80, 0); }
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #ccc;
    border: 1px solid rgba(0,0,0,0.15);
}
.status-dot.online { background: #66bb6a; }
.status-dot.offline { background: #ef5350; }

/* The Sketchbook Canvas Board */
.canvas-wrapper {
    flex: 1;
    position: relative;
    background: var(--clr-paper);
    border: var(--border-width) solid var(--border-color);
    box-shadow: var(--shadow-paper);
    overflow: hidden;
    cursor: crosshair;
    touch-action: none;
    min-height: 0;
    border-radius: 8px;
}

/* Notebook wire spiral binding on the left edge */
.canvas-wrapper::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 12px;
    width: 10px;
    background-image: linear-gradient(
        to bottom,
        transparent 0px,
        transparent 14px,
        #aaa 14px,
        #e0e0e0 16px,
        #ffffff 18px,
        #777 20px,
        transparent 20px,
        transparent 32px
    );
    background-size: 10px 32px;
    z-index: 10;
    opacity: 0.6;
    pointer-events: none;
}

/* Red notebook page margin */
.canvas-wrapper::after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 45px;
    width: 1px;
    background: var(--clr-margin-line);
    z-index: 5;
    pointer-events: none;
}

#whiteboard {
    display: block;
    width: 100%;
    height: 100%;
}

#cursors-container {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.remote-cursor {
    position: absolute;
    width: 12px;
    height: 12px;
    background: #fff;
    border: 1px solid rgba(0,0,0,0.3);
    border-radius: 50% 50% 50% 0;
    box-shadow: 1px 2px 4px rgba(0,0,0,0.1);
    transform: translate(-50%, -50%);
    pointer-events: none;
    z-index: 1000;
    will-change: left, top;
}

.cursor-label {
    position: absolute;
    top: -28px;
    left: 8px;
    background: inherit;
    color: var(--clr-ink);
    padding: 3px 6px;
    font-size: 10px;
    font-weight: 700;
    white-space: nowrap;
    border: 1px solid rgba(0,0,0,0.15);
    box-shadow: 0 2px 4px rgba(0,0,0,0.08);
    border-radius: 3px;
    pointer-events: none;
}

.cursor-label::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 4px;
    width: 0;
    height: 0;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 4px solid rgba(0,0,0,0.15);
}

/* Chat Widget - Ruled Notepad style */
.chat-modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: min(350px, 90vw);
    background: var(--clr-paper);
    border: var(--border-width) solid var(--border-color);
    box-shadow: 0 10px 30px rgba(0,0,0,0.12);
    display: flex;
    flex-direction: column;
    z-index: 1500;
    border-radius: 6px;
}

.chat-modal.hidden {
    display: none;
}

.chat-header {
    background: #8d6e63; /* Warm leather binding strap cover */
    color: #fdfaf2;
    padding: 10px 14px;
    font-family: var(--font-header);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(0,0,0,0.1);
    font-size: 1.3rem;
    letter-spacing: 0.5px;
    border-radius: 5px 5px 0 0;
}

#close-chat {
    background: rgba(255,255,255,0.25);
    color: white;
    border: none;
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    cursor: pointer;
    padding: 0;
    border-radius: 3px;
}

#close-chat:hover {
    background: rgba(255,255,255,0.4);
    transform: none;
    box-shadow: none;
}

.chat-body { 
    height: 350px; 
    max-height: 60vh;
    display: flex; 
    flex-direction: column; 
    background: var(--clr-paper);
    background-image: linear-gradient(var(--clr-rule-line) 1px, transparent 1px);
    background-size: 100% 26px;
    background-position: 0 4px;
}

#chat-messages { 
    flex: 1; 
    overflow-y: auto; 
    padding: 15px; 
    display: flex; 
    flex-direction: column; 
    gap: 12px; 
    scrollbar-width: thin;
}

.msg {
    max-width: 85%;
    padding: 8px 12px;
    border: 1px solid rgba(0,0,0,0.08);
    font-weight: 500;
    line-height: 1.4;
    position: relative;
    box-shadow: 0 2px 6px rgba(0,0,0,0.03);
    font-size: 0.85rem;
    border-radius: 5px;
}

.msg-author {
    font-family: var(--font-header);
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 2px;
    text-transform: uppercase;
    display: block;
}

.msg.sent {
    align-self: flex-end;
    background: #e8f5e9; /* Soft green pen/highlight */
    border-bottom-right-radius: 0;
    border-color: rgba(165,214,167,0.4);
}

.msg.sent .msg-author {
    color: #2e7d32;
    text-align: right;
}

.msg.received {
    align-self: flex-start;
    background: #ffffff;
    border-bottom-left-radius: 0;
}

.msg.received .msg-author {
    color: #616161;
}

#chat-form {
    padding: 10px;
    border-top: 1px solid rgba(0,0,0,0.08);
    display: flex;
    gap: 8px;
    background: white;
    border-radius: 0 0 5px 5px;
}

#chat-form input {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid rgba(0,0,0,0.12);
    border-radius: 4px;
    font-family: var(--font-body);
    font-size: 0.85rem;
    background: #fafafa;
}

#chat-form button {
    background: var(--clr-green);
    color: var(--clr-ink);
    border: 1px solid rgba(0,0,0,0.12);
    padding: 0 14px;
    font-family: var(--font-body);
    font-weight: 700;
    font-size: 0.8rem;
    border-radius: 4px;
}

/* Modals - Stacked paper sheet styles */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(43,46,45,0.45);
    backdrop-filter: blur(2px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: 20px;
}

.modal {
    background: var(--clr-paper);
    border: var(--border-width) solid var(--border-color);
    box-shadow: var(--shadow-stacked);
    padding: clamp(20px, 6vw, 36px);
    max-width: 400px;
    width: 100%;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 16px;
    border-radius: 6px;
    position: relative;
}

.modal h2 { 
    font-family: var(--font-header); 
    font-size: 2.2rem; 
    margin: 0;
    color: var(--clr-ink);
}

.modal p {
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--clr-ink-light);
}

.modal input { 
    padding: 10px 14px; 
    border: 1px solid rgba(0,0,0,0.15); 
    border-radius: 4px;
    font-size: 1rem; 
    text-align: center;
    font-family: var(--font-body);
    background: #ffffff;
}

#join-btn {
    background: var(--clr-green);
    padding: 12px;
    font-size: 1rem;
    font-weight: 700;
    width: 100%;
    margin-top: 5px;
}

.members-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-height: 220px;
    overflow-y: auto;
    padding-right: 5px;
    text-align: left;
}

.connection-pill {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(0,0,0,0.03);
    padding: 5px 10px;
    border-radius: 4px;
    border: 1px solid rgba(0,0,0,0.1);
    font-size: 0.8rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
}

.connection-pill:hover {
    background: rgba(0,0,0,0.06);
}

.member-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    background: #ffffff;
    border: 1px solid rgba(0,0,0,0.08);
    border-radius: 4px;
    font-weight: 600;
    font-size: 0.85rem;
}

.member-color {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    border: 1px solid rgba(0,0,0,0.15);
}

.member-you {
    margin-left: auto;
    font-size: 0.65rem;
    font-weight: 800;
    color: var(--clr-ink-light);
    border: 1px solid rgba(0,0,0,0.15);
    padding: 1px 4px;
    border-radius: 3px;
    background: var(--clr-yellow);
}

#close-members {
    background: var(--clr-orange);
    padding: 10px;
    margin-top: 5px;
    width: 100%;
}

.hidden { display: none !important; }

/* Responsive adjustments */
@media (max-width: 600px) {
    .app-container {
        padding: 6px;
        padding-bottom: env(safe-area-inset-bottom);
    }

    .tool-bar {
        order: 3;
        width: 100%;
        justify-content: flex-start;
        padding: 8px 10px;
        gap: 8px;
        box-shadow: 0 -2px 10px rgba(0,0,0,0.05); 
        padding-bottom: env(safe-area-inset-bottom);
        border-radius: 6px;
    }
    
    .bar-right {
        position: static;
        pointer-events: auto;
    }

    .tool-bar .control-group {
        gap: 6px;
    }

    button {
        padding: 6px 10px;
        font-size: 0.8rem;
    }
    
    .view-controls { display: none; }

    .tool-sheet,
    .color-picker-sheet {
        width: 176px;
        transform: translateY(14px);
    }

    #size-picker-popover {
        width: 180px;
    }

    .tool-sheet.open,
    .color-picker-sheet.open {
        transform: translateY(0);
    }

    .tool-sheet-inner,
    .color-picker-sheet-inner {
        box-shadow: 0 -4px 15px rgba(0,0,0,0.1);
    }

    #color-picker-widget {
        width: 142px;
        height: 142px;
    }
}