/* ==========================================================================
   1. Core Variables & Theme Setup
   ========================================================================== */
:root {
    --bg-color-light: #f0f0f0;
    --text-color-light: #2c3e50;
    --panel-bg-light: rgba(255, 255, 255, 0.9);
    --panel-border-light: #ccc;
    --item-hover-light: #e0e0e0;

    --bg-color-dark: #000000;
    --text-color-dark: #ecf0f1;
    --panel-bg-dark: rgba(20, 20, 20, 0.9);
    --panel-border-dark: #333;
    --item-hover-dark: #3a3a3a;

    --bg-color: var(--bg-color-dark);
    --text-color: var(--text-color-dark);
    --panel-bg: var(--panel-bg-dark);
    --panel-border: var(--panel-border-dark);
    --item-hover: var(--item-hover-dark);

    --transition-speed: 0.3s;
}

.light-theme {
    --bg-color: var(--bg-color-light);
    --text-color: var(--text-color-light);
    --panel-bg: var(--panel-bg-light);
    --panel-border: var(--panel-border-light);
    --item-hover: var(--item-hover-light);
}

/* ==========================================================================
   2. Global Styles & Body
   ========================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    width: 100%;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
    background-size: cover;
    background-position: center;
}

/* ==========================================================================
   3. Main App & Canvas Container
   ========================================================================== */
#background-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0; /* Behind the clock */
    display: none;
}

#app-container {
    position: relative;
    z-index: 1; /* Above the canvas */
    width: 100%;
    height: 100%;
}

/* ==========================================================================
   4. Clock Display & Responsive Sizing
   ========================================================================== */
#clock-wrapper {
    position: absolute;
    text-align: center;
    user-select: none;
    padding: 20px;
    border-radius: 10px;
    transition: border 0.3s ease, top 0.4s ease, left 0.4s ease, width 0.2s ease, transform 0.4s ease;

    /* NEW: Responsive width using clamp() */
    width: clamp(150px, 50vw, 1000px);
}

#clock-wrapper.edit-mode {
    border: 2px dashed var(--text-color);
    cursor: grab;
}

#clock-wrapper.dragging {
    cursor: grabbing;
    transition: none;
}

#time-display {
    font-weight: 600;
    line-height: 1;
    /* NEW: Responsive font size using clamp() */
    font-size: clamp(30px, 8vw, 150px);
}

#am-pm {
    font-weight: 300;
    margin-left: 0.2em;
    /* NEW: Responsive font size using clamp() */
    font-size: clamp(12px, 3vw, 40px);
}

#date-display {
    font-weight: 300;
    margin-top: 0.5em;
    /* NEW: Responsive font size using clamp() */
    font-size: clamp(14px, 2.5vw, 50px);
}

/* ==========================================================================
   5. Settings Panel & UI Elements
   ========================================================================== */
#settings-button {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--panel-bg);
    color: var(--text-color);
    border: 1px solid var(--panel-border);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    font-size: 24px;
    backdrop-filter: blur(5px);
    transition: all var(--transition-speed) ease;
    z-index: 1000;
}

#settings-button:hover {
    transform: scale(1.1);
}

#settings-panel {
    position: fixed;
    top: 0;
    right: -100%;
    width: 320px;
    max-width: 90vw;
    height: 100%;
    background: var(--panel-bg);
    border-left: 1px solid var(--panel-border);
    backdrop-filter: blur(10px);
    transition: right 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    z-index: 999;
    display: flex;
    flex-direction: column;
}

#settings-panel.open {
    right: 0;
}

.panel-header {
    display: flex;
    align-items: center;
    padding: 15px;
    border-bottom: 1px solid var(--panel-border);
    flex-shrink: 0;
}

.panel-back-button {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 24px;
    cursor: pointer;
    margin-right: 15px;
}

.panel-title {
    font-size: 1.2em;
    font-weight: 600;
}

.panel-content {
    flex-grow: 1;
    overflow-y: auto;
}

.panel-page {
    display: none;
}

.panel-page.active {
    display: block;
}

.setting-item, .setting-group {
    padding: 15px 20px;
    border-bottom: 1px solid var(--panel-border);
}

.setting-item {
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.2s ease;
}

.setting-item:hover {
    background-color: var(--item-hover);
}

.setting-item .arrow {
    font-size: 1.2em;
}

label.setting-item {
    padding: 0;
}

.toggle-switch {
    width: 50px;
    height: 26px;
    background: #ccc;
    border-radius: 13px;
    position: relative;
    cursor: pointer;
}

.toggle-switch .knob {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 22px;
    height: 22px;
    background: white;
    border-radius: 50%;
    transition: transform 0.2s ease;
}

.toggle-switch.active {
    background: #4CAF50;
}

.toggle-switch.active .knob {
    transform: translateX(24px);
}

.setting-group label {
    display: block;
    margin-bottom: 10px;
    font-weight: 500;
}

.setting-group select, .setting-group input, .setting-group .button-group {
    width: 100%;
}

.setting-group input[type="color"] {
    height: 40px;
    padding: 0 2px;
}

.button-group {
    display: flex;
}

.button-group button {
    flex-grow: 1;
    padding: 8px;
    border: 1px solid var(--panel-border);
    background: none;
    color: var(--text-color);
    cursor: pointer;
}

.button-group button:first-child {
    border-radius: 5px 0 0 5px;
}

.button-group button:last-child {
    border-radius: 0 5px 5px 0;
}

.button-group button.active {
    background: var(--text-color);
    color: var(--bg-color);
}

.size-controls {
    display: flex;
    align-items: center;
}

.size-controls button {
    width: 40px;
    height: 40px;
    font-size: 20px;
    border: 1px solid var(--panel-border);
    background: var(--item-hover);
}

.size-controls input[type="range"] {
    flex-grow: 1;
    margin: 0 5px;
}

.sub-group {
    display: none;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px dashed var(--panel-border);
}

.sub-group.visible {
    display: block;
}

.menu-title {
    padding: 20px 20px 10px;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.7;
    font-weight: 600;
    border-bottom: 1px solid var(--panel-border);
}