:root {
    /* Toss-like Dark Mode */
    --background-color: #1a1a1e;
    --text-color: #f0f0f0;
    --primary-color: #3182f6; /* Toss blue */
    --container-bg-color: #2b2b30;
    --gradient-start: #3182f6;
    --gradient-end: #6b46ef; /* Purple-ish accent for gradient */
    --shadow-color: rgba(0, 0, 0, 0.4);
    --grid-color: rgba(255, 255, 255, 0.08);
    --btn-text-color: #f0f0f0;
    --btn-active-bg: #3182f6;
    --btn-active-text: #ffffff;
    --btn-hover-bg: rgba(49, 130, 246, 0.2);
    --input-bg-color: #3b3b40;
}

.light-mode {
    /* Toss-like Light Mode */
    --background-color: #ffffff;
    --text-color: #212124;
    --primary-color: #3182f6; /* Toss blue */
    --container-bg-color: #f8f8fa;
    --gradient-start: #3182f6;
    --gradient-end: #6b46ef;
    --shadow-color: rgba(0, 0, 0, 0.08);
    --grid-color: rgba(0, 0, 0, 0.05);
    --btn-text-color: #212124;
    --btn-active-bg: #3182f6;
    --btn-active-text: #ffffff;
    --btn-hover-bg: rgba(49, 130, 246, 0.1);
    --input-bg-color: #f0f2f5;
}


body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    /* Removed background-image for cleaner Toss-like look */
    transition: background-color 0.3s ease, color 0.3s ease;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    width: 100%;
    box-sizing: border-box;
    background-color: var(--container-bg-color);
    box-shadow: 0 2px 5px var(--shadow-color);
    z-index: 100;
}

.top-nav {
    display: flex;
    justify-content: center;
    width: 100%;
    background-color: var(--container-bg-color);
    padding: 0.5rem 0;
    box-shadow: 0 1px 3px var(--shadow-color);
    border-bottom: 1px solid var(--grid-color);
}

.nav-tab {
    background-color: transparent;
    color: var(--text-color);
    border: none;
    padding: 0.8rem 1.6rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: 6px;
    transition: background-color 0.2s ease, color 0.2s ease;
    position: relative;
    overflow: hidden;
}

.nav-tab:hover {
    background-color: var(--btn-hover-bg);
}

.nav-tab.active {
    color: var(--primary-color);
}

.nav-tab.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 2px;
}

.main-content {
    display: flex;
    flex: 1;
    width: 100%;
    padding: 1.5rem 2rem;
    box-sizing: border-box;
    gap: 2rem;
}

.sidebar {
    width: 300px;
    flex-shrink: 0;
    background-color: var(--container-bg-color);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 4px 15px var(--shadow-color);
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.search-container {
    margin-bottom: 0.5rem;
}

#search-input {
    width: calc(100% - 1.5rem);
    padding: 0.75rem;
    border-radius: 8px;
    border: 1px solid var(--grid-color);
    background-color: var(--input-bg-color);
    color: var(--text-color);
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

#search-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(49, 130, 246, 0.3);
}

.asset-list {
    list-style: none;
    padding: 0;
    margin: 0;
    overflow-y: auto;
    flex: 1;
}

.asset-item {
    padding: 1rem 0.8rem;
    cursor: pointer;
    border-radius: 8px;
    margin-bottom: 0.4rem;
    transition: background-color 0.2s ease;
    font-size: 0.95rem;
    font-weight: 500;
}

.asset-item:hover {
    background-color: var(--btn-hover-bg);
}

.asset-item.active {
    background-color: var(--primary-color);
    color: var(--btn-active-text);
    font-weight: bold;
}

.content-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.chart-container {
    width: 100%;
    flex: 1;
    min-height: 400px;
    background-color: var(--container-bg-color);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 15px var(--shadow-color);
    position: relative;
    transition: background-color 0.3s ease;
    box-sizing: border-box;
}

.chart-container::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 12px;
    padding: 2px;
    background: linear-gradient(45deg, var(--gradient-start), var(--gradient-end));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}


canvas {
    width: 100% !important;
    height: 100% !important;
}

h1 {
    font-size: 1.8rem;
    margin: 0;
    color: var(--primary-color);
    /* Removed text-shadow for cleaner Toss-like look */
}

#price-info {
    display: flex;
    align-items: baseline; /* Align items to the bottom for a cleaner look */
    gap: 1rem;
    font-size: 1.4rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

#asset-name {
    margin: 0;
    font-size: 2.2rem; /* Larger font size for asset name */
    font-weight: 700;
    color: var(--text-color);
}

#current-price {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--text-color);
}


#price-change {
    font-size: 1.1rem;
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    background-color: var(--container-bg-color); /* Neutral background */
    font-weight: 500;
    display: inline-flex; /* To make padding effective */
    align-items: center;
    justify-content: center;
}

/* Specific colors for price change text (overriding general text color) */
#price-change[style*="color: rgb(76, 175, 80)"] { /* Green */
    color: #4CAF50 !important;
}
#price-change[style*="color: rgb(244, 67, 54)"] { /* Red */
    color: #F44336 !important;
}


#timeframe-controls {
    margin-bottom: 1rem;
    display: flex;
    gap: 0.5rem;
    align-self: flex-start;
    background-color: var(--container-bg-color);
    padding: 0.3rem;
    border-radius: 8px;
    box-shadow: 0 1px 3px var(--shadow-color);
}

.timeframe-btn {
    background-color: transparent;
    color: var(--text-color);
    border: none;
    padding: 0.6rem 1.2rem;
    font-size: 0.9rem;
    cursor: pointer;
    border-radius: 6px;
    transition: background-color 0.2s ease, color 0.2s ease;
    font-weight: 500;
}

.timeframe-btn:hover {
    background-color: var(--btn-hover-bg);
}

.timeframe-btn.active {
    background-color: var(--primary-color);
    color: var(--btn-active-text);
    font-weight: bold;
    box-shadow: 0 1px 5px rgba(49, 130, 246, 0.3);
}

.theme-switcher {
    position: relative;
    /* Adjust positioning to be part of the header flex flow */
}

.theme-switcher label {
    cursor: pointer;
    display: flex; /* Use flex for alignment */
    align-items: center;
    justify-content: space-between;
    width: 60px; /* Slightly wider */
    height: 30px; /* Taller */
    background-color: var(--input-bg-color); /* Match input background */
    border-radius: 25px;
    position: relative;
    transition: background-color 0.3s ease;
    padding: 0 5px; /* Add padding for icons/text inside */
}

.theme-switcher label::before,
.theme-switcher label::after {
    content: '';
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-size: 14px; /* Icon size */
    color: #ccc; /* Default icon color */
    transition: color 0.3s ease;
}

.theme-switcher label::before {
    content: '☀️'; /* Sun icon for light mode */
    left: 8px;
    color: var(--text-color);
}

.theme-switcher label::after {
    content: '🌙'; /* Moon icon for dark mode */
    right: 8px;
    color: var(--text-color);
}


.theme-switcher input:checked + label {
    background-color: var(--primary-color);
}

.theme-switcher input:checked + label::before {
    color: var(--btn-active-text);
}

.theme-switcher input:checked + label::after {
    color: #ffffff; /* Moon icon visible when checked */
}


.theme-switcher label::after {
    content: ''; /* Hide moon initially */
    display: block;
    width: 26px; /* Slightly larger toggle circle */
    height: 26px;
    background-color: #fff;
    border-radius: 50%;
    position: absolute;
    top: 2px;
    left: 2px;
    transition: transform 0.3s ease;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.theme-switcher input:checked + label::after {
    transform: translateX(30px); /* Move further for wider toggle */
}

.light-mode .theme-switcher label {
    background-color: var(--input-bg-color);
}

.light-mode .theme-switcher label::before {
    color: var(--text-color);
}

.light-mode .theme-switcher input:checked + label::after {
    background-color: #fff;
}

.placeholder-content {
    padding: 3rem;
    text-align: center;
    background-color: var(--container-bg-color);
    border-radius: 12px;
    box-shadow: 0 4px 15px var(--shadow-color);
    flex: 1; /* Take up available space */
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.placeholder-content h3 {
    font-size: 2rem;
    color: var(--text-color);
    margin-bottom: 1rem;
}

.placeholder-content p {
    font-size: 1.2rem;
    color: var(--text-color);
}