:root {
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --header-color: #ffffff;
    --button-bg: #3f51b5;
    --button-hover: #5c6bc0;
    --shadow: rgba(0,0,0,0.5);
    --input-bg: #2d2d2d;
    --border-color: #333;
    --up-color: #00c853;
    --down-color: #ff5252;
}

[data-theme="light"] {
    --bg-color: #f5f5f5;
    --card-bg: #ffffff;
    --text-color: #2c3e50;
    --header-color: #2c3e50;
    --button-bg: #4a90e2;
    --button-hover: #357abd;
    --shadow: rgba(0,0,0,0.1);
    --input-bg: #ffffff;
    --border-color: #ddd;
    --up-color: #00a846;
    --down-color: #d32f2f;
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    transition: all 0.3s ease;
}

header {
    width: 100%;
    padding: 40px 20px;
    background: var(--card-bg);
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: 0 4px 10px var(--shadow);
    box-sizing: border-box;
}

h1 {
    color: var(--header-color);
    margin: 0 0 20px 0;
    font-size: 2rem;
    font-weight: 700;
}

.search-container {
    display: flex;
    gap: 10px;
    width: 100%;
    max-width: 500px;
}

#ticker-input {
    flex: 1;
    padding: 12px 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: var(--input-bg);
    color: var(--text-color);
    font-size: 1rem;
    outline: none;
}

#search-btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    background-color: var(--button-bg);
    color: white;
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.2s;
}

#search-btn:hover { background-color: var(--button-hover); }

main {
    width: 95%;
    max-width: 1200px;
    margin: 30px auto;
    padding: 20px;
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 8px 20px var(--shadow);
    box-sizing: border-box;
}

#stock-info {
    margin-bottom: 30px;
    text-align: center;
}

#stock-name { font-size: 1.8rem; margin: 0 0 10px 0; }

.price-info { font-size: 1.5rem; font-weight: bold; }

#current-price { margin-right: 15px; }

.up { color: var(--up-color); }
.down { color: var(--down-color); }

#chart-container {
    width: 100%;
    min-height: 500px;
    background: var(--input-bg);
    border-radius: 8px;
    padding: 10px;
    box-sizing: border-box;
}

.hidden { display: none !important; }

/* Spinner */
.spinner {
    width: 40px; height: 40px;
    border: 4px solid rgba(255,255,255,0.1);
    border-left: 4px solid var(--button-bg);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}
@keyframes spin { to { transform: rotate(360deg); } }

#loading, #error-msg { text-align: center; padding: 50px; }

.theme-switch-wrapper {
    position: absolute;
    top: 20px;
    right: 20px;
}

#theme-toggle {
    padding: 8px 16px;
    border-radius: 20px;
    border: 1px solid var(--text-color);
    background: transparent;
    color: var(--text-color);
    cursor: pointer;
    font-weight: bold;
}