/* File: stock-calculator.css */
body.dark-theme {
    --bg-color: #1a1d21; --surface-color: #2c2f33; --surface-alt-color: #1f2937;
    --primary-text: #e0e0e0; --secondary-text: #a9a9a9; --border-color: #4f545c;
    --accent-color: #818cf8; --accent-color-text: #ffffff;
    --success-text: #4ade80; --error-text: #f87171; --info-text: #60a5fa;
}
body.light-theme {
    --bg-color: #f1f5f9; --surface-color: #ffffff; --surface-alt-color: #f8fafc;
    --primary-text: #1e293b; --secondary-text: #64748b; --border-color: #e2e8f0;
    --accent-color: #4f46e5; --accent-color-text: #ffffff;
    --success-text: #16a34a; --error-text: #dc2626; --info-text: #2563eb;
}
body {
    margin: 0; font-family: 'Sarabun', 'Kanit', sans-serif; background-color: var(--bg-color);
    color: var(--primary-text); display: flex; justify-content: center; align-items: center;
    min-height: 100vh; padding: 1rem; box-sizing: border-box; transition: background-color 0.3s, color 0.3s;
}
#theme-toggle {
    position: fixed; top: 20px; right: 20px; background: var(--surface-color); border: 1px solid var(--border-color);
    color: var(--primary-text); width: 40px; height: 40px; border-radius: 50%;
    cursor: pointer; font-size: 18px; display: flex; justify-content: center;
    align-items: center; z-index: 1000; transition: all 0.3s;
}
#theme-toggle:hover { transform: scale(1.1); }
.container { width: 100%; max-width: 42rem; margin: 2rem auto; }
.main-card {
    background-color: var(--surface-color); border-radius: 1rem;
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1); padding: 1.5rem;
    border: 1px solid var(--border-color); display: flex; flex-direction: column; gap: 1.5rem;
}
@media (min-width: 768px) { .main-card { padding: 2rem; } }
body.dark-theme .main-card { box-shadow: 0 10px 15px -3px rgba(0,0,0,0.2); }
.page-header { text-align: center; }
.page-header h1 { font-size: 1.5rem; font-weight: 700; color: var(--accent-color); margin: 0; }
.page-header h1:first-of-type { font-size: 1.25rem; color: var(--primary-text); }
.page-header p { color: var(--secondary-text); margin-top: 0.5rem; font-size: 0.875rem; }
.input-form { display: flex; flex-direction: column; gap: 1rem; }
.form-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}
@media (min-width: 640px) {
    .form-grid {
        grid-template-columns: 1fr 1fr;
    }
}
.form-group label { display: block; font-weight: 500; margin-bottom: 0.5rem; color: var(--secondary-text); font-size: 0.875rem; }
.form-group input {
    width: 100%; padding: 0.75rem 1rem; font-size: 1rem; border: 1px solid var(--border-color);
    background-color: var(--surface-alt-color); color: var(--primary-text); border-radius: 0.5rem;
    transition: all 0.2s; box-sizing: border-box;
}
.form-group input:focus {
    outline: none; border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.4);
}
.button-wrapper {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
}
.btn-primary, .btn-secondary {
    flex-grow: 1;
    font-weight: 700; padding: 0.75rem 1rem; border-radius: 0.5rem; border: 1px solid;
    cursor: pointer; transition: all 0.2s; display: flex; align-items: center; justify-content: center; gap: 0.5rem;
    font-size: 1rem;
}
.btn-primary { background-color: var(--accent-color); color: var(--accent-color-text); border-color: var(--accent-color); }
.btn-primary:hover { opacity: 0.9; transform: translateY(-2px); }
.btn-secondary { background-color: transparent; color: var(--secondary-text); border-color: var(--secondary-text); }
.btn-secondary:hover { background-color: var(--surface-alt-color); color: var(--primary-text); border-color: var(--primary-text); }

.result-wrapper { display: flex; flex-direction: column; gap: 1.5rem; margin-top: 1rem; }
.result-box { padding: 1.25rem; border-left-width: 4px; border-radius: 0 0.5rem 0.5rem 0; }
.result-box.success { background-color: rgba(34, 197, 94, 0.05); border-color: var(--success-text); }
.result-box.error { background-color: rgba(239, 68, 68, 0.05); border-color: var(--error-text); }
.result-box.info { background-color: rgba(59, 130, 246, 0.05); border-color: var(--info-text); }
.result-box.error p { color: var(--error-text) !important; }
.result-box.info p { color: var(--info-text) !important; }
.result-box h3 { font-size: 1.125rem; font-weight: 700; margin: 0 0 0.75rem 0; color: var(--primary-text); }
.result-box.success h3 { color: var(--success-text); }
.result-box .highlight-text { font-size: 2.25rem; font-weight: 700; text-align: center; display: block; margin: 1rem 0; color: var(--success-text); }
.result-box .summary-text { font-size: 0.875rem; color: var(--secondary-text); }
.explanation-steps { display: flex; flex-direction: column; gap: 1.5rem; margin-top: 1rem; }
.step-title { font-weight: 700; color: var(--primary-text); font-size: 1rem;}
.step-description { font-size: 0.875rem; color: var(--secondary-text); margin-top: 0.25rem; }
.formula-box {
    background-color: var(--surface-alt-color); padding: 0.75rem; border-radius: 0.25rem;
    margin-top: 0.5rem; font-family: monospace; display: flex; flex-direction: column;
    gap: 0.5rem; font-size: 0.875rem; word-break: break-all;
}
.example-list {
    list-style: none; padding-left: 1rem; margin-top: 0.75rem;
    border-left: 2px solid var(--border-color);
    display: flex; flex-direction: column; gap: 0.5rem;
}
.example-list li { font-size: 0.875rem; color: var(--secondary-text); }
.text-accent { font-weight: 700; color: var(--accent-color); }
.text-success { font-weight: 700; color: var(--success-text); }
.footer-link { text-align: center; }
.footer-link a { color: var(--secondary-text); text-decoration: none; font-size: 0.875rem; }
.footer-link a:hover { text-decoration: underline; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }
.fade-in { animation: fadeIn 0.5s ease-out forwards; }